| commit | 95c077c91900c1420cd4f0be996ffeea6fb6cec8 | |
| author | Jan Kiszka <jan.kiszka@siemens.com> | |
| Mon, 27 Dec 2010 14:58:23 +0000 (27 15:58 +0100) | ||
| committer | Marcelo Tosatti <mtosatti@redhat.com> | |
| Fri, 21 Jan 2011 16:05:22 +0000 (21 14:05 -0200) | ||
| tree | 8e10e4964371a3b510cc0f10487327d47dcd8fce | treesnapshot (tar.gz zip) |
| parent | 3980e3024b2d1677a9910de5e35d22d5d8392522 | commitdiff |
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 <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
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 <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
| target-i386/kvm.c | diffblobblamehistory |