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KVM: arm64: Add userspace flag to enable pointer authentication

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Now that the building blocks of pointer authentication are present, lets
add userspace flags KVM_ARM_VCPU_PTRAUTH_ADDRESS and
KVM_ARM_VCPU_PTRAUTH_GENERIC. These flags will enable pointer
authentication for the KVM guest on a per-vcpu basis through the ioctl
KVM_ARM_VCPU_INIT.

This features will allow the KVM guest to allow the handling of
pointer authentication instructions or to treat them as undefined
if not set.

Necessary documentations are added to reflect the changes done.

Reviewed-by: Dave Martin <Dave.Martin@arm.com>
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 10:12:36 +05:30
committed by Marc Zyngier
parent 384b40caa8
commit a22fa321d1
5 changed files with 58 additions and 5 deletions
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10
Documentation/virtual/kvm/api.txt
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@@ -2761,6 +2761,16 @@ Possible features:
- KVM_ARM_VCPU_PMU_V3: Emulate PMUv3 for the CPU.
Depends on KVM_CAP_ARM_PMU_V3.
- 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.
- 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.
- KVM_ARM_VCPU_SVE: Enables SVE for the CPU (arm64 only).
Depends on KVM_CAP_ARM_SVE.
Requires KVM_ARM_VCPU_FINALIZE(KVM_ARM_VCPU_SVE):