KVM: When switching to a vm8086 task, load segments as 16-bit

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According to 16.2.5 in the SDM, eflags.vm in the tss is consulted before loading
and new segments.  If eflags.vm == 1, then the segments are treated as 16-bit
segments.  The LDTR and TR are not normally available in vm86 mode so if they
happen to somehow get loaded, they need to be treated as 32-bit segments.

This fixes an invalid vmentry failure in a custom OS that was happening after
a task switch into vm8086 mode.  Since the segments were being mistakenly
treated as 32-bit, we loaded garbage state.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

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Anthony Liguori 2009-08-11 15:57:59 -05:00 • committed by Avi Kivity

parent 345dcaa8fd

commit c0c7c04b87

1 changed files with 8 additions and 1 deletions

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arch/x86/kvm/x86.c

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