tree bac40f2901c66004ecda57f00c0b35a897734f3e
parent ed4fbd10823a7b0dbded6b481a68973e47f7e14d
author Orit Wasserman <owasserm@redhat.com> 1374514181 +0300
committer Juan Quintela <quintela@redhat.com> 1374582970 +0200

Fix real mode guest migration

Older KVM versions save CS dpl value to an invalid value for real mode guests
(0x3). This patch detect this situation when loading CPU state and set all the
segments dpl to zero.
This will allow migration from older KVM on host without unrestricted guest
to hosts with restricted guest support.
For example migration from a Penryn host (with kernel 2.6.32) to
a Westmere host (for real mode guest) will fail with "kvm: unhandled exit 80000021".

Signed-off-by: Orit Wasserman <owasserm@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>