Setup help

Fri Mar 17 13:05:16 UTC 2017

Hi,

I am trying to settup a QEMU VM following the most up to date documentation
I could find: https://github.com/01org/gvt-linux/wiki/GVTg_Setup_Guide I
have a t460p, skylake hd530, and I am using f25 as host and guest with
modified kernel and xorg drivers for gvt testing.

- Whether I use intel or modesetting driver, 4.10 (from
gvt/gvt-stable-4.10) or 4.11 (from gvt-testing), I have the following
kernel oops:

Mar 17 16:49:22 localhost.localdomain /usr/libexec/gdm-x-session[836]: (II)
modeset(0): Allocate new frame buffer 2944x1200 stride
Mar 17 16:49:22 localhost.localdomain kernel: [drm:intel_pipe_update_end
[i915]] *ERROR* Atomic update failure on pipe A (start=2600 end=2601) time
141 us, min 1192, max 1199, scanline start 203, end 203
Mar 17 16:49:22 localhost.localdomain kernel: BUG: unable to handle kernel
NULL pointer dereference at           (null)
Mar 17 16:49:22 localhost.localdomain kernel: IP: check_addr+0x35/0x60
Mar 17 16:49:22 localhost.localdomain kernel: PGD 755f9067
Mar 17 16:49:22 localhost.localdomain kernel: PUD 755fa067
Mar 17 16:49:22 localhost.localdomain kernel: PMD 0
Mar 17 16:49:22 localhost.localdomain kernel:
Mar 17 16:49:22 localhost.localdomain kernel: Oops: 0000 [#1] SMP
Mar 17 16:49:22 localhost.localdomain kernel: Modules linked in:
nf_conntrack_netbios_ns nf_conntrack_broadcast ip6t_REJECT nf_reject_ipv6
ip6t_rpfilter xt_conntrack ip_set nfnetlink ebtable_nat ebtable_broute b
Mar 17 16:49:22 localhost.localdomain kernel:  floppy virtio
Mar 17 16:49:22 localhost.localdomain kernel: CPU: 1 PID: 857 Comm: Xorg
Not tainted 4.10.0+ #5
Mar 17 16:49:22 localhost.localdomain kernel: Hardware name: QEMU Standard
PC (i440FX + PIIX, 1996), BIOS rel-1.10.0-4-g8e8c124 04/01/2014
Mar 17 16:49:22 localhost.localdomain kernel: task: ffff8b4ab71ada00
task.stack: ffff9bf244434000
Mar 17 16:49:22 localhost.localdomain kernel: RIP: 0010:check_addr+0x35/0x60
Mar 17 16:49:22 localhost.localdomain kernel: RSP: 0018:ffff9bf244437c48
EFLAGS: 00010246
Mar 17 16:49:22 localhost.localdomain kernel: RAX: 0000000000000000 RBX:
0000000000000000 RCX: 000000000005e000
Mar 17 16:49:22 localhost.localdomain kernel: RDX: 0000000076cee000 RSI:
ffff8b4a7452f810 RDI: ffffffffa4c35d4a
Mar 17 16:49:22 localhost.localdomain kernel: RBP: ffff9bf244437c78 R08:
0000000000000000 R09: ffff8b4ab42c9680
Mar 17 16:49:22 localhost.localdomain kernel: R10: 0000000000000000 R11:
0000000000000001 R12: 0000000000000002
Mar 17 16:49:22 localhost.localdomain kernel: R13: ffff8b4a7452f810 R14:
ffffffffa4c35d4a R15: ffff8b4ab42c9680
Mar 17 16:49:22 localhost.localdomain kernel: FS:  00007fa31ef8eec0(0000)
GS:ffff8b4abfd00000(0000) knlGS:0000000000000000
Mar 17 16:49:22 localhost.localdomain kernel: CS:  0010 DS: 0000 ES: 0000
CR0: 0000000080050033
Mar 17 16:49:22 localhost.localdomain kernel: CR2: 0000000000000000 CR3:
00000000755c7000 CR4: 00000000003406e0
Mar 17 16:49:22 localhost.localdomain kernel: DR0: 0000000000000000 DR1:
