KVM: MMU: Mark sp mmio cached when creating mmio spte
This will be used not to zap unrelated mmu pages when creating/moving
a memory slot later.
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Takuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index ef7f4a5..9b75cae 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -230,6 +230,7 @@
#endif
int write_flooding_count;
+ bool mmio_cached;
};
struct kvm_pio_request {
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index fdacabb..de45ec1 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -199,8 +199,11 @@
static void mark_mmio_spte(u64 *sptep, u64 gfn, unsigned access)
{
+ struct kvm_mmu_page *sp = page_header(__pa(sptep));
+
access &= ACC_WRITE_MASK | ACC_USER_MASK;
+ sp->mmio_cached = true;
trace_mark_mmio_spte(sptep, gfn, access);
mmu_spte_set(sptep, shadow_mmio_mask | access | gfn << PAGE_SHIFT);
}