From: Marc Zyngier <maz@xxxxxxxxxx>
Prevent the host from issuing arbitrary PC adjustments for protected
vCPUs.
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
---
arch/arm64/kvm/hyp/nvhe/hyp-main.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/hyp-main.c
index 40cbf45800b7..86dff0dc05f3 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c
@@ -275,9 +275,22 @@ static void handle___pkvm_host_map_guest(struct kvm_cpu_context *host_ctxt)
static void handle___kvm_adjust_pc(struct kvm_cpu_context *host_ctxt)
{
- DECLARE_REG(struct kvm_vcpu *, vcpu, host_ctxt, 1);
+ struct kvm_shadow_vcpu_state *shadow_state;
+ struct kvm_vcpu *vcpu;
+
+ vcpu = get_current_vcpu(host_ctxt, 1, &shadow_state);
+ if (!vcpu)
+ return;
+
+ if (shadow_state) {
+ /* This only applies to non-protected VMs */
+ if (shadow_state_is_protected(shadow_state))
+ return;
+
+ vcpu = &shadow_state->shadow_vcpu;
+ }
- __kvm_adjust_pc(kern_hyp_va(vcpu));
+ __kvm_adjust_pc(vcpu);
}
static void handle___kvm_flush_vm_context(struct kvm_cpu_context *host_ctxt)
--
2.36.1.124.g0e6072fb45-goog
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