Am 28.10.2013 um 20:01 hat Michael S. Tsirkin geschrieben: > From: Alexander Graf <ag...@suse.de> > > When AHCI executes an asynchronous IDE command, it checked DRDY without > checking either DRQ or BSY. This sometimes caused interrupt to be sent > before command is actually completed. > > This resulted in a race condition: if guest then managed to access the > device before command has completed, it would hang waiting for an > interrupt. > This was observed with windows 7 guests. > > To fix, check for DRQ or BSY in additiona to DRDY, if set, > the command is asynchronous so delay the interrupt until > asynchronous done callback is invoked. > > Reported-by: Michael S. Tsirkin <m...@redhat.com> > Reviewed-by: Michael S. Tsirkin <m...@redhat.com> > Tested-by: Michael S. Tsirkin <m...@redhat.com> > Signed-off-by: Michael S. Tsirkin <m...@redhat.com>
Thanks, applied to the block branch. Kevin
