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| author | Amit Daniel Kachhap <amit.kachhap@arm.com> | 2019-04-23 10:12:37 +0530 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2019-04-24 15:30:40 +0100 |
| commit | a243c16d18be130b17cf1064e9115de73bfdff5a (patch) | |
| tree | f13a46c8673a636ccf77125112a47d0ccfef97c3 /Documentation/virtual | |
| parent | a22fa321d13b0264976cbbc1d22f4c27c41d3642 (diff) | |
| download | lwn-a243c16d18be130b17cf1064e9115de73bfdff5a.tar.gz lwn-a243c16d18be130b17cf1064e9115de73bfdff5a.zip | |
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.txt | 14 |
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. |