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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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14
Documentation/virtual/kvm/api.txt
View File

@ -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.

5
arch/arm64/kvm/reset.c
View File

@ -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;
}

2
include/uapi/linux/kvm.h
View File

@ -989,6 +989,8 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_MANUAL_DIRTY_LOG_PROTECT 166
#define KVM_CAP_HYPERV_CPUID 167
#define KVM_CAP_ARM_SVE 168
#define KVM_CAP_ARM_PTRAUTH_ADDRESS 169
#define KVM_CAP_ARM_PTRAUTH_GENERIC 170
#ifdef KVM_CAP_IRQ_ROUTING