[Bug 1897481] Re: qemu crashes with VGA pass-through, e-GPU, nvidia 1060

[Alex Williamson]

There are definitely resource allocation issues on the host in the
crashing case.  The quirks currently enumerate the device BARs without
testing them, we identify a device and know what the resources should
be, which is why I think QEMU crashes.  Are you able to test if the
patch below is sufficient to resolve the crash?  I'd expect the GPU not
to work in the guest as it doesn't have enough resources, but the goal
would be to resolve the crash; QEMU cannot fix the device mappings on
the host.

diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 0d83eb0e47bb..10477af9fc14 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -2921,7 +2921,9 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
     }
 
     for (i = 0; i < PCI_ROM_SLOT; i++) {
-        vfio_bar_quirk_setup(vdev, i);
+        if (vdev->bars[i].size) {
+            vfio_bar_quirk_setup(vdev, i);
+        }
     }
 
     if (!vdev->igd_opregion &&

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https://bugs.launchpad.net/bugs/1897481

Title:
  qemu crashes with VGA pass-through, e-GPU, nvidia 1060

Status in QEMU:
  New

Bug description:
  I try to pass-through nvidia 1060 6gb card, which is connected via
  ExpressCard (EXP-GDC converter).

  I can successfully run my virtual machine without pass-through, but
  when I try to add the devices, qemu crashes.

  The coredump contains:

  Stack trace of thread 3289311:
  #0  0x0000000000614c49 memory_region_update_container_subregions 
(qemu-system-x86_64 + 0x214c49)
  #1  0x00000000005c0e8c vfio_probe_nvidia_bar0_quirk (qemu-system-x86_64 + 
0x1c0e8c)
  #2  0x00000000005bcec0 vfio_realize (qemu-system-x86_64 + 0x1bcec0)
  #3  0x000000000079b423 pci_qdev_realize (qemu-system-x86_64 + 0x39b423)
  #4  0x00000000006facda device_set_realized (qemu-system-x86_64 + 0x2facda)
  #5  0x0000000000887e57 property_set_bool (qemu-system-x86_64 + 0x487e57)
  #6  0x000000000088ac48 object_property_set (qemu-system-x86_64 + 0x48ac48)
  #7  0x000000000088d1d2 object_property_set_qobject (qemu-system-x86_64 + 
0x48d1d2)
  #8  0x000000000088b1f7 object_property_set_bool (qemu-system-x86_64 + 
0x48b1f7)
  #9  0x0000000000693785 qdev_device_add (qemu-system-x86_64 + 0x293785)
  #10 0x000000000061aad0 device_init_func (qemu-system-x86_64 + 0x21aad0)
  #11 0x000000000098c87b qemu_opts_foreach (qemu-system-x86_64 + 0x58c87b)
  #12 0x00000000006211cb qemu_init (qemu-system-x86_64 + 0x2211cb)
  #13 0x00000000005002aa main (qemu-system-x86_64 + 0x1002aa)
  #14 0x00007fce8af21152 __libc_start_main (libc.so.6 + 0x28152)
  #15 0x000000000050087e _start (qemu-system-x86_64 + 0x10087e)

  The whole running command is pretty long, since I use libvirt to
  manage my machines:

