virt/kvm/arm/vgic-v3.c - kernel/quantenna - Git at Google

 /*
  * Copyright (C) 2013 ARM Limited, All Rights Reserved.
  * Author: Marc Zyngier <marc.zyngier@arm.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */

 #include <linux/cpu.h>
 #include <linux/kvm.h>
 #include <linux/kvm_host.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>

 #include <linux/irqchip/arm-gic-v3.h>
 #include <linux/irqchip/arm-gic-common.h>

 #include <asm/kvm_emulate.h>
 #include <asm/kvm_arm.h>
 #include <asm/kvm_asm.h>
 #include <asm/kvm_mmu.h>

 static u32 ich_vtr_el2;

 static struct vgic_lr vgic_v3_get_lr(const struct kvm_vcpu *vcpu, int lr)
 {
 	struct vgic_lr lr_desc;
 	u64 val = vcpu->arch.vgic_cpu.vgic_v3.vgic_lr[lr];

 	if (vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3)
 		lr_desc.irq = val & ICH_LR_VIRTUAL_ID_MASK;
 	else
 		lr_desc.irq = val & GICH_LR_VIRTUALID;

 	lr_desc.source = 0;
 	if (lr_desc.irq <= 15 &&
 	    vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V2)
 		lr_desc.source = (val >> GICH_LR_PHYSID_CPUID_SHIFT) & 0x7;

 	lr_desc.state = 0;

 	if (val & ICH_LR_PENDING_BIT)
 		lr_desc.state |= LR_STATE_PENDING;
 	if (val & ICH_LR_ACTIVE_BIT)
 		lr_desc.state |= LR_STATE_ACTIVE;
 	if (val & ICH_LR_EOI)
 		lr_desc.state |= LR_EOI_INT;
 	if (val & ICH_LR_HW) {
 		lr_desc.state |= LR_HW;
 		lr_desc.hwirq = (val >> ICH_LR_PHYS_ID_SHIFT) & GENMASK(9, 0);
 	}

 	return lr_desc;
 }

 static void vgic_v3_set_lr(struct kvm_vcpu *vcpu, int lr,
 			   struct vgic_lr lr_desc)
 {
 	u64 lr_val;

 	lr_val = lr_desc.irq;

 	/*
 	 * Currently all guest IRQs are Group1, as Group0 would result
 	 * in a FIQ in the guest, which it wouldn't expect.
 	 * Eventually we want to make this configurable, so we may revisit
 	 * this in the future.
 	 */
 	switch (vcpu->kvm->arch.vgic.vgic_model) {
 	case KVM_DEV_TYPE_ARM_VGIC_V3:
 		lr_val |= ICH_LR_GROUP;
 		break;
 	case  KVM_DEV_TYPE_ARM_VGIC_V2:
 		if (lr_desc.irq < VGIC_NR_SGIS)
 			lr_val |= (u32)lr_desc.source << GICH_LR_PHYSID_CPUID_SHIFT;
 		break;
 	default:
 		BUG();
 	}

 	if (lr_desc.state & LR_STATE_PENDING)
 		lr_val |= ICH_LR_PENDING_BIT;
 	if (lr_desc.state & LR_STATE_ACTIVE)
 		lr_val |= ICH_LR_ACTIVE_BIT;
 	if (lr_desc.state & LR_EOI_INT)
 		lr_val |= ICH_LR_EOI;
 	if (lr_desc.state & LR_HW) {
 		lr_val |= ICH_LR_HW;
 		lr_val |= ((u64)lr_desc.hwirq) << ICH_LR_PHYS_ID_SHIFT;
 	}

 	vcpu->arch.vgic_cpu.vgic_v3.vgic_lr[lr] = lr_val;

 	if (!(lr_desc.state & LR_STATE_MASK))
 		vcpu->arch.vgic_cpu.vgic_v3.vgic_elrsr |= (1U << lr);
 	else
 		vcpu->arch.vgic_cpu.vgic_v3.vgic_elrsr &= ~(1U << lr);
 }

