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Revision 95c077c9

ID95c077c91900c1420cd4f0be996ffeea6fb6cec8

Added by Jan Kiszka about 13 years ago

kvm: x86: Prevent sign extension of DR7 in guest debugging mode

This unbreaks guest debugging when the 4th hardware breakpoint used for
guest debugging is a watchpoint of 4 or 8 byte lenght. The 31st bit of
DR7 is set in that case and used to cause a sign extension to the high
word which was breaking the guest state (vm entry failure).

Signed-off-by: Jan Kiszka <>
Signed-off-by: Avi Kivity <>

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