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KVM: MMU: Coalesce remote tlb flushes

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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>
This commit is contained in:
Eddie Dong 2007-12-18 06:08:27 +08:00 committed by Avi Kivity
parent ec10f4750d
commit caa5b8a5ed
1 changed files with 6 additions and 2 deletions
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8
arch/x86/kvm/mmu.c
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@ -513,6 +513,7 @@ static void rmap_write_protect(struct kvm *kvm, u64 gfn)
{ {
unsigned long *rmapp; unsigned long *rmapp;
u64 *spte; u64 *spte;
int write_protected = 0;
gfn = unalias_gfn(kvm, gfn); gfn = unalias_gfn(kvm, gfn);
rmapp = gfn_to_rmap(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);
BUG_ON(!(*spte & PT_PRESENT_MASK)); BUG_ON(!(*spte & PT_PRESENT_MASK));
rmap_printk("rmap_write_protect: spte %p %llx\n", spte, *spte); 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); set_shadow_pte(spte, *spte & ~PT_WRITABLE_MASK);
kvm_flush_remote_tlbs(kvm); write_protected = 1;
}
spte = rmap_next(kvm, rmapp, spte); spte = rmap_next(kvm, rmapp, spte);
} }
if (write_protected)
kvm_flush_remote_tlbs(kvm);
} }
#ifdef MMU_DEBUG #ifdef MMU_DEBUG