On Wed, Jul 01, 2015 at 02:30:29PM +0200, Gerd Hoffmann wrote: > On Mi, 2015-07-01 at 10:08 +0200, Michael S. Tsirkin wrote: > > On Tue, Jun 30, 2015 at 10:38:53AM +0200, Gerd Hoffmann wrote: > > > virtio version 1.0 registers can (and actually do in the qemu > > > implementation) live in mmio space. So we must run the blk and > > > scsi virtio drivers in 32bit mode, otherwise we can't access them. > > > > > > This also allows to drop a bunch of GET_LOWFLAT calls from the virtio > > > code in the following patches. > > > > > > Signed-off-by: Gerd Hoffmann <kra...@redhat.com> > > > > Is there an advantage to running them in a 16 bit mode? > > Not really any more. Switching from 32bit mode back to > whatever-was-active-before used to be problematic before we had smm mode > support. In theory. Because you can't save/restore the complete x86 > processor state. In practice we had surprisingly few problems, > appearently linux boot loaders simply don't play dirty tricks. > > cheers, > Gerd >
Interesting. Might not be true for non-linux loaders :) Anyway we support SSM now so all should be well, right? -- MST