 static u64 vgic_v3_get_elrsr(const struct kvm_vcpu *vcpu)
 {
 	return vcpu->arch.vgic_cpu.vgic_v3.vgic_elrsr;
 }

 static u64 vgic_v3_get_eisr(const struct kvm_vcpu *vcpu)
 {
 	return vcpu->arch.vgic_cpu.vgic_v3.vgic_eisr;
 }

 static void vgic_v3_clear_eisr(struct kvm_vcpu *vcpu)
 {
 	vcpu->arch.vgic_cpu.vgic_v3.vgic_eisr = 0;
 }

 static u32 vgic_v3_get_interrupt_status(const struct kvm_vcpu *vcpu)
 {
 	u32 misr = vcpu->arch.vgic_cpu.vgic_v3.vgic_misr;
 	u32 ret = 0;

 	if (misr & ICH_MISR_EOI)
 		ret |= INT_STATUS_EOI;
 	if (misr & ICH_MISR_U)
 		ret |= INT_STATUS_UNDERFLOW;

 	return ret;
 }

 static void vgic_v3_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp)
 {
 	u32 vmcr = vcpu->arch.vgic_cpu.vgic_v3.vgic_vmcr;

 	vmcrp->ctlr = (vmcr & ICH_VMCR_CTLR_MASK) >> ICH_VMCR_CTLR_SHIFT;
 	vmcrp->abpr = (vmcr & ICH_VMCR_BPR1_MASK) >> ICH_VMCR_BPR1_SHIFT;
 	vmcrp->bpr  = (vmcr & ICH_VMCR_BPR0_MASK) >> ICH_VMCR_BPR0_SHIFT;
 	vmcrp->pmr  = (vmcr & ICH_VMCR_PMR_MASK) >> ICH_VMCR_PMR_SHIFT;
 }

 static void vgic_v3_enable_underflow(struct kvm_vcpu *vcpu)
 {
 	vcpu->arch.vgic_cpu.vgic_v3.vgic_hcr |= ICH_HCR_UIE;
 }

 static void vgic_v3_disable_underflow(struct kvm_vcpu *vcpu)
 {
 	vcpu->arch.vgic_cpu.vgic_v3.vgic_hcr &= ~ICH_HCR_UIE;
 }

 static void vgic_v3_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp)
 {
 	u32 vmcr;

 	vmcr  = (vmcrp->ctlr << ICH_VMCR_CTLR_SHIFT) & ICH_VMCR_CTLR_MASK;
 	vmcr |= (vmcrp->abpr << ICH_VMCR_BPR1_SHIFT) & ICH_VMCR_BPR1_MASK;
 	vmcr |= (vmcrp->bpr << ICH_VMCR_BPR0_SHIFT) & ICH_VMCR_BPR0_MASK;
 	vmcr |= (vmcrp->pmr << ICH_VMCR_PMR_SHIFT) & ICH_VMCR_PMR_MASK;

 	vcpu->arch.vgic_cpu.vgic_v3.vgic_vmcr = vmcr;
 }

 static void vgic_v3_enable(struct kvm_vcpu *vcpu)
 {
 	struct vgic_v3_cpu_if *vgic_v3 = &vcpu->arch.vgic_cpu.vgic_v3;

 	/*
 	 * By forcing VMCR to zero, the GIC will restore the binary
 	 * points to their reset values. Anything else resets to zero
 	 * anyway.
 	 */
 	vgic_v3->vgic_vmcr = 0;
 	vgic_v3->vgic_elrsr = ~0;

 	/*
 	 * If we are emulating a GICv3, we do it in an non-GICv2-compatible
 	 * way, so we force SRE to 1 to demonstrate this to the guest.
 	 * This goes with the spec allowing the value to be RAO/WI.
 	 */
 	if (vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3)
 		vgic_v3->vgic_sre = ICC_SRE_EL1_SRE;
 	else
 		vgic_v3->vgic_sre = 0;

