KVM: VMX: Fix host userspace gsbase corruption

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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>

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Avi Kivity 2010-11-11 12:37:26 +02:00 • committed by Marcelo Tosatti

parent 0a77fe4c18

commit c8770e7ba6

1 changed files with 7 additions and 8 deletions

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arch/x86/kvm/vmx.c

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