On Thu, 27 Aug 2020 23:17:52 +0200 daggs <da...@gmx.com> wrote: > Greetings Alex, > > > Sent: Wednesday, August 26, 2020 at 8:02 PM > > From: "Alex Williamson" <alex.william...@redhat.com> > > To: "daggs" <da...@gmx.com> > > Cc: "Patrick O'Callaghan" <p...@usb.ve>, vfio-users@redhat.com > > Subject: Re: [vfio-users] pci passthrough of Intel igp > > > > On Wed, 26 Aug 2020 07:27:59 +0200 > > daggs <da...@gmx.com> wrote: > > > > > Greetings Alex, > > > > > > > Sent: Wednesday, August 26, 2020 at 12:54 AM > > > > From: "Alex Williamson" <alex.william...@redhat.com> > > > > To: "daggs" <da...@gmx.com> > > > > Cc: "Patrick O'Callaghan" <p...@usb.ve>, vfio-users@redhat.com > > > > Subject: Re: [vfio-users] pci passthrough of Intel igp > > > > > > > > On Tue, 25 Aug 2020 23:34:48 +0200 > > > > daggs <da...@gmx.com> wrote: > > > > > > > > > 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? > > > > > > > > If you dump the ROM and provide it via a <rom> tag in the xml, then yes > > > > you need to fix the device ID and checksum, if QEMU loads it from the > > > > device it will do this itself. You can find the vendor ID (vid) and > > > > device ID (did) with 'lspci -nns 0000:00:02.0", they will be the > > > > numbers in the last set of brackets, ex: [8086:a170]. They're also > > > > available in sysfs under the device: > > > > > > > > $ cat /sys/bus/pci/devices/0000\:00\:02.0/vendor > > > > $ cat /sys/bus/pci/devices/0000\:00\:02.0/device > > > > > > I'll try that and see what happens. > > > > > > > Legacy IGD assignment still requires 440FX due to Q35 placing it's own > > > > device at a conflicting address to the one needed by IGD. > > > > > > duh, my question wasn't clear enough, figures, not the first time I do it. > > > what I meant is do I need Legacy IGD assignment or running the an Q35 > > > machine is enough? > > > the host is booting in uefi mode if it matters to the issue on hand. > > > > "It depends". You're welcome to try Q35 and see if you can get it to > > work, but the Legacy mode specifically depends on having an address > > on the root bus free which is not available on Q35. The UPT/Universal > > PassThrough mode is largely abandoned by Intel AFAICT. > unfortunately UPT ends up in the three DMAR errors above and a black screen. > > > > > If your host is booting in UEFI mode then you may not have a BIOS mode > > ROM available. If you're dumping the ROM, run the parser on it to see > > if it has a BIOS section. If not, you might need to boot the host in > > non-UEFI mode with a live image and see if you get a different ROM in > > that mode. Legacy IGD mode also depends on SeaBIOS support. > it doesn't have a bios section afaics: > Valid ROM signature found @0h, PCIR offset 40h > PCIR: type 0 (x86 PC-AT), vendor: 8086, device: 0406, class: 030000 > PCIR: revision 3, vendor revision: 0 > Last image
That is a BIOS image, an UEFI image would be type 3 (EFI). Note this image is for device ID 0406 where you initially indicated you were using 5902, so I assume you haven't run the fixer on this image. > can you recommend one that should work? for some reason I'm unable to > boot the ones I tried in legacy. I want to make sure it isn't a weird > bios func? Sorry, I don't know of any cache of IGD ROMs. Thanks, Alex _______________________________________________ vfio-users mailing list vfio-users@redhat.com https://www.redhat.com/mailman/listinfo/vfio-users
