| /* |
| * Kernel-based Virtual Machine driver for Linux |
| * |
| * derived from drivers/kvm/kvm_main.c |
| * |
| * Copyright (C) 2006 Qumranet, Inc. |
| * Copyright (C) 2008 Qumranet, Inc. |
| * Copyright IBM Corporation, 2008 |
| * Copyright 2010 Red Hat, Inc. and/or its affiliates. |
| * |
| * Authors: |
| * Avi Kivity <avi@qumranet.com> |
| * Yaniv Kamay <yaniv@qumranet.com> |
| * Amit Shah <amit.shah@qumranet.com> |
| * Ben-Ami Yassour <benami@il.ibm.com> |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2. See |
| * the COPYING file in the top-level directory. |
| * |
| */ |
| |
| #include <linux/kvm_host.h> |
| #include "irq.h" |
| #include "mmu.h" |
| #include "i8254.h" |
| #include "tss.h" |
| #include "kvm_cache_regs.h" |
| #include "x86.h" |
| |
| #include <linux/clocksource.h> |
| #include <linux/interrupt.h> |
| #include <linux/kvm.h> |
| #include <linux/fs.h> |
| #include <linux/vmalloc.h> |
| #include <linux/module.h> |
| #include <linux/mman.h> |
| #include <linux/highmem.h> |
| #include <linux/iommu.h> |
| #include <linux/intel-iommu.h> |
| #include <linux/cpufreq.h> |
| #include <linux/user-return-notifier.h> |
| #include <linux/srcu.h> |
| #include <linux/slab.h> |
| #include <linux/perf_event.h> |
| #include <linux/uaccess.h> |
| #include <linux/hash.h> |
| #include <linux/pci.h> |
| #include <trace/events/kvm.h> |
| |
| #define CREATE_TRACE_POINTS |
| #include "trace.h" |
| |
| #include <asm/debugreg.h> |
| #include <asm/msr.h> |
| #include <asm/desc.h> |
| #include <asm/mtrr.h> |
| #include <asm/mce.h> |
| #include <asm/i387.h> |
| #include <asm/xcr.h> |
| #include <asm/pvclock.h> |
| #include <asm/div64.h> |
| |
| #define MAX_IO_MSRS 256 |
| #define KVM_MAX_MCE_BANKS 32 |
| #define KVM_MCE_CAP_SUPPORTED (MCG_CTL_P | MCG_SER_P) |
| |
| #define emul_to_vcpu(ctxt) \ |
| container_of(ctxt, struct kvm_vcpu, arch.emulate_ctxt) |
| |
| /* EFER defaults: |
| * - enable syscall per default because its emulated by KVM |
| * - enable LME and LMA per default on 64 bit KVM |
| */ |
| #ifdef CONFIG_X86_64 |
| static |
| u64 __read_mostly efer_reserved_bits = ~((u64)(EFER_SCE | EFER_LME | EFER_LMA)); |
| #else |
| static u64 __read_mostly efer_reserved_bits = ~((u64)EFER_SCE); |
| #endif |
| |
| #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM |
| #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU |
| |
| static void update_cr8_intercept(struct kvm_vcpu *vcpu); |
| static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid, |
| struct kvm_cpuid_entry2 __user *entries); |
| static void process_nmi(struct kvm_vcpu *vcpu); |
| |
| struct kvm_x86_ops *kvm_x86_ops; |
| EXPORT_SYMBOL_GPL(kvm_x86_ops); |
| |
| int ignore_msrs = 0; |
| module_param_named(ignore_msrs, ignore_msrs, bool, S_IRUGO | S_IWUSR); |
| |
| bool kvm_has_tsc_control; |
| EXPORT_SYMBOL_GPL(kvm_has_tsc_control); |
| u32 kvm_max_guest_tsc_khz; |
| EXPORT_SYMBOL_GPL(kvm_max_guest_tsc_khz); |
| |
| #define KVM_NR_SHARED_MSRS 16 |
| |
| struct kvm_shared_msrs_global { |
| int nr; |
| u32 msrs[KVM_NR_SHARED_MSRS]; |
| }; |
| |
| struct kvm_shared_msrs { |
| struct user_return_notifier urn; |
| bool registered; |
| struct kvm_shared_msr_values { |
| u64 host; |
| u64 curr; |
| } values[KVM_NR_SHARED_MSRS]; |
| }; |
| |
| static struct kvm_shared_msrs_global __read_mostly shared_msrs_global; |
| static DEFINE_PER_CPU(struct kvm_shared_msrs, shared_msrs); |
| |
| struct kvm_stats_debugfs_item debugfs_entries[] = { |
| { "pf_fixed", VCPU_STAT(pf_fixed) }, |
| { "pf_guest", VCPU_STAT(pf_guest) }, |
| { "tlb_flush", VCPU_STAT(tlb_flush) }, |
| { "invlpg", VCPU_STAT(invlpg) }, |
| { "exits", VCPU_STAT(exits) }, |
| { "io_exits", VCPU_STAT(io_exits) }, |
| { "mmio_exits", VCPU_STAT(mmio_exits) }, |
| { "signal_exits", VCPU_STAT(signal_exits) }, |
| { "irq_window", VCPU_STAT(irq_window_exits) }, |
| { "nmi_window", VCPU_STAT(nmi_window_exits) }, |
| { "halt_exits", VCPU_STAT(halt_exits) }, |
| { "halt_wakeup", VCPU_STAT(halt_wakeup) }, |
| { "hypercalls", VCPU_STAT(hypercalls) }, |
| { "request_irq", VCPU_STAT(request_irq_exits) }, |
| { "irq_exits", VCPU_STAT(irq_exits) }, |
| { "host_state_reload", VCPU_STAT(host_state_reload) }, |
| { "efer_reload", VCPU_STAT(efer_reload) }, |
| { "fpu_reload", VCPU_STAT(fpu_reload) }, |
| { "insn_emulation", VCPU_STAT(insn_emulation) }, |
| { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) }, |
| { "irq_injections", VCPU_STAT(irq_injections) }, |
| { "nmi_injections", VCPU_STAT(nmi_injections) }, |
| { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) }, |
| { "mmu_pte_write", VM_STAT(mmu_pte_write) }, |
| { "mmu_pte_updated", VM_STAT(mmu_pte_updated) }, |
| { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) }, |
| { "mmu_flooded", VM_STAT(mmu_flooded) }, |
| { "mmu_recycled", VM_STAT(mmu_recycled) }, |
| { "mmu_cache_miss", VM_STAT(mmu_cache_miss) }, |
| { "mmu_unsync", VM_STAT(mmu_unsync) }, |
| { "remote_tlb_flush", VM_STAT(remote_tlb_flush) }, |
| { "largepages", VM_STAT(lpages) }, |
| { NULL } |
| }; |
| |
| u64 __read_mostly host_xcr0; |
| |
| int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt); |
| |
| static inline void kvm_async_pf_hash_reset(struct kvm_vcpu *vcpu) |
| { |
| int i; |
| for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU); i++) |
| vcpu->arch.apf.gfns[i] = ~0; |
| } |
| |
| static void kvm_on_user_return(struct user_return_notifier *urn) |
| { |
| unsigned slot; |
| struct kvm_shared_msrs *locals |
| = container_of(urn, struct kvm_shared_msrs, urn); |
| struct kvm_shared_msr_values *values; |
| |
| for (slot = 0; slot < shared_msrs_global.nr; ++slot) { |
| values = &locals->values[slot]; |
| if (values->host != values->curr) { |
| wrmsrl(shared_msrs_global.msrs[slot], values->host); |
| values->curr = values->host; |
| } |
| } |
| locals->registered = false; |
| user_return_notifier_unregister(urn); |
| } |
| |
| static void shared_msr_update(unsigned slot, u32 msr) |
| { |
| struct kvm_shared_msrs *smsr; |
| u64 value; |
| |
| smsr = &__get_cpu_var(shared_msrs); |
| /* only read, and nobody should modify it at this time, |
| * so don't need lock */ |
| if (slot >= shared_msrs_global.nr) { |
| printk(KERN_ERR "kvm: invalid MSR slot!"); |
| return; |
| } |
| rdmsrl_safe(msr, &value); |
| smsr->values[slot].host = value; |
| smsr->values[slot].curr = value; |
| } |
| |
| void kvm_define_shared_msr(unsigned slot, u32 msr) |
| { |
| if (slot >= shared_msrs_global.nr) |
| shared_msrs_global.nr = slot + 1; |
| shared_msrs_global.msrs[slot] = msr; |
| /* we need ensured the shared_msr_global have been updated */ |
| smp_wmb(); |
| } |
| EXPORT_SYMBOL_GPL(kvm_define_shared_msr); |
| |
| static void kvm_shared_msr_cpu_online(void) |
| { |
| unsigned i; |
| |
| for (i = 0; i < shared_msrs_global.nr; ++i) |
| shared_msr_update(i, shared_msrs_global.msrs[i]); |
| } |
| |
| void kvm_set_shared_msr(unsigned slot, u64 value, u64 mask) |
| { |
| struct kvm_shared_msrs *smsr = &__get_cpu_var(shared_msrs); |
| |
| if (((value ^ smsr->values[slot].curr) & mask) == 0) |
| return; |
| smsr->values[slot].curr = value; |
| wrmsrl(shared_msrs_global.msrs[slot], value); |
| if (!smsr->registered) { |
| smsr->urn.on_user_return = kvm_on_user_return; |
| user_return_notifier_register(&smsr->urn); |
| smsr->registered = true; |
| } |
| } |
| EXPORT_SYMBOL_GPL(kvm_set_shared_msr); |
| |
| static void drop_user_return_notifiers(void *ignore) |
| { |
| struct kvm_shared_msrs *smsr = &__get_cpu_var(shared_msrs); |
| |
| if (smsr->registered) |
| kvm_on_user_return(&smsr->urn); |
| } |
| |
| u64 kvm_get_apic_base(struct kvm_vcpu *vcpu) |
| { |
| if (irqchip_in_kernel(vcpu->kvm)) |
| return vcpu->arch.apic_base; |
| else |
| return vcpu->arch.apic_base; |
| } |
| EXPORT_SYMBOL_GPL(kvm_get_apic_base); |
| |
| void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data) |
| { |
| /* TODO: reserve bits check */ |
| if (irqchip_in_kernel(vcpu->kvm)) |
| kvm_lapic_set_base(vcpu, data); |
| else |
| vcpu->arch.apic_base = data; |
| } |
| EXPORT_SYMBOL_GPL(kvm_set_apic_base); |
| |
| #define EXCPT_BENIGN 0 |
| #define EXCPT_CONTRIBUTORY 1 |
| #define EXCPT_PF 2 |
| |
| static int exception_class(int vector) |
| { |
| switch (vector) { |
| case PF_VECTOR: |
| return EXCPT_PF; |
| case DE_VECTOR: |
| case TS_VECTOR: |
| case NP_VECTOR: |
| case SS_VECTOR: |
| case GP_VECTOR: |
| return EXCPT_CONTRIBUTORY; |
| default: |
| break; |
| } |
| return EXCPT_BENIGN; |
| } |
| |
| static void kvm_multiple_exception(struct kvm_vcpu *vcpu, |
| unsigned nr, bool has_error, u32 error_code, |
| bool reinject) |
| { |
| u32 prev_nr; |
| int class1, class2; |
| |
| kvm_make_request(KVM_REQ_EVENT, vcpu); |
| |
| if (!vcpu->arch.exception.pending) { |
| queue: |
| vcpu->arch.exception.pending = true; |
| vcpu->arch.exception.has_error_code = has_error; |
| vcpu->arch.exception.nr = nr; |
| vcpu->arch.exception.error_code = error_code; |
| vcpu->arch.exception.reinject = reinject; |
| return; |
| } |
| |
| /* to check exception */ |
| prev_nr = vcpu->arch.exception.nr; |
| if (prev_nr == DF_VECTOR) { |
| /* triple fault -> shutdown */ |
| kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); |
| return; |
| } |
| class1 = exception_class(prev_nr); |
| class2 = exception_class(nr); |
| if ((class1 == EXCPT_CONTRIBUTORY && class2 == EXCPT_CONTRIBUTORY) |
| || (class1 == EXCPT_PF && class2 != EXCPT_BENIGN)) { |
| /* generate double fault per SDM Table 5-5 */ |
| vcpu->arch.exception.pending = true; |
| vcpu->arch.exception.has_error_code = true; |
| vcpu->arch.exception.nr = DF_VECTOR; |
| vcpu->arch.exception.error_code = 0; |
| } else |
| /* replace previous exception with a new one in a hope |
| that instruction re-execution will regenerate lost |
| exception */ |
| goto queue; |
| } |
| |
| void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr) |
| { |
| kvm_multiple_exception(vcpu, nr, false, 0, false); |
| } |
| EXPORT_SYMBOL_GPL(kvm_queue_exception); |
| |
| void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr) |
| { |
| kvm_multiple_exception(vcpu, nr, false, 0, true); |
| } |
| EXPORT_SYMBOL_GPL(kvm_requeue_exception); |
| |
| void kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err) |
| { |
| if (err) |
| kvm_inject_gp(vcpu, 0); |
| else |
| kvm_x86_ops->skip_emulated_instruction(vcpu); |
| } |
| EXPORT_SYMBOL_GPL(kvm_complete_insn_gp); |
| |
| void kvm_inject_page_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault) |
| { |
| ++vcpu->stat.pf_guest; |
| vcpu->arch.cr2 = fault->address; |
