Re: [Qemu-devel] VFIO VGA test branches

[Maik Broemme <mbroemme@parallels.com>]

Hi,

Maik Broemme <mbroemme@parallels.com> wrote:
> Hi Alex,
> 
> Maik Broemme <mbroemme@parallels.com> wrote:
> > Hi Alex,
> > 
> > Alex Williamson <alex.williamson@redhat.com> wrote:
> > > 
> > > Good to hear.  It looks like you have the same motherboard as my AMD
> > > test system.  An HD7850 in that system runs quite reliably with the
> > > branches above although I do occasionally get VGA palette corruption.
> > > 
> > 
> > Good to know. I'm using a Radeon HD7870 which works fine now. I have the
> > same VGA palette corruption occasionally but only until Catalyst driver
> > is loaded. So it happens sometimes during VGA init if Windows 7 boot
> > logo is shown with very strange colors and went away if Catalyst driver
> > is loaded.
> > 
> > > Are you still require -vga cirrus or do the -vga none, x-vga=on cases
> > > work now too?  Thanks,
> > > 
> > 
> > No longer required, -vga none with x-vga=on work on your branches fine
> > now. Not sure if there was something more changed because with original
> > Fedora 3.9.2 kernel it still doesn't work.
> > 
> 
> Alex, I have a strange issue now with either the 'vfio-vga-reset'
> branches or with the stable 3.9.4 kernel. This is my 'lspci' output:
> 
> 00:14.2 Audio device: Advanced Micro Devices [AMD] nee ATI SBx00 Azalia (Intel HDA) (rev 40)
> 01:00.0 VGA compatible controller: NVIDIA Corporation GF119 [GeForce GT 520] (rev a1)
> 01:00.1 Audio device: NVIDIA Corporation GF119 HDMI Audio Controller (rev a1)
> 02:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Pitcairn [Radeon HD 7800]
> 02:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Cape Verde/Pitcairn HDMI Audio [Radeon HD 7700/7800 Series]
> 
> The '01:00.0' is my primary device used for Linux and '02:00.0' my
> secondary for QEMU. Two new different problems:
> 
> 1) If the 'nvidia.ko' binary driver is loaded for the first card, QEMU
> immediately get stuck after startup and hangs with:
> 
> 1140  futex(0x7f0ad9b21300, FUTEX_WAIT_PRIVATE, 2, NULL
> 
> I have the complete strace output if needed. After that I can only
> terminate qemu with 'kill -9' and if I start it again the following
> Oops occurs:
> 
> [  655.684121] ------------[ cut here ]------------
> [  655.684134] WARNING: at lib/list_debug.c:29 __list_add+0x77/0xd0()
> [  655.684151] Hardware name: GA-990FXA-UD3
> [  655.684271] list_add corruption. next->prev should be prev (ffffffff81ca3d98), but was           (null). (next=ffff88041bc3fe08).
> [  655.684477] Modules linked in: vhost_net macvtap macvlan tun arc4 md4 nls_utf8 cifs dns_resolver fscache vfio_pci vfio_iommu_type1 vfio bridge stp llc ip6table_filter ip6_tables it87 hwmon_vid snd_hda_codec_hdmi nvidia(POF) acpi_cpufreq mperf kvm_amd snd_hda_codec_realtek kvm crc32_pclmul crc32c_intel ghash_clmulni_intel snd_hda_intel snd_hda_codec microcode edac_core snd_hwdep fam15h_power snd_seq edac_mce_amd snd_seq_device k10temp r8169 sp5100_tco snd_pcm mii i2c_piix4 snd_page_alloc snd_timer i2c_core snd soundcore mxm_wmi firewire_ohci firewire_core crc_itu_t wmi
> [  655.685451] Pid: 2097, comm: qemu-system-x86 Tainted: PF          O 3.9.4-200.fc18.x86_64 #1
> [  655.685642] Call Trace:
> [  655.685738]  [<ffffffff8105f125>] warn_slowpath_common+0x75/0xa0
> [  655.685851]  [<ffffffff8105f206>] warn_slowpath_fmt+0x46/0x50
> [  655.685955]  [<ffffffff81316ef7>] __list_add+0x77/0xd0
> [  655.686058]  [<ffffffff8108392c>] add_wait_queue+0x3c/0x60
> [  655.686162]  [<ffffffff813f241d>] vga_get+0xdd/0x190
> [  655.686266]  [<ffffffff81093e40>] ? try_to_wake_up+0x2d0/0x2d0
> [  655.686373]  [<ffffffffa01ac625>] vfio_pci_vga_rw+0xb5/0x230 [vfio_pci]
> [  655.686481]  [<ffffffffa01aa279>] vfio_pci_rw+0x39/0x80 [vfio_pci]
> [  655.686587]  [<ffffffffa01aa30c>] vfio_pci_read+0x1c/0x20 [vfio_pci]
> [  655.686701]  [<ffffffffa01a40e3>] vfio_device_fops_read+0x23/0x30 [vfio]
> [  655.686814]  [<ffffffff811a01b9>] vfs_read+0xa9/0x180
> [  655.686915]  [<ffffffff811a05ba>] sys_pread64+0x9a/0xb0
> [  655.687018]  [<ffffffff81669f59>] system_call_fastpath+0x16/0x1b
> [  655.687123] ---[ end trace a68eabc3660237b1 ]---
> 
> This is always reproducible. I know it is the binary driver and maybe
> nobody cares but it is widely used. :)

