[PATCH v8 6/7] arm/arm64: vgic: Implement VGICv3 CPU interface access

[vijay.kilari@gmail.com]

From: Vijaya Kumar K <Vijaya.Kumar@cavium.com>

VGICv3 CPU interface registers are accessed using
KVM_DEV_ARM_VGIC_CPU_SYSREGS ioctl. These registers are accessed
as 64-bit. The cpu MPIDR value is passed along with register id.
is used to identify the cpu for registers access.

The version of VGIC v3 specification is define here
http://lists.infradead.org/pipermail/linux-arm-kernel/2016-July/445611.html

Signed-off-by: Pavel Fedin <p.fedin@samsung.com>
Signed-off-by: Vijaya Kumar K <Vijaya.Kumar@cavium.com>
---
 arch/arm64/include/uapi/asm/kvm.h   |   3 +
 arch/arm64/kvm/Makefile             |   1 +
 include/kvm/arm_vgic.h              |   9 +
 virt/kvm/arm/vgic/vgic-kvm-device.c |  27 +++
 virt/kvm/arm/vgic/vgic-mmio-v3.c    |  19 +++
 virt/kvm/arm/vgic/vgic-sys-reg-v3.c | 324 ++++++++++++++++++++++++++++++++++++
 virt/kvm/arm/vgic/vgic-v3.c         |   8 +
 virt/kvm/arm/vgic/vgic.h            |   4 +
 8 files changed, 395 insertions(+)

diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h
index 56dc08d..91c7137 100644
--- a/arch/arm64/include/uapi/asm/kvm.h
+++ b/arch/arm64/include/uapi/asm/kvm.h
@@ -206,9 +206,12 @@ struct kvm_arch_memory_slot {
 			(0xffffffffULL << KVM_DEV_ARM_VGIC_V3_MPIDR_SHIFT)
 #define   KVM_DEV_ARM_VGIC_OFFSET_SHIFT	0
 #define   KVM_DEV_ARM_VGIC_OFFSET_MASK	(0xffffffffULL << KVM_DEV_ARM_VGIC_OFFSET_SHIFT)
+#define   KVM_DEV_ARM_VGIC_SYSREG_INSTR_MASK (0xffff)
 #define KVM_DEV_ARM_VGIC_GRP_NR_IRQS	3
 #define KVM_DEV_ARM_VGIC_GRP_CTRL	4
 #define KVM_DEV_ARM_VGIC_GRP_REDIST_REGS 5
+#define KVM_DEV_ARM_VGIC_CPU_SYSREGS    6
+
 #define   KVM_DEV_ARM_VGIC_CTRL_INIT	0
 
 /* Device Control API on vcpu fd */
diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile
index d50a82a..1a14e29 100644
--- a/arch/arm64/kvm/Makefile
+++ b/arch/arm64/kvm/Makefile
@@ -32,5 +32,6 @@ kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-mmio-v3.o
 kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-kvm-device.o
 kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-its.o
 kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/irqchip.o
+kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/vgic/vgic-sys-reg-v3.o
 kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/arch_timer.o
 kvm-$(CONFIG_KVM_ARM_PMU) += $(KVM)/arm/pmu.o
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index 002f092..730a18a 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -71,6 +71,9 @@ struct vgic_global {
 
 	/* GIC system register CPU interface */
 	struct static_key_false gicv3_cpuif;
+
+	/* Cache ICH_VTR_EL2 reg value */
+	u32			ich_vtr_el2;
 };
 
 extern struct vgic_global kvm_vgic_global_state;
@@ -269,6 +272,12 @@ struct vgic_cpu {
 	u64 pendbaser;
 
 	bool lpis_enabled;
+
+	/* Cache guest priority bits */
+	u32 num_pri_bits;
+
+	/* Cache guest interrupt ID bits */
+	u32 num_id_bits;
 };
 
