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KVM: arm64: Add capability to advertise ptrauth for guest

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This patch advertises the capability of two cpu feature called address
pointer authentication and generic pointer authentication. These
capabilities depend upon system support for pointer authentication and
VHE mode.

The current arm64 KVM partially implements pointer authentication and
support of address/generic authentication are tied together. However,
separate ABI requirements for both of them is added so that any future
isolated implementation will not require any ABI changes.

Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Christoffer Dall <christoffer.dall@arm.com>
Cc: kvmarm@lists.cs.columbia.edu
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Amit Daniel Kachhap
2019-04-23 10:12:37 +05:30
committed by Marc Zyngier
parent a22fa321d1
commit a243c16d18
3 changed files with 17 additions and 4 deletions
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5
arch/arm64/kvm/reset.c
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@@ -101,6 +101,11 @@ int kvm_arch_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_ARM_SVE:
r = system_supports_sve();
break;
case KVM_CAP_ARM_PTRAUTH_ADDRESS:
case KVM_CAP_ARM_PTRAUTH_GENERIC:
r = has_vhe() && system_supports_address_auth() &&
system_supports_generic_auth();
break;
default:
r = 0;
}