[Bug 99025] [KVM][GVT-d] [BDW & SKL ]Ubuntu 16.04 guest boot up with kernel panic with the newest 4.9.0+ drm-intel kernel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99025

--- Comment #6 from Terrence Xu <terrence.xu at intel.com> ---
I still can reproduce this issue with using the newest drm-tip code as Ubuntu
guest kernel.

Host 
repo: kvm.git
commit: 0c744ea Linux 4.10-rc2

Guest
repo: drm-intel.git
commit: 0f01216 drm-tip: 2017y-02m-02d-19h-49m-15s UTC integration manifest


[    0.516920] kvm: no hardware support^M
[    1.692850] [drm:intel_sbi_read] *ERROR* timeout waiting for SBI to complete
read transaction^M
[    1.795851] [drm:intel_sbi_write] *ERROR* timeout waiting for SBI to
complete write transaction^M
[    6.900039] BUG: unable to handle kernel NULL pointer dereference at
0000000000000070^M
[    6.900956] IP: reset_common_ring+0x9a/0x100^M
[    6.901386] PGD 36248067 ^M
[    6.901386] PUD 36247067 ^M
[    6.901680] PMD 0 ^M
[    6.902128] ^M
[    6.902539] Oops: 0000 [#1] PREEMPT SMP^M
[    6.902957] Modules linked in: e1000^M
[    6.903326] CPU: 0 PID: 21 Comm: kworker/0:1 Not tainted 4.10.0-rc6+ #8^M
[    6.904035] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.9.3-0-ge2fc41e-prebuilt.qemu-project.org 04/01/2014^M
[    6.905240] Workqueue: events_long i915_hangcheck_elapsed^M
[    6.905830] task: ffff88007d279b80 task.stack: ffffc900000a8000^M
[    6.906425] RIP: 0010:reset_common_ring+0x9a/0x100^M
[    6.906950] RSP: 0018:ffffc900000abb98 EFLAGS: 00010246^M
[    6.907478] RAX: 0000000000000000 RBX: ffff880036e54000 RCX:
0000000000000008^M
[    6.908225] RDX: 0000000000003fd8 RSI: ffff880079bc8000 RDI:
0000000000000000^M
[    6.908987] RBP: ffffc900000abbb0 R08: 0000000000000001 R09:
ffffc900100010a0^M
[    6.909700] R10: ffff88003670d188 R11: 0000000000000040 R12:
ffff88007d30f600^M
[    6.910451] R13: ffff88007c420000 R14: ffff88007d30f600 R15:
000000000000001a^M
[    6.911199] FS:  0000000000000000(0000) GS:ffff88007fc00000(0000)
knlGS:0000000000000000^M
[    6.912046] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033^M
[    6.912616] CR2: 0000000000000070 CR3: 0000000036249000 CR4:
00000000003406f0^M
[    6.913376] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000^M
[    6.914132] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400^M
[    6.914846] Call Trace:^M
[    6.915135]  i915_gem_reset_finish+0x229/0x3a0^M
[    6.915583]  ? intel_uncore_forcewake_put+0x48/0x60^M
[    6.916112]  i915_reset+0xd5/0x160^M
[    6.916453]  i915_reset_and_wakeup+0xe9/0x150^M
[    6.916901]  i915_handle_error+0x1a0/0x210^M
[    6.917345]  ? scnprintf+0x3d/0x70^M
[    6.917684]  hangcheck_declare_hang+0xcb/0xf0^M
[    6.918173]  ? intel_engine_get_active_head+0xb4/0xe0^M
[    6.918668]  i915_hangcheck_elapsed+0x27f/0x2b0^M
[    6.919172]  process_one_work+0x13d/0x4a0^M
[    6.919576]  worker_thread+0x48/0x4e0^M
[    6.919961]  ? _raw_write_unlock_irqrestore+0x2e/0x60^M
[    6.920506]  ? preempt_count_sub+0x4c/0x80^M
[    6.920920]  kthread+0x101/0x140^M
[    6.921288]  ? process_one_work+0x4a0/0x4a0^M
[    6.921705]  ? kthread_create_on_node+0x40/0x40^M
[    6.922209]  ret_from_fork+0x31/0x40^M
[    6.922570] Code: 48 8b 83 80 00 00 00 c7 40 3c ff ff ff ff 48 8b bb 80 00
00 00 e8 97 3b 00 00 8b 05 75 b6 9f 00 85 c0 75 5d 49 8b bd 88 02 00 00 <48> 8b
47 70 48 39 43 70 74 3d 48 85 ff 74 06 3e 83 2f 01 74 48 ^M
[    6.924526] RIP: reset_common_ring+0x9a/0x100 RSP: ffffc900000abb98^M
[    6.925153] CR2: 0000000000000070^M
[    6.925526] ---[ end trace 9c68741eebecd572 ]---^M

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