| commit | fda45f0be5c9d1671b6bc5b35b6143360f2b10bd | |
| author | Ben Hutchings <ben@decadent.org.uk> | |
| Mon, 29 Nov 2010 15:00:15 +0000 (29 13:00 -0200) | ||
| committer | Greg Kroah-Hartman <gregkh@suse.de> | |
| Thu, 9 Dec 2010 21:26:48 +0000 (9 13:26 -0800) | ||
| tree | 77c18fad57a70651c7ec6e7b43c88e648523107d | treesnapshot (tar.gz zip) |
| parent | 91445a8f6fee2f78680bae847cabe237a6e57eb9 | commitdiff |
KVM: VMX: Fix host userspace gsbase corruption
commit c8770e7ba63bb5dd8fe5f9d251275a8fa717fb78 upstream.
We now use load_gs_index() to load gs safely; unfortunately this also
changes MSR_KERNEL_GS_BASE, which we managed separately. This resulted
in confusion and breakage running 32-bit host userspace on a 64-bit kernel.
Fix by
- saving guest MSR_KERNEL_GS_BASE before we we reload the host's gs
- doing the host save/load unconditionally, instead of only when in guest
long mode
Things can be cleaned up further, but this is the minmal fix for now.
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
[bwh: Backport to 2.6.32]
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
commit c8770e7ba63bb5dd8fe5f9d251275a8fa717fb78 upstream.
We now use load_gs_index() to load gs safely; unfortunately this also
changes MSR_KERNEL_GS_BASE, which we managed separately. This resulted
in confusion and breakage running 32-bit host userspace on a 64-bit kernel.
Fix by
- saving guest MSR_KERNEL_GS_BASE before we we reload the host's gs
- doing the host save/load unconditionally, instead of only when in guest
long mode
Things can be cleaned up further, but this is the minmal fix for now.
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
[bwh: Backport to 2.6.32]
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| arch/x86/kvm/vmx.c | diffblobblamehistory |