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[v3,06/11] KVM: arm64: Use vcpu_idx for invalidation tracking

Message ID 20230927090911.3355209-7-maz@kernel.org (mailing list archive)
State New, archived
Headers show
Series KVM: arm64: Accelerate lookup of vcpus by MPIDR values (and other fixes) | expand

Commit Message

Marc Zyngier Sept. 27, 2023, 9:09 a.m. UTC 
While vcpu_id isn't necessarily a bad choice as an identifier for
the currently running vcpu, it is provided by userspace, and there
is close to no guarantee that it would be unique.

Switch it to vcpu_idx instead, for which we have much stronger
guarantees.

Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/kvm/arm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index fa21fb15e927..9379a1227501 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -438,9 +438,9 @@  void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 	 * We might get preempted before the vCPU actually runs, but
 	 * over-invalidation doesn't affect correctness.
 	 */
-	if (*last_ran != vcpu->vcpu_id) {
+	if (*last_ran != vcpu->vcpu_idx) {
 		kvm_call_hyp(__kvm_flush_cpu_context, mmu);
-		*last_ran = vcpu->vcpu_id;
+		*last_ran = vcpu->vcpu_idx;
 	}
 
 	vcpu->cpu = cpu;