Commit be3473c3 authored by Will Deacon's avatar Will Deacon Committed by Marc Zyngier
Browse files

KVM: arm64: Don't advertise unsupported features for protected guests 



Both SVE and PMUv3 are treated as "restricted" features for protected
guests and attempts to access their corresponding architectural state
from a protected guest result in an undefined exception being injected
by the hypervisor.

Since these exceptions are unexpected and typically fatal for the guest,
don't advertise these features for protected guests.

Reviewed-by: default avatarFuad Tabba <tabba@google.com>
Tested-by: default avatarFuad Tabba <tabba@google.com>
Tested-by: default avatarMostafa Saleh <smostafa@google.com>
Signed-off-by: default avatarWill Deacon <will@kernel.org>
Link: https://patch.msgid.link/20260330144841.26181-6-will@kernel.org


Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
parent ff1e7f98

arch/arm64/include/asm/kvm_pkvm.h

+0 −2
Original line number Diff line number Diff line
@@ -40,8 +40,6 @@ static inline bool kvm_pkvm_ext_allowed(struct kvm *kvm, long ext) 
	case KVM_CAP_MAX_VCPU_ID:

	case KVM_CAP_MSI_DEVID:

	case KVM_CAP_ARM_VM_IPA_SIZE:

	case KVM_CAP_ARM_PMU_V3:

	case KVM_CAP_ARM_SVE:

	case KVM_CAP_ARM_PTRAUTH_ADDRESS:

	case KVM_CAP_ARM_PTRAUTH_GENERIC:

		return true;