 extern struct static_key_false vgic_v2_cpuif_trap;
diff --git a/virt/kvm/arm/vgic/vgic-kvm-device.c b/virt/kvm/arm/vgic/vgic-kvm-device.c
index 6c7d30c..da532d1 100644
--- a/virt/kvm/arm/vgic/vgic-kvm-device.c
+++ b/virt/kvm/arm/vgic/vgic-kvm-device.c
@@ -504,6 +504,14 @@ static int vgic_v3_attr_regs_access(struct kvm_device *dev,
 		if (!is_write)
 			*reg = tmp32;
 		break;
+	case KVM_DEV_ARM_VGIC_CPU_SYSREGS: {
+		u64 regid;
+
+		regid = (attr->attr & KVM_DEV_ARM_VGIC_SYSREG_INSTR_MASK);
+		ret = vgic_v3_cpu_sysregs_uaccess(vcpu, is_write,
+						  regid, reg);
+		break;
+	}
 	default:
 		ret = -EINVAL;
 		break;
@@ -537,6 +545,15 @@ static int vgic_v3_set_attr(struct kvm_device *dev,
 		reg = tmp32;
 		return vgic_v3_attr_regs_access(dev, attr, &reg, true);
 	}
+	case KVM_DEV_ARM_VGIC_CPU_SYSREGS: {
+		u64 __user *uaddr = (u64 __user *)(long)attr->addr;
+		u64 reg;
+
+		if (get_user(reg, uaddr))
+			return -EFAULT;
+
+		return vgic_v3_attr_regs_access(dev, attr, &reg, true);
+	}
 	}
 	return -ENXIO;
 }
@@ -563,6 +580,15 @@ static int vgic_v3_get_attr(struct kvm_device *dev,
 		tmp32 = reg;
 		return put_user(tmp32, uaddr);
 	}
+	case KVM_DEV_ARM_VGIC_CPU_SYSREGS: {
+		u64 __user *uaddr = (u64 __user *)(long)attr->addr;
+		u64 reg;
+
+		ret = vgic_v3_attr_regs_access(dev, attr, &reg, false);
+		if (ret)
+			return ret;
+		return put_user(reg, uaddr);
+	}
 	}
 
 	return -ENXIO;
@@ -581,6 +607,7 @@ static int vgic_v3_has_attr(struct kvm_device *dev,
 		break;
 	case KVM_DEV_ARM_VGIC_GRP_DIST_REGS:
 	case KVM_DEV_ARM_VGIC_GRP_REDIST_REGS:
+	case KVM_DEV_ARM_VGIC_CPU_SYSREGS:
 		return vgic_v3_has_attr_regs(dev, attr);
 	case KVM_DEV_ARM_VGIC_GRP_NR_IRQS:
 		return 0;
diff --git a/virt/kvm/arm/vgic/vgic-mmio-v3.c b/virt/kvm/arm/vgic/vgic-mmio-v3.c
index b35fb83..519b919 100644
--- a/virt/kvm/arm/vgic/vgic-mmio-v3.c
+++ b/virt/kvm/arm/vgic/vgic-mmio-v3.c
@@ -23,6 +23,7 @@
 
 #include "vgic.h"
 #include "vgic-mmio.h"
+#include "sys_regs.h"
 