| kvm_queue_exception_e(vcpu, PF_VECTOR, fault->error_code); |
| } |
| EXPORT_SYMBOL_GPL(kvm_inject_page_fault); |
| |
| void kvm_propagate_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault) |
| { |
| if (mmu_is_nested(vcpu) && !fault->nested_page_fault) |
| vcpu->arch.nested_mmu.inject_page_fault(vcpu, fault); |
| else |
| vcpu->arch.mmu.inject_page_fault(vcpu, fault); |
| } |
| |
| void kvm_inject_nmi(struct kvm_vcpu *vcpu) |
| { |
| atomic_inc(&vcpu->arch.nmi_queued); |
| kvm_make_request(KVM_REQ_NMI, vcpu); |
| } |
| EXPORT_SYMBOL_GPL(kvm_inject_nmi); |
| |
| void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code) |
| { |
| kvm_multiple_exception(vcpu, nr, true, error_code, false); |
| } |
| EXPORT_SYMBOL_GPL(kvm_queue_exception_e); |
| |
| void kvm_requeue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code) |
| { |
| kvm_multiple_exception(vcpu, nr, true, error_code, true); |
| } |
| EXPORT_SYMBOL_GPL(kvm_requeue_exception_e); |
| |
| /* |
| * Checks if cpl <= required_cpl; if true, return true. Otherwise queue |
| * a #GP and return false. |
| */ |
| bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl) |
| { |
| if (kvm_x86_ops->get_cpl(vcpu) <= required_cpl) |
| return true; |
| kvm_queue_exception_e(vcpu, GP_VECTOR, 0); |
| return false; |
| } |
| EXPORT_SYMBOL_GPL(kvm_require_cpl); |
| |
| /* |
| * This function will be used to read from the physical memory of the currently |
| * running guest. The difference to kvm_read_guest_page is that this function |
| * can read from guest physical or from the guest's guest physical memory. |
| */ |
| int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, |
| gfn_t ngfn, void *data, int offset, int len, |
| u32 access) |
| { |
| gfn_t real_gfn; |
| gpa_t ngpa; |
| |
| ngpa = gfn_to_gpa(ngfn); |
| real_gfn = mmu->translate_gpa(vcpu, ngpa, access); |
| if (real_gfn == UNMAPPED_GVA) |
| return -EFAULT; |
| |
| real_gfn = gpa_to_gfn(real_gfn); |
| |
| return kvm_read_guest_page(vcpu->kvm, real_gfn, data, offset, len); |
| } |
| EXPORT_SYMBOL_GPL(kvm_read_guest_page_mmu); |
| |
| int kvm_read_nested_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, |
| void *data, int offset, int len, u32 access) |
| { |
| return kvm_read_guest_page_mmu(vcpu, vcpu->arch.walk_mmu, gfn, |
| data, offset, len, access); |
| } |
| |
| /* |
| * Load the pae pdptrs. Return true is they are all valid. |
| */ |
| int load_pdptrs(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, unsigned long cr3) |
| { |
| gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT; |
| unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2; |
| int i; |
| int ret; |
| u64 pdpte[ARRAY_SIZE(mmu->pdptrs)]; |
| |
| ret = kvm_read_guest_page_mmu(vcpu, mmu, pdpt_gfn, pdpte, |
| offset * sizeof(u64), sizeof(pdpte), |
| PFERR_USER_MASK|PFERR_WRITE_MASK); |
| if (ret < 0) { |
| ret = 0; |
| goto out; |
| } |
| for (i = 0; i < ARRAY_SIZE(pdpte); ++i) { |
| if (is_present_gpte(pdpte[i]) && |
| (pdpte[i] & vcpu->arch.mmu.rsvd_bits_mask[0][2])) { |
| ret = 0; |
| goto out; |
| } |
| } |
| ret = 1; |
| |
| memcpy(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs)); |
| __set_bit(VCPU_EXREG_PDPTR, |
| (unsigned long *)&vcpu->arch.regs_avail); |
| __set_bit(VCPU_EXREG_PDPTR, |
| (unsigned long *)&vcpu->arch.regs_dirty); |
| out: |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(load_pdptrs); |
| |
| static bool pdptrs_changed(struct kvm_vcpu *vcpu) |
| { |
| u64 pdpte[ARRAY_SIZE(vcpu->arch.walk_mmu->pdptrs)]; |
| bool changed = true; |
| int offset; |
| gfn_t gfn; |
| int r; |
| |
| if (is_long_mode(vcpu) || !is_pae(vcpu)) |
| return false; |
| |
| if (!test_bit(VCPU_EXREG_PDPTR, |
| (unsigned long *)&vcpu->arch.regs_avail)) |
| return true; |
| |
| gfn = (kvm_read_cr3(vcpu) & ~31u) >> PAGE_SHIFT; |
| offset = (kvm_read_cr3(vcpu) & ~31u) & (PAGE_SIZE - 1); |
| r = kvm_read_nested_guest_page(vcpu, gfn, pdpte, offset, sizeof(pdpte), |
| PFERR_USER_MASK | PFERR_WRITE_MASK); |
| if (r < 0) |
| goto out; |
| changed = memcmp(pdpte, vcpu->arch.walk_mmu->pdptrs, sizeof(pdpte)) != 0; |
| out: |
| |
| return changed; |
| } |
| |
| int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) |
| { |
| unsigned long old_cr0 = kvm_read_cr0(vcpu); |
| unsigned long update_bits = X86_CR0_PG | X86_CR0_WP | |
| X86_CR0_CD | X86_CR0_NW; |
| |
| cr0 |= X86_CR0_ET; |
| |
| #ifdef CONFIG_X86_64 |
| if (cr0 & 0xffffffff00000000UL) |
| return 1; |
| #endif |
| |
| cr0 &= ~CR0_RESERVED_BITS; |
| |
| if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) |
| return 1; |
| |
| if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) |
| return 1; |
| |
| if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) { |
| #ifdef CONFIG_X86_64 |
| if ((vcpu->arch.efer & EFER_LME)) { |
| int cs_db, cs_l; |
| |
| if (!is_pae(vcpu)) |
| return 1; |
| kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); |
| if (cs_l) |
| return 1; |
| } else |
| #endif |
| if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.walk_mmu, |
| kvm_read_cr3(vcpu))) |
| return 1; |
| } |
| |
| kvm_x86_ops->set_cr0(vcpu, cr0); |
| |
| if ((cr0 ^ old_cr0) & X86_CR0_PG) { |
| kvm_clear_async_pf_completion_queue(vcpu); |
| kvm_async_pf_hash_reset(vcpu); |
| } |
| |
| if ((cr0 ^ old_cr0) & update_bits) |
| kvm_mmu_reset_context(vcpu); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(kvm_set_cr0); |
| |
| void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw) |
| { |
| (void)kvm_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~0x0eul) | (msw & 0x0f)); |
| } |
| EXPORT_SYMBOL_GPL(kvm_lmsw); |
| |
| int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr) |
| { |
| u64 xcr0; |
| |
| /* Only support XCR_XFEATURE_ENABLED_MASK(xcr0) now */ |
| if (index != XCR_XFEATURE_ENABLED_MASK) |
| return 1; |
| xcr0 = xcr; |
| if (kvm_x86_ops->get_cpl(vcpu) != 0) |
| return 1; |
| if (!(xcr0 & XSTATE_FP)) |
| return 1; |
| if ((xcr0 & XSTATE_YMM) && !(xcr0 & XSTATE_SSE)) |
| return 1; |
| if (xcr0 & ~host_xcr0) |
| return 1; |
| vcpu->arch.xcr0 = xcr0; |
| vcpu->guest_xcr0_loaded = 0; |
| return 0; |
| } |
| |
| int kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr) |
| { |
| if (__kvm_set_xcr(vcpu, index, xcr)) { |
| kvm_inject_gp(vcpu, 0); |
| return 1; |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(kvm_set_xcr); |
| |
| static bool guest_cpuid_has_xsave(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_cpuid_entry2 *best; |
| |
| best = kvm_find_cpuid_entry(vcpu, 1, 0); |
| return best && (best->ecx & bit(X86_FEATURE_XSAVE)); |
| } |
| |
| static bool guest_cpuid_has_smep(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_cpuid_entry2 *best; |
| |
| best = kvm_find_cpuid_entry(vcpu, 7, 0); |
| return best && (best->ebx & bit(X86_FEATURE_SMEP)); |
| } |
| |
| static bool guest_cpuid_has_fsgsbase(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_cpuid_entry2 *best; |
| |
| best = kvm_find_cpuid_entry(vcpu, 7, 0); |
| return best && (best->ebx & bit(X86_FEATURE_FSGSBASE)); |
| } |
| |
| static void update_cpuid(struct kvm_vcpu *vcpu) |
| { |
| struct kvm_cpuid_entry2 *best; |
| struct kvm_lapic *apic = vcpu->arch.apic; |
| |
| best = kvm_find_cpuid_entry(vcpu, 1, 0); |
| if (!best) |
| return; |
| |
| /* Update OSXSAVE bit */ |
| if (cpu_has_xsave && best->function == 0x1) { |
| best->ecx &= ~(bit(X86_FEATURE_OSXSAVE)); |
| if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE)) |
| best->ecx |= bit(X86_FEATURE_OSXSAVE); |
| } |
| |
| if (apic) { |
| if (best->ecx & bit(X86_FEATURE_TSC_DEADLINE_TIMER)) |
| apic->lapic_timer.timer_mode_mask = 3 << 17; |
| else |
| apic->lapic_timer.timer_mode_mask = 1 << 17; |
| } |
| } |
| |
| int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) |
| { |
| unsigned long old_cr4 = kvm_read_cr4(vcpu); |
| unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE | |
| X86_CR4_PAE | X86_CR4_SMEP; |
| if (cr4 & CR4_RESERVED_BITS) |
| return 1; |
| |
| if (!guest_cpuid_has_xsave(vcpu) && (cr4 & X86_CR4_OSXSAVE)) |
| return 1; |
| |
| if (!guest_cpuid_has_smep(vcpu) && (cr4 & X86_CR4_SMEP)) |
| return 1; |
| |
| if (!guest_cpuid_has_fsgsbase(vcpu) && (cr4 & X86_CR4_RDWRGSFS)) |
| return 1; |
| |
| if (is_long_mode(vcpu)) { |
| if (!(cr4 & X86_CR4_PAE)) |
| return 1; |
| } else if (is_paging(vcpu) && (cr4 & X86_CR4_PAE) |
| && ((cr4 ^ old_cr4) & pdptr_bits) |
| && !load_pdptrs(vcpu, vcpu->arch.walk_mmu, |
| kvm_read_cr3(vcpu))) |
| return 1; |
| |
| if (kvm_x86_ops->set_cr4(vcpu, cr4)) |
| return 1; |
| |
| if ((cr4 ^ old_cr4) & pdptr_bits) |
| kvm_mmu_reset_context(vcpu); |
| |
| if ((cr4 ^ old_cr4) & X86_CR4_OSXSAVE) |
| update_cpuid(vcpu); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(kvm_set_cr4); |
| |
| int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) |
| { |
| if (cr3 == kvm_read_cr3(vcpu) && !pdptrs_changed(vcpu)) { |
| kvm_mmu_sync_roots(vcpu); |
| kvm_mmu_flush_tlb(vcpu); |
| return 0; |
| } |
| |
| if (is_long_mode(vcpu)) { |
| if (cr3 & CR3_L_MODE_RESERVED_BITS) |
| return 1; |
| } else { |
| if (is_pae(vcpu)) { |
| if (cr3 & CR3_PAE_RESERVED_BITS) |
| return 1; |
| if (is_paging(vcpu) && |
| !load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3)) |
| return 1; |
| } |
| /* |
| * We don't check reserved bits in nonpae mode, because |
| * this isn't enforced, and VMware depends on this. |
| */ |
| } |
| |
| /* |
| * Does the new cr3 value map to physical memory? (Note, we |
| * catch an invalid cr3 even in real-mode, because it would |
| * cause trouble later on when we turn on paging anyway.) |
| * |
| * A real CPU would silently accept an invalid cr3 and would |
| * attempt to use it - with largely undefined (and often hard |
| * to debug) behavior on the guest side. |
| */ |
| if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT))) |
| return 1; |
| vcpu->arch.cr3 = cr3; |
| __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail); |
| vcpu->arch.mmu.new_cr3(vcpu); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(kvm_set_cr3); |
| |
| int kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8) |
| { |
| if (cr8 & CR8_RESERVED_BITS) |
| return 1; |
| if (irqchip_in_kernel(vcpu->kvm)) |
| kvm_lapic_set_tpr(vcpu, cr8); |
| else |
| vcpu->arch.cr8 = cr8; |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(kvm_set_cr8); |
| |
| unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu) |
| { |
| if (irqchip_in_kernel(vcpu->kvm)) |
| return kvm_lapic_get_cr8(vcpu); |
| else |
| return vcpu->arch.cr8; |
| } |
| EXPORT_SYMBOL_GPL(kvm_get_cr8); |
| |
