From fce92dce79dbf5fff39c7ac2fb149729d79b7a39 Mon Sep 17 00:00:00 2001 From: Xiao Guangrong Date: Tue, 12 Jul 2011 03:28:54 +0800 Subject: KVM: MMU: filter out the mmio pfn from the fault pfn 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 Signed-off-by: Avi Kivity --- arch/x86/kvm/mmu.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'arch') diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 5334b4e9ecc7..96a7ed4e6837 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -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); -- cgit v1.2.3