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KVM: MMU: filter out the mmio pfn from the fault pfn

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If the page fault is caused by mmio, the gfn can not be found in memslots, and
'bad_pfn' is returned on gfn_to_hva path, so we can use 'bad_pfn' to identify
the mmio page fault.
And, to clarify the meaning of mmio pfn, we return fault page instead of bad
page when the gfn is not allowd to prefetch

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Xiao Guangrong
2011-07-12 03:28:54 +08:00
committed by Avi Kivity
parent c37079586f
commit fce92dce79
3 changed files with 21 additions and 4 deletions
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4
arch/x86/kvm/mmu.c
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@@ -2085,8 +2085,8 @@ static pfn_t pte_prefetch_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn,
slot = gfn_to_memslot_dirty_bitmap(vcpu, gfn, no_dirty_log);
if (!slot) {
get_page(bad_page);
return page_to_pfn(bad_page);
get_page(fault_page);
return page_to_pfn(fault_page);
}
hva = gfn_to_hva_memslot(slot, gfn);