 	/* Get the show on the road... */
 	vgic_v3->vgic_hcr = ICH_HCR_EN;
 }

 static const struct vgic_ops vgic_v3_ops = {
 	.get_lr			= vgic_v3_get_lr,
 	.set_lr			= vgic_v3_set_lr,
 	.get_elrsr		= vgic_v3_get_elrsr,
 	.get_eisr		= vgic_v3_get_eisr,
 	.clear_eisr		= vgic_v3_clear_eisr,
 	.get_interrupt_status	= vgic_v3_get_interrupt_status,
 	.enable_underflow	= vgic_v3_enable_underflow,
 	.disable_underflow	= vgic_v3_disable_underflow,
 	.get_vmcr		= vgic_v3_get_vmcr,
 	.set_vmcr		= vgic_v3_set_vmcr,
 	.enable			= vgic_v3_enable,
 };

 static struct vgic_params vgic_v3_params;

 static void vgic_cpu_init_lrs(void *params)
 {
 	kvm_call_hyp(__vgic_v3_init_lrs);
 }

 /**
  * vgic_v3_probe - probe for a GICv3 compatible interrupt controller
  * @gic_kvm_info:	pointer to the GIC description
  * @ops:		address of a pointer to the GICv3 operations
  * @params:		address of a pointer to HW-specific parameters
  *
  * Returns 0 if a GICv3 has been found, with the low level operations
  * in *ops and the HW parameters in *params. Returns an error code
  * otherwise.
  */
 int vgic_v3_probe(const struct gic_kvm_info *gic_kvm_info,
 		  const struct vgic_ops **ops,
 		  const struct vgic_params **params)
 {
 	int ret = 0;
 	struct vgic_params *vgic = &vgic_v3_params;
 	const struct resource *vcpu_res = &gic_kvm_info->vcpu;

 	vgic->maint_irq = gic_kvm_info->maint_irq;

 	ich_vtr_el2 = kvm_call_hyp(__vgic_v3_get_ich_vtr_el2);

 	/*
 	 * The ListRegs field is 5 bits, but there is a architectural
 	 * maximum of 16 list registers. Just ignore bit 4...
 	 */
 	vgic->nr_lr = (ich_vtr_el2 & 0xf) + 1;
 	vgic->can_emulate_gicv2 = false;

 	if (!vcpu_res->start) {
 		kvm_info("GICv3: no GICV resource entry\n");
 		vgic->vcpu_base = 0;
 	} else if (!PAGE_ALIGNED(vcpu_res->start)) {
 		pr_warn("GICV physical address 0x%llx not page aligned\n",
 			(unsigned long long)vcpu_res->start);
 		vgic->vcpu_base = 0;
 	} else if (!PAGE_ALIGNED(resource_size(vcpu_res))) {
 		pr_warn("GICV size 0x%llx not a multiple of page size 0x%lx\n",
 			(unsigned long long)resource_size(vcpu_res),
 			PAGE_SIZE);
 	} else {
 		vgic->vcpu_base = vcpu_res->start;
 		vgic->can_emulate_gicv2 = true;
 		kvm_register_device_ops(&kvm_arm_vgic_v2_ops,
 					KVM_DEV_TYPE_ARM_VGIC_V2);
 	}
 	if (vgic->vcpu_base == 0)
 		kvm_info("disabling GICv2 emulation\n");
 	kvm_register_device_ops(&kvm_arm_vgic_v3_ops, KVM_DEV_TYPE_ARM_VGIC_V3);

 	vgic->vctrl_base = NULL;
 	vgic->type = VGIC_V3;
 	vgic->max_gic_vcpus = VGIC_V3_MAX_CPUS;

 	kvm_info("GICV base=0x%llx, IRQ=%d\n",
 		 vgic->vcpu_base, vgic->maint_irq);

 	on_each_cpu(vgic_cpu_init_lrs, vgic, 1);