Here is the DEBUG_VFIO output:

vfio: vfio_initfn(0000:04:00.0) group 14
vfio: region_add 0 - afffffff [0x7f8698000000]
vfio: SKIPPING region_add fec00000 - fec00fff
vfio: SKIPPING region_add fed00000 - fed003ff
vfio: SKIPPING region_add fee00000 - feefffff
vfio: region_add fffe0000 - ffffffff [0x7f88aa400000]
vfio: region_add 100000000 - 24fffffff [0x7f8748000000]
vfio: Device 0000:04:00.0 flags: 3, regions: 9, irgs: 4
vfio: Device 0000:04:00.0 region 0:
vfio:   size: 0x10000000, offset: 0x0, flags: 0x7
vfio: Device 0000:04:00.0 region 1:
vfio:   size: 0x0, offset: 0x10000000000, flags: 0x0
vfio: Device 0000:04:00.0 region 2:
vfio:   size: 0x40000, offset: 0x20000000000, flags: 0x7
vfio: Device 0000:04:00.0 region 3:
vfio:   size: 0x0, offset: 0x30000000000, flags: 0x0
vfio: Device 0000:04:00.0 region 4:
vfio:   size: 0x100, offset: 0x40000000000, flags: 0x3
vfio: Device 0000:04:00.0 region 5:
vfio:   size: 0x0, offset: 0x50000000000, flags: 0x0
vfio: Device 0000:04:00.0 ROM:
vfio:   size: 0x20000, offset: 0x60000000000, flags: 0x1
vfio: Device 0000:04:00.0 config:
vfio:   size: 0x1000, offset: 0x70000000000, flags: 0x3
vfio: vfio_load_rom(0000:04:00.0)
vfio: Enabled ATI/AMD BAR2 0x4000 quirk for device 0000:04:00.0
vfio: Enabled ATI/AMD BAR4 window quirk for device 0000:04:00.0
vfio: Enabled ATI/AMD quirk 0x3c3 BAR4 for device 0000:04:00.0
vfio: 0000:04:00.0 PCI MSI CAP @0xa0
vfio: vfio_pci_read_config(0000:04:00.0, @0x3d, len=0x1) 1
vfio: vfio_pci_read_config(0000:04:00.0, @0x3d, len=0x1) 1
vfio: vfio_enable_intx_kvm(0000:04:00.0) KVM INTx accel enabled
vfio: vfio_enable_intx(0000:04:00.0)
vfio: vfio_initfn(0000:04:00.1) group 14
vfio: Device 0000:04:00.1 flags: 3, regions: 9, irgs: 4
vfio: Device 0000:04:00.1 region 0:
vfio:   size: 0x4000, offset: 0x0, flags: 0x7
vfio: Device 0000:04:00.1 region 1:
vfio:   size: 0x0, offset: 0x10000000000, flags: 0x0
vfio: Device 0000:04:00.1 region 2:
vfio:   size: 0x0, offset: 0x20000000000, flags: 0x0
vfio: Device 0000:04:00.1 region 3:
vfio:   size: 0x0, offset: 0x30000000000, flags: 0x0
vfio: Device 0000:04:00.1 region 4:
vfio:   size: 0x0, offset: 0x40000000000, flags: 0x0
vfio: Device 0000:04:00.1 region 5:
vfio:   size: 0x0, offset: 0x50000000000, flags: 0x0
vfio: Device 0000:04:00.1 ROM:
vfio:   size: 0x0, offset: 0x60000000000, flags: 0x0
vfio: Device 0000:04:00.1 config:
vfio:   size: 0x1000, offset: 0x70000000000, flags: 0x3
vfio: 0000:04:00.1 PCI MSI CAP @0xa0
vfio: vfio_pci_read_config(0000:04:00.1, @0x3d, len=0x1) 2
vfio: vfio_pci_read_config(0000:04:00.1, @0x3d, len=0x1) 2
vfio: vfio_enable_intx_kvm(0000:04:00.1) KVM INTx accel enabled
vfio: vfio_enable_intx(0000:04:00.1)
vfio: region_del 0 - afffffff
vfio: region_add 0 - bffff [0x7f8698000000]
vfio: region_add c0000 - dffff [0x7f88aa200000]
vfio: region_add e0000 - fffff [0x7f88aa400000]
vfio: region_add 100000 - afffffff [0x7f8698100000]
vfio: vfio_pci_reset(0000:04:00.0)
vfio: vfio_disable_intx_kvm(0000:04:00.0) KVM INTx accel disabled
vfio: vfio_disable_intx(0000:04:00.0)
vfio: vfio_pci_read_config(0000:04:00.0, @0x54, len=0x2) 0
vfio: vfio_pci_read_config(0000:04:00.0, @0x4, len=0x2) 3