 /* extract @num bytes at @offset bytes offset in data */
 unsigned long extract_bytes(u64 data, unsigned int offset,
@@ -639,6 +640,24 @@ int vgic_v3_has_attr_regs(struct kvm_device *dev, struct kvm_device_attr *attr)
 		nr_regions = ARRAY_SIZE(vgic_v3_rdbase_registers);
 		break;
 	}
+	case KVM_DEV_ARM_VGIC_CPU_SYSREGS: {
+		u64 reg, id;
+		unsigned long vgic_mpidr, mpidr_reg;
+		struct kvm_vcpu *vcpu;
+
+		vgic_mpidr = (attr->attr & KVM_DEV_ARM_VGIC_V3_MPIDR_MASK) >>
+			      KVM_DEV_ARM_VGIC_V3_MPIDR_SHIFT;
+
+		/* Convert plain mpidr value to MPIDR reg format */
+		mpidr_reg = VGIC_TO_MPIDR(vgic_mpidr);
+
+		vcpu = kvm_mpidr_to_vcpu(dev->kvm, mpidr_reg);
+		if (!vcpu)
+			return -EINVAL;
+
+		id = (attr->attr & KVM_DEV_ARM_VGIC_SYSREG_INSTR_MASK);
+		return vgic_v3_has_cpu_sysregs_attr(vcpu, 0, id, &reg);
+	}
 	default:
 		return -ENXIO;
 	}
diff --git a/virt/kvm/arm/vgic/vgic-sys-reg-v3.c b/virt/kvm/arm/vgic/vgic-sys-reg-v3.c
new file mode 100644
index 0000000..69d8597
--- /dev/null
+++ b/virt/kvm/arm/vgic/vgic-sys-reg-v3.c
@@ -0,0 +1,324 @@
+#include <linux/irqchip/arm-gic-v3.h>
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <kvm/iodev.h>
+#include <kvm/arm_vgic.h>
+#include <asm/kvm_emulate.h>
+#include <asm/kvm_arm.h>
+#include <asm/kvm_mmu.h>
+
+#include "vgic.h"
+#include "vgic-mmio.h"
+#include "sys_regs.h"
+
+static bool access_gic_ctlr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			    const struct sys_reg_desc *r)
+{
+	struct vgic_cpu *vgic_v3_cpu = &vcpu->arch.vgic_cpu;
+	struct vgic_vmcr vmcr;
+	u64 val;
+	u32 num_pri_bits, num_id_bits;
+
+	vgic_get_vmcr(vcpu, &vmcr);
+	if (p->is_write) {
+		val = p->regval;
+
+		/*
+		 * Does not allow update of ICC_CTLR_EL1 if HW does not support
+		 * guest programmed ID and PRI bits
+		 */
+		num_pri_bits = ((val & ICC_CTLR_EL1_PRI_BITS_MASK) >>
+				ICC_CTLR_EL1_PRI_BITS_SHIFT) + 1;
+		if (num_pri_bits > vgic_v3_cpu->num_pri_bits)
+			return false;
+
+		vgic_v3_cpu->num_pri_bits = num_pri_bits;
+
+		num_id_bits = (val & ICC_CTLR_EL1_ID_BITS_MASK) >>
+			       ICC_CTLR_EL1_ID_BITS_SHIFT;
+		if (num_id_bits > vgic_v3_cpu->num_id_bits)
+			return false;
+
+		vgic_v3_cpu->num_id_bits = num_id_bits;
+
+		vmcr.ctlr &= ~(ICH_VMCR_CBPR_MASK | ICH_VMCR_EOIM_MASK);
+		vmcr.ctlr |= ((val & ICC_CTLR_EL1_CBPR_MASK) >>
+			      ICC_CTLR_EL1_CBPR_SHIFT) << ICH_VMCR_CBPR_SHIFT;
+		vmcr.ctlr |= ((val & ICC_CTLR_EL1_EOImode_MASK) >>
+			      ICC_CTLR_EL1_EOImode_SHIFT) <<
+			      ICH_VMCR_EOIM_SHIFT;
+		vgic_set_vmcr(vcpu, &vmcr);
+	} else {
+		val = 0;
+		val |= (vgic_v3_cpu->num_pri_bits - 1) <<
+			ICC_CTLR_EL1_PRI_BITS_SHIFT;
+		val |= vgic_v3_cpu->num_id_bits <<
+			ICC_CTLR_EL1_ID_BITS_SHIFT;
+		val |= ((kvm_vgic_global_state.ich_vtr_el2 &
+			ICH_VTR_SEIS_MASK) >> ICH_VTR_SEIS_SHIFT) <<
+			ICC_CTLR_EL1_SEIS_SHIFT;
+		val |= ((kvm_vgic_global_state.ich_vtr_el2 &
+			ICH_VTR_A3V_MASK) >> ICH_VTR_A3V_SHIFT) <<
+			ICC_CTLR_EL1_A3V_SHIFT;
+		val |= ((vmcr.ctlr & ICH_VMCR_CBPR_MASK) >>
+			ICH_VMCR_CBPR_SHIFT) << ICC_CTLR_EL1_CBPR_SHIFT;
+		val |= ((vmcr.ctlr & ICH_VMCR_EOIM_MASK) >>
+			ICH_VMCR_EOIM_SHIFT) << ICC_CTLR_EL1_EOImode_SHIFT;
+
+		p->regval = val;
+	}
+
+	return true;
+}
+
+static bool access_gic_pmr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			   const struct sys_reg_desc *r)
