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| author | Eddie Dong <eddie.dong@intel.com> | 2007-12-18 06:08:27 +0800 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-01-30 18:01:19 +0200 |
| commit | caa5b8a5ed27708521e0667649699fea202043b2 (patch) | |
| tree | 23674e64cdce6a528ec9a8c2a071473bf0104713 /arch/x86 | |
| parent | ec10f4750db5e810cafef114a592428f8242b640 (diff) | |
| download | linux-stable-caa5b8a5ed27708521e0667649699fea202043b2.tar.gz linux-stable-caa5b8a5ed27708521e0667649699fea202043b2.tar.bz2 linux-stable-caa5b8a5ed27708521e0667649699fea202043b2.zip | |
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 <eddie.dong@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | 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 401eb7ce3207..9a57e1a01449 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 |