tree 714358f2e6229e699740bc249b2327b10ba67854
parent 3be2264be3c00865116f997dc53ebcc90fe7fc4b
author Avi Kivity <avi@redhat.com> 1274960158 +0300
committer Avi Kivity <avi@redhat.com> 1276098517 +0300

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>