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| author | Mark Brown <broonie@kernel.org> | 2016-03-21 17:08:52 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2016-03-21 17:08:52 +0000 |
| commit | 5c1af2f870ab94f94f9dff231c6f18845e5a800a (patch) | |
| tree | 9cebefa529103691eab8561449c00d43d6420b34 /Documentation/virtual/kvm/mmu.txt | |
| parent | c35983d487b56c023b70d6727ad002b19f935827 (diff) | |
| parent | 917a9133a6b3c6cc2b6b5649d28c617a4ccac3e6 (diff) | |
Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-rtlsk-v4.4-16.03-rt
Diffstat (limited to 'Documentation/virtual/kvm/mmu.txt')
| -rw-r--r-- | Documentation/virtual/kvm/mmu.txt | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/virtual/kvm/mmu.txt b/Documentation/virtual/kvm/mmu.txt index 3a4d681c3e98..b653641d4261 100644 --- a/Documentation/virtual/kvm/mmu.txt +++ b/Documentation/virtual/kvm/mmu.txt @@ -358,7 +358,8 @@ In the first case there are two additional complications: - if CR4.SMEP is enabled: since we've turned the page into a kernel page, the kernel may now execute it. We handle this by also setting spte.nx. If we get a user fetch or read fault, we'll change spte.u=1 and - spte.nx=gpte.nx back. + spte.nx=gpte.nx back. For this to work, KVM forces EFER.NX to 1 when + shadow paging is in use. - if CR4.SMAP is disabled: since the page has been changed to a kernel page, it can not be reused when CR4.SMAP is enabled. We set CR4.SMAP && !CR0.WP into shadow page's role to avoid this case. Note, |