Greetings Alex, > Sent: Wednesday, August 12, 2020 at 8:04 PM > From: "Alex Williamson" <alex.william...@redhat.com> > To: "Patrick O'Callaghan" <p...@usb.ve> > Cc: vfio-users@redhat.com, "daggs" <da...@gmx.com> > Subject: Re: [vfio-users] pci passthrough of Intel igp > > On Wed, 12 Aug 2020 17:46:33 +0100 > "Patrick O'Callaghan" <p...@usb.ve> wrote: > > > On Wed, 2020-08-12 at 18:02 +0200, daggs wrote: > > > Greetings, > > > > > > I have a machine with an Intel igp of HD Graphics 610 [8086:5902]. > > > I found several discussions on the subject stating that it isn't possible > > > but all of them are several years old. > > > so I wanted to know if it is possible to pass it to a vm? > > > I'm using kernel 5.4.43, libvirt-6.6.0 and qemu-5.0.0. > > > > If this is your only GPU, it doesn't make much sense. The idea of > > passthrough is to let the VM control an additional GPU, not the main > > one. > > There are plenty of people trying to assign their primary graphics > device, it makes perfect sense for someone that doesn't intend to run a > graphical environment on the host. Assigning the primary GPU can be > more challenging, but that doesn't mean it isn't done. > > For daggs, I can only say try it yourself, I don't know of any specific > reason it wouldn't work, but direct assignment of IGD is a fair bit of > luck anyway since the hardware is constantly changing and we don't > really keep up with it. You might need to play with the x-igd-gms > value on the vfio-pci device in QEMU, several people have found that > x-igd-gms=1 is necessary on some versions of hardware. Thanks, > > Alex > >
I'm trying to boot the vm up with the igd pass-through, here is my xml: https://dpaste.com/CNDHRLNXC the boot ends up with no signal and this is visible in dmesg: [ 36.181635] DMAR: DRHD: handling fault status reg 3 [ 36.181641] DMAR: [DMA Read] Request device [00:02.0] PASID ffffffff fault addr c6000000 [fault reason 06] PTE Read access is not set [ 36.182298] DMAR: DRHD: handling fault status reg 3 [ 36.182304] DMAR: [DMA Read] Request device [00:02.0] PASID ffffffff fault addr c603d000 [fault reason 06] PTE Read access is not set [ 36.183459] DMAR: DRHD: handling fault status reg 3 [ 36.183464] DMAR: [DMA Read] Request device [00:02.0] PASID ffffffff fault addr c603e000 [fault reason 06] PTE Read access is not set [ 36.184614] DMAR: DRHD: handling fault status reg 3 [ 36.721979] vfio-pci 0000:00:02.0: vfio_ecap_init: hiding ecap 0x1b@0x100 I've dumped the rom, do I need to run the fixer on it? if so, what is the vid and did? than I need to place this <rom file='/home/streamer/vga.rom'/> in the hostdev section? I've noticed most of the reports say it works only on i440fx but they are all a few years old, is that still the case? as part of this contexts, I have this in the kernel cmdline: pcie_acs_override=id:8086:a170 does it means device 8086:a170 is "broken" out of the iommu table? Thanks, Dagg. _______________________________________________ vfio-users mailing list vfio-users@redhat.com https://www.redhat.com/mailman/listinfo/vfio-users
