Now that kvm_arch_memslots_updated() catches every increment of the
memslots->generation, checking if the mmio generation has reached its
maximum value is enough.
Signed-off-by: Takuya Yoshikawa <yoshikawa_takuya_b1@xxxxxxxxxxxxx>
---
arch/x86/kvm/mmu.c | 5 +----
arch/x86/kvm/x86.c | 10 +++++-----
2 files changed, 6 insertions(+), 9 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 0d094da..bf7af1e 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -4383,11 +4383,8 @@ void kvm_mmu_invalidate_mmio_sptes(struct kvm *kvm)
/*
* The very rare case: if the generation-number is round,
* zap all shadow pages.
- *
- * 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)) {
printk_ratelimited(KERN_INFO "kvm: zapping shadow pages for mmio generation wraparound\n");
kvm_mmu_invalidate_zap_all_pages(kvm);
}
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 71912c9..9be6621 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7022,6 +7022,11 @@ out_free:
void kvm_arch_memslots_updated(struct kvm *kvm)
{
+ /*
+ * memslots->generation has been incremented.
+ * mmio generation may have reached its maximum value.
+ */
+ kvm_mmu_invalidate_mmio_sptes(kvm);
}
int kvm_arch_prepare_memory_region(struct kvm *kvm,
@@ -7084,11 +7089,6 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
*/
if ((change != KVM_MR_DELETE) && (mem->flags & KVM_MEM_LOG_DIRTY_PAGES))
kvm_mmu_slot_remove_write_access(kvm, mem->slot);
- /*
- * If memory slot is created, or moved, we need to clear all
- * mmio sptes.
- */
- kvm_mmu_invalidate_mmio_sptes(kvm);
}
void kvm_arch_flush_shadow_all(struct kvm *kvm)
--
1.7.9.5
--
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