diff options
| author | Jan Kiszka <jan.kiszka@siemens.com> | 2011-06-15 15:17:26 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2011-06-19 15:57:56 +0300 |
| commit | 42cc8fa620cbc73e349e96d84cf46469e828ec34 (patch) | |
| tree | e17f4c3bd50bed2edb0791b6b8fc4faa18658f9c /bt-host.c | |
| parent | eb47d7c5d96060040931c42773ee07e61e547af9 (diff) | |
kvm: x86: Save/restore FPU OP, IP and DP
These FPU states are properly maintained by KVM but not yet by TCG. So
far we unconditionally set them to 0 in the guest which may cause
state corruptions, though not with modern guests.
To avoid breaking backward migration, use a conditional subsection that
is only written if any of the three fields is non-zero. The guest's
FNINIT clears them frequently, and cleared IA32_MISC_ENABLE MSR[2]
reduces the probability of non-zero values further so that this
subsection is not expected to restrict migration in any common scenario.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'bt-host.c')
0 files changed, 0 insertions, 0 deletions