+{
+	struct vgic_vmcr vmcr;
+
+	vgic_get_vmcr(vcpu, &vmcr);
+	if (p->is_write) {
+		vmcr.pmr = (p->regval & ICC_PMR_EL1_MASK) >> ICC_PMR_EL1_SHIFT;
+		vgic_set_vmcr(vcpu, &vmcr);
+	} else {
+		p->regval = (vmcr.pmr << ICC_PMR_EL1_SHIFT) & ICC_PMR_EL1_MASK;
+	}
+
+	return true;
+}
+
+static bool access_gic_bpr0(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			    const struct sys_reg_desc *r)
+{
+	struct vgic_vmcr vmcr;
+
+	vgic_get_vmcr(vcpu, &vmcr);
+	if (p->is_write) {
+		vmcr.bpr = (p->regval & ICC_BPR0_EL1_MASK) >>
+			    ICC_BPR0_EL1_SHIFT;
+		vgic_set_vmcr(vcpu, &vmcr);
+	} else {
+		p->regval = (vmcr.bpr << ICC_BPR0_EL1_SHIFT) &
+			     ICC_BPR0_EL1_MASK;
+	}
+
+	return true;
+}
+
+static bool access_gic_bpr1(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			    const struct sys_reg_desc *r)
+{
+	struct vgic_vmcr vmcr;
+
+	if (!p->is_write)
+		p->regval = 0;
+
+	vgic_get_vmcr(vcpu, &vmcr);
+	if (!((vmcr.ctlr & ICH_VMCR_CBPR_MASK) >> ICH_VMCR_CBPR_SHIFT)) {
+		if (p->is_write) {
+			vmcr.abpr = (p->regval & ICC_BPR1_EL1_MASK) >>
+				     ICC_BPR1_EL1_SHIFT;
+			vgic_set_vmcr(vcpu, &vmcr);
+		} else {
+			p->regval = (vmcr.abpr << ICC_BPR1_EL1_SHIFT) &
+				     ICC_BPR1_EL1_MASK;
+		}
+	} else {
+		if (!p->is_write)
+			p->regval = min((vmcr.bpr + 1), 7U);
+	}
+
+	return true;
+}
+
+static bool access_gic_grpen0(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			      const struct sys_reg_desc *r)
+{
+	struct vgic_vmcr vmcr;
+
+	vgic_get_vmcr(vcpu, &vmcr);
+	if (p->is_write) {
+		vmcr.grpen0 = (p->regval & ICC_IGRPEN0_EL1_MASK) >>
+				      ICC_IGRPEN0_EL1_SHIFT;
+		vgic_set_vmcr(vcpu, &vmcr);
+	} else {
+		p->regval = (vmcr.grpen0 << ICC_IGRPEN0_EL1_SHIFT) &
+			     ICC_IGRPEN0_EL1_MASK;
+	}
+
+	return true;
+}
+
+static bool access_gic_grpen1(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			      const struct sys_reg_desc *r)
+{
+	struct vgic_vmcr vmcr;
+
+	vgic_get_vmcr(vcpu, &vmcr);
+	if (p->is_write) {
+		vmcr.grpen1 = (p->regval & ICC_IGRPEN1_EL1_MASK) >>
+				      ICC_IGRPEN1_EL1_SHIFT;
+		vgic_set_vmcr(vcpu, &vmcr);
+	} else {
+		p->regval = (vmcr.grpen1 << ICC_IGRPEN1_EL1_SHIFT) &
+			     ICC_IGRPEN1_EL1_MASK;
+	}
+
+	return true;
+}
+
+static void vgic_v3_access_apr_reg(struct kvm_vcpu *vcpu,
+				   struct sys_reg_params *p, u8 apr, u8 idx)
+{
+	struct vgic_v3_cpu_if *vgicv3 = &vcpu->arch.vgic_cpu.vgic_v3;
+	uint32_t *ap_reg;
+
+	if (apr)
+		ap_reg = &vgicv3->vgic_ap1r[idx];
+	else
+		ap_reg = &vgicv3->vgic_ap0r[idx];
+
+	if (p->is_write)
+		*ap_reg = p->regval;
+	else
+		p->regval = *ap_reg;
+}
+
+static void access_gic_aprn(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			    const struct sys_reg_desc *r, u8 apr)
+{
+	struct vgic_cpu *vgic_v3_cpu = &vcpu->arch.vgic_cpu;
+	u8 idx = r->Op2 & 3;
+
+	switch (vgic_v3_cpu->num_pri_bits) {
+	case 7:
+		if (idx > 3)
+			goto err;
+		vgic_v3_access_apr_reg(vcpu, p, apr, idx);
+		break;
+	case 6:
+		if (idx > 1)
+			goto err;
+		vgic_v3_access_apr_reg(vcpu, p, apr, idx);
+		break;
+	default:
+		if (idx > 0)
+			goto err;
+		vgic_v3_access_apr_reg(vcpu, p, apr, idx);
+	}
+
+	return;
+err:
+	if (!p->is_write)
+		p->regval = 0;
+}
+
+static bool access_gic_ap0r(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			    const struct sys_reg_desc *r)