| static int __kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val) |
| { |
| switch (dr) { |
| case 0 ... 3: |
| vcpu->arch.db[dr] = val; |
| if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) |
| vcpu->arch.eff_db[dr] = val; |
| break; |
| case 4: |
| if (kvm_read_cr4_bits(vcpu, X86_CR4_DE)) |
| return 1; /* #UD */ |
| /* fall through */ |
| case 6: |
| if (val & 0xffffffff00000000ULL) |
| return -1; /* #GP */ |
| vcpu->arch.dr6 = (val & DR6_VOLATILE) | DR6_FIXED_1; |
| break; |
| case 5: |
| if (kvm_read_cr4_bits(vcpu, X86_CR4_DE)) |
| return 1; /* #UD */ |
| /* fall through */ |
| default: /* 7 */ |
| if (val & 0xffffffff00000000ULL) |
| return -1; /* #GP */ |
| vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1; |
| if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) { |
| kvm_x86_ops->set_dr7(vcpu, vcpu->arch.dr7); |
| vcpu->arch.switch_db_regs = (val & DR7_BP_EN_MASK); |
| } |
| break; |
| } |
| |
| return 0; |
| } |
| |
| int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val) |
| { |
| int res; |
| |
| res = __kvm_set_dr(vcpu, dr, val); |
| if (res > 0) |
| kvm_queue_exception(vcpu, UD_VECTOR); |
| else if (res < 0) |
| kvm_inject_gp(vcpu, 0); |
| |
| return res; |
| } |
| EXPORT_SYMBOL_GPL(kvm_set_dr); |
| |
| static int _kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val) |
| { |
| switch (dr) { |
| case 0 ... 3: |
| *val = vcpu->arch.db[dr]; |
| break; |
| case 4: |
| if (kvm_read_cr4_bits(vcpu, X86_CR4_DE)) |
| return 1; |
| /* fall through */ |
| case 6: |
| *val = vcpu->arch.dr6; |
| break; |
| case 5: |
| if (kvm_read_cr4_bits(vcpu, X86_CR4_DE)) |
| return 1; |
| /* fall through */ |
| default: /* 7 */ |
| *val = vcpu->arch.dr7; |
| break; |
| } |
| |
| return 0; |
| } |
| |
| int kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val) |
| { |
| if (_kvm_get_dr(vcpu, dr, val)) { |
| kvm_queue_exception(vcpu, UD_VECTOR); |
| return 1; |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(kvm_get_dr); |
| |
| /* |
| * List of msr numbers which we expose to userspace through KVM_GET_MSRS |
| * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST. |
| * |
| * This list is modified at module load time to reflect the |
| * capabilities of the host cpu. This capabilities test skips MSRs that are |
| * kvm-specific. Those are put in the beginning of the list. |
| */ |
| |
| #define KVM_SAVE_MSRS_BEGIN 9 |
| static u32 msrs_to_save[] = { |
| MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK, |
| MSR_KVM_SYSTEM_TIME_NEW, MSR_KVM_WALL_CLOCK_NEW, |
| HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL, |
| HV_X64_MSR_APIC_ASSIST_PAGE, MSR_KVM_ASYNC_PF_EN, MSR_KVM_STEAL_TIME, |
| MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP, |
| MSR_STAR, |
| #ifdef CONFIG_X86_64 |
| MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR, |
| #endif |
| MSR_IA32_TSC, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA |
| }; |
| |
| static unsigned num_msrs_to_save; |
| |
| static u32 emulated_msrs[] = { |
| MSR_IA32_TSCDEADLINE, |
| MSR_IA32_MISC_ENABLE, |
| MSR_IA32_MCG_STATUS, |
| MSR_IA32_MCG_CTL, |
| }; |
| |
| static int set_efer(struct kvm_vcpu *vcpu, u64 efer) |
| { |
| u64 old_efer = vcpu->arch.efer; |
| |
| if (efer & efer_reserved_bits) |
| return 1; |
| |
| if (is_paging(vcpu) |
| && (vcpu->arch.efer & EFER_LME) != (efer & EFER_LME)) |
| return 1; |
| |
| if (efer & EFER_FFXSR) { |
| struct kvm_cpuid_entry2 *feat; |
| |
| feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0); |
| if (!feat || !(feat->edx & bit(X86_FEATURE_FXSR_OPT))) |
| return 1; |
| } |
| |
| if (efer & EFER_SVME) { |
| struct kvm_cpuid_entry2 *feat; |
| |
| feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0); |
| if (!feat || !(feat->ecx & bit(X86_FEATURE_SVM))) |
| return 1; |
| } |
| |
| efer &= ~EFER_LMA; |
| efer |= vcpu->arch.efer & EFER_LMA; |
| |
| kvm_x86_ops->set_efer(vcpu, efer); |
| |
| vcpu->arch.mmu.base_role.nxe = (efer & EFER_NX) && !tdp_enabled; |
| |
| /* Update reserved bits */ |
| if ((efer ^ old_efer) & EFER_NX) |
| kvm_mmu_reset_context(vcpu); |
| |
| return 0; |
| } |
| |
| void kvm_enable_efer_bits(u64 mask) |
| { |
| efer_reserved_bits &= ~mask; |
| } |
| EXPORT_SYMBOL_GPL(kvm_enable_efer_bits); |
| |
| |
| /* |
| * Writes msr value into into the appropriate "register". |
| * Returns 0 on success, non-0 otherwise. |
| * Assumes vcpu_load() was already called. |
| */ |
| int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) |
| { |
| return kvm_x86_ops->set_msr(vcpu, msr_index, data); |
| } |
| |
| /* |
| * Adapt set_msr() to msr_io()'s calling convention |
| */ |
| static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data) |
| { |
| return kvm_set_msr(vcpu, index, *data); |
| } |
| |
| static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock) |
| { |
| int version; |
| int r; |
| struct pvclock_wall_clock wc; |
| struct timespec boot; |
| |
| if (!wall_clock) |
| return; |
| |
| r = kvm_read_guest(kvm, wall_clock, &version, sizeof(version)); |
| if (r) |
| return; |
| |
| if (version & 1) |
| ++version; /* first time write, random junk */ |
| |
| ++version; |
| |
| kvm_write_guest(kvm, wall_clock, &version, sizeof(version)); |
| |
| /* |
| * The guest calculates current wall clock time by adding |
| * system time (updated by kvm_guest_time_update below) to the |
| * wall clock specified here. guest system time equals host |
| * system time for us, thus we must fill in host boot time here. |
| */ |
| getboottime(&boot); |
| |
| wc.sec = boot.tv_sec; |
| wc.nsec = boot.tv_nsec; |
| wc.version = version; |
| |
| kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc)); |
| |
| version++; |
| kvm_write_guest(kvm, wall_clock, &version, sizeof(version)); |
| } |
| |
| static uint32_t div_frac(uint32_t dividend, uint32_t divisor) |
| { |
| uint32_t quotient, remainder; |
| |
| /* Don't try to replace with do_div(), this one calculates |
| * "(dividend << 32) / divisor" */ |
| __asm__ ( "divl %4" |
| : "=a" (quotient), "=d" (remainder) |
| : "0" (0), "1" (dividend), "r" (divisor) ); |
| return quotient; |
| } |
| |
| static void kvm_get_time_scale(uint32_t scaled_khz, uint32_t base_khz, |
| s8 *pshift, u32 *pmultiplier) |
| { |
| uint64_t scaled64; |
| int32_t shift = 0; |
| uint64_t tps64; |
| uint32_t tps32; |
| |
| tps64 = base_khz * 1000LL; |
| scaled64 = scaled_khz * 1000LL; |
| while (tps64 > scaled64*2 || tps64 & 0xffffffff00000000ULL) { |
| tps64 >>= 1; |
| shift--; |
| } |
| |
| tps32 = (uint32_t)tps64; |
| while (tps32 <= scaled64 || scaled64 & 0xffffffff00000000ULL) { |
| if (scaled64 & 0xffffffff00000000ULL || tps32 & 0x80000000) |
| scaled64 >>= 1; |
| else |
| tps32 <<= 1; |
| shift++; |
| } |
| |
| *pshift = shift; |
| *pmultiplier = div_frac(scaled64, tps32); |
| |
| pr_debug("%s: base_khz %u => %u, shift %d, mul %u\n", |
| __func__, base_khz, scaled_khz, shift, *pmultiplier); |
| } |
| |
| static inline u64 get_kernel_ns(void) |
| { |
| struct timespec ts; |
| |
| WARN_ON(preemptible()); |
| ktime_get_ts(&ts); |
| monotonic_to_bootbased(&ts); |
| return timespec_to_ns(&ts); |
| } |
| |
| static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz); |
| unsigned long max_tsc_khz; |
| |
| static inline int kvm_tsc_changes_freq(void) |
| { |
| int cpu = get_cpu(); |
| int ret = !boot_cpu_has(X86_FEATURE_CONSTANT_TSC) && |
| cpufreq_quick_get(cpu) != 0; |
| put_cpu(); |
| return ret; |
| } |
| |
| u64 vcpu_tsc_khz(struct kvm_vcpu *vcpu) |
| { |
| if (vcpu->arch.virtual_tsc_khz) |
| return vcpu->arch.virtual_tsc_khz; |
| else |
| return __this_cpu_read(cpu_tsc_khz); |
| } |
| |
| static inline u64 nsec_to_cycles(struct kvm_vcpu *vcpu, u64 nsec) |
| { |
| u64 ret; |
| |
| WARN_ON(preemptible()); |
| if (kvm_tsc_changes_freq()) |
| printk_once(KERN_WARNING |
| "kvm: unreliable cycle conversion on adjustable rate TSC\n"); |
| ret = nsec * vcpu_tsc_khz(vcpu); |
| do_div(ret, USEC_PER_SEC); |
| return ret; |
| } |
| |
| static void kvm_init_tsc_catchup(struct kvm_vcpu *vcpu, u32 this_tsc_khz) |
| { |
| /* Compute a scale to convert nanoseconds in TSC cycles */ |
| kvm_get_time_scale(this_tsc_khz, NSEC_PER_SEC / 1000, |
| &vcpu->arch.tsc_catchup_shift, |
| &vcpu->arch.tsc_catchup_mult); |
| } |
| |
| static u64 compute_guest_tsc(struct kvm_vcpu *vcpu, s64 kernel_ns) |
| { |
| u64 tsc = pvclock_scale_delta(kernel_ns-vcpu->arch.last_tsc_nsec, |
| vcpu->arch.tsc_catchup_mult, |
| vcpu->arch.tsc_catchup_shift); |
| tsc += vcpu->arch.last_tsc_write; |
| return tsc; |
| } |
| |
| void kvm_write_tsc(struct kvm_vcpu *vcpu, u64 data) |
| { |
| struct kvm *kvm = vcpu->kvm; |
| u64 offset, ns, elapsed; |
| unsigned long flags; |
| s64 sdiff; |
| |
| raw_spin_lock_irqsave(&kvm->arch.tsc_write_lock, flags); |
| offset = kvm_x86_ops->compute_tsc_offset(vcpu, data); |
| ns = get_kernel_ns(); |
| elapsed = ns - kvm->arch.last_tsc_nsec; |
| sdiff = data - kvm->arch.last_tsc_write; |
| if (sdiff < 0) |
| sdiff = -sdiff; |
| |
| /* |
| * Special case: close write to TSC within 5 seconds of |
| * another CPU is interpreted as an attempt to synchronize |
| * The 5 seconds is to accommodate host load / swapping as |
| * well as any reset of TSC during the boot process. |
| * |
| * In that case, for a reliable TSC, we can match TSC offsets, |
| * or make a best guest using elapsed value. |
| */ |
| if (sdiff < nsec_to_cycles(vcpu, 5ULL * NSEC_PER_SEC) && |
| elapsed < 5ULL * NSEC_PER_SEC) { |
| if (!check_tsc_unstable()) { |
| offset = kvm->arch.last_tsc_offset; |
| pr_debug("kvm: matched tsc offset for %llu\n", data); |
| } else { |
| u64 delta = nsec_to_cycles(vcpu, elapsed); |
| offset += delta; |
| pr_debug("kvm: adjusted tsc offset by %llu\n", delta); |
| } |
| ns = kvm->arch.last_tsc_nsec; |
| } |
| kvm->arch.last_tsc_nsec = ns; |
| kvm->arch.last_tsc_write = data; |
| kvm->arch.last_tsc_offset = offset; |
| kvm_x86_ops->write_tsc_offset(vcpu, offset); |
| raw_spin_unlock_irqrestore(&kvm->arch.tsc_write_lock, flags); |
| |
| /* Reset of TSC must disable overshoot protection below */ |
| vcpu->arch.hv_clock.tsc_timestamp = 0; |
| vcpu->arch.last_tsc_write = data; |
| vcpu->arch.last_tsc_nsec = ns; |
| } |
| EXPORT_SYMBOL_GPL(kvm_write_tsc); |
| |
| static int kvm_guest_time_update(struct kvm_vcpu *v) |
| { |
| unsigned long flags; |
| struct kvm_vcpu_arch *vcpu = &v->arch; |
| void *shared_kaddr; |
| unsigned long this_tsc_khz; |
| s64 kernel_ns, max_kernel_ns; |
| u64 tsc_timestamp; |
| |
| /* Keep irq disabled to prevent changes to the clock */ |
| local_irq_save(flags); |
| tsc_timestamp = kvm_x86_ops->read_l1_tsc(v); |
