KVM: move postcommit flush to x86, as mmio sptes are x86 specific

Other arches do not need this.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

v2: fix incorrect deletion of mmio sptes on gpa move (noticed by Takuya)
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 37797a090a8f..6f6812ec8419 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6445,6 +6445,14 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
                 kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
         kvm_mmu_slot_remove_write_access(kvm, mem->slot);
         spin_unlock(&kvm->mmu_lock);
+        /*
+         * If memory slot is created, or moved, we need to clear all
+         * mmio sptes.
+         */
+        if (npages && old.base_gfn != mem->guest_phys_addr >> PAGE_SHIFT) {
+                kvm_mmu_zap_all(kvm);
+                kvm_reload_remote_mmus(kvm);
+        }
 }
 
 void kvm_arch_flush_shadow_all(struct kvm *kvm)