+{
+	access_gic_aprn(vcpu, p, r, 0);
+
+	return true;
+}
+
+static bool access_gic_ap1r(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			    const struct sys_reg_desc *r)
+{
+	access_gic_aprn(vcpu, p, r, 1);
+
+	return true;
+}
+
+static bool access_gic_sre(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			   const struct sys_reg_desc *r)
+{
+	struct vgic_v3_cpu_if *vgicv3 = &vcpu->arch.vgic_cpu.vgic_v3;
+
+	/* Validate SRE bit */
+	if (p->is_write) {
+		if (!(p->regval & ICC_SRE_EL1_SRE))
+			return false;
+	} else {
+		p->regval = vgicv3->vgic_sre;
+	}
+
+	return true;
+}
+
+static const struct sys_reg_desc gic_v3_icc_reg_descs[] = {
+	/* ICC_PMR_EL1 */
+	{ Op0(3), Op1(0), CRn(4), CRm(6), Op2(0), access_gic_pmr },
+	/* ICC_BPR0_EL1 */
+	{ Op0(3), Op1(0), CRn(12), CRm(8), Op2(3), access_gic_bpr0 },
+	/* ICC_AP0R0_EL1 */
+	{ Op0(3), Op1(0), CRn(12), CRm(8), Op2(4), access_gic_ap0r },
+	/* ICC_AP0R1_EL1 */
+	{ Op0(3), Op1(0), CRn(12), CRm(8), Op2(5), access_gic_ap0r },
+	/* ICC_AP0R2_EL1 */
+	{ Op0(3), Op1(0), CRn(12), CRm(8), Op2(6), access_gic_ap0r },
+	/* ICC_AP0R3_EL1 */
+	{ Op0(3), Op1(0), CRn(12), CRm(8), Op2(7), access_gic_ap0r },
+	/* ICC_AP1R0_EL1 */
+	{ Op0(3), Op1(0), CRn(12), CRm(9), Op2(0), access_gic_ap1r },
+	/* ICC_AP1R1_EL1 */
+	{ Op0(3), Op1(0), CRn(12), CRm(9), Op2(1), access_gic_ap1r },
+	/* ICC_AP1R2_EL1 */
+	{ Op0(3), Op1(0), CRn(12), CRm(9), Op2(2), access_gic_ap1r },
+	/* ICC_AP1R3_EL1 */
+	{ Op0(3), Op1(0), CRn(12), CRm(9), Op2(3), access_gic_ap1r },
+	/* ICC_BPR1_EL1 */
+	{ Op0(3), Op1(0), CRn(12), CRm(12), Op2(3), access_gic_bpr1 },
+	/* ICC_CTLR_EL1 */
+	{ Op0(3), Op1(0), CRn(12), CRm(12), Op2(4), access_gic_ctlr },
+	/* ICC_SRE_EL1 */
+	{ Op0(3), Op1(0), CRn(12), CRm(12), Op2(5), access_gic_sre },
+	/* ICC_IGRPEN0_EL1 */
+	{ Op0(3), Op1(0), CRn(12), CRm(12), Op2(6), access_gic_grpen0 },
+	/* ICC_GRPEN1_EL1 */
+	{ Op0(3), Op1(0), CRn(12), CRm(12), Op2(7), access_gic_grpen1 },
+};
+
+int vgic_v3_has_cpu_sysregs_attr(struct kvm_vcpu *vcpu, bool is_write, u64 id,
+				u64 *reg)
+{
+	struct sys_reg_params params;
+	u64 sysreg = (id & KVM_DEV_ARM_VGIC_SYSREG_MASK) | KVM_REG_SIZE_U64;
+
+	params.regval = *reg;
+	params.is_write = is_write;
+	params.is_aarch32 = false;
+	params.is_32bit = false;
+
+	if (find_reg_by_id(sysreg, &params, gic_v3_icc_reg_descs,
+			      ARRAY_SIZE(gic_v3_icc_reg_descs)))
+		return 0;
+
+	return -ENXIO;
+}
+
+int vgic_v3_cpu_sysregs_uaccess(struct kvm_vcpu *vcpu, bool is_write, u64 id,
+				u64 *reg)
+{
+	struct sys_reg_params params;
+	const struct sys_reg_desc *r;
+	u64 sysreg = (id & KVM_DEV_ARM_VGIC_SYSREG_MASK) | KVM_REG_SIZE_U64;
+
+	if (is_write)
+		params.regval = *reg;
+	params.is_write = is_write;
+	params.is_aarch32 = false;
+	params.is_32bit = false;
+
+	r = find_reg_by_id(sysreg, &params, gic_v3_icc_reg_descs,
+			   ARRAY_SIZE(gic_v3_icc_reg_descs));
+	if (!r)
+		return -ENXIO;
+
+	if (!r->access(vcpu, &params, r))
+		return -EINVAL;
+
+	if (!is_write)
+		*reg = params.regval;
+
+	return 0;
+}
diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c
index 967c295..1139971 100644
--- a/virt/kvm/arm/vgic/vgic-v3.c
+++ b/virt/kvm/arm/vgic/vgic-v3.c
@@ -228,6 +228,13 @@ void vgic_v3_enable(struct kvm_vcpu *vcpu)
 		vgic_v3->vgic_sre = 0;
 	}
 
