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KVM: MMU: coalesce more page zapping in mmu_sync_children 

mmu_sync_children can only process up to 16 pages at a time.  Check
if we need to reschedule, and do not bother zapping the pages until
that happens.

Reviewed-by: Takuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
hifive-unleashed-5.1
Paolo Bonzini 2016-02-25 10:47:38 +01:00
parent 2a74003ae8
commit 50c9e6f3a6
1 changed files with 11 additions and 4 deletions
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15
arch/x86/kvm/mmu.c
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@ -2059,24 +2059,31 @@ static void mmu_sync_children(struct kvm_vcpu *vcpu,
struct mmu_page_path parents;
struct kvm_mmu_pages pages;
LIST_HEAD(invalid_list);
bool flush = false;
while (mmu_unsync_walk(parent, &pages)) {
bool protected = false;
bool flush = false;
for_each_sp(pages, sp, parents, i)
protected |= rmap_write_protect(vcpu, sp->gfn);
if (protected)
if (protected) {
kvm_flush_remote_tlbs(vcpu->kvm);
flush = false;
}
for_each_sp(pages, sp, parents, i) {
flush |= kvm_sync_page(vcpu, sp, &invalid_list);
mmu_pages_clear_parents(&parents);
}
kvm_mmu_flush_or_zap(vcpu, &invalid_list, false, flush);
cond_resched_lock(&vcpu->kvm->mmu_lock);
if (need_resched() || spin_needbreak(&vcpu->kvm->mmu_lock)) {
kvm_mmu_flush_or_zap(vcpu, &invalid_list, false, flush);
cond_resched_lock(&vcpu->kvm->mmu_lock);
flush = false;
}
}
kvm_mmu_flush_or_zap(vcpu, &invalid_list, false, flush);
}
static void __clear_sp_write_flooding_count(struct kvm_mmu_page *sp)