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KVM: arm64: Expose KVM_ARM_CAP_MTE

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It's now safe for the VMM to enable MTE in a guest, so expose the
capability to user space.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210621111716.37157-5-steven.price@arm.com
This commit is contained in:
Steven Price 2021-06-21 12:17:14 +01:00 committed by Marc Zyngier
parent e1f358b504
commit 673638f434
3 changed files with 16 additions and 0 deletions
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9
arch/arm64/kvm/arm.c
View File

@ -93,6 +93,12 @@ int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
r = 0;
kvm->arch.return_nisv_io_abort_to_user = true;
break;
case KVM_CAP_ARM_MTE:
if (!system_supports_mte() || kvm->created_vcpus)
return -EINVAL;
r = 0;
kvm->arch.mte_enabled = true;
break;
default:
r = -EINVAL;
break;
@ -237,6 +243,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
*/
r = 1;
break;
case KVM_CAP_ARM_MTE:
r = system_supports_mte();
break;
case KVM_CAP_STEAL_TIME:
r = kvm_arm_pvtime_supported();
break;

4
arch/arm64/kvm/reset.c
View File

@ -176,6 +176,10 @@ static bool vcpu_allowed_register_width(struct kvm_vcpu *vcpu)
if (!cpus_have_const_cap(ARM64_HAS_32BIT_EL1) && is32bit)
return false;
/* MTE is incompatible with AArch32 */
if (kvm_has_mte(vcpu->kvm) && is32bit)
return false;
/* Check that the vcpus are either all 32bit or all 64bit */
kvm_for_each_vcpu(i, tmp, vcpu->kvm) {
if (vcpu_has_feature(tmp, KVM_ARM_VCPU_EL1_32BIT) != is32bit)

3
arch/arm64/kvm/sys_regs.c
View File

@ -1312,6 +1312,9 @@ static bool access_ccsidr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
static unsigned int mte_visibility(const struct kvm_vcpu *vcpu,
const struct sys_reg_desc *rd)
{
if (kvm_has_mte(vcpu->kvm))
return 0;
return REG_HIDDEN;
}