 	*ops = &vgic_v3_ops;
 	*params = vgic;

 	return ret;
 }
	/*
	* Copyright (C) 2013 ARM Limited, All Rights Reserved.
	* Author: Marc Zyngier <marc.zyngier@arm.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*/

	#include <linux/cpu.h>
	#include <linux/kvm.h>
	#include <linux/kvm_host.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>

	#include <linux/irqchip/arm-gic-v3.h>
	#include <linux/irqchip/arm-gic-common.h>

	#include <asm/kvm_emulate.h>
	#include <asm/kvm_arm.h>
	#include <asm/kvm_asm.h>
	#include <asm/kvm_mmu.h>

	static u32 ich_vtr_el2;

	static struct vgic_lr vgic_v3_get_lr(const struct kvm_vcpu *vcpu, int lr)
	{
	struct vgic_lr lr_desc;
	u64 val = vcpu->arch.vgic_cpu.vgic_v3.vgic_lr[lr];

	if (vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3)
	lr_desc.irq = val & ICH_LR_VIRTUAL_ID_MASK;
	else
	lr_desc.irq = val & GICH_LR_VIRTUALID;

	lr_desc.source = 0;
	if (lr_desc.irq <= 15 &&
	vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V2)
	lr_desc.source = (val >> GICH_LR_PHYSID_CPUID_SHIFT) & 0x7;

	lr_desc.state = 0;

	if (val & ICH_LR_PENDING_BIT)
	lr_desc.state \|= LR_STATE_PENDING;
	if (val & ICH_LR_ACTIVE_BIT)
	lr_desc.state \|= LR_STATE_ACTIVE;
	if (val & ICH_LR_EOI)
	lr_desc.state \|= LR_EOI_INT;
	if (val & ICH_LR_HW) {
	lr_desc.state \|= LR_HW;
	lr_desc.hwirq = (val >> ICH_LR_PHYS_ID_SHIFT) & GENMASK(9, 0);
	}

	return lr_desc;
	}

	static void vgic_v3_set_lr(struct kvm_vcpu *vcpu, int lr,
	struct vgic_lr lr_desc)
	{
	u64 lr_val;

	lr_val = lr_desc.irq;

	/*
	* Currently all guest IRQs are Group1, as Group0 would result
	* in a FIQ in the guest, which it wouldn't expect.
	* Eventually we want to make this configurable, so we may revisit
	* this in the future.
	*/
	switch (vcpu->kvm->arch.vgic.vgic_model) {
	case KVM_DEV_TYPE_ARM_VGIC_V3:
	lr_val \|= ICH_LR_GROUP;
	break;
	case KVM_DEV_TYPE_ARM_VGIC_V2:
	if (lr_desc.irq < VGIC_NR_SGIS)
	lr_val \|= (u32)lr_desc.source << GICH_LR_PHYSID_CPUID_SHIFT;
	break;
	default:
	BUG();
	}

	if (lr_desc.state & LR_STATE_PENDING)
	lr_val \|= ICH_LR_PENDING_BIT;
	if (lr_desc.state & LR_STATE_ACTIVE)
	lr_val \|= ICH_LR_ACTIVE_BIT;
	if (lr_desc.state & LR_EOI_INT)
	lr_val \|= ICH_LR_EOI;
	if (lr_desc.state & LR_HW) {
	lr_val \|= ICH_LR_HW;
	lr_val \|= ((u64)lr_desc.hwirq) << ICH_LR_PHYS_ID_SHIFT;
	}

	vcpu->arch.vgic_cpu.vgic_v3.vgic_lr[lr] = lr_val;

	if (!(lr_desc.state & LR_STATE_MASK))
	vcpu->arch.vgic_cpu.vgic_v3.vgic_elrsr \|= (1U << lr);
	else
	vcpu->arch.vgic_cpu.vgic_v3.vgic_elrsr &= ~(1U << lr);
	}

