Without this information, users will just see unexpected performance
problems and there is little chance we will get good reports from them:
note that mmio generation is increased even when we just start, or stop,
dirty logging for some memory slot, in which case users should never
expect all shadow pages to be zapped.
Signed-off-by: Takuya Yoshikawa <yoshikawa_takuya_b1@xxxxxxxxxxxxx>
---
arch/x86/kvm/mmu.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index c60c5da..bc8302f 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -4385,8 +4385,10 @@ void kvm_mmu_invalidate_mmio_sptes(struct kvm *kvm)
* The max value is MMIO_MAX_GEN - 1 since it is not called
* when mark memslot invalid.
*/
- if (unlikely(kvm_current_mmio_generation(kvm) >= (MMIO_MAX_GEN - 1)))
+ if (unlikely(kvm_current_mmio_generation(kvm) >= (MMIO_MAX_GEN - 1))) {
+ printk(KERN_INFO "kvm: zapping shadow pages for mmio generation wraparound");
kvm_mmu_invalidate_zap_all_pages(kvm);
+ }
}
static int mmu_shrink(struct shrinker *shrink, struct shrink_control *sc)
--
1.7.9.5
--
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