| kernel_ns = get_kernel_ns(); |
| this_tsc_khz = vcpu_tsc_khz(v); |
| if (unlikely(this_tsc_khz == 0)) { |
| local_irq_restore(flags); |
| kvm_make_request(KVM_REQ_CLOCK_UPDATE, v); |
| return 1; |
| } |
| |
| /* |
| * We may have to catch up the TSC to match elapsed wall clock |
| * time for two reasons, even if kvmclock is used. |
| * 1) CPU could have been running below the maximum TSC rate |
| * 2) Broken TSC compensation resets the base at each VCPU |
| * entry to avoid unknown leaps of TSC even when running |
| * again on the same CPU. This may cause apparent elapsed |
| * time to disappear, and the guest to stand still or run |
| * very slowly. |
| */ |
| if (vcpu->tsc_catchup) { |
| u64 tsc = compute_guest_tsc(v, kernel_ns); |
| if (tsc > tsc_timestamp) { |
| kvm_x86_ops->adjust_tsc_offset(v, tsc - tsc_timestamp); |
| tsc_timestamp = tsc; |
| } |
| } |
| |
| local_irq_restore(flags); |
| |
| if (!vcpu->time_page) |
| return 0; |
| |
| /* |
| * Time as measured by the TSC may go backwards when resetting the base |
| * tsc_timestamp. The reason for this is that the TSC resolution is |
| * higher than the resolution of the other clock scales. Thus, many |
| * possible measurments of the TSC correspond to one measurement of any |
| * other clock, and so a spread of values is possible. This is not a |
| * problem for the computation of the nanosecond clock; with TSC rates |
| * around 1GHZ, there can only be a few cycles which correspond to one |
| * nanosecond value, and any path through this code will inevitably |
| * take longer than that. However, with the kernel_ns value itself, |
| * the precision may be much lower, down to HZ granularity. If the |
| * first sampling of TSC against kernel_ns ends in the low part of the |
| * range, and the second in the high end of the range, we can get: |
| * |
| * (TSC - offset_low) * S + kns_old > (TSC - offset_high) * S + kns_new |
| * |
| * As the sampling errors potentially range in the thousands of cycles, |
| * it is possible such a time value has already been observed by the |
| * guest. To protect against this, we must compute the system time as |
| * observed by the guest and ensure the new system time is greater. |
| */ |
| max_kernel_ns = 0; |
| if (vcpu->hv_clock.tsc_timestamp && vcpu->last_guest_tsc) { |
| max_kernel_ns = vcpu->last_guest_tsc - |
| vcpu->hv_clock.tsc_timestamp; |
| max_kernel_ns = pvclock_scale_delta(max_kernel_ns, |
| vcpu->hv_clock.tsc_to_system_mul, |
| vcpu->hv_clock.tsc_shift); |
| max_kernel_ns += vcpu->last_kernel_ns; |
| } |
| |
| if (unlikely(vcpu->hw_tsc_khz != this_tsc_khz)) { |
| kvm_get_time_scale(NSEC_PER_SEC / 1000, this_tsc_khz, |
| &vcpu->hv_clock.tsc_shift, |
| &vcpu->hv_clock.tsc_to_system_mul); |
| vcpu->hw_tsc_khz = this_tsc_khz; |
| } |
| |
| if (max_kernel_ns > kernel_ns) |
| kernel_ns = max_kernel_ns; |
| |
| /* With all the info we got, fill in the values */ |
| vcpu->hv_clock.tsc_timestamp = tsc_timestamp; |
| vcpu->hv_clock.system_time = kernel_ns + v->kvm->arch.kvmclock_offset; |
| vcpu->last_kernel_ns = kernel_ns; |
| vcpu->last_guest_tsc = tsc_timestamp; |
| vcpu->hv_clock.flags = 0; |
| |
| /* |
| * The interface expects us to write an even number signaling that the |
| * update is finished. Since the guest won't see the intermediate |
| * state, we just increase by 2 at the end. |
| */ |
| vcpu->hv_clock.version += 2; |
| |
| shared_kaddr = kmap_atomic(vcpu->time_page, KM_USER0); |
| |
| memcpy(shared_kaddr + vcpu->time_offset, &vcpu->hv_clock, |
| sizeof(vcpu->hv_clock)); |
| |
| kunmap_atomic(shared_kaddr, KM_USER0); |
| |
| mark_page_dirty(v->kvm, vcpu->time >> PAGE_SHIFT); |
| return 0; |
| } |
| |
| static bool msr_mtrr_valid(unsigned msr) |
| { |
| switch (msr) { |
| case 0x200 ... 0x200 + 2 * KVM_NR_VAR_MTRR - 1: |
| case MSR_MTRRfix64K_00000: |
| case MSR_MTRRfix16K_80000: |
| case MSR_MTRRfix16K_A0000: |
| case MSR_MTRRfix4K_C0000: |
| case MSR_MTRRfix4K_C8000: |
| case MSR_MTRRfix4K_D0000: |
| case MSR_MTRRfix4K_D8000: |
| case MSR_MTRRfix4K_E0000: |
| case MSR_MTRRfix4K_E8000: |
| case MSR_MTRRfix4K_F0000: |
| case MSR_MTRRfix4K_F8000: |
| case MSR_MTRRdefType: |
| case MSR_IA32_CR_PAT: |
| return true; |
| case 0x2f8: |
| return true; |
| } |
| return false; |
| } |
| |
| static bool valid_pat_type(unsigned t) |
| { |
| return t < 8 && (1 << t) & 0xf3; /* 0, 1, 4, 5, 6, 7 */ |
| } |
| |
| static bool valid_mtrr_type(unsigned t) |
| { |
| return t < 8 && (1 << t) & 0x73; /* 0, 1, 4, 5, 6 */ |
| } |
| |
| static bool mtrr_valid(struct kvm_vcpu *vcpu, u32 msr, u64 data) |
| { |
| int i; |
| |
| if (!msr_mtrr_valid(msr)) |
| return false; |
| |
| if (msr == MSR_IA32_CR_PAT) { |
| for (i = 0; i < 8; i++) |
| if (!valid_pat_type((data >> (i * 8)) & 0xff)) |
| return false; |
| return true; |
| } else if (msr == MSR_MTRRdefType) { |
| if (data & ~0xcff) |
| return false; |
| return valid_mtrr_type(data & 0xff); |
| } else if (msr >= MSR_MTRRfix64K_00000 && msr <= MSR_MTRRfix4K_F8000) { |
| for (i = 0; i < 8 ; i++) |
| if (!valid_mtrr_type((data >> (i * 8)) & 0xff)) |
| return false; |
| return true; |
| } |
| |
| /* variable MTRRs */ |
| return valid_mtrr_type(data & 0xff); |
| } |
| |
| static int set_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 data) |
| { |
| u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges; |
| |
| if (!mtrr_valid(vcpu, msr, data)) |
| return 1; |
| |
| if (msr == MSR_MTRRdefType) { |
| vcpu->arch.mtrr_state.def_type = data; |
| vcpu->arch.mtrr_state.enabled = (data & 0xc00) >> 10; |
| } else if (msr == MSR_MTRRfix64K_00000) |
| p[0] = data; |
| else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000) |
| p[1 + msr - MSR_MTRRfix16K_80000] = data; |
| else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000) |
| p[3 + msr - MSR_MTRRfix4K_C0000] = data; |
| else if (msr == MSR_IA32_CR_PAT) |
| vcpu->arch.pat = data; |
| else { /* Variable MTRRs */ |
| int idx, is_mtrr_mask; |
| u64 *pt; |
| |
| idx = (msr - 0x200) / 2; |
| is_mtrr_mask = msr - 0x200 - 2 * idx; |
| if (!is_mtrr_mask) |
| pt = |
| (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo; |
| else |
| pt = |
| (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo; |
| *pt = data; |
| } |
| |
| kvm_mmu_reset_context(vcpu); |
| return 0; |
| } |
| |
| static int set_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 data) |
| { |
| u64 mcg_cap = vcpu->arch.mcg_cap; |
| unsigned bank_num = mcg_cap & 0xff; |
| |
| switch (msr) { |
| case MSR_IA32_MCG_STATUS: |
| vcpu->arch.mcg_status = data; |
| break; |
| case MSR_IA32_MCG_CTL: |
| if (!(mcg_cap & MCG_CTL_P)) |
| return 1; |
| if (data != 0 && data != ~(u64)0) |
| return -1; |
| vcpu->arch.mcg_ctl = data; |
| break; |
| default: |
| if (msr >= MSR_IA32_MC0_CTL && |
| msr < MSR_IA32_MC0_CTL + 4 * bank_num) { |
| u32 offset = msr - MSR_IA32_MC0_CTL; |
| /* only 0 or all 1s can be written to IA32_MCi_CTL |
| * some Linux kernels though clear bit 10 in bank 4 to |
| * workaround a BIOS/GART TBL issue on AMD K8s, ignore |
| * this to avoid an uncatched #GP in the guest |
| */ |
| if ((offset & 0x3) == 0 && |
| data != 0 && (data | (1 << 10)) != ~(u64)0) |
| return -1; |
| vcpu->arch.mce_banks[offset] = data; |
| break; |
| } |
| return 1; |
| } |
| return 0; |
| } |
| |
| static int xen_hvm_config(struct kvm_vcpu *vcpu, u64 data) |
| { |
| struct kvm *kvm = vcpu->kvm; |
| int lm = is_long_mode(vcpu); |
| u8 *blob_addr = lm ? (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_64 |
| : (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_32; |
| u8 blob_size = lm ? kvm->arch.xen_hvm_config.blob_size_64 |
| : kvm->arch.xen_hvm_config.blob_size_32; |
| u32 page_num = data & ~PAGE_MASK; |
| u64 page_addr = data & PAGE_MASK; |
| u8 *page; |
| int r; |
| |
| r = -E2BIG; |
| if (page_num >= blob_size) |
| goto out; |
| r = -ENOMEM; |
| page = kzalloc(PAGE_SIZE, GFP_KERNEL); |
| if (!page) |
| goto out; |
| r = -EFAULT; |
| if (copy_from_user(page, blob_addr + (page_num * PAGE_SIZE), PAGE_SIZE)) |
| goto out_free; |
| if (kvm_write_guest(kvm, page_addr, page, PAGE_SIZE)) |
| goto out_free; |
| r = 0; |
| out_free: |
| kfree(page); |
| out: |
| return r; |
| } |
| |
| static bool kvm_hv_hypercall_enabled(struct kvm *kvm) |
| { |
| return kvm->arch.hv_hypercall & HV_X64_MSR_HYPERCALL_ENABLE; |
| } |
| |
| static bool kvm_hv_msr_partition_wide(u32 msr) |
| { |
| bool r = false; |
| switch (msr) { |
| case HV_X64_MSR_GUEST_OS_ID: |
| case HV_X64_MSR_HYPERCALL: |
| r = true; |
| break; |
| } |
| |
| return r; |
| } |
| |
| static int set_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data) |
| { |
| struct kvm *kvm = vcpu->kvm; |
| |
| switch (msr) { |
| case HV_X64_MSR_GUEST_OS_ID: |
| kvm->arch.hv_guest_os_id = data; |
| /* setting guest os id to zero disables hypercall page */ |
| if (!kvm->arch.hv_guest_os_id) |
| kvm->arch.hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE; |
| break; |
| case HV_X64_MSR_HYPERCALL: { |
| u64 gfn; |
| unsigned long addr; |
| u8 instructions[4]; |
| |
| /* if guest os id is not set hypercall should remain disabled */ |
| if (!kvm->arch.hv_guest_os_id) |
| break; |
| if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) { |
| kvm->arch.hv_hypercall = data; |
| break; |
| } |
| gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT; |
| addr = gfn_to_hva(kvm, gfn); |
| if (kvm_is_error_hva(addr)) |
| return 1; |
| kvm_x86_ops->patch_hypercall(vcpu, instructions); |
| ((unsigned char *)instructions)[3] = 0xc3; /* ret */ |
| if (__copy_to_user((void __user *)addr, instructions, 4)) |
| return 1; |
| kvm->arch.hv_hypercall = data; |
| break; |
| } |
| default: |
| pr_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x " |
| "data 0x%llx\n", msr, data); |
| return 1; |
| } |
| return 0; |
| } |
| |
| static int set_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 data) |
| { |
| switch (msr) { |
| case HV_X64_MSR_APIC_ASSIST_PAGE: { |
| unsigned long addr; |
| |
| if (!(data & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE)) { |
| vcpu->arch.hv_vapic = data; |
| break; |
| } |
| addr = gfn_to_hva(vcpu->kvm, data >> |
| HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT); |
| if (kvm_is_error_hva(addr)) |
| return 1; |
| if (__clear_user((void __user *)addr, PAGE_SIZE)) |
| return 1; |
| vcpu->arch.hv_vapic = data; |
| break; |
| } |
| case HV_X64_MSR_EOI: |
| return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data); |
| case HV_X64_MSR_ICR: |
| return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data); |
