On 25.04.23 10:43, Michael S. Tsirkin wrote:
On Tue, Apr 25, 2023 at 03:26:54AM -0400, Michael S. Tsirkin wrote:
On Mon, Apr 24, 2023 at 11:36:47PM +0300, Vladimir Sementsov-Ogievskiy wrote:
On migration, on target we load local ROM file. But actual ROM content
migrates through migration channel. Original ROM content from local
file doesn't matter. But when size mismatch - we have an error like
Size mismatch: 0000:00:03.0/virtio-net-pci.rom: 0x40000 != 0x80000: Invalid
argument
Oh, this is this old bug then:
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1713490
People seem to be "fixing" this by downgrading ROMs.
Actually, I think the fix is different: we need to build
versions of ROMs for old machine types that can fit
in the old BAR size.
Gerd, Laszlo what's your take on all this?
Actually, ignore this - we do keep old ROMs around specifically to avoid
ROM size changes and have been for ever. E.g.:
commit c45e5b5b30ac1f5505725a7b36e68cedfce4f01f
Author: Gerd Hoffmann<kra...@redhat.com>
Date: Tue Feb 26 17:46:11 2013 +0100
Switch to efi-enabled nic roms by default
All PCI nics are switched to EFI-enabled roms by default. They are
composed from three images (legacy, efi ia32 & efi x86), so classic
pxe booting will continue to work.
Exception: eepro100 is not switched, it uses a single rom for all
emulated eepro100 variants, then goes patch the rom header on the
fly with the correct PCI IDs. I doubt that will work as-is with
the efi roms.
Keep old roms for 1.4+older machine types via compat properties,
needed because the efi-enabled roms are larger so the pci rom bar
size would change.
Signed-off-by: Gerd Hoffmann<kra...@redhat.com>
So it's downstream messing up with things, overriding the
rom file then changing its size.
On fedora I find both pxe virtio and efi virtio so it gets it right.
Yes I understand that distribution may work-around the problem just having all
needed roms on target and specifying correct romfile= argument.
But this is not ideal: having the file only to get its size, to not mismatch
with incoming RAM block. There should be way to migrate ROMs automatically
without extra files on target.
--
Best regards,
Vladimir
