On Thu, Mar 31, 2011 at 01:33:58PM -0500, Anthony Liguori wrote: > On 03/31/2011 12:43 PM, Michael S. Tsirkin wrote: > >Currently, vga cards that allocate vga ram, > >register it as regular ram. When this happens > >a lot, vhost need to get notified and flush > >its memory tables, which is slow. > > > >This was observed with cirrus vga. > > > >As a solution, add an explicit flag when > >registering vga ram, vhost-net can simply ignore it. > > > >Long term, we might be able to use this API > >to avoid the need to request > >dirty loggin from devices explicitly. > > > >Tested: with cirrus vga only. > > > >Signed-off-by: Michael S. Tsirkin<m...@redhat.com> > > Treating vga specially is not the right approach. > > You want to treat real RAM specially and only make that visible to > vhost. See http://wiki.qemu.org/Features/RamAPI
That seems like a dead project? And VGa is unhandled there. > There is nothing special about VGA. It is special in that guest can control host virtual to guest physical mappings. In this VGA is similar to IO rather than RAM. -- MST