vfio: vfio_pci_write_config(0000:04:00.0, @0x4, 0x0, len=0x2)
vfio: vfio_pci_read_config(0000:04:00.0, @0x3d, len=0x1) 1
vfio: vfio_enable_intx_kvm(0000:04:00.0) KVM INTx accel enabled
vfio: vfio_enable_intx(0000:04:00.0)
vfio: vfio_pci_reset(0000:04:00.1)
vfio: vfio_disable_intx_kvm(0000:04:00.1) KVM INTx accel disabled
vfio: vfio_disable_intx(0000:04:00.1)
vfio: vfio_pci_read_config(0000:04:00.1, @0x54, len=0x2) 0
vfio: vfio_pci_read_config(0000:04:00.1, @0x4, len=0x2) 6
vfio: vfio_pci_write_config(0000:04:00.1, @0x4, 0x0, len=0x2)
vfio: vfio_pci_read_config(0000:04:00.1, @0x3d, len=0x1) 2
vfio: vfio_enable_intx_kvm(0000:04:00.1) KVM INTx accel enabled
vfio: vfio_enable_intx(0000:04:00.1)
vfio: region_del 0 - bffff
vfio: region_del c0000 - dffff
vfio: region_add 0 - c7fff [0x7f8698000000]
vfio: region_add c8000 - dffff [0x7f88aa208000]
vfio: region_del 0 - c7fff
vfio: region_del c8000 - dffff
vfio: region_add 0 - cffff [0x7f8698000000]
vfio: region_add d0000 - dffff [0x7f88aa210000]
vfio: region_del 0 - cffff
vfio: region_del d0000 - dffff
vfio: region_add 0 - d7fff [0x7f8698000000]
vfio: region_add d8000 - dffff [0x7f88aa218000]
vfio: region_del 0 - d7fff
vfio: region_del d8000 - dffff
vfio: region_add 0 - dffff [0x7f8698000000]
vfio: region_del 0 - dffff
vfio: region_del e0000 - fffff
vfio: region_add 0 - e7fff [0x7f8698000000]
vfio: region_add e8000 - fffff [0x7f88aa408000]
vfio: region_del 0 - e7fff
vfio: region_del e8000 - fffff
vfio: region_add 0 - effff [0x7f8698000000]
vfio: region_add f0000 - fffff [0x7f88aa410000]
vfio: region_del 0 - effff
vfio: region_del f0000 - fffff
vfio: region_del 100000 - afffffff
vfio: region_add 0 - afffffff [0x7f8698000000]
vfio: vfio_pci_read_config(0000:04:00.0, @0x0, len=0x2) 1002
vfio: vfio_pci_read_config(0000:04:00.0, @0xa, len=0x2) 300
vfio: vfio_pci_read_config(0000:04:00.0, @0xe, len=0x1) 80
vfio: vfio_pci_read_config(0000:04:00.1, @0x0, len=0x2) 1002
vfio: vfio_pci_read_config(0000:04:00.1, @0xa, len=0x2) 403
vfio: vfio_pci_read_config(0000:04:00.0, @0x0, len=0x2) 1002
vfio: vfio_pci_read_config(0000:04:00.0, @0xa, len=0x2) 300
vfio: vfio_pci_read_config(0000:04:00.0, @0xe, len=0x1) 80
vfio: vfio_pci_read_config(0000:04:00.1, @0x0, len=0x2) 1002
vfio: vfio_pci_read_config(0000:04:00.1, @0xa, len=0x2) 403
vfio: vfio_pci_read_config(0000:04:00.0, @0x0, len=0x2) 1002
vfio: vfio_pci_read_config(0000:04:00.0, @0x0, len=0x4) 68181002
vfio: vfio_pci_read_config(0000:04:00.0, @0x8, len=0x4) 3000000
vfio: vfio_pci_read_config(0000:04:00.0, @0xe, len=0x1) 80
vfio: vfio_pci_read_config(0000:04:00.0, @0xe, len=0x1) 80
vfio: vfio_pci_read_config(0000:04:00.1, @0x0, len=0x2) 1002
vfio: vfio_pci_read_config(0000:04:00.1, @0x0, len=0x4) aab01002
vfio: vfio_pci_read_config(0000:04:00.1, @0x8, len=0x4) 4030000
vfio: vfio_pci_read_config(0000:04:00.1, @0xe, len=0x1) 80
vfio: SKIPPING region_add b0000000 - bfffffff
vfio: vfio_pci_read_config(0000:04:00.0, @0x10, len=0x4) c000000c
vfio: vfio_pci_write_config(0000:04:00.0, @0x10, 0xffffffff, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.0, @0x10, len=0x4) f000000c
