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KVM: MMU: reduce remote tlb flush in kvm_mmu_pte_write()

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collect remote tlb flush in kvm_mmu_pte_write() path

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Xiao Guangrong 2010-06-04 21:56:59 +08:00 committed by Avi Kivity
parent f41d335a02
commit 0671a8e75d
1 changed files with 15 additions and 5 deletions
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20
arch/x86/kvm/mmu.c
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@ -2666,11 +2666,15 @@ static bool need_remote_flush(u64 old, u64 new)
return (old & ~new & PT64_PERM_MASK) != 0;
}
static void mmu_pte_write_flush_tlb(struct kvm_vcpu *vcpu, u64 old, u64 new)
static void mmu_pte_write_flush_tlb(struct kvm_vcpu *vcpu, bool zap_page,
bool remote_flush, bool local_flush)
{
if (need_remote_flush(old, new))
if (zap_page)
return;
if (remote_flush)
kvm_flush_remote_tlbs(vcpu->kvm);
else
else if (local_flush)
kvm_mmu_flush_tlb(vcpu);
}
@ -2735,6 +2739,9 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
int npte;
int r;
int invlpg_counter;
bool remote_flush, local_flush, zap_page;
zap_page = remote_flush = local_flush = false;
pgprintk("%s: gpa %llx bytes %d\n", __func__, gpa, bytes);
@ -2808,7 +2815,7 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
*/
pgprintk("misaligned: gpa %llx bytes %d role %x\n",
gpa, bytes, sp->role.word);
kvm_mmu_prepare_zap_page(vcpu->kvm, sp,
zap_page |= !!kvm_mmu_prepare_zap_page(vcpu->kvm, sp,
&invalid_list);
++vcpu->kvm->stat.mmu_flooded;
continue;
@ -2833,16 +2840,19 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
if (quadrant != sp->role.quadrant)
continue;
}
local_flush = true;
spte = &sp->spt[page_offset / sizeof(*spte)];
while (npte--) {
entry = *spte;
mmu_pte_write_zap_pte(vcpu, sp, spte);
if (gentry)
mmu_pte_write_new_pte(vcpu, sp, spte, &gentry);
mmu_pte_write_flush_tlb(vcpu, entry, *spte);
if (!remote_flush && need_remote_flush(entry, *spte))
remote_flush = true;
++spte;
}
}
mmu_pte_write_flush_tlb(vcpu, zap_page, remote_flush, local_flush);
kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list);
kvm_mmu_audit(vcpu, "post pte write");
spin_unlock(&vcpu->kvm->mmu_lock);