From caa5b8a5ed27708521e0667649699fea202043b2 Mon Sep 17 00:00:00 2001 From: Eddie Dong Date: Tue, 18 Dec 2007 06:08:27 +0800 Subject: [PATCH] KVM: MMU: Coalesce remote tlb flushes Host side TLB flush can be merged together if multiple spte need to be write-protected. Signed-off-by: Yaozu (Eddie) Dong Signed-off-by: Avi Kivity --- arch/x86/kvm/mmu.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 401eb7ce32..9a57e1a014 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 -- 2.39.5