First, thank you for your blog posts and your work on vfio and in this area.
On Wed, Jul 27, 2016, at 05:20 PM, Alex Williamson wrote: > On Wed, 27 Jul 2016 17:01:21 -0700 > globalgorri...@fastmail.fm wrote: > > > Hello, > > > > Do you reckon this is what some bugzilla's find to be a motherboard > > memory mapping issue or a chipset issue? > > > > Any ideas on working around it besides opting the IGD out of MMIO? > > > > Doing that prevents it from being used with vfio-pci and qemu. > > > > --- > > > > i7-4790k, ASUS Z97-WS (BIOS 2403), kernel 4.7, qemu v2.7.0-rc0 > > > > % lspci -vvn -s 00:02 > > 00:02.0 0300: 8086:0412 (rev 06) (prog-if 00 [VGA controller]) > > Subsystem: 1043:8534 > > Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- > > ParErr- Stepping- SERR- FastB2B- DisINTx- > > Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- > > <TAbort- <MAbort- >SERR- <PERR- INTx- > > Latency: 0 > > Interrupt: pin A routed to IRQ 11 > > Region 0: Memory at df800000 (64-bit, non-prefetchable) > > [size=4M] > > Region 2: Memory at b0000000 (64-bit, prefetchable) [size=256M] > > Region 4: I/O ports at f000 [size=64] > > [virtual] Expansion ROM at 000c0000 [disabled] [size=128K] > > Capabilities: [90] MSI: Enable- Count=1/1 Maskable- 64bit- > > Address: 00000000 Data: 0000 > > Capabilities: [d0] Power Management version 2 > > Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA > > PME(D0-,D1-,D2-,D3hot-,D3cold-) > > Status: D3 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME- > > Capabilities: [a4] PCI Advanced Features > > AFCap: TP+ FLR+ > > AFCtrl: FLR- > > AFStatus: TP- > > Kernel driver in use: vfio-pci > > Kernel modules: i915 > > > > % cat /proc/cmdline > > ... intel_iommu=on iommu=pt default_hugepagesz=1G hugepagesz=1G > > hugepages=16 kvm.ignore_msrs=1 intremap=no_x2apic_optout console=ttyS0 > > video=vesafb:off,efifb:off ... > > > > % cat /etc/modprobe.d/blacklist.conf > > blacklist efifb > > install efifb /bin/false > > > > % cat /etc/modprobe.d/vfio.conf > > options vfio-pci ids=8086:0412 > > --- > > > > First I re-built the kernel with efifb as a module for the modprobe > > blacklist to prevent efifb from binding. Something in systemd-boot? > > Not necessary, the video=efifb:off should take care of it. That's what I thought as well. Perhaps I missed something but after I built it as a module it no longer binds. > > > Now enabling CSM in the BIOS has made the Video ROM available (whilst > > still booting with UEFI) but qemu still can't enable VGA access and > > legacy pass-through mode is disabled. > > > > --- > > > > % grep Video /proc/iomem > > 00000000-00000000 : Video ROM > > Recent kernels won't show /proc/iomem or /proc/ioport to regular users > as a security measure. You need sudo to see anything. Noted. Should I be looking for anything else here? I am able to see that Video ROM line now after enabling CSM. > > > % /usr/bin/qemu-system-x86_64 -name guest=win10_1 -S \ > > -machine pc-i440fx-2.6,accel=kvm,usb=off \ > > -cpu host -m 8192 \ > > -mem-prealloc -mem-path /dev/hugepages/libvirt/qemu \ > > -smp 6,sockets=1,cores=3,threads=2 \ > > -nographic -no-user-config -nodefaults \ > > -device vfio-pci,host=00:02.0,id=hostdev0,bus=pci.0,addr=0x2 \ > > -msg timestamp=on \ > > -bios /usr/share/qemu/bios.bin > > > > ... > > [ 45.426546] DMAR: DRHD: handling fault status reg 3 > > [ 45.484901] DMAR: [DMA Read] Request device [00:02.0] fault addr > > 8f2c0000 [fault reason 06] PTE Read access is not set > > [ 45.612929] DMAR: DRHD: handling fault status reg 2 > > [ 45.671267] DMAR: [DMA Read] Request device [00:02.0] fault addr > > 8f314000 [fault reason 06] PTE Read access is not set > > [ 45.799288] DMAR: DRHD: handling fault status reg 2 > > [ 45.857634] DMAR: [DMA Read] Request device [00:02.0] fault addr > > 8f3a7000 [fault reason 06] PTE Read access is not set > > > > qemu.log: > > qemu-system-x86_64: -device > > vfio-pci,host=00:02.0,id=hostdev0,bus=pci.0,addr=0x2: IGD device > > 0000:00:02.0 failed to enable VGA access, legacy mode disabled > > Is you kernel built with CONFIG_VFIO_PCI_VGA=y? Yes. % zcat /proc/config.gz | grep CONFIG_VFIO_PCI_VGA CONFIG_VFIO_PCI_VGA=y _______________________________________________ vfio-users mailing list vfio-users@redhat.com https://www.redhat.com/mailman/listinfo/vfio-users