  LC_ALL=C \
  PATH=/usr/local/sbin:/usr/local/bin:/usr/bin \
  HOME=/var/lib/libvirt/qemu/domain-2-Win10 \
  XDG_DATA_HOME=/var/lib/libvirt/qemu/domain-2-Win10/.local/share \
  XDG_CACHE_HOME=/var/lib/libvirt/qemu/domain-2-Win10/.cache \
  XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain-2-Win10/.config \
  QEMU_AUDIO_DRV=spice \
  /usr/bin/qemu-system-x86_64 \
  -name guest=Win10,debug-threads=on \
  -S \
  -blockdev 
'{"driver":"file","filename":"/usr/share/edk2-ovmf/x64/OVMF_CODE.fd","node-name":"libvirt-pflash0-storage","auto-read-only":true,"discard":"unmap"}'
 \
  -blockdev 
'{"node-name":"libvirt-pflash0-format","read-only":true,"driver":"raw","file":"libvirt-pflash0-storage"}'
 \
  -blockdev 
'{"driver":"file","filename":"/var/lib/libvirt/qemu/nvram/Win10_VARS.fd","node-name":"libvirt-pflash1-storage","auto-read-only":true,"discard":"unmap"}'
 \
  -blockdev 
'{"node-name":"libvirt-pflash1-format","read-only":false,"driver":"raw","file":"libvirt-pflash1-storage"}'
 \
  -machine 
pc-q35-5.1,accel=kvm,usb=off,vmport=off,dump-guest-core=off,pflash0=libvirt-pflash0-format,pflash1=libvirt-pflash1-format
 \
  -cpu host,migratable=on,hv-time,hv-relaxed,hv-vapic,hv-spinlocks=0x1fff \
  -m 8192 \
  -overcommit mem-lock=off \
  -smp 2,sockets=2,cores=1,threads=1 \
  -uuid 7043c77b-4903-4527-8089-9679d9a17fee \
  -no-user-config \
  -nodefaults \
  -chardev stdio,mux=on,id=charmonitor \
  -mon chardev=charmonitor,id=monitor,mode=control \
  -rtc base=localtime,driftfix=slew \
  -global kvm-pit.lost_tick_policy=delay \
  -no-hpet \
  -no-shutdown \
  -global ICH9-LPC.disable_s3=1 \
  -global ICH9-LPC.disable_s4=1 \
  -boot strict=on \
  -device 
pcie-root-port,port=0x10,chassis=1,id=pci.1,bus=pcie.0,multifunction=on,addr=0x2
 \
  -device pcie-root-port,port=0x11,chassis=2,id=pci.2,bus=pcie.0,addr=0x2.0x1 \
  -device pcie-root-port,port=0x12,chassis=3,id=pci.3,bus=pcie.0,addr=0x2.0x2 \
  -device pcie-root-port,port=0x13,chassis=4,id=pci.4,bus=pcie.0,addr=0x2.0x3 \
  -device pcie-root-port,port=0x14,chassis=5,id=pci.5,bus=pcie.0,addr=0x2.0x4 \
  -device pcie-root-port,port=0x15,chassis=6,id=pci.6,bus=pcie.0,addr=0x2.0x5 \
  -device qemu-xhci,p2=15,p3=15,id=usb,bus=pci.2,addr=0x0 \
  -device virtio-serial-pci,id=virtio-serial0,bus=pci.3,addr=0x0 \
  -blockdev '{"driver":"file","filename":"/home/sergiy/VirtualBox 
VMs/win4games.img","node-name":"libvirt-2-storage","auto-read-only":true,"discard":"unmap"}'
 \
  -blockdev 
'{"node-name":"libvirt-2-format","read-only":false,"driver":"raw","file":"libvirt-2-storage"}'
 \
  -device ide-hd,bus=ide.0,drive=libvirt-2-format,id=sata0-0-0,bootindex=1 \
  -blockdev 
'{"driver":"file","filename":"/home/sergiy/Downloads/Win10_2004_Ukrainian_x64.iso","node-name":"libvirt-1-storage","auto-read-only":true,"discard":"unmap"}'
 \
  -blockdev 
'{"node-name":"libvirt-1-format","read-only":true,"driver":"raw","file":"libvirt-1-storage"}'
 \
  -device ide-cd,bus=ide.1,drive=libvirt-1-format,id=sata0-0-1 \
  -chardev pty,id=charserial0 \
  -device isa-serial,chardev=charserial0,id=serial0 \
  -chardev spicevmc,id=charchannel0,name=vdagent \
  -device 
virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.spice.0
 \
  -spice 
port=5900,addr=127.0.0.1,disable-ticketing,image-compression=off,seamless-migration=on
 \
  -device 
qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vram64_size_mb=0,vgamem_mb=16,max_outputs=1,bus=pcie.0,addr=0x1
 \
  -chardev spicevmc,id=charredir0,name=usbredir \
  -device usb-redir,chardev=charredir0,id=redir0,bus=usb.0,port=1 \
  -chardev spicevmc,id=charredir1,name=usbredir \
  -device usb-redir,chardev=charredir1,id=redir1,bus=usb.0,port=2 \
  -device 
vfio-pci,host=0000:04:00.0,id=hostdev0,bus=pci.4,multifunction=on,addr=0x0 \
  -device vfio-pci,host=0000:04:00.1,id=hostdev1,bus=pci.4,addr=0x0.0x1 \
  -device virtio-balloon-pci,id=balloon0,bus=pci.5,addr=0x0 \
  -sandbox 
on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
  -msg timestamp=on

  I've forced vfio_pci module for the VGA, and ensured that lspci shows

    Kernel driver in use: vfio_pci

  My laptop is Thinkpad x230, that runs on Intel(R) Core(TM) i5-3320M CPU @ 
2.60GHz. 
  I run 5.8.6-1-MANJARO kernel and run QEMU emulator version 5.1.0.

  Thank you for your attention. I'd love to provide more information,
  but I don't know what else matters.

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