Messages in this thread Patch in this message | | | From | Avi Kivity <> | Subject | [PATCH 21/33] KVM: MMU: Coalesce remote tlb flushes | Date | Sun, 6 Jan 2008 16:39:27 +0200 |
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From: Eddie Dong <eddie.dong@intel.com>
Host side TLB flush can be merged together if multiple spte need to be write-protected.
Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com> --- 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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