From: Eddie Dong <[EMAIL PROTECTED]>

Host side TLB flush can be merged together if multiple
spte need to be write-protected.

Signed-off-by: Yaozu (Eddie) Dong <[EMAIL PROTECTED]>
Signed-off-by: Avi Kivity <[EMAIL PROTECTED]>
---
 arch/x86/kvm/mmu.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 401eb7c..9a57e1a 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -513,6 +513,7 @@ static void rmap_write_protect(struct kvm *kvm, u64 gfn)
 {
        unsigned long *rmapp;
        u64 *spte;
+       int write_protected = 0;
 
        gfn = unalias_gfn(kvm, gfn);
        rmapp = gfn_to_rmap(kvm, gfn);
@@ -522,11 +523,14 @@ static void rmap_write_protect(struct kvm *kvm, u64 gfn)
                BUG_ON(!spte);
                BUG_ON(!(*spte & PT_PRESENT_MASK));
                rmap_printk("rmap_write_protect: spte %p %llx\n", spte, *spte);
-               if (is_writeble_pte(*spte))
+               if (is_writeble_pte(*spte)) {
                        set_shadow_pte(spte, *spte & ~PT_WRITABLE_MASK);
-               kvm_flush_remote_tlbs(kvm);
+                       write_protected = 1;
+               }
                spte = rmap_next(kvm, rmapp, spte);
        }
+       if (write_protected)
+               kvm_flush_remote_tlbs(kvm);
 }
 
 #ifdef MMU_DEBUG
-- 
1.5.3.7


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