0000000000000000 DR2: 0000000000000000
Mar 17 16:49:22 localhost.localdomain kernel: DR3: 0000000000000000 DR6:
00000000fffe0ff0 DR7: 0000000000000400
Mar 17 16:49:22 localhost.localdomain kernel: Call Trace:
Mar 17 16:49:22 localhost.localdomain kernel:  ? nommu_map_sg+0x66/0xc0
Mar 17 16:49:22 localhost.localdomain kernel:
i915_gem_map_dma_buf+0x170/0x210 [i915]
Mar 17 16:49:22 localhost.localdomain kernel:
dma_buf_map_attachment+0x31/0x70
Mar 17 16:49:22 localhost.localdomain kernel:
drm_gem_prime_import+0x64/0x130 [drm]
Mar 17 16:49:22 localhost.localdomain kernel:
drm_gem_prime_fd_to_handle+0xbd/0x190 [drm]
Mar 17 16:49:22 localhost.localdomain kernel:
drm_prime_fd_to_handle_ioctl+0x2d/0x40 [drm]
Mar 17 16:49:22 localhost.localdomain kernel:  drm_ioctl+0x21b/0x4c0 [drm]
Mar 17 16:49:22 localhost.localdomain kernel:  ?
fault_dirty_shared_page.isra.52+0x97/0xc0
Mar 17 16:49:22 localhost.localdomain kernel:  ?
drm_prime_handle_to_fd_ioctl+0x60/0x60 [drm]
Mar 17 16:49:22 localhost.localdomain kernel:  do_vfs_ioctl+0xa3/0x5f0
Mar 17 16:49:22 localhost.localdomain kernel:  ? __do_page_fault+0x20b/0x4e0
Mar 17 16:49:22 localhost.localdomain kernel:  SyS_ioctl+0x79/0x90
Mar 17 16:49:22 localhost.localdomain kernel:
entry_SYSCALL_64_fastpath+0x1a/0xa9
Mar 17 16:49:22 localhost.localdomain kernel: RIP: 0033:0x7fa31c82f777
Mar 17 16:49:22 localhost.localdomain kernel: RSP: 002b:00007ffe1fcb2658
EFLAGS: 00000246 ORIG_RAX: 0000000000000010
Mar 17 16:49:22 localhost.localdomain kernel: RAX: ffffffffffffffda RBX:
00007fa31eedb038 RCX: 00007fa31c82f777
Mar 17 16:49:22 localhost.localdomain kernel: RDX: 00007ffe1fcb2690 RSI:
00000000c00c642e RDI: 000000000000000c
Mar 17 16:49:22 localhost.localdomain kernel: RBP: 00007fa31ef00ee8 R08:
0000000000300000 R09: 0000000000001000
Mar 17 16:49:22 localhost.localdomain kernel: R10: 00000000000000b2 R11:
0000000000000246 R12: 00007fa3173fa6e0
Mar 17 16:49:22 localhost.localdomain kernel: R13: 0000000008554000 R14:
0000000005800000 R15: 00007fa31ef015f0
Mar 17 16:49:22 localhost.localdomain kernel: Code: 48 8b 86 18 02 00 00 48
85 c0 74 1f 4c 8b 00 48 8d 74 0a ff b8 01 00 00 00 4c 39 c6 76 33 b8 fe ff
ff ff 49 39 c0 77 13 31 c0 c3 <4c> 8b 04 25 00 00 00 00 eb e
Mar 17 16:49:22 localhost.localdomain kernel: RIP: check_addr+0x35/0x60
RSP: ffff9bf244437c48
Mar 17 16:49:22 localhost.localdomain kernel: CR2: 0000000000000000
Mar 17 16:49:22 localhost.localdomain kernel: ---[ end trace
8c9ac79b5bea216e ]---

Unfortunately, I didn't manage to tell xorg to use a lower resolution,
PreferredMode option seems to be ignored.

- Also, qemu and kernel complains about invalid device ROM. Is there any
rom argument to give to vfio-pci ?

- Finally, I'd like to know the status of vfio_device_get_dmabuf_fd kernel
patch series, for qemu display. Is there an up to date git branch with this
change?

Thanks
-- 
Marc-André Lureau
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