	static u64 vgic_v3_get_elrsr(const struct kvm_vcpu *vcpu)
	{
	return vcpu->arch.vgic_cpu.vgic_v3.vgic_elrsr;
	}

	static u64 vgic_v3_get_eisr(const struct kvm_vcpu *vcpu)
	{
	return vcpu->arch.vgic_cpu.vgic_v3.vgic_eisr;
	}

	static void vgic_v3_clear_eisr(struct kvm_vcpu *vcpu)
	{
	vcpu->arch.vgic_cpu.vgic_v3.vgic_eisr = 0;
	}

	static u32 vgic_v3_get_interrupt_status(const struct kvm_vcpu *vcpu)
	{
	u32 misr = vcpu->arch.vgic_cpu.vgic_v3.vgic_misr;
	u32 ret = 0;

	if (misr & ICH_MISR_EOI)
	ret \|= INT_STATUS_EOI;
	if (misr & ICH_MISR_U)
	ret \|= INT_STATUS_UNDERFLOW;

	return ret;
	}

	static void vgic_v3_get_vmcr(struct kvm_vcpu vcpu, struct vgic_vmcr vmcrp)
	{
	u32 vmcr = vcpu->arch.vgic_cpu.vgic_v3.vgic_vmcr;

	vmcrp->ctlr = (vmcr & ICH_VMCR_CTLR_MASK) >> ICH_VMCR_CTLR_SHIFT;
	vmcrp->abpr = (vmcr & ICH_VMCR_BPR1_MASK) >> ICH_VMCR_BPR1_SHIFT;
	vmcrp->bpr = (vmcr & ICH_VMCR_BPR0_MASK) >> ICH_VMCR_BPR0_SHIFT;
	vmcrp->pmr = (vmcr & ICH_VMCR_PMR_MASK) >> ICH_VMCR_PMR_SHIFT;
	}

	static void vgic_v3_enable_underflow(struct kvm_vcpu *vcpu)
	{
	vcpu->arch.vgic_cpu.vgic_v3.vgic_hcr \|= ICH_HCR_UIE;
	}

	static void vgic_v3_disable_underflow(struct kvm_vcpu *vcpu)
	{
	vcpu->arch.vgic_cpu.vgic_v3.vgic_hcr &= ~ICH_HCR_UIE;
	}

	static void vgic_v3_set_vmcr(struct kvm_vcpu vcpu, struct vgic_vmcr vmcrp)
	{
	u32 vmcr;

	vmcr = (vmcrp->ctlr << ICH_VMCR_CTLR_SHIFT) & ICH_VMCR_CTLR_MASK;
	vmcr \|= (vmcrp->abpr << ICH_VMCR_BPR1_SHIFT) & ICH_VMCR_BPR1_MASK;
	vmcr \|= (vmcrp->bpr << ICH_VMCR_BPR0_SHIFT) & ICH_VMCR_BPR0_MASK;
	vmcr \|= (vmcrp->pmr << ICH_VMCR_PMR_SHIFT) & ICH_VMCR_PMR_MASK;

	vcpu->arch.vgic_cpu.vgic_v3.vgic_vmcr = vmcr;
	}

	static void vgic_v3_enable(struct kvm_vcpu *vcpu)
	{
	struct vgic_v3_cpu_if *vgic_v3 = &vcpu->arch.vgic_cpu.vgic_v3;

	/*
	* By forcing VMCR to zero, the GIC will restore the binary
	* points to their reset values. Anything else resets to zero
	* anyway.
	*/
	vgic_v3->vgic_vmcr = 0;
	vgic_v3->vgic_elrsr = ~0;

	/*
	* If we are emulating a GICv3, we do it in an non-GICv2-compatible
	* way, so we force SRE to 1 to demonstrate this to the guest.
	* This goes with the spec allowing the value to be RAO/WI.
	*/
	if (vcpu->kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3)
	vgic_v3->vgic_sre = ICC_SRE_EL1_SRE;
	else
	vgic_v3->vgic_sre = 0;

