Commit 5f4bd815 authored by Marc Zyngier's avatar Marc Zyngier Committed by Oliver Upton
Browse files

KVM: arm64: Use vcpu_idx for invalidation tracking 



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: default avatarZenghui Yu <yuzenghui@huawei.com>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230927090911.3355209-7-maz@kernel.org


Signed-off-by: default avatarOliver Upton <oliver.upton@linux.dev>
parent ac0fe56d

arch/arm64/kvm/arm.c

+2 −2
Original line number Diff line number Diff line
@@ -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;