[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] qemu-xen-dir + PCI passthrough = BOOM
On Wed, 2013-12-18 at 10:22 -0500, Konrad Rzeszutek Wilk wrote: > load_roms and bios_load are not set - so it wouldn't even do it. > It only does it for Bochs BIOS. Right, this is deliberate. For ROMBIOS (AKA BOchs BIOS) hvmloader loads the options roms. and I think ROMBIOS subsequently loads them. For SeaBIOS it is the BIOS itself which both loads and executes the ROMS, which is why it is NULL in hvmloader. The SeaBIOS way is far more like how systems normally work and because the BIOS is in charge it can do a better job than splitting it between two entities. Seems like perhaps I was mistaken about hvmloader+rombios not supporting loading from the ROM BAR of the device, it does seem to have some limited support for that (serial controllers and disk controllers only) hvmloader+rombios does hardcode the VGA bios (rather than getting it from the emulated devices ROM bar), which is probably what I was thinking of, that's why people doing VGA passthrough with rombios need to grab the bios image and build it into hvmloader. hvmloader+rombios also hardcodes the etherboot rom. Ian. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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