| case HV_X64_MSR_TPR: |
| return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data); |
| default: |
| pr_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x " |
| "data 0x%llx\n", msr, data); |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data) |
| { |
| gpa_t gpa = data & ~0x3f; |
| |
| /* Bits 2:5 are resrved, Should be zero */ |
| if (data & 0x3c) |
| return 1; |
| |
| vcpu->arch.apf.msr_val = data; |
| |
| if (!(data & KVM_ASYNC_PF_ENABLED)) { |
| kvm_clear_async_pf_completion_queue(vcpu); |
| kvm_async_pf_hash_reset(vcpu); |
| return 0; |
| } |
| |
| if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.apf.data, gpa)) |
| return 1; |
| |
| vcpu->arch.apf.send_user_only = !(data & KVM_ASYNC_PF_SEND_ALWAYS); |
| kvm_async_pf_wakeup_all(vcpu); |
| return 0; |
| } |
| |
| static void kvmclock_reset(struct kvm_vcpu *vcpu) |
| { |
| if (vcpu->arch.time_page) { |
| kvm_release_page_dirty(vcpu->arch.time_page); |
| vcpu->arch.time_page = NULL; |
| } |
| } |
| |
| static void accumulate_steal_time(struct kvm_vcpu *vcpu) |
| { |
| u64 delta; |
| |
| if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED)) |
| return; |
| |
| delta = current->sched_info.run_delay - vcpu->arch.st.last_steal; |
| vcpu->arch.st.last_steal = current->sched_info.run_delay; |
| vcpu->arch.st.accum_steal = delta; |
| } |
| |
| static void record_steal_time(struct kvm_vcpu *vcpu) |
| { |
| if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED)) |
| return; |
| |
| if (unlikely(kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.st.stime, |
| &vcpu->arch.st.steal, sizeof(struct kvm_steal_time)))) |
| return; |
| |
| vcpu->arch.st.steal.steal += vcpu->arch.st.accum_steal; |
| vcpu->arch.st.steal.version += 2; |
| vcpu->arch.st.accum_steal = 0; |
| |
| kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime, |
| &vcpu->arch.st.steal, sizeof(struct kvm_steal_time)); |
| } |
| |
| int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data) |
| { |
| switch (msr) { |
| case MSR_EFER: |
| return set_efer(vcpu, data); |
| case MSR_K7_HWCR: |
| data &= ~(u64)0x40; /* ignore flush filter disable */ |
| data &= ~(u64)0x100; /* ignore ignne emulation enable */ |
| if (data != 0) { |
| pr_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n", |
| data); |
| return 1; |
| } |
| break; |
| case MSR_FAM10H_MMIO_CONF_BASE: |
| if (data != 0) { |
| pr_unimpl(vcpu, "unimplemented MMIO_CONF_BASE wrmsr: " |
| "0x%llx\n", data); |
| return 1; |
| } |
| break; |
| case MSR_AMD64_NB_CFG: |
| break; |
| case MSR_IA32_DEBUGCTLMSR: |
| if (!data) { |
| /* We support the non-activated case already */ |
| break; |
| } else if (data & ~(DEBUGCTLMSR_LBR | DEBUGCTLMSR_BTF)) { |
| /* Values other than LBR and BTF are vendor-specific, |
| thus reserved and should throw a #GP */ |
| return 1; |
| } |
| pr_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n", |
| __func__, data); |
| break; |
| case MSR_IA32_UCODE_REV: |
| case MSR_IA32_UCODE_WRITE: |
| case MSR_VM_HSAVE_PA: |
| case MSR_AMD64_PATCH_LOADER: |
| break; |
| case 0x200 ... 0x2ff: |
| return set_msr_mtrr(vcpu, msr, data); |
| case MSR_IA32_APICBASE: |
| kvm_set_apic_base(vcpu, data); |
| break; |
| case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff: |
| return kvm_x2apic_msr_write(vcpu, msr, data); |
| case MSR_IA32_TSCDEADLINE: |
| kvm_set_lapic_tscdeadline_msr(vcpu, data); |
| break; |
| case MSR_IA32_MISC_ENABLE: |
| vcpu->arch.ia32_misc_enable_msr = data; |
| break; |
| case MSR_KVM_WALL_CLOCK_NEW: |
| case MSR_KVM_WALL_CLOCK: |
| vcpu->kvm->arch.wall_clock = data; |
| kvm_write_wall_clock(vcpu->kvm, data); |
| break; |
| case MSR_KVM_SYSTEM_TIME_NEW: |
| case MSR_KVM_SYSTEM_TIME: { |
| kvmclock_reset(vcpu); |
| |
| vcpu->arch.time = data; |
| kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); |
| |
| /* we verify if the enable bit is set... */ |
| if (!(data & 1)) |
| break; |
| |
| /* ...but clean it before doing the actual write */ |
| vcpu->arch.time_offset = data & ~(PAGE_MASK | 1); |
| |
| vcpu->arch.time_page = |
| gfn_to_page(vcpu->kvm, data >> PAGE_SHIFT); |
| |
| if (is_error_page(vcpu->arch.time_page)) { |
| kvm_release_page_clean(vcpu->arch.time_page); |
| vcpu->arch.time_page = NULL; |
| } |
| break; |
| } |
| case MSR_KVM_ASYNC_PF_EN: |
| if (kvm_pv_enable_async_pf(vcpu, data)) |
| return 1; |
| break; |
| case MSR_KVM_STEAL_TIME: |
| |
| if (unlikely(!sched_info_on())) |
| return 1; |
| |
| if (data & KVM_STEAL_RESERVED_MASK) |
| return 1; |
| |
| if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.st.stime, |
| data & KVM_STEAL_VALID_BITS)) |
| return 1; |
| |
| vcpu->arch.st.msr_val = data; |
| |
| if (!(data & KVM_MSR_ENABLED)) |
| break; |
| |
| vcpu->arch.st.last_steal = current->sched_info.run_delay; |
| |
| preempt_disable(); |
| accumulate_steal_time(vcpu); |
| preempt_enable(); |
| |
| kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu); |
| |
| break; |
| |
| case MSR_IA32_MCG_CTL: |
| case MSR_IA32_MCG_STATUS: |
| case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1: |
| return set_msr_mce(vcpu, msr, data); |
| |
| /* Performance counters are not protected by a CPUID bit, |
| * so we should check all of them in the generic path for the sake of |
| * cross vendor migration. |
| * Writing a zero into the event select MSRs disables them, |
| * which we perfectly emulate ;-). Any other value should be at least |
| * reported, some guests depend on them. |
| */ |
| case MSR_P6_EVNTSEL0: |
| case MSR_P6_EVNTSEL1: |
| case MSR_K7_EVNTSEL0: |
| case MSR_K7_EVNTSEL1: |
| case MSR_K7_EVNTSEL2: |
| case MSR_K7_EVNTSEL3: |
| if (data != 0) |
| pr_unimpl(vcpu, "unimplemented perfctr wrmsr: " |
| "0x%x data 0x%llx\n", msr, data); |
| break; |
| /* at least RHEL 4 unconditionally writes to the perfctr registers, |
| * so we ignore writes to make it happy. |
| */ |
| case MSR_P6_PERFCTR0: |
| case MSR_P6_PERFCTR1: |
| case MSR_K7_PERFCTR0: |
| case MSR_K7_PERFCTR1: |
| case MSR_K7_PERFCTR2: |
| case MSR_K7_PERFCTR3: |
| pr_unimpl(vcpu, "unimplemented perfctr wrmsr: " |
| "0x%x data 0x%llx\n", msr, data); |
| break; |
| case MSR_K7_CLK_CTL: |
| /* |
| * Ignore all writes to this no longer documented MSR. |
| * Writes are only relevant for old K7 processors, |
| * all pre-dating SVM, but a recommended workaround from |
| * AMD for these chips. It is possible to speicify the |
| * affected processor models on the command line, hence |
| * the need to ignore the workaround. |
| */ |
| break; |
| case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15: |
| if (kvm_hv_msr_partition_wide(msr)) { |
| int r; |
| mutex_lock(&vcpu->kvm->lock); |
| r = set_msr_hyperv_pw(vcpu, msr, data); |
| mutex_unlock(&vcpu->kvm->lock); |
| return r; |
| } else |
| return set_msr_hyperv(vcpu, msr, data); |
| break; |
| case MSR_IA32_BBL_CR_CTL3: |
| /* Drop writes to this legacy MSR -- see rdmsr |
| * counterpart for further detail. |
| */ |
| pr_unimpl(vcpu, "ignored wrmsr: 0x%x data %llx\n", msr, data); |
| break; |
| default: |
| if (msr && (msr == vcpu->kvm->arch.xen_hvm_config.msr)) |
| return xen_hvm_config(vcpu, data); |
| if (!ignore_msrs) { |
| pr_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n", |
| msr, data); |
| return 1; |
| } else { |
| pr_unimpl(vcpu, "ignored wrmsr: 0x%x data %llx\n", |
| msr, data); |
| break; |
| } |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(kvm_set_msr_common); |
| |
| |
| /* |
| * Reads an msr value (of 'msr_index') into 'pdata'. |
| * Returns 0 on success, non-0 otherwise. |
| * Assumes vcpu_load() was already called. |
| */ |
| int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata) |
| { |
| return kvm_x86_ops->get_msr(vcpu, msr_index, pdata); |
| } |
| |
| static int get_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) |
| { |
| u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges; |
| |
| if (!msr_mtrr_valid(msr)) |
| return 1; |
| |
| if (msr == MSR_MTRRdefType) |
| *pdata = vcpu->arch.mtrr_state.def_type + |
| (vcpu->arch.mtrr_state.enabled << 10); |
| else if (msr == MSR_MTRRfix64K_00000) |
| *pdata = p[0]; |
| else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000) |
| *pdata = p[1 + msr - MSR_MTRRfix16K_80000]; |
| else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000) |
| *pdata = p[3 + msr - MSR_MTRRfix4K_C0000]; |
| else if (msr == MSR_IA32_CR_PAT) |
| *pdata = vcpu->arch.pat; |
| else { /* Variable MTRRs */ |
| int idx, is_mtrr_mask; |
| u64 *pt; |
| |
| idx = (msr - 0x200) / 2; |
| is_mtrr_mask = msr - 0x200 - 2 * idx; |
| if (!is_mtrr_mask) |
| pt = |
| (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo; |
| else |
| pt = |
| (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo; |
| *pdata = *pt; |
| } |
| |
| return 0; |
| } |
| |
| static int get_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) |
| { |
| u64 data; |
| u64 mcg_cap = vcpu->arch.mcg_cap; |
| unsigned bank_num = mcg_cap & 0xff; |
| |
| switch (msr) { |
| case MSR_IA32_P5_MC_ADDR: |
| case MSR_IA32_P5_MC_TYPE: |
| data = 0; |
| break; |
| case MSR_IA32_MCG_CAP: |
| data = vcpu->arch.mcg_cap; |
| break; |
| case MSR_IA32_MCG_CTL: |
| if (!(mcg_cap & MCG_CTL_P)) |
| return 1; |
| data = vcpu->arch.mcg_ctl; |
| break; |
| case MSR_IA32_MCG_STATUS: |
| data = vcpu->arch.mcg_status; |
| break; |
| default: |
| if (msr >= MSR_IA32_MC0_CTL && |
| msr < MSR_IA32_MC0_CTL + 4 * bank_num) { |
| u32 offset = msr - MSR_IA32_MC0_CTL; |
| data = vcpu->arch.mce_banks[offset]; |
| break; |
| } |
| return 1; |
| } |
| *pdata = data; |
| return 0; |
| } |
| |
| static int get_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) |
| { |
| u64 data = 0; |
| struct kvm *kvm = vcpu->kvm; |
| |
| switch (msr) { |
| case HV_X64_MSR_GUEST_OS_ID: |
| data = kvm->arch.hv_guest_os_id; |
| break; |
| case HV_X64_MSR_HYPERCALL: |
| data = kvm->arch.hv_hypercall; |
| break; |
| default: |
| pr_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr); |
| return 1; |
| } |
| |
| *pdata = data; |
| return 0; |
| } |
| |
| static int get_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) |
| { |
| u64 data = 0; |
| |
| switch (msr) { |
| case HV_X64_MSR_VP_INDEX: { |
| int r; |
| struct kvm_vcpu *v; |
| kvm_for_each_vcpu(r, v, vcpu->kvm) |
| if (v == vcpu) |
| data = r; |
| break; |
| } |
| case HV_X64_MSR_EOI: |
| return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata); |
| case HV_X64_MSR_ICR: |
| return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata); |
| case HV_X64_MSR_TPR: |
