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KVM: MMU: fix release noslot pfn

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We can not directly call kvm_release_pfn_clean to release the pfn
since we can meet noslot pfn which is used to cache mmio info into
spte

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Xiao Guangrong 2012-10-16 20:07:03 +08:00 committed by Avi Kivity
parent ecefbd94b8
commit f3ac1a4b66
2 changed files with 2 additions and 5 deletions
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3
arch/x86/kvm/mmu.c
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@ -2497,8 +2497,7 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
} }
} }
if (!is_error_pfn(pfn)) kvm_release_pfn_clean(pfn);
kvm_release_pfn_clean(pfn);
} }
static void nonpaging_new_cr3(struct kvm_vcpu *vcpu) static void nonpaging_new_cr3(struct kvm_vcpu *vcpu)

4
virt/kvm/kvm_main.c
View File

@ -1322,9 +1322,7 @@ EXPORT_SYMBOL_GPL(kvm_release_page_clean);
void kvm_release_pfn_clean(pfn_t pfn) void kvm_release_pfn_clean(pfn_t pfn)
{ {
WARN_ON(is_error_pfn(pfn)); if (!is_error_pfn(pfn) && !kvm_is_mmio_pfn(pfn))
if (!kvm_is_mmio_pfn(pfn))
put_page(pfn_to_page(pfn)); put_page(pfn_to_page(pfn));
} }
EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);