[PATCH v4 09/10] KVM: arm64: Force guest's HCR_EL2.E2H RES1 when NV1 is not implemented
Marc Zyngier
maz at kernel.org
Mon Jan 22 10:13:43 PST 2024
If NV1 isn't supported on a system, make sure we always evaluate
the guest's HCR_EL2.E2H as RES1, irrespective of what the guest
may have written there.
Reviewed-by: Suzuki K Poulose <suzuki.poulose at arm.com>
Signed-off-by: Marc Zyngier <maz at kernel.org>
---
arch/arm64/include/asm/kvm_emulate.h | 3 ++-
arch/arm64/kvm/sys_regs.c | 12 +++++++++++-
2 files changed, 13 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index b804fe832184..debc3753d2ef 100644
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h
@@ -209,7 +209,8 @@ static inline bool vcpu_is_el2(const struct kvm_vcpu *vcpu)
static inline bool __vcpu_el2_e2h_is_set(const struct kvm_cpu_context *ctxt)
{
- return ctxt_sys_reg(ctxt, HCR_EL2) & HCR_E2H;
+ return (!cpus_have_final_cap(ARM64_HAS_HCR_NV1) ||
+ (ctxt_sys_reg(ctxt, HCR_EL2) & HCR_E2H));
}
static inline bool vcpu_el2_e2h_is_set(const struct kvm_vcpu *vcpu)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 08a9571fa809..041b11825578 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -2175,6 +2175,16 @@ static bool access_spsr(struct kvm_vcpu *vcpu,
return true;
}
+static u64 reset_hcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
+{
+ u64 val = r->val;
+
+ if (!cpus_have_final_cap(ARM64_HAS_HCR_NV1))
+ val |= HCR_E2H;
+
+ return __vcpu_sys_reg(vcpu, r->reg) = val;
+}
+
/*
* Architected system registers.
* Important: Must be sorted ascending by Op0, Op1, CRn, CRm, Op2
@@ -2666,7 +2676,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
EL2_REG_VNCR(VMPIDR_EL2, reset_unknown, 0),
EL2_REG(SCTLR_EL2, access_rw, reset_val, SCTLR_EL2_RES1),
EL2_REG(ACTLR_EL2, access_rw, reset_val, 0),
- EL2_REG_VNCR(HCR_EL2, reset_val, 0),
+ EL2_REG_VNCR(HCR_EL2, reset_hcr, 0),
EL2_REG(MDCR_EL2, access_rw, reset_val, 0),
EL2_REG(CPTR_EL2, access_rw, reset_val, CPTR_NVHE_EL2_RES1),
EL2_REG_VNCR(HSTR_EL2, reset_val, 0),
--
2.39.2
More information about the linux-arm-kernel
mailing list