+Andrea; comments below On 08/08/18 23:11, Alex Williamson wrote: > On Wed, 8 Aug 2018 14:11:16 +0200 > Gerd Hoffmann <kra...@redhat.com> wrote: > >> On Sun, Jul 29, 2018 at 01:49:10PM +0200, Konrad Eisele wrote: >>> I'm passing through a Marvell 88SE9230 card to a KVM guest under >>> Ubuntu 18.04. The card is a Sata controller with 4 ports. >>> The option rom of the Marvell 88SE9230 card shows on a normal boot a >>> bios screen. When pressing CTRL-m quick enough, you can interrupt the >>> bootprocess and enter a menue wherer you can define raid >>> arrays. >>> >>> When booting seabios inside KVM the bootprocess is very slow. >>> There is a 1 min holdtime where the cpu is about 30%. The screen is >>> black with only the seabios version string shown. I suspect that >>> the passed-through Marvell 88SE9230 cards option roms causes this >>> behaviour. >>> Maybe the scanning for option rom cause the slow bootprocess? >>> >>> In the seabios boot case no bios menue is shown, after >>> around 1 min the boot continues. >>> >>> Is it possible to disable the options rom processing? Is there some >>> documentation about this (How can I configure it for Ubuntu) ? >> >> Set the romfile option to the empty string (for vfio-pci, on the qemu >> command line) should do that (qemu will not expose the rom to the guest >> then). > > Typically rombar=0 on the QEMU command line is how to disable the option > ROM for an assigned device, or > > <rom bar='off'/> > > in libvirt. Thanks,
On a tangent: Not sure about assigned devices, but for emulated devices, romfile='' "scales" better. With rombar=0, the oprom is still loaded into fw_cfg as a "genrom", and if multiple devices of the same type attempt to do that, the genroms will conflict, and QEMU will not launch: https://bugzilla.redhat.com/show_bug.cgi?id=1425058#c19 For this reason (as well), libvirt now supports a further attribute for the <rom> element, namely @enabled. It maps to the "romfile" property: https://bugzilla.redhat.com/show_bug.cgi?id=1425058#c34 By now I've updated all my long-term domains that used to specify <rom bar='off'/>, to <rom enabled='no'/>. Thanks! Laszlo _______________________________________________ SeaBIOS mailing list SeaBIOS@seabios.org https://mail.coreboot.org/mailman/listinfo/seabios