| return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata); |
| case HV_X64_MSR_APIC_ASSIST_PAGE: |
| data = vcpu->arch.hv_vapic; |
| break; |
| default: |
| pr_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr); |
| return 1; |
| } |
| *pdata = data; |
| return 0; |
| } |
| |
| int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) |
| { |
| u64 data; |
| |
| switch (msr) { |
| case MSR_IA32_PLATFORM_ID: |
| case MSR_IA32_EBL_CR_POWERON: |
| case MSR_IA32_DEBUGCTLMSR: |
| case MSR_IA32_LASTBRANCHFROMIP: |
| case MSR_IA32_LASTBRANCHTOIP: |
| case MSR_IA32_LASTINTFROMIP: |
| case MSR_IA32_LASTINTTOIP: |
| case MSR_K8_SYSCFG: |
| case MSR_K7_HWCR: |
| case MSR_VM_HSAVE_PA: |
| case MSR_P6_PERFCTR0: |
| case MSR_P6_PERFCTR1: |
| case MSR_P6_EVNTSEL0: |
| case MSR_P6_EVNTSEL1: |
| case MSR_K7_EVNTSEL0: |
| case MSR_K7_PERFCTR0: |
| case MSR_K8_INT_PENDING_MSG: |
| case MSR_AMD64_NB_CFG: |
| case MSR_FAM10H_MMIO_CONF_BASE: |
| data = 0; |
| break; |
| case MSR_IA32_UCODE_REV: |
| data = 0x100000000ULL; |
| break; |
| case MSR_MTRRcap: |
| data = 0x500 | KVM_NR_VAR_MTRR; |
| break; |
| case 0x200 ... 0x2ff: |
| return get_msr_mtrr(vcpu, msr, pdata); |
| case 0xcd: /* fsb frequency */ |
| data = 3; |
| break; |
| /* |
| * MSR_EBC_FREQUENCY_ID |
| * Conservative value valid for even the basic CPU models. |
| * Models 0,1: 000 in bits 23:21 indicating a bus speed of |
| * 100MHz, model 2 000 in bits 18:16 indicating 100MHz, |
| * and 266MHz for model 3, or 4. Set Core Clock |
| * Frequency to System Bus Frequency Ratio to 1 (bits |
| * 31:24) even though these are only valid for CPU |
| * models > 2, however guests may end up dividing or |
| * multiplying by zero otherwise. |
| */ |
| case MSR_EBC_FREQUENCY_ID: |
| data = 1 << 24; |
| break; |
| case MSR_IA32_APICBASE: |
| data = kvm_get_apic_base(vcpu); |
| break; |
| case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff: |
| return kvm_x2apic_msr_read(vcpu, msr, pdata); |
| break; |
| case MSR_IA32_TSCDEADLINE: |
| data = kvm_get_lapic_tscdeadline_msr(vcpu); |
| break; |
| case MSR_IA32_MISC_ENABLE: |
| data = vcpu->arch.ia32_misc_enable_msr; |
| break; |
| case MSR_IA32_PERF_STATUS: |
| /* TSC increment by tick */ |
| data = 1000ULL; |
| /* CPU multiplier */ |
| data |= (((uint64_t)4ULL) << 40); |
| break; |
| case MSR_EFER: |
| data = vcpu->arch.efer; |
| break; |
| case MSR_KVM_WALL_CLOCK: |
| case MSR_KVM_WALL_CLOCK_NEW: |
| data = vcpu->kvm->arch.wall_clock; |
| break; |
| case MSR_KVM_SYSTEM_TIME: |
| case MSR_KVM_SYSTEM_TIME_NEW: |
| data = vcpu->arch.time; |
| break; |
| case MSR_KVM_ASYNC_PF_EN: |
| data = vcpu->arch.apf.msr_val; |
| break; |
| case MSR_KVM_STEAL_TIME: |
| data = vcpu->arch.st.msr_val; |
| break; |
| case MSR_IA32_P5_MC_ADDR: |
| case MSR_IA32_P5_MC_TYPE: |
| case MSR_IA32_MCG_CAP: |
| case MSR_IA32_MCG_CTL: |
| case MSR_IA32_MCG_STATUS: |
| case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1: |
| return get_msr_mce(vcpu, msr, pdata); |
| case MSR_K7_CLK_CTL: |
| /* |
| * Provide expected ramp-up count for K7. All other |
| * are set to zero, indicating minimum divisors for |
| * every field. |
| * |
| * This prevents guest kernels on AMD host with CPU |
| * type 6, model 8 and higher from exploding due to |
| * the rdmsr failing. |
| */ |
| data = 0x20000000; |
| break; |
| case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15: |
| if (kvm_hv_msr_partition_wide(msr)) { |
| int r; |
| mutex_lock(&vcpu->kvm->lock); |
| r = get_msr_hyperv_pw(vcpu, msr, pdata); |
| mutex_unlock(&vcpu->kvm->lock); |
| return r; |
| } else |
| return get_msr_hyperv(vcpu, msr, pdata); |
| break; |
| case MSR_IA32_BBL_CR_CTL3: |
| /* This legacy MSR exists but isn't fully documented in current |
| * silicon. It is however accessed by winxp in very narrow |
| * scenarios where it sets bit #19, itself documented as |
| * a "reserved" bit. Best effort attempt to source coherent |
| * read data here should the balance of the register be |
| * interpreted by the guest: |
| * |
| * L2 cache control register 3: 64GB range, 256KB size, |
| * enabled, latency 0x1, configured |
| */ |
| data = 0xbe702111; |
| break; |
| default: |
| if (!ignore_msrs) { |
| pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr); |
| return 1; |
| } else { |
| pr_unimpl(vcpu, "ignored rdmsr: 0x%x\n", msr); |
| data = 0; |
| } |
| break; |
| } |
| *pdata = data; |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(kvm_get_msr_common); |
| |
| /* |
| * Read or write a bunch of msrs. All parameters are kernel addresses. |
| * |
| * @return number of msrs set successfully. |
| */ |
| static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs, |
| struct kvm_msr_entry *entries, |
| int (*do_msr)(struct kvm_vcpu *vcpu, |
| unsigned index, u64 *data)) |
| { |
| int i, idx; |
| |
| idx = srcu_read_lock(&vcpu->kvm->srcu); |
| for (i = 0; i < msrs->nmsrs; ++i) |
| if (do_msr(vcpu, entries[i].index, &entries[i].data)) |
| break; |
| srcu_read_unlock(&vcpu->kvm->srcu, idx); |
| |
| return i; |
| } |
| |
| /* |
| * Read or write a bunch of msrs. Parameters are user addresses. |
| * |
| * @return number of msrs set successfully. |
| */ |
| static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs, |
| int (*do_msr)(struct kvm_vcpu *vcpu, |
| unsigned index, u64 *data), |
| int writeback) |
| { |
| struct kvm_msrs msrs; |
| struct kvm_msr_entry *entries; |
| int r, n; |
| unsigned size; |
| |
| r = -EFAULT; |
| if (copy_from_user(&msrs, user_msrs, sizeof msrs)) |
| goto out; |
| |
| r = -E2BIG; |
| if (msrs.nmsrs >= MAX_IO_MSRS) |
| goto out; |
| |
| r = -ENOMEM; |
| size = sizeof(struct kvm_msr_entry) * msrs.nmsrs; |
| entries = kmalloc(size, GFP_KERNEL); |
| if (!entries) |
| goto out; |
| |
| r = -EFAULT; |
| if (copy_from_user(entries, user_msrs->entries, size)) |
| goto out_free; |
| |
| r = n = __msr_io(vcpu, &msrs, entries, do_msr); |
| if (r < 0) |
| goto out_free; |
| |
| r = -EFAULT; |
| if (writeback && copy_to_user(user_msrs->entries, entries, size)) |
| goto out_free; |
| |
| r = n; |
| |
| out_free: |
| kfree(entries); |
| out: |
| return r; |
| } |
| |
| int kvm_dev_ioctl_check_extension(long ext) |
| { |
| int r; |
| |
| switch (ext) { |
| case KVM_CAP_IRQCHIP: |
| case KVM_CAP_HLT: |
| case KVM_CAP_MMU_SHADOW_CACHE_CONTROL: |
| case KVM_CAP_SET_TSS_ADDR: |
| case KVM_CAP_EXT_CPUID: |
| case KVM_CAP_CLOCKSOURCE: |
| case KVM_CAP_PIT: |
| case KVM_CAP_NOP_IO_DELAY: |
| case KVM_CAP_MP_STATE: |
| case KVM_CAP_SYNC_MMU: |
| case KVM_CAP_USER_NMI: |
| case KVM_CAP_REINJECT_CONTROL: |
| case KVM_CAP_IRQ_INJECT_STATUS: |
| case KVM_CAP_ASSIGN_DEV_IRQ: |
| case KVM_CAP_IRQFD: |
| case KVM_CAP_IOEVENTFD: |
| case KVM_CAP_PIT2: |
| case KVM_CAP_PIT_STATE2: |
| case KVM_CAP_SET_IDENTITY_MAP_ADDR: |
| case KVM_CAP_XEN_HVM: |
| case KVM_CAP_ADJUST_CLOCK: |
| case KVM_CAP_VCPU_EVENTS: |
| case KVM_CAP_HYPERV: |
| case KVM_CAP_HYPERV_VAPIC: |
| case KVM_CAP_HYPERV_SPIN: |
| case KVM_CAP_PCI_SEGMENT: |
| case KVM_CAP_DEBUGREGS: |
| case KVM_CAP_X86_ROBUST_SINGLESTEP: |
| case KVM_CAP_XSAVE: |
| case KVM_CAP_ASYNC_PF: |
| case KVM_CAP_GET_TSC_KHZ: |
| r = 1; |
| break; |
| case KVM_CAP_COALESCED_MMIO: |
| r = KVM_COALESCED_MMIO_PAGE_OFFSET; |
| break; |
| case KVM_CAP_VAPIC: |
| r = !kvm_x86_ops->cpu_has_accelerated_tpr(); |
| break; |
| case KVM_CAP_NR_VCPUS: |
| r = KVM_SOFT_MAX_VCPUS; |
| break; |
| case KVM_CAP_MAX_VCPUS: |
| r = KVM_MAX_VCPUS; |
| break; |
| case KVM_CAP_NR_MEMSLOTS: |
| r = KVM_MEMORY_SLOTS; |
| break; |
| case KVM_CAP_PV_MMU: /* obsolete */ |
| r = 0; |
| break; |
| case KVM_CAP_IOMMU: |
| r = iommu_present(&pci_bus_type); |
| break; |
| case KVM_CAP_MCE: |
| r = KVM_MAX_MCE_BANKS; |
| break; |
| case KVM_CAP_XCRS: |
| r = cpu_has_xsave; |
| break; |
| case KVM_CAP_TSC_CONTROL: |
| r = kvm_has_tsc_control; |
| break; |
| case KVM_CAP_TSC_DEADLINE_TIMER: |
| r = boot_cpu_has(X86_FEATURE_TSC_DEADLINE_TIMER); |
| break; |
| default: |
| r = 0; |
| break; |
| } |
| return r; |
| |
| } |
| |
| long kvm_arch_dev_ioctl(struct file *filp, |
| unsigned int ioctl, unsigned long arg) |
| { |
| void __user *argp = (void __user *)arg; |
| long r; |
| |
| switch (ioctl) { |
| case KVM_GET_MSR_INDEX_LIST: { |
| struct kvm_msr_list __user *user_msr_list = argp; |
| struct kvm_msr_list msr_list; |
| unsigned n; |
| |
| r = -EFAULT; |
| if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list)) |
| goto out; |
| n = msr_list.nmsrs; |
| msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs); |
| if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list)) |
| goto out; |
| r = -E2BIG; |
| if (n < msr_list.nmsrs) |
| goto out; |
| r = -EFAULT; |
| if (copy_to_user(user_msr_list->indices, &msrs_to_save, |
| num_msrs_to_save * sizeof(u32))) |
| goto out; |
| if (copy_to_user(user_msr_list->indices + num_msrs_to_save, |
| &emulated_msrs, |
| ARRAY_SIZE(emulated_msrs) * sizeof(u32))) |
| goto out; |
| r = 0; |
| break; |
| } |
| case KVM_GET_SUPPORTED_CPUID: { |
| struct kvm_cpuid2 __user *cpuid_arg = argp; |
| struct kvm_cpuid2 cpuid; |
| |
| r = -EFAULT; |
| if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid)) |
| goto out; |
| r = kvm_dev_ioctl_get_supported_cpuid(&cpuid, |
| cpuid_arg->entries); |
| if (r) |
| goto out; |
| |
| r = -EFAULT; |
| if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid)) |
| goto out; |
| r = 0; |
| break; |
| } |
| case KVM_X86_GET_MCE_CAP_SUPPORTED: { |
| u64 mce_cap; |
| |
| mce_cap = KVM_MCE_CAP_SUPPORTED; |
| r = -EFAULT; |
| if (copy_to_user(argp, &mce_cap, sizeof mce_cap)) |
| goto out; |
| r = 0; |
| break; |
| } |
| default: |
| r = -EINVAL; |
| } |
| out: |
| return r; |
| } |
| |
| static void wbinvd_ipi(void *garbage) |
| { |
| wbinvd(); |
| } |
| |
| static bool need_emulate_wbinvd(struct kvm_vcpu *vcpu) |
| { |
| return vcpu->kvm->arch.iommu_domain && |
| !(vcpu->kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY); |
| } |
| |
| void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) |
| { |
| /* Address WBINVD may be executed by guest */ |
| if (need_emulate_wbinvd(vcpu)) { |
| if (kvm_x86_ops->has_wbinvd_exit()) |
| cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask); |
| else if (vcpu->cpu != -1 && vcpu->cpu != cpu) |
| smp_call_function_single(vcpu->cpu, |
| wbinvd_ipi, NULL, 1); |
| } |
| |
| kvm_x86_ops->vcpu_load(vcpu, cpu); |
| if (unlikely(vcpu->cpu != cpu) || check_tsc_unstable()) { |
| /* Make sure TSC doesn't go backwards */ |
| s64 tsc_delta; |
| u64 tsc; |
| |
| tsc = kvm_x86_ops->read_l1_tsc(vcpu); |
