On 06/15/2011 04:17 PM, Jan Kiszka wrote:
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.
Thanks, applied to uq/master. A test migration showed that the
subsection in fact did not show up.
--
error compiling committee.c: too many arguments to function
