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KVM: MMU: Remove user access when allowing kernel access to gpte.w=0 page
authorAvi Kivity <avi@redhat.com>
Thu, 27 May 2010 11:35:58 +0000 (14:35 +0300)
committerAvi Kivity <avi@redhat.com>
Wed, 9 Jun 2010 15:48:37 +0000 (18:48 +0300)
commit69325a122580d3a7b26589e8efdd6663001c3297
tree714358f2e6229e699740bc249b2327b10ba67854tree | snapshot (tar.gz zip)
parent3be2264be3c00865116f997dc53ebcc90fe7fc4bcommit | diff
KVM: MMU: Remove user access when allowing kernel access to gpte.w=0 page

If cr0.wp=0, we have to allow the guest kernel access to a page with pte.w=0.
We do that by setting spte.w=1, since the host cr0.wp must remain set so the
host can write protect pages.  Once we allow write access, we must remove
user access otherwise we mistakenly allow the user to write the page.

Reviewed-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
arch/x86/kvm/mmu.c diff | blob | blame | history