vfio: vfio_pci_write_config(0000:04:00.0, @0x10, 0xc000000c, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.0, @0x14, len=0x4) 0
vfio: vfio_pci_write_config(0000:04:00.0, @0x14, 0xffffffff, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.0, @0x14, len=0x4) ffffffff
vfio: vfio_pci_write_config(0000:04:00.0, @0x14, 0x0, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.0, @0x18, len=0x4) fde80004
vfio: vfio_pci_write_config(0000:04:00.0, @0x18, 0xffffffff, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.0, @0x18, len=0x4) fffc0004
vfio: vfio_pci_write_config(0000:04:00.0, @0x18, 0xfde80004, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.0, @0x1c, len=0x4) 0
vfio: vfio_pci_write_config(0000:04:00.0, @0x1c, 0xffffffff, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.0, @0x1c, len=0x4) ffffffff
vfio: vfio_pci_write_config(0000:04:00.0, @0x1c, 0x0, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.0, @0x20, len=0x4) ce01
vfio: vfio_pci_write_config(0000:04:00.0, @0x20, 0xffffffff, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.0, @0x20, len=0x4) ffffff01
vfio: vfio_pci_write_config(0000:04:00.0, @0x20, 0xce01, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.0, @0x24, len=0x4) 0
vfio: vfio_pci_write_config(0000:04:00.0, @0x24, 0xffffffff, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.0, @0x24, len=0x4) 0
vfio: vfio_pci_write_config(0000:04:00.0, @0x24, 0x0, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.0, @0x30, len=0x4) 0
vfio: vfio_pci_write_config(0000:04:00.0, @0x30, 0xfffff800, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.0, @0x30, len=0x4) fffe0000
vfio: vfio_pci_write_config(0000:04:00.0, @0x30, 0x0, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.1, @0x10, len=0x4) fdefc004
vfio: vfio_pci_write_config(0000:04:00.1, @0x10, 0xffffffff, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.1, @0x10, len=0x4) ffffc004
vfio: vfio_pci_write_config(0000:04:00.1, @0x10, 0xfdefc004, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.1, @0x14, len=0x4) 0
vfio: vfio_pci_write_config(0000:04:00.1, @0x14, 0xffffffff, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.1, @0x14, len=0x4) ffffffff
vfio: vfio_pci_write_config(0000:04:00.1, @0x14, 0x0, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.1, @0x18, len=0x4) 0
vfio: vfio_pci_write_config(0000:04:00.1, @0x18, 0xffffffff, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.1, @0x18, len=0x4) 0
vfio: vfio_pci_write_config(0000:04:00.1, @0x18, 0x0, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.1, @0x1c, len=0x4) 0
vfio: vfio_pci_write_config(0000:04:00.1, @0x1c, 0xffffffff, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.1, @0x1c, len=0x4) 0
vfio: vfio_pci_write_config(0000:04:00.1, @0x1c, 0x0, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.1, @0x20, len=0x4) 0
vfio: vfio_pci_write_config(0000:04:00.1, @0x20, 0xffffffff, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.1, @0x20, len=0x4) 0
vfio: vfio_pci_write_config(0000:04:00.1, @0x20, 0x0, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.1, @0x24, len=0x4) 0
