[PATCH v5 26/43] arm64: Don't expose stolen time for realm guests

From: Steven Price
Date: Fri Oct 04 2024 - 11:37:16 EST


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.

Signed-off-by: Steven Price <steven.price@xxxxxxx>
---
arch/arm64/kvm/arm.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 075c1b7306ff..bde1e0f23258 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -433,7 +433,10 @@ 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);
--
2.34.1