| tsc_delta = !vcpu->arch.last_guest_tsc ? 0 : |
| tsc - vcpu->arch.last_guest_tsc; |
| |
| if (tsc_delta < 0) |
| mark_tsc_unstable("KVM discovered backwards TSC"); |
| if (check_tsc_unstable()) { |
| kvm_x86_ops->adjust_tsc_offset(vcpu, -tsc_delta); |
| vcpu->arch.tsc_catchup = 1; |
| } |
| kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); |
| if (vcpu->cpu != cpu) |
| kvm_migrate_timers(vcpu); |
| vcpu->cpu = cpu; |
| } |
| |
| accumulate_steal_time(vcpu); |
| kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu); |
| } |
| |
| void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) |
| { |
| kvm_x86_ops->vcpu_put(vcpu); |
| kvm_put_guest_fpu(vcpu); |
| vcpu->arch.last_guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu); |
| } |
| |
| static int is_efer_nx(void) |
| { |
| unsigned long long efer = 0; |
| |
| rdmsrl_safe(MSR_EFER, &efer); |
| return efer & EFER_NX; |
| } |
| |
| static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu) |
| { |
| int i; |
| struct kvm_cpuid_entry2 *e, *entry; |
| |
| entry = NULL; |
| for (i = 0; i < vcpu->arch.cpuid_nent; ++i) { |
| e = &vcpu->arch.cpuid_entries[i]; |
| if (e->function == 0x80000001) { |
| entry = e; |
| break; |
| } |
| } |
| if (entry && (entry->edx & (1 << 20)) && !is_efer_nx()) { |
| entry->edx &= ~(1 << 20); |
| printk(KERN_INFO "kvm: guest NX capability removed\n"); |
| } |
| } |
| |
| /* when an old userspace process fills a new kernel module */ |
| static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu, |
| struct kvm_cpuid *cpuid, |
| struct kvm_cpuid_entry __user *entries) |
| { |
| int r, i; |
| struct kvm_cpuid_entry *cpuid_entries; |
| |
| r = -E2BIG; |
| if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) |
| goto out; |
| r = -ENOMEM; |
| cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * cpuid->nent); |
| if (!cpuid_entries) |
| goto out; |
| r = -EFAULT; |
| if (copy_from_user(cpuid_entries, entries, |
| cpuid->nent * sizeof(struct kvm_cpuid_entry))) |
| goto out_free; |
| for (i = 0; i < cpuid->nent; i++) { |
| vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function; |
| vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax; |
| vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx; |
| vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx; |
| vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx; |
| vcpu->arch.cpuid_entries[i].index = 0; |
| vcpu->arch.cpuid_entries[i].flags = 0; |
| vcpu->arch.cpuid_entries[i].padding[0] = 0; |
| vcpu->arch.cpuid_entries[i].padding[1] = 0; |
| vcpu->arch.cpuid_entries[i].padding[2] = 0; |
| } |
| vcpu->arch.cpuid_nent = cpuid->nent; |
| cpuid_fix_nx_cap(vcpu); |
| r = 0; |
| kvm_apic_set_version(vcpu); |
| kvm_x86_ops->cpuid_update(vcpu); |
| update_cpuid(vcpu); |
| |
| out_free: |
| vfree(cpuid_entries); |
| out: |
| return r; |
| } |
| |
| static int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu, |
| struct kvm_cpuid2 *cpuid, |
| struct kvm_cpuid_entry2 __user *entries) |
| { |
| int r; |
| |
| r = -E2BIG; |
| if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) |
| goto out; |
| r = -EFAULT; |
| if (copy_from_user(&vcpu->arch.cpuid_entries, entries, |
| cpuid->nent * sizeof(struct kvm_cpuid_entry2))) |
| goto out; |
| vcpu->arch.cpuid_nent = cpuid->nent; |
| kvm_apic_set_version(vcpu); |
| kvm_x86_ops->cpuid_update(vcpu); |
| update_cpuid(vcpu); |
| return 0; |
| |
| out: |
| return r; |
| } |
| |
| static int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu, |
| struct kvm_cpuid2 *cpuid, |
| struct kvm_cpuid_entry2 __user *entries) |
| { |
| int r; |
| |
| r = -E2BIG; |
| if (cpuid->nent < vcpu->arch.cpuid_nent) |
| goto out; |
| r = -EFAULT; |
| if (copy_to_user(entries, &vcpu->arch.cpuid_entries, |
| vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2))) |
| goto out; |
| return 0; |
| |
| out: |
| cpuid->nent = vcpu->arch.cpuid_nent; |
| return r; |
| } |
| |
| static void cpuid_mask(u32 *word, int wordnum) |
| { |
| *word &= boot_cpu_data.x86_capability[wordnum]; |
| } |
| |
| static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function, |
| u32 index) |
| { |
| entry->function = function; |
| entry->index = index; |
| cpuid_count(entry->function, entry->index, |
| &entry->eax, &entry->ebx, &entry->ecx, &entry->edx); |
| entry->flags = 0; |
| } |
| |
| static bool supported_xcr0_bit(unsigned bit) |
| { |
| u64 mask = ((u64)1 << bit); |
| |
| return mask & (XSTATE_FP | XSTATE_SSE | XSTATE_YMM) & host_xcr0; |
| } |
| |
| #define F(x) bit(X86_FEATURE_##x) |
| |
| static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, |
| u32 index, int *nent, int maxnent) |
| { |
| unsigned f_nx = is_efer_nx() ? F(NX) : 0; |
| #ifdef CONFIG_X86_64 |
| unsigned f_gbpages = (kvm_x86_ops->get_lpage_level() == PT_PDPE_LEVEL) |
| ? F(GBPAGES) : 0; |
| unsigned f_lm = F(LM); |
| #else |
| unsigned f_gbpages = 0; |
| unsigned f_lm = 0; |
| #endif |
| unsigned f_rdtscp = kvm_x86_ops->rdtscp_supported() ? F(RDTSCP) : 0; |
| |
| /* cpuid 1.edx */ |
| const u32 kvm_supported_word0_x86_features = |
| F(FPU) | F(VME) | F(DE) | F(PSE) | |
| F(TSC) | F(MSR) | F(PAE) | F(MCE) | |
| F(CX8) | F(APIC) | 0 /* Reserved */ | F(SEP) | |
| F(MTRR) | F(PGE) | F(MCA) | F(CMOV) | |
| F(PAT) | F(PSE36) | 0 /* PSN */ | F(CLFLSH) | |
| 0 /* Reserved, DS, ACPI */ | F(MMX) | |
| F(FXSR) | F(XMM) | F(XMM2) | F(SELFSNOOP) | |
| 0 /* HTT, TM, Reserved, PBE */; |
| /* cpuid 0x80000001.edx */ |
| const u32 kvm_supported_word1_x86_features = |
| F(FPU) | F(VME) | F(DE) | F(PSE) | |
| F(TSC) | F(MSR) | F(PAE) | F(MCE) | |
| F(CX8) | F(APIC) | 0 /* Reserved */ | F(SYSCALL) | |
| F(MTRR) | F(PGE) | F(MCA) | F(CMOV) | |
| F(PAT) | F(PSE36) | 0 /* Reserved */ | |
| f_nx | 0 /* Reserved */ | F(MMXEXT) | F(MMX) | |
| F(FXSR) | F(FXSR_OPT) | f_gbpages | f_rdtscp | |
| 0 /* Reserved */ | f_lm | F(3DNOWEXT) | F(3DNOW); |
| /* cpuid 1.ecx */ |
| const u32 kvm_supported_word4_x86_features = |
| F(XMM3) | F(PCLMULQDQ) | 0 /* DTES64, MONITOR */ | |
| 0 /* DS-CPL, VMX, SMX, EST */ | |
| 0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ | |
| 0 /* Reserved */ | F(CX16) | 0 /* xTPR Update, PDCM */ | |
| 0 /* Reserved, DCA */ | F(XMM4_1) | |
| F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) | |
| 0 /* Reserved*/ | F(AES) | F(XSAVE) | 0 /* OSXSAVE */ | F(AVX) | |
| F(F16C) | F(RDRAND); |
| /* cpuid 0x80000001.ecx */ |
| const u32 kvm_supported_word6_x86_features = |
| F(LAHF_LM) | F(CMP_LEGACY) | 0 /*SVM*/ | 0 /* ExtApicSpace */ | |
| F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) | |
| F(3DNOWPREFETCH) | 0 /* OSVW */ | 0 /* IBS */ | F(XOP) | |
| 0 /* SKINIT, WDT, LWP */ | F(FMA4) | F(TBM); |
| |
| /* cpuid 0xC0000001.edx */ |
| const u32 kvm_supported_word5_x86_features = |
| F(XSTORE) | F(XSTORE_EN) | F(XCRYPT) | F(XCRYPT_EN) | |
| F(ACE2) | F(ACE2_EN) | F(PHE) | F(PHE_EN) | |
| F(PMM) | F(PMM_EN); |
| |
| /* cpuid 7.0.ebx */ |
| const u32 kvm_supported_word9_x86_features = |
| F(SMEP) | F(FSGSBASE) | F(ERMS); |
| |
| /* all calls to cpuid_count() should be made on the same cpu */ |
| get_cpu(); |
| do_cpuid_1_ent(entry, function, index); |
| ++*nent; |
| |
| switch (function) { |
| case 0: |
| entry->eax = min(entry->eax, (u32)0xd); |
| break; |
| case 1: |
| entry->edx &= kvm_supported_word0_x86_features; |
| cpuid_mask(&entry->edx, 0); |
| entry->ecx &= kvm_supported_word4_x86_features; |
| cpuid_mask(&entry->ecx, 4); |
| /* we support x2apic emulation even if host does not support |
| * it since we emulate x2apic in software */ |
| entry->ecx |= F(X2APIC); |
| break; |
| /* function 2 entries are STATEFUL. That is, repeated cpuid commands |
| * may return different values. This forces us to get_cpu() before |
| * issuing the first command, and also to emulate this annoying behavior |
| * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */ |
| case 2: { |
| int t, times = entry->eax & 0xff; |
| |
| entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC; |
| entry->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT; |
| for (t = 1; t < times && *nent < maxnent; ++t) { |
| do_cpuid_1_ent(&entry[t], function, 0); |
| entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC; |
| ++*nent; |
| } |
| break; |
| } |
| /* function 4 has additional index. */ |
| case 4: { |
| int i, cache_type; |
| |
| entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |
| /* read more entries until cache_type is zero */ |
| for (i = 1; *nent < maxnent; ++i) { |
| cache_type = entry[i - 1].eax & 0x1f; |
| if (!cache_type) |
| break; |
| do_cpuid_1_ent(&entry[i], function, i); |
| entry[i].flags |= |
| KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |
| ++*nent; |
| } |
| break; |
| } |
| case 7: { |
| entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |
| /* Mask ebx against host capbability word 9 */ |
| if (index == 0) { |
| entry->ebx &= kvm_supported_word9_x86_features; |
| cpuid_mask(&entry->ebx, 9); |
| } else |
| entry->ebx = 0; |
| entry->eax = 0; |
| entry->ecx = 0; |
| entry->edx = 0; |
| break; |
| } |
| case 9: |
| break; |
| /* function 0xb has additional index. */ |
| case 0xb: { |
| int i, level_type; |
| |
| entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |
| /* read more entries until level_type is zero */ |
| for (i = 1; *nent < maxnent; ++i) { |
| level_type = entry[i - 1].ecx & 0xff00; |
| if (!level_type) |
| break; |
| do_cpuid_1_ent(&entry[i], function, i); |
| entry[i].flags |= |
| KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |
| ++*nent; |
| } |
| break; |
| } |
| case 0xd: { |
| int idx, i; |
| |
| entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |
| for (idx = 1, i = 1; *nent < maxnent && idx < 64; ++idx) { |
| do_cpuid_1_ent(&entry[i], function, idx); |
| if (entry[i].eax == 0 || !supported_xcr0_bit(idx)) |
| continue; |
| entry[i].flags |= |
| KVM_CPUID_FLAG_SIGNIFCANT_INDEX; |
| ++*nent; |
| ++i; |
| } |
| break; |
| } |
| case KVM_CPUID_SIGNATURE: { |
| char signature[12] = "KVMKVMKVM\0\0"; |
| u32 *sigptr = (u32 *)signature; |
| entry->eax = 0; |
| entry->ebx = sigptr[0]; |
| entry->ecx = sigptr[1]; |
| entry->edx = sigptr[2]; |
| break; |
| } |
| case KVM_CPUID_FEATURES: |
| entry->eax = (1 << KVM_FEATURE_CLOCKSOURCE) | |
| (1 << KVM_FEATURE_NOP_IO_DELAY) | |
| (1 << KVM_FEATURE_CLOCKSOURCE2) | |
| (1 << KVM_FEATURE_ASYNC_PF) | |
| (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT); |
| |
| if (sched_info_on()) |
| entry->eax |= (1 << KVM_FEATURE_STEAL_TIME); |
| |
| entry->ebx = 0; |
| entry->ecx = 0; |
| entry->edx = 0; |
| break; |
| case 0x80000000: |