+	vcpu->arch.vgic_cpu.num_id_bits = (kvm_vgic_global_state.ich_vtr_el2 &
+					   ICH_VTR_ID_BITS_MASK) >>
+					   ICH_VTR_ID_BITS_SHIFT;
+	vcpu->arch.vgic_cpu.num_pri_bits = ((kvm_vgic_global_state.ich_vtr_el2 &
+					    ICH_VTR_PRI_BITS_MASK) >>
+					    ICH_VTR_PRI_BITS_SHIFT) + 1;
+
 	/* Get the show on the road... */
 	vgic_v3->vgic_hcr = ICH_HCR_EN;
 }
@@ -328,6 +335,7 @@ int vgic_v3_probe(const struct gic_kvm_info *info)
 	 */
 	kvm_vgic_global_state.nr_lr = (ich_vtr_el2 & 0xf) + 1;
 	kvm_vgic_global_state.can_emulate_gicv2 = false;
+	kvm_vgic_global_state.ich_vtr_el2 = ich_vtr_el2;
 
 	if (!info->vcpu.start) {
 		kvm_info("GICv3: no GICV resource entry\n");
diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h
index c461f6b..0e632d0 100644
--- a/virt/kvm/arm/vgic/vgic.h
+++ b/virt/kvm/arm/vgic/vgic.h
@@ -126,6 +126,10 @@ int vgic_v3_dist_uaccess(struct kvm_vcpu *vcpu, bool is_write,
 			 int offset, u32 *val);
 int vgic_v3_redist_uaccess(struct kvm_vcpu *vcpu, bool is_write,
 			 int offset, u32 *val);
+int vgic_v3_cpu_sysregs_uaccess(struct kvm_vcpu *vcpu, bool is_write,
+			 u64 id, u64 *val);
+int vgic_v3_has_cpu_sysregs_attr(struct kvm_vcpu *vcpu, bool is_write, u64 id,
+				u64 *reg);
 #else
 static inline int vgic_register_its_iodevs(struct kvm *kvm)
 {
-- 
1.9.1