Commit 4677a3b6 authored by Avi Kivity's avatar Avi Kivity

KVM: MMU: Optimize page unshadowing

Using kvm_mmu_lookup_page() will result in multiple scans of the hash chains;
use hlist_for_each_entry_safe() to achieve a single scan instead.
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent c8a73f18
......@@ -1471,11 +1471,20 @@ static int kvm_mmu_unprotect_page(struct kvm *kvm, gfn_t gfn)
static void mmu_unshadow(struct kvm *kvm, gfn_t gfn)
{
unsigned index;
struct hlist_head *bucket;
struct kvm_mmu_page *sp;
struct hlist_node *node, *nn;
while ((sp = kvm_mmu_lookup_page(kvm, gfn)) != NULL) {
pgprintk("%s: zap %lx %x\n", __func__, gfn, sp->role.word);
kvm_mmu_zap_page(kvm, sp);
index = kvm_page_table_hashfn(gfn);
bucket = &kvm->arch.mmu_page_hash[index];
hlist_for_each_entry_safe(sp, node, nn, bucket, hash_link) {
if (sp->gfn == gfn && !sp->role.metaphysical
&& !sp->role.invalid) {
pgprintk("%s: zap %lx %x\n",
__func__, gfn, sp->role.word);
kvm_mmu_zap_page(kvm, sp);
}
}
}
......
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