path: root/virt/kvm/iommu.c
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authorAvi Kivity <avi@redhat.com>2010-05-27 14:35:58 +0300
committerAvi Kivity <avi@redhat.com>2010-06-09 18:48:37 +0300
commit69325a122580d3a7b26589e8efdd6663001c3297 (patch)
tree714358f2e6229e699740bc249b2327b10ba67854 /virt/kvm/iommu.c
parent3be2264be3c00865116f997dc53ebcc90fe7fc4b (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>
Diffstat (limited to 'virt/kvm/iommu.c')
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