KVM/PPC: update the comment of memory barrier in the kvmppc_prepare_to_enter()

[cascardo/linux.git] / arch / powerpc / kvm / powerpc.c

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 19aa59b..6a68730 100644 (file)
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -96,6 +96,9 @@ int kvmppc_prepare_to_enter(struct kvm_vcpu *vcpu)
                 * so we don't miss a request because the requester sees
                 * OUTSIDE_GUEST_MODE and assumes we'll be checking requests
                 * before next entering the guest (and thus doesn't IPI).
+                * This also orders the write to mode from any reads
+                * to the page tables done while the VCPU is running.
+                * Please see the comment in kvm_flush_remote_tlbs.
                 */
                smp_mb();