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authorAmit Daniel Kachhap <amit.kachhap@arm.com>2019-04-23 10:12:37 +0530
committerMarc Zyngier <marc.zyngier@arm.com>2019-04-24 15:30:40 +0100
commita243c16d18be130b17cf1064e9115de73bfdff5a (patch)
treef13a46c8673a636ccf77125112a47d0ccfef97c3 /arch/arm64/kvm
parenta22fa321d13b0264976cbbc1d22f4c27c41d3642 (diff)
KVM: arm64: Add capability to advertise ptrauth for guest
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>
Diffstat (limited to 'arch/arm64/kvm')
-rw-r--r--arch/arm64/kvm/reset.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
index 028d0c604652..f0faf54f5857 100644
--- a/arch/arm64/kvm/reset.c
+++ b/arch/arm64/kvm/reset.c
@@ -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;
}