	/* Get the show on the road... */
	vgic_v3->vgic_hcr = ICH_HCR_EN;
	}

	static const struct vgic_ops vgic_v3_ops = {
	.get_lr = vgic_v3_get_lr,
	.set_lr = vgic_v3_set_lr,
	.get_elrsr = vgic_v3_get_elrsr,
	.get_eisr = vgic_v3_get_eisr,
	.clear_eisr = vgic_v3_clear_eisr,
	.get_interrupt_status = vgic_v3_get_interrupt_status,
	.enable_underflow = vgic_v3_enable_underflow,
	.disable_underflow = vgic_v3_disable_underflow,
	.get_vmcr = vgic_v3_get_vmcr,
	.set_vmcr = vgic_v3_set_vmcr,
	.enable = vgic_v3_enable,
	};

	static struct vgic_params vgic_v3_params;

	static void vgic_cpu_init_lrs(void *params)
	{
	kvm_call_hyp(__vgic_v3_init_lrs);
	}

	/**
	* vgic_v3_probe - probe for a GICv3 compatible interrupt controller
	* @gic_kvm_info: pointer to the GIC description
	* @ops: address of a pointer to the GICv3 operations
	* @params: address of a pointer to HW-specific parameters
	*
	* Returns 0 if a GICv3 has been found, with the low level operations
	* in ops and the HW parameters in params. Returns an error code
	* otherwise.
	*/
	int vgic_v3_probe(const struct gic_kvm_info *gic_kvm_info,
	const struct vgic_ops **ops,
	const struct vgic_params **params)
	{
	int ret = 0;
	struct vgic_params *vgic = &vgic_v3_params;
	const struct resource *vcpu_res = &gic_kvm_info->vcpu;

	vgic->maint_irq = gic_kvm_info->maint_irq;

	ich_vtr_el2 = kvm_call_hyp(__vgic_v3_get_ich_vtr_el2);

	/*
	* The ListRegs field is 5 bits, but there is a architectural
	* maximum of 16 list registers. Just ignore bit 4...
	*/
	vgic->nr_lr = (ich_vtr_el2 & 0xf) + 1;
	vgic->can_emulate_gicv2 = false;

	if (!vcpu_res->start) {
	kvm_info("GICv3: no GICV resource entry\n");
	vgic->vcpu_base = 0;
	} else if (!PAGE_ALIGNED(vcpu_res->start)) {
	pr_warn("GICV physical address 0x%llx not page aligned\n",
	(unsigned long long)vcpu_res->start);
	vgic->vcpu_base = 0;
	} else if (!PAGE_ALIGNED(resource_size(vcpu_res))) {
	pr_warn("GICV size 0x%llx not a multiple of page size 0x%lx\n",
	(unsigned long long)resource_size(vcpu_res),
	PAGE_SIZE);
	} else {
	vgic->vcpu_base = vcpu_res->start;
	vgic->can_emulate_gicv2 = true;
	kvm_register_device_ops(&kvm_arm_vgic_v2_ops,
	KVM_DEV_TYPE_ARM_VGIC_V2);
	}
	if (vgic->vcpu_base == 0)
	kvm_info("disabling GICv2 emulation\n");
	kvm_register_device_ops(&kvm_arm_vgic_v3_ops, KVM_DEV_TYPE_ARM_VGIC_V3);

	vgic->vctrl_base = NULL;
	vgic->type = VGIC_V3;
	vgic->max_gic_vcpus = VGIC_V3_MAX_CPUS;

	kvm_info("GICV base=0x%llx, IRQ=%d\n",
	vgic->vcpu_base, vgic->maint_irq);

	on_each_cpu(vgic_cpu_init_lrs, vgic, 1);

	*ops = &vgic_v3_ops;
	*params = vgic;

	return ret;
	}