vfio: vfio_pci_write_config(0000:04:00.1, @0x24, 0xffffffff, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.1, @0x24, len=0x4) 0
vfio: vfio_pci_write_config(0000:04:00.1, @0x24, 0x0, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.1, @0x30, len=0x4) 0
vfio: vfio_pci_write_config(0000:04:00.1, @0x30, 0xfffff800, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.1, @0x30, len=0x4) 0
vfio: vfio_pci_write_config(0000:04:00.1, @0x30, 0x0, len=0x4)
vfio: vfio_pci_write_config(0000:04:00.0, @0x20, 0xc000, len=0x4)
vfio: vfio_pci_write_config(0000:04:00.0, @0x18, 0xfea00000, len=0x4)
vfio: vfio_pci_write_config(0000:04:00.0, @0x1c, 0x0, len=0x4)
vfio: vfio_pci_write_config(0000:04:00.0, @0x30, 0xfea40000, len=0x4)
vfio: vfio_pci_write_config(0000:04:00.1, @0x10, 0xfea60000, len=0x4)
vfio: vfio_pci_write_config(0000:04:00.1, @0x14, 0x0, len=0x4)
vfio: vfio_pci_write_config(0000:04:00.0, @0x10, 0xe0000000, len=0x4)
vfio: vfio_pci_write_config(0000:04:00.0, @0x14, 0x0, len=0x4)
vfio: SKIPPING region_add feb40000 - feb4002f
vfio: SKIPPING region_add feb40800 - feb40807
vfio: SKIPPING region_add feb41000 - feb4101f
vfio: SKIPPING region_add feb41800 - feb41807
vfio: vfio_update_irq(0000:04:00.1) IRQ moved 20 -> 10
vfio: vfio_disable_intx_kvm(0000:04:00.1) KVM INTx accel disabled
vfio: vfio_enable_intx_kvm(0000:04:00.1) KVM INTx accel enabled
vfio: vfio_update_irq(0000:04:00.0) IRQ moved 23 -> 11
vfio: vfio_disable_intx_kvm(0000:04:00.0) KVM INTx accel disabled
vfio: vfio_enable_intx_kvm(0000:04:00.0) KVM INTx accel enabled
vfio: SKIPPING region_add feb42000 - feb42fff
vfio: vfio_pci_read_config(0000:04:00.0, @0x3d, len=0x1) 1
vfio: vfio_pci_write_config(0000:04:00.0, @0x3c, 0xb, len=0x1)
vfio: vfio_pci_read_config(0000:04:00.0, @0x4, len=0x2) 0
vfio: vfio_pci_write_config(0000:04:00.0, @0x4, 0x103, len=0x2)
vfio: region_add e0000000 - efffffff [0x7f8688000000]
vfio: region_add fea00000 - fea03fff [0x7f88aa7b8000]
vfio: SKIPPING region_add fea04000 - fea04fff
vfio: region_add fea05000 - fea3ffff [0x7f88aa7bd000]
vfio: vfio_pci_read_config(0000:04:00.1, @0x3d, len=0x1) 2
vfio: vfio_pci_write_config(0000:04:00.1, @0x3c, 0xa, len=0x1)
vfio: vfio_pci_read_config(0000:04:00.1, @0x4, len=0x2) 0
vfio: vfio_pci_write_config(0000:04:00.1, @0x4, 0x103, len=0x2)
vfio: region_add fea60000 - fea63fff [0x7f88bc710000]
vfio: vfio_pci_read_config(0000:04:00.0, @0x4, len=0x2) 103
vfio: vfio_pci_read_config(0000:04:00.0, @0x4, len=0x2) 103
vfio: vfio_pci_write_config(0000:04:00.0, @0x4, 0x103, len=0x2)
vfio: region_del 0 - afffffff
vfio: region_add 0 - 9ffff [0x7f8698000000]
vfio: SKIPPING region_add a0000 - bffff
vfio: region_add c0000 - afffffff [0x7f86980c0000]
vfio: vfio_pci_read_config(0000:04:00.0, @0x4, len=0x2) 103
vfio: vfio_pci_read_config(0000:04:00.0, @0x30, len=0x4) fea40000
vfio: vfio_pci_write_config(0000:04:00.0, @0x30, 0xfffffffe, len=0x4)
vfio: vfio_pci_read_config(0000:04:00.0, @0x30, len=0x4) fffe0000
vfio: vfio_pci_write_config(0000:04:00.0, @0x30, 0xfea40001, len=0x4)
vfio: region_add fea40000 - fea5ffff [0x7f88a9e00000]
vfio: vfio_pci_write_config(0000:04:00.0, @0x30, 0xfea40000, len=0x4)
vfio: region_del fea40000 - fea5ffff

