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KVM: MMU: allow more page become unsync at getting sp time

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Allow more page become asynchronous at getting sp time, if need create new
shadow page for gfn but it not allow unsync(level > 1), we should unsync all
gfn's unsync page

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Xiao Guangrong 2010-05-24 15:41:33 +08:00 committed by Avi Kivity
parent 9cf5cf5ad4
commit 9f1a122f97
1 changed files with 37 additions and 10 deletions
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47
arch/x86/kvm/mmu.c
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@ -1220,6 +1220,35 @@ static int kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
return __kvm_sync_page(vcpu, sp, true);
}
/* @gfn should be write-protected at the call site */
static void kvm_sync_pages(struct kvm_vcpu *vcpu, gfn_t gfn)
{
struct hlist_head *bucket;
struct kvm_mmu_page *s;
struct hlist_node *node, *n;
unsigned index;
bool flush = false;
index = kvm_page_table_hashfn(gfn);
bucket = &vcpu->kvm->arch.mmu_page_hash[index];
hlist_for_each_entry_safe(s, node, n, bucket, hash_link) {
if (s->gfn != gfn || !s->unsync || s->role.invalid)
continue;
WARN_ON(s->role.level != PT_PAGE_TABLE_LEVEL);
if ((s->role.cr4_pae != !!is_pae(vcpu)) ||
(vcpu->arch.mmu.sync_page(vcpu, s))) {
kvm_mmu_zap_page(vcpu->kvm, s);
continue;
}
kvm_unlink_unsync_page(vcpu->kvm, s);
flush = true;
}
if (flush)
kvm_mmu_flush_tlb(vcpu);
}
struct mmu_page_path {
struct kvm_mmu_page *parent[PT64_ROOT_LEVEL-1];
unsigned int idx[PT64_ROOT_LEVEL-1];
@ -1318,8 +1347,9 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
unsigned index;
unsigned quadrant;
struct hlist_head *bucket;
struct kvm_mmu_page *sp, *unsync_sp = NULL;
struct kvm_mmu_page *sp;
struct hlist_node *node, *tmp;
bool need_sync = false;
role = vcpu->arch.mmu.base_role;
role.level = level;
@ -1336,17 +1366,14 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
bucket = &vcpu->kvm->arch.mmu_page_hash[index];
hlist_for_each_entry_safe(sp, node, tmp, bucket, hash_link)
if (sp->gfn == gfn) {
if (sp->unsync)
unsync_sp = sp;
if (!need_sync && sp->unsync)
need_sync = true;
if (sp->role.word != role.word)
continue;
if (!direct && unsync_sp &&
kvm_sync_page_transient(vcpu, unsync_sp)) {
unsync_sp = NULL;
if (sp->unsync && kvm_sync_page_transient(vcpu, sp))
break;
}
mmu_page_add_parent_pte(vcpu, sp, parent_pte);
if (sp->unsync_children) {
@ -1358,9 +1385,6 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
trace_kvm_mmu_get_page(sp, false);
return sp;
}
if (!direct && unsync_sp)
kvm_sync_page(vcpu, unsync_sp);
++vcpu->kvm->stat.mmu_cache_miss;
sp = kvm_mmu_alloc_page(vcpu, parent_pte);
if (!sp)
@ -1371,6 +1395,9 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
if (!direct) {
if (rmap_write_protect(vcpu->kvm, gfn))
kvm_flush_remote_tlbs(vcpu->kvm);
if (level > PT_PAGE_TABLE_LEVEL && need_sync)
kvm_sync_pages(vcpu, gfn);
account_shadowed(vcpu->kvm, gfn);
}
if (shadow_trap_nonpresent_pte != shadow_notrap_nonpresent_pte)