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KVM: MMU: awareness of new kvm_mmu_zap_page behaviour

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kvm_mmu_zap_page will soon zap the unsynced children of a page. Restart
list walk in such case.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Marcelo Tosatti 2008-09-23 13:18:37 -03:00 committed by Avi Kivity
parent ad8cfbe3ff
commit 0738541396
1 changed files with 9 additions and 4 deletions
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13
arch/x86/kvm/mmu.c
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@ -1078,7 +1078,7 @@ static void kvm_mmu_unlink_parents(struct kvm *kvm, struct kvm_mmu_page *sp)
} }
} }
static void kvm_mmu_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp) static int kvm_mmu_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp)
{ {
++kvm->stat.mmu_shadow_zapped; ++kvm->stat.mmu_shadow_zapped;
kvm_mmu_page_unlink_children(kvm, sp); kvm_mmu_page_unlink_children(kvm, sp);
@ -1095,6 +1095,7 @@ static void kvm_mmu_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp)
kvm_reload_remote_mmus(kvm); kvm_reload_remote_mmus(kvm);
} }
kvm_mmu_reset_last_pte_updated(kvm); kvm_mmu_reset_last_pte_updated(kvm);
return 0;
} }
/* /*
@ -1147,8 +1148,9 @@ static int kvm_mmu_unprotect_page(struct kvm *kvm, gfn_t gfn)
if (sp->gfn == gfn && !sp->role.metaphysical) { if (sp->gfn == gfn && !sp->role.metaphysical) {
pgprintk("%s: gfn %lx role %x\n", __func__, gfn, pgprintk("%s: gfn %lx role %x\n", __func__, gfn,
sp->role.word); sp->role.word);
kvm_mmu_zap_page(kvm, sp);
r = 1; r = 1;
if (kvm_mmu_zap_page(kvm, sp))
n = bucket->first;
} }
return r; return r;
} }
@ -1992,7 +1994,8 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
*/ */
pgprintk("misaligned: gpa %llx bytes %d role %x\n", pgprintk("misaligned: gpa %llx bytes %d role %x\n",
gpa, bytes, sp->role.word); gpa, bytes, sp->role.word);
kvm_mmu_zap_page(vcpu->kvm, sp); if (kvm_mmu_zap_page(vcpu->kvm, sp))
n = bucket->first;
++vcpu->kvm->stat.mmu_flooded; ++vcpu->kvm->stat.mmu_flooded;
continue; continue;
} }
@ -2226,7 +2229,9 @@ void kvm_mmu_zap_all(struct kvm *kvm)
spin_lock(&kvm->mmu_lock); spin_lock(&kvm->mmu_lock);
list_for_each_entry_safe(sp, node, &kvm->arch.active_mmu_pages, link) list_for_each_entry_safe(sp, node, &kvm->arch.active_mmu_pages, link)
kvm_mmu_zap_page(kvm, sp); if (kvm_mmu_zap_page(kvm, sp))
node = container_of(kvm->arch.active_mmu_pages.next,
struct kvm_mmu_page, link);
spin_unlock(&kvm->mmu_lock); spin_unlock(&kvm->mmu_lock);
kvm_flush_remote_tlbs(kvm); kvm_flush_remote_tlbs(kvm);