[PATCH v3 15/17] KVM: arm64: Force HCR_E2H in guest context when ARM64_KVM_HVHE is set

Marc Zyngier
2023-06-09T16:47:05Z

Also make sure HCR_EL2.E2H is set when switching HCR_EL2 in guest
context.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
arch/arm64/include/asm/kvm_emulate.h | 2 +-
arch/arm64/kvm/hyp/nvhe/pkvm.c | 3 +++
2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index 4d82e622240d..cf40d19a72f8 100644
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h
@@ -74,7 +74,7 @@ static __always_inline bool vcpu_el1_is_32bit(struct kvm_vcpu *vcpu)
static inline void vcpu_reset_hcr(struct kvm_vcpu *vcpu)
{
vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS;
- if (is_kernel_in_hyp_mode())
+ if (has_vhe() || has_hvhe())
vcpu->arch.hcr_el2 |= HCR_E2H;
if (cpus_have_const_cap(ARM64_HAS_RAS_EXTN)) {
/* route synchronous external abort exceptions to EL2 */
diff --git a/arch/arm64/kvm/hyp/nvhe/pkvm.c b/arch/arm64/kvm/hyp/nvhe/pkvm.c
index 5d5ee735a7d9..8033ef353a5d 100644
--- a/arch/arm64/kvm/hyp/nvhe/pkvm.c
+++ b/arch/arm64/kvm/hyp/nvhe/pkvm.c
@@ -44,6 +44,9 @@ static void pvm_init_traps_aa64pfr0(struct kvm_vcpu *vcpu)
BUILD_BUG_ON(!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_AdvSIMD),
PVM_ID_AA64PFR0_ALLOW));

+ if (has_hvhe())
+ hcr_set |= HCR_E2H;
+
/* Trap RAS unless all current versions are supported */
if (FIELD_GET(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_RAS), feature_ids) <
ID_AA64PFR0_EL1_RAS_V1P1) {
--
2.34.1