| entry->eax = min(entry->eax, 0x8000001a); |
| break; |
| case 0x80000001: |
| entry->edx &= kvm_supported_word1_x86_features; |
| cpuid_mask(&entry->edx, 1); |
| entry->ecx &= kvm_supported_word6_x86_features; |
| cpuid_mask(&entry->ecx, 6); |
| break; |
| case 0x80000008: { |
| unsigned g_phys_as = (entry->eax >> 16) & 0xff; |
| unsigned virt_as = max((entry->eax >> 8) & 0xff, 48U); |
| unsigned phys_as = entry->eax & 0xff; |
| |
| if (!g_phys_as) |
| g_phys_as = phys_as; |
| entry->eax = g_phys_as | (virt_as << 8); |
| entry->ebx = entry->edx = 0; |
| break; |
| } |
| case 0x80000019: |
| entry->ecx = entry->edx = 0; |
| break; |
| case 0x8000001a: |
| break; |
| case 0x8000001d: |
| break; |
| /*Add support for Centaur's CPUID instruction*/ |
| case 0xC0000000: |
| /*Just support up to 0xC0000004 now*/ |
| entry->eax = min(entry->eax, 0xC0000004); |
| break; |
| case 0xC0000001: |
| entry->edx &= kvm_supported_word5_x86_features; |
| cpuid_mask(&entry->edx, 5); |
| break; |
| case 3: /* Processor serial number */ |
| case 5: /* MONITOR/MWAIT */ |
| case 6: /* Thermal management */ |
| case 0xA: /* Architectural Performance Monitoring */ |
| case 0x80000007: /* Advanced power management */ |
| case 0xC0000002: |
| case 0xC0000003: |
| case 0xC0000004: |
| default: |
| entry->eax = entry->ebx = entry->ecx = entry->edx = 0; |
| break; |
| } |
| |
| kvm_x86_ops->set_supported_cpuid(function, entry); |
| |
| put_cpu(); |
| } |
| |
| #undef F |
| |
| static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid, |
| struct kvm_cpuid_entry2 __user *entries) |
| { |
| struct kvm_cpuid_entry2 *cpuid_entries; |
| int limit, nent = 0, r = -E2BIG; |
| u32 func; |
| |
| if (cpuid->nent < 1) |
| goto out; |
| if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) |
| cpuid->nent = KVM_MAX_CPUID_ENTRIES; |
| r = -ENOMEM; |
| cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent); |
| if (!cpuid_entries) |
| goto out; |
| |
| do_cpuid_ent(&cpuid_entries[0], 0, 0, &nent, cpuid->nent); |
| limit = cpuid_entries[0].eax; |
| for (func = 1; func <= limit && nent < cpuid->nent; ++func) |
| do_cpuid_ent(&cpuid_entries[nent], func, 0, |
| &nent, cpuid->nent); |
| r = -E2BIG; |
| if (nent >= cpuid->nent) |
| goto out_free; |
| |
| do_cpuid_ent(&cpuid_entries[nent], 0x80000000, 0, &nent, cpuid->nent); |
| limit = cpuid_entries[nent - 1].eax; |
| for (func = 0x80000001; func <= limit && nent < cpuid->nent; ++func) |
| do_cpuid_ent(&cpuid_entries[nent], func, 0, |
| &nent, cpuid->nent); |
| |
| |
| |
| r = -E2BIG; |
| if (nent >= cpuid->nent) |
| goto out_free; |
| |
| /* Add support for Centaur's CPUID instruction. */ |
| if (boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR) { |
| do_cpuid_ent(&cpuid_entries[nent], 0xC0000000, 0, |
| &nent, cpuid->nent); |
| |
| r = -E2BIG; |
| if (nent >= cpuid->nent) |
| goto out_free; |
| |
| limit = cpuid_entries[nent - 1].eax; |
| for (func = 0xC0000001; |
| func <= limit && nent < cpuid->nent; ++func) |
| do_cpuid_ent(&cpuid_entries[nent], func, 0, |
| &nent, cpuid->nent); |
| |
| r = -E2BIG; |
| if (nent >= cpuid->nent) |
| goto out_free; |
| } |
| |
| do_cpuid_ent(&cpuid_entries[nent], KVM_CPUID_SIGNATURE, 0, &nent, |
| cpuid->nent); |
| |
| r = -E2BIG; |
| if (nent >= cpuid->nent) |
| goto out_free; |
| |
| do_cpuid_ent(&cpuid_entries[nent], KVM_CPUID_FEATURES, 0, &nent, |
| cpuid->nent); |
| |
| r = -E2BIG; |
| if (nent >= cpuid->nent) |
| goto out_free; |
| |
| r = -EFAULT; |
| if (copy_to_user(entries, cpuid_entries, |
| nent * sizeof(struct kvm_cpuid_entry2))) |
| goto out_free; |
| cpuid->nent = nent; |
| r = 0; |
| |
| out_free: |
| vfree(cpuid_entries); |
| out: |
| return r; |
| } |
| |
| static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu, |
| struct kvm_lapic_state *s) |
| { |
| memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s); |
| |
| return 0; |
| } |
| |
| static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu, |
| struct kvm_lapic_state *s) |
| { |
| memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s); |
| kvm_apic_post_state_restore(vcpu); |
| update_cr8_intercept(vcpu); |
| |
| return 0; |
| } |
| |
| static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, |
| struct kvm_interrupt *irq) |
| { |
| if (irq->irq < 0 || irq->irq >= 256) |
| return -EINVAL; |
| if (irqchip_in_kernel(vcpu->kvm)) |
| return -ENXIO; |
| |
| kvm_queue_interrupt(vcpu, irq->irq, false); |
| kvm_make_request(KVM_REQ_EVENT, vcpu); |
| |
| return 0; |
| } |
| |
| static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu) |
| { |
| kvm_inject_nmi(vcpu); |
| |
| return 0; |
| } |
| |
| static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu, |
| struct kvm_tpr_access_ctl *tac) |
| { |
| if (tac->flags) |
| return -EINVAL; |
| vcpu->arch.tpr_access_reporting = !!tac->enabled; |
| return 0; |
| } |
| |
| static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu, |
| u64 mcg_cap) |
| { |
| int r; |
| unsigned bank_num = mcg_cap & 0xff, bank; |
| |
| r = -EINVAL; |
| if (!bank_num || bank_num >= KVM_MAX_MCE_BANKS) |
| goto out; |
| if (mcg_cap & ~(KVM_MCE_CAP_SUPPORTED | 0xff | 0xff0000)) |
| goto out; |
| r = 0; |
| vcpu->arch.mcg_cap = mcg_cap; |
| /* Init IA32_MCG_CTL to all 1s */ |
| if (mcg_cap & MCG_CTL_P) |
| vcpu->arch.mcg_ctl = ~(u64)0; |
| /* Init IA32_MCi_CTL to all 1s */ |
| for (bank = 0; bank < bank_num; bank++) |
| vcpu->arch.mce_banks[bank*4] = ~(u64)0; |
| out: |
| return r; |
| } |
| |
| static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu, |
| struct kvm_x86_mce *mce) |
| { |
| u64 mcg_cap = vcpu->arch.mcg_cap; |
| unsigned bank_num = mcg_cap & 0xff; |
| u64 *banks = vcpu->arch.mce_banks; |
| |
| if (mce->bank >= bank_num || !(mce->status & MCI_STATUS_VAL)) |
| return -EINVAL; |
| /* |
| * if IA32_MCG_CTL is not all 1s, the uncorrected error |
| * reporting is disabled |
| */ |
| if ((mce->status & MCI_STATUS_UC) && (mcg_cap & MCG_CTL_P) && |
| vcpu->arch.mcg_ctl != ~(u64)0) |
| return 0; |
| banks += 4 * mce->bank; |
| /* |
| * if IA32_MCi_CTL is not all 1s, the uncorrected error |
| * reporting is disabled for the bank |
| */ |
| if ((mce->status & MCI_STATUS_UC) && banks[0] != ~(u64)0) |
| return 0; |
| if (mce->status & MCI_STATUS_UC) { |
| if ((vcpu->arch.mcg_status & MCG_STATUS_MCIP) || |
| !kvm_read_cr4_bits(vcpu, X86_CR4_MCE)) { |
| kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); |
| return 0; |
| } |
| if (banks[1] & MCI_STATUS_VAL) |
| mce->status |= MCI_STATUS_OVER; |
| banks[2] = mce->addr; |
| banks[3] = mce->misc; |
| vcpu->arch.mcg_status = mce->mcg_status; |
| banks[1] = mce->status; |
| kvm_queue_exception(vcpu, MC_VECTOR); |
| } else if (!(banks[1] & MCI_STATUS_VAL) |
| || !(banks[1] & MCI_STATUS_UC)) { |
| if (banks[1] & MCI_STATUS_VAL) |
| mce->status |= MCI_STATUS_OVER; |
| banks[2] = mce->addr; |
| banks[3] = mce->misc; |
| banks[1] = mce->status; |
| } else |
| banks[1] |= MCI_STATUS_OVER; |
| return 0; |
| } |
| |
| static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu, |
| struct kvm_vcpu_events *events) |
| { |
| process_nmi(vcpu); |
| events->exception.injected = |
| vcpu->arch.exception.pending && |
| !kvm_exception_is_soft(vcpu->arch.exception.nr); |
| events->exception.nr = vcpu->arch.exception.nr; |
| events->exception.has_error_code = vcpu->arch.exception.has_error_code; |
| events->exception.pad = 0; |
| events->exception.error_code = vcpu->arch.exception.error_code; |
| |
| events->interrupt.injected = |
| vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft; |
| events->interrupt.nr = vcpu->arch.interrupt.nr; |
| events->interrupt.soft = 0; |
| events->interrupt.shadow = |
| kvm_x86_ops->get_interrupt_shadow(vcpu, |
| KVM_X86_SHADOW_INT_MOV_SS | KVM_X86_SHADOW_INT_STI); |
| |
| events->nmi.injected = vcpu->arch.nmi_injected; |
| events->nmi.pending = vcpu->arch.nmi_pending != 0; |
| events->nmi.masked = kvm_x86_ops->get_nmi_mask(vcpu); |
| events->nmi.pad = 0; |
| |
| events->sipi_vector = vcpu->arch.sipi_vector; |
| |
| events->flags = (KVM_VCPUEVENT_VALID_NMI_PENDING |
| | KVM_VCPUEVENT_VALID_SIPI_VECTOR |
| | KVM_VCPUEVENT_VALID_SHADOW); |
| memset(&events->reserved, 0, sizeof(events->reserved)); |
| } |
| |
| static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu, |
| struct kvm_vcpu_events *events) |
| { |
| if (events->flags & ~(KVM_VCPUEVENT_VALID_NMI_PENDING |
| | KVM_VCPUEVENT_VALID_SIPI_VECTOR |
| | KVM_VCPUEVENT_VALID_SHADOW)) |
| return -EINVAL; |
| |
| process_nmi(vcpu); |
| vcpu->arch.exception.pending = events->exception.injected; |
| vcpu->arch.exception.nr = events->exception.nr; |
| vcpu->arch.exception.has_error_code = events->exception.has_error_code; |
| vcpu->arch.exception.error_code = events->exception.error_code; |
| |
| vcpu->arch.interrupt.pending = events->interrupt.injected; |
| vcpu->arch.interrupt.nr = events->interrupt.nr; |
| vcpu->arch.interrupt.soft = events->interrupt.soft; |
| if (events->flags & KVM_VCPUEVENT_VALID_SHADOW) |
| kvm_x86_ops->set_interrupt_shadow(vcpu, |
| events->interrupt.shadow); |
| |
| vcpu->arch.nmi_injected = events->nmi.injected; |
| if (events->flags & KVM_VCPUEVENT_VALID_NMI_PENDING) |
| vcpu->arch.nmi_pending = events->nmi.pending; |
| kvm_x86_ops->set_nmi_mask(vcpu, events->nmi.masked); |
| |
| if (events->flags & KVM_VCPUEVENT_VALID_SIPI_VECTOR) |
| vcpu->arch.sipi_vector = events->sipi_vector; |
| |
| kvm_make_request(KVM_REQ_EVENT, vcpu); |
| |
| return 0; |
| } |
| |
| static void kvm_vcpu_ioctl_x86_get_debugregs(struct kvm_vcpu *vcpu, |
| struct kvm_debugregs *dbgregs) |
| { |
| memcpy(dbgregs->db, vcpu->arch.db, sizeof(vcpu->arch.db)); |
| dbgregs->dr6 = vcpu->arch.dr6; |
| dbgregs->dr7 = vcpu->arch.dr7; |
| dbgregs->flags = 0; |
| memset(&dbgregs->reserved, 0, sizeof(dbgregs->reserved)); |
| } |
| |
| static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu *vcpu, |
| struct kvm_debugregs *dbgregs) |
| { |
| if (dbgregs->flags) |
| return -EINVAL; |
| |
| memcpy(vcpu->arch.db, dbgregs->db, sizeof(vcpu->arch.db)); |
| vcpu->arch.dr6 = dbgregs->dr6; |
| vcpu->arch.dr7 = dbgregs->dr7; |
| |
| return 0; |
| } |
| |
| static void kvm_vcpu_ioctl_x86_get_xsave(struct kvm_vcpu *vcpu, |
| struct kvm_xsave *guest_xsave) |
| { |
| if (cpu_has_xsave) |
| memcpy(guest_xsave->region, |
| &vcpu->arch.guest_fpu.state->xsave, |
| xstate_size); |
| else { |
| memcpy(guest_xsave->region, |
| &vcpu->arch.guest_fpu.state->fxsave, |
| sizeof(struct i387_fxsave_struct)); |
| *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSE
|