Here is the strace output from this failure:

1110  ioctl(14, KVM_RUN, 0)             = 0
1110  pread(20,  <unfinished ...>
1099  <... poll resumed> )              = 1 ([{fd=0, revents=POLLIN}])
1099  futex(0x7ff73ca62fa0, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
1109  <... futex resumed> )             = -1 ETIMEDOUT (Connection timed out)
1109  madvise(0x7ff72fe17000, 8368128, MADV_DONTNEED) = 0
1109  _exit(0)                          = ?
1109  +++ exited with 0 +++

>From reading the source 'hw/misc/vfio.c' it looks like the following
in 'vfio_vga_read' never finished:

    if (pread(vga->fd, &buf, size, offset) != size) {
        error_report("%s(,0x%"HWADDR_PRIx", %d) failed: %m",
                     __func__, region->offset + addr, size);
        return (uint64_t)-1;
    }

> 
> 2) If the 'nouveau.ko' driver is loaded it is even more strange. As soon
> as I start qemu all my SATA links get a hard reset and kernel freezes.
> No SysRQs are working anymore and only reboot helps. If needed I can
> look if I can get some dumps from this freeze because it writes nothing
> more to the disks.
> 
> But it is getting even more strange. I was putting the secondary card
> in another PCI slot and then it started to work with nouveau module
> loaded and passthrough ATI card to QEMU. But this worked only until I
> started X server with nouveau X driver. As soon as X is running and I
> started QEMU it hanged again in FUTEX_WAIT_PRIVATE.
> 
> 3) Without loading 'nvidia.ko' or 'nouveau.ko' modules it works out of
> the box with several start/stop cycles. However I have no X in this
> case. ;)
> 
> Any ideas? :)
> 
> > > Alex
> > > 
> > 
> > --Maik
> > 
> 
> --Maik
> 

--Maik