| Message ID | 20250213161426.102987-27-steven.price@arm.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | arm64: Support for Arm CCA in KVM | expand |
On 2/14/25 2:14 AM, Steven Price wrote: > It doesn't make much sense as a realm guest wouldn't want to trust the > host. It will also need some extra work to ensure that KVM will only > attempt to write into a shared memory region. So for now just disable > it. > > Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> > Signed-off-by: Steven Price <steven.price@arm.com> > --- > arch/arm64/kvm/arm.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > With Documentation/virt/kvm/api.rst updated: Reviewed-by: Gavin Shan <gshan@redhat.com> > diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c > index a6718dec00c9..79d541c95bfb 100644 > --- a/arch/arm64/kvm/arm.c > +++ b/arch/arm64/kvm/arm.c > @@ -403,7 +403,10 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) > r = system_supports_mte(); > break; > case KVM_CAP_STEAL_TIME: > - r = kvm_arm_pvtime_supported(); > + if (kvm_is_realm(kvm)) > + r = 0; > + else > + r = kvm_arm_pvtime_supported(); > break; > case KVM_CAP_ARM_EL1_32BIT: > r = cpus_have_final_cap(ARM64_HAS_32BIT_EL1);
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index a6718dec00c9..79d541c95bfb 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -403,7 +403,10 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) r = system_supports_mte(); break; case KVM_CAP_STEAL_TIME: - r = kvm_arm_pvtime_supported(); + if (kvm_is_realm(kvm)) + r = 0; + else + r = kvm_arm_pvtime_supported(); break; case KVM_CAP_ARM_EL1_32BIT: r = cpus_have_final_cap(ARM64_HAS_32BIT_EL1);