KVM: MMU: fix direct sp's access corrupted

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If the mapping is writable but the dirty flag is not set, we will find
the read-only direct sp and setup the mapping, then if the write #PF
occur, we will mark this mapping writable in the read-only direct sp,
now, other real read-only mapping will happily write it without #PF.

It may hurt guest's COW

Fixed by re-install the mapping when write #PF occur.

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

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Xiao Guangrong 2010-06-30 16:03:28 +08:00 • committed by Avi Kivity

parent 5fd5387c89

commit 9e7b0e7fba

1 changed files with 26 additions and 2 deletions

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arch/x86/kvm/paging_tmpl.h

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