提交 0671a8e7 编写于 作者: X Xiao Guangrong 提交者: Avi Kivity

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

collect remote tlb flush in kvm_mmu_pte_write() path
Signed-off-by: NXiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>
上级 f41d335a
......@@ -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);
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册