Re: [Qemu-devel] [PATCH v4 2/2] loader: store FW CFG ROM files in RAM

2013-08-19 Thread Laszlo Ersek
On 08/19/13 16:26, Michael S. Tsirkin wrote: > ROM files that are put in FW CFG are copied to guest ram, by BIOS, but > they are not backed by RAM so they don't get migrated. > > Each time we change two bytes in such a ROM this breaks cross-version > migration: since we can migrate after BIOS has

Re: [Qemu-devel] [PATCH v4 2/2] loader: store FW CFG ROM files in RAM

2013-08-19 Thread Paolo Bonzini
Il 19/08/2013 19:40, Michael S. Tsirkin ha scritto: > On Mon, Aug 19, 2013 at 07:28:12PM +0200, Paolo Bonzini wrote: >> Il 19/08/2013 16:26, Michael S. Tsirkin ha scritto: >>> ROM files that are put in FW CFG are copied to guest ram, by BIOS, but >>> they are not backed by RAM so they don't get mig

Re: [Qemu-devel] [PATCH v4 2/2] loader: store FW CFG ROM files in RAM

2013-08-19 Thread Michael S. Tsirkin
On Mon, Aug 19, 2013 at 07:28:12PM +0200, Paolo Bonzini wrote: > Il 19/08/2013 16:26, Michael S. Tsirkin ha scritto: > > ROM files that are put in FW CFG are copied to guest ram, by BIOS, but > > they are not backed by RAM so they don't get migrated. > > > > Each time we change two bytes in such a

Re: [Qemu-devel] [PATCH v4 2/2] loader: store FW CFG ROM files in RAM

2013-08-19 Thread Paolo Bonzini
Il 19/08/2013 16:26, Michael S. Tsirkin ha scritto: > ROM files that are put in FW CFG are copied to guest ram, by BIOS, but > they are not backed by RAM so they don't get migrated. > > Each time we change two bytes in such a ROM this breaks cross-version > migration: since we can migrate after BI