On 03/21/2013 03:28 AM, Michael S. Tsirkin wrote: > On Thu, Mar 21, 2013 at 06:59:33PM +1030, Rusty Russell wrote: >> Another HPA suggestion: that the device be allowed to offer duplicate >> capabilities, particularly so it can offer a mem and an I/O bar and let >> the guest decide (Linux guest probably doesn't care?). >> >> Cc: H. Peter Anvin <hpa@xxxxxxxxx> >> Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx> > > I think guests is exactly the wrong place to decide, > it really does not know whether it's running on a > hypervisor with fast IO or fast memory. > Also, as long as we have an IO BAR, we have problems allocating it. > So I think we don't need this, see my suggestion > about fixed IO addresses instead. > The reason to support this is that a guest written to only handle one or the other doesn't prevent the hypervisor from offering the other to guests. We probably want to specify that if the guest doesn't care, it should use the first one offered by the host. -hpa _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
