Subject: [PATCH v2 83/94] KVM: arm64: VNCR-ize ELR_EL1

From: Marc Zyngier <[email-masked]>
Date: Tue, 11 Feb 2020 17:49:27 +0000

ELR_EL1 being a VNCR-capable register, let's flag it as such, and
repaint all the accesses

Signed-off-by: Marc Zyngier <[email-masked]>
---
 arch/arm64/include/asm/kvm_emulate.h | 2 +-
 arch/arm64/include/asm/kvm_host.h    | 2 +-
 arch/arm64/kvm/guest.c               | 2 +-
 arch/arm64/kvm/hyp/sysreg-sr.c       | 4 ++--
 arch/arm64/kvm/sys_regs.c            | 4 ++--
 5 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index 16cd99ab7170..5718fbc56ba5 100644
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h
@@ -164,7 +164,7 @@ static inline unsigned long *vcpu_pc(const struct kvm_vcpu *vcpu)
 
 static inline unsigned long *__vcpu_elr_el1(const struct kvm_vcpu *vcpu)
 {
-	return (unsigned long *)&vcpu->arch.ctxt.elr_el1;
+	return (unsigned long *)__ctxt_sys_reg(&vcpu->arch.ctxt, ELR_EL1);
 }
 
 static inline unsigned long vcpu_read_elr_el1(const struct kvm_vcpu *vcpu)
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 29ecd13ab4e2..a497e7970418 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -264,6 +264,7 @@ enum vcpu_sysreg {
 	VNCR(CONTEXTIDR_EL1),	/* Context ID Register */
 	VNCR(AMAIR_EL1),/* Aux Memory Attribute Indirection Register */
 	VNCR(MDSCR_EL1),/* Monitor Debug System Control Register */
+	VNCR(ELR_EL1),
 	VNCR(VPIDR_EL2),/* Virtualization Processor ID Register */
 	VNCR(VMPIDR_EL2),/* Virtualization Multiprocessor ID Register */
 	VNCR(HCR_EL2),	/* Hypervisor Configuration Register */
@@ -335,7 +336,6 @@ struct kvm_cpu_context {
 	struct user_pt_regs regs;	/* sp = sp_el0 */
 
 	u64	sp_el1;
-	u64	elr_el1;
 
 	u64	spsr[KVM_NR_SPSR];
 
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index fb416f624920..40ef6758266d 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -128,7 +128,7 @@ static void *core_reg_addr(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 		return &vcpu->arch.ctxt.sp_el1;
 
 	case KVM_REG_ARM_CORE_REG(elr_el1):
-		return &vcpu->arch.ctxt.elr_el1;
+		return __vcpu_elr_el1(vcpu);
 
 	case KVM_REG_ARM_CORE_REG(spsr[0]) ...
 	     KVM_REG_ARM_CORE_REG(spsr[KVM_NR_SPSR - 1]):
diff --git a/arch/arm64/kvm/hyp/sysreg-sr.c b/arch/arm64/kvm/hyp/sysreg-sr.c
index 8b07be72f2e7..10ce7a6a0c6c 100644
--- a/arch/arm64/kvm/hyp/sysreg-sr.c
+++ b/arch/arm64/kvm/hyp/sysreg-sr.c
@@ -59,7 +59,7 @@ static void __hyp_text __sysreg_save_vel1_state(struct kvm_cpu_context *ctxt)
 	ctxt_sys_reg(ctxt, CNTKCTL_EL1)	= read_sysreg_el1(SYS_CNTKCTL);
 
 	ctxt->sp_el1			= read_sysreg(sp_el1);
-	ctxt->elr_el1			= read_sysreg_el1(SYS_ELR);
+	ctxt_sys_reg(ctxt, ELR_EL1)	= read_sysreg_el1(SYS_ELR);
 	ctxt->spsr[KVM_SPSR_EL1]	= read_sysreg_el1(SYS_SPSR);
 }
 
@@ -324,7 +324,7 @@ static void __hyp_text __sysreg_restore_vel1_state(struct kvm_cpu_context *ctxt)
 	}
 
 	write_sysreg(ctxt->sp_el1,			sp_el1);
-	write_sysreg_el1(ctxt->elr_el1,			SYS_ELR);
+	write_sysreg_el1(ctxt_sys_reg(ctxt, ELR_EL1),	SYS_ELR);
 	write_sysreg_el1(ctxt->spsr[KVM_SPSR_EL1],	SYS_SPSR);
 }
 
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index d59fc246aee3..dc1b75a37f00 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1833,9 +1833,9 @@ static bool access_elr(struct kvm_vcpu *vcpu,
 		return false;
 
 	if (p->is_write)
-		vcpu->arch.ctxt.elr_el1 = p->regval;
+		*__vcpu_elr_el1(vcpu) = p->regval;
 	else
-		p->regval = vcpu->arch.ctxt.elr_el1;
+		p->regval = *__vcpu_elr_el1(vcpu);
 
 	return true;
 }
-- 
2.20.1

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