[Bug 99025] [KVM][GVT-d] [BDW & SKL ]Ubuntu 16.04 guest boot up with kernel panic with the newest 4.9.0-rc4+ drm-intel kernel

[bugzilla-daemon at freedesktop.org]

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

--- Comment #2 from Terrence Xu <terrence.xu at intel.com> ---
Use the newest drm-intel-testing tag (drm-intel-testing-2016-12-26), this issue
still exist.

Ubuntu guest dmesg as below:
[    0.519993] kvm: no hardware support^M
[    1.696007] [drm:intel_sbi_read] *ERROR* timeout waiting for SBI to complete
read transaction^M
[    1.799010] [drm:intel_sbi_write] *ERROR* timeout waiting for SBI to
complete write transaction^M
[    6.903747] BUG: unable to handle kernel NULL pointer dereference at
0000000000000070^M
[    6.904648] IP: reset_common_ring+0xc3/0x130^M
[    6.905065] PGD 366dc067 ^M
[    6.905065] PUD 365c8067 ^M
[    6.905339] PMD 0 ^M
[    6.905643] ^M
[    6.905998] Oops: 0000 [#1] PREEMPT SMP^M
[    6.906378] Modules linked in: e1000^M
[    6.906821] CPU: 0 PID: 21 Comm: kworker/0:1 Not tainted 4.9.0+ #7^M
[    6.907426] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.9.3-0-ge2fc41e-prebuilt.qemu-project.org 04/01/2014^M
[    6.908686] Workqueue: events_long i915_hangcheck_elapsed^M
[    6.909217] task: ffff88007d279b80 task.stack: ffffc900000a8000^M
[    6.909841] RIP: 0010:reset_common_ring+0xc3/0x130^M
[    6.910317] RSP: 0018:ffffc900000abb88 EFLAGS: 00010286^M
[    6.910866] RAX: 0000000080000000 RBX: ffff880036e56000 RCX:
0000000000002030^M
[    6.911563] RDX: 00000000ffffffff RSI: ffffffff81549593 RDI:
0000000000000000^M
[    6.912305] RBP: ffffc900000abba8 R08: ffffffff81ad8b20 R09:
ffffffff81cbbd7c^M
[    6.913037] R10: 0000000000000000 R11: 0000000000000040 R12:
ffff88007c444000^M
[    6.913771] R13: ffff88007d312600 R14: ffff880079bb0000 R15:
ffff880036e56000^M
[    6.914466] FS:  0000000000000000(0000) GS:ffff88007fc00000(0000)
knlGS:0000000000000000^M
[    6.915298] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033^M
[    6.915927] CR2: 0000000000000070 CR3: 0000000036234000 CR4:
00000000003406f0^M
[    6.920229] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000^M
[    6.920989] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400^M
[    6.921716] Call Trace:^M
[    6.921968]  i915_gem_reset+0x248/0x3c0^M
[    6.922360]  ? _raw_spin_unlock_irqrestore+0xe/0x10^M
[    6.922860]  ? __irq_put_desc_unlock+0x1e/0x40^M
[    6.923308]  i915_reset+0xdd/0x160^M
[    6.923666]  i915_reset_and_wakeup+0xe9/0x150^M
[    6.924098]  i915_handle_error+0x1a0/0x210^M
[    6.924512]  ? scnprintf+0x3d/0x70^M
[    6.924872]  hangcheck_declare_hang+0xcb/0xf0^M
[    6.925315]  ? intel_engine_get_active_head+0xb4/0xe0^M
[    6.925853]  i915_hangcheck_elapsed+0x27f/0x2b0^M
[    6.926326]  process_one_work+0x13d/0x4a0^M
[    6.926773]  worker_thread+0x48/0x4e0^M
[    6.927141]  ? _raw_write_unlock_irqrestore+0x2e/0x60^M
[    6.927632]  ? preempt_count_sub+0x4c/0x80^M
[    6.928084]  kthread+0x101/0x140^M
[    6.928416]  ? process_one_work+0x4a0/0x4a0^M
[    6.928877]  ? kthread_create_on_node+0x40/0x40^M
[    6.929327]  ret_from_fork+0x2a/0x40^M
[    6.929675] Code: 41 5e 5d c3 41 8b 44 24 20 4c 89 f7 b9 01 00 00 00 ba 00
00 ff ff 8d b0 a0 03 00 00 41 ff 96 58 07 00 00 49 8b bc 24 80 02 00 00 <48> 8b
47 70 48 39 43 70 74 43 48 85 ff 74 06 3e 83 2f 01 74 50 ^M
[    6.931595] RIP: reset_common_ring+0xc3/0x130 RSP: ffffc900000abb88^M
[    6.932258] CR2: 0000000000000070^M
[    6.932588] ---[ end trace 30ecd9ef57e73e63 ]---^M

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