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authorAmit Daniel Kachhap <amit.kachhap@arm.com>2019-04-23 07:42:37 +0300
committerMarc Zyngier <marc.zyngier@arm.com>2019-04-24 17:30:40 +0300
commita243c16d18be130b17cf1064e9115de73bfdff5a (patch)
treef13a46c8673a636ccf77125112a47d0ccfef97c3 /Documentation/virtual
parenta22fa321d13b0264976cbbc1d22f4c27c41d3642 (diff)
downloadlinux-a243c16d18be130b17cf1064e9115de73bfdff5a.tar.xz
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 'Documentation/virtual')
-rw-r--r--Documentation/virtual/kvm/api.txt14
1 files changed, 10 insertions, 4 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index 32afe7f5c35a..fac1887f25b5 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -2763,13 +2763,19 @@ Possible features:
- KVM_ARM_VCPU_PTRAUTH_ADDRESS: Enables Address Pointer authentication
for arm64 only.
- Both KVM_ARM_VCPU_PTRAUTH_ADDRESS and KVM_ARM_VCPU_PTRAUTH_GENERIC
- must be requested or neither must be requested.
+ Depends on KVM_CAP_ARM_PTRAUTH_ADDRESS.
+ If KVM_CAP_ARM_PTRAUTH_ADDRESS and KVM_CAP_ARM_PTRAUTH_GENERIC are
+ both present, then both KVM_ARM_VCPU_PTRAUTH_ADDRESS and
+ KVM_ARM_VCPU_PTRAUTH_GENERIC must be requested or neither must be
+ requested.
- KVM_ARM_VCPU_PTRAUTH_GENERIC: Enables Generic Pointer authentication
for arm64 only.
- Both KVM_ARM_VCPU_PTRAUTH_ADDRESS and KVM_ARM_VCPU_PTRAUTH_GENERIC
- must be requested or neither must be requested.
+ Depends on KVM_CAP_ARM_PTRAUTH_GENERIC.
+ If KVM_CAP_ARM_PTRAUTH_ADDRESS and KVM_CAP_ARM_PTRAUTH_GENERIC are
+ both present, then both KVM_ARM_VCPU_PTRAUTH_ADDRESS and
+ KVM_ARM_VCPU_PTRAUTH_GENERIC must be requested or neither must be
+ requested.
- KVM_ARM_VCPU_SVE: Enables SVE for the CPU (arm64 only).
Depends on KVM_CAP_ARM_SVE.