[Bug 92906] New: [HSW/BDW] i915 driver in kernels prior to 4.2 fail in KVM virtual machines with Intel IGD passthrough

Wed Nov 11 10:31:56 PST 2015

https://bugs.freedesktop.org/show_bug.cgi?id=92906

            Bug ID: 92906
           Summary: [HSW/BDW] i915 driver in kernels prior to 4.2 fail in
                    KVM virtual machines with Intel IGD passthrough
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: david.j.cowperthwaite at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

On 4.2 kernel there's a failure in intel_uncore.c but the kernel load
progresses and the VM boots, DRI / Mesa / MSDK all work.

On kernels prior to this, (4.1 and earlier were tested) the VM stops @ the
point where drm reports that it is "Replacing the VGA console driver" and no
crash is output.

This output is from a HSW Corei7 with Iris Pro graphics (Gigabyte Brix Pro).
The Host OS is Centos7.1 with KVM installed and the patch to reject passthrough
of devices with RMRR tables (https://lkml.org/lkml/2014/7/3/580) reversed.

The Virtual Machine is also Centos7.1, the goal is to have Intel Media SDK
(requires 3.10 kernel + MSDK specific patchset) working in a VM on KVM on HSW &
BDW (later SKL).  Host PCI device 0:2.0 (IGD) is mapped through to the VM.

Call Trace form the 4.2 kernel (which did eventually work)
[    8.361933] [drm] Found 128MB of eLLC
[    8.364588] [drm] Memory usable by graphics device = 2048M
[    8.364675] [drm] Replacing VGA console driver
[    8.369307] systemd[1]: Received SIGCHLD from PID 490 (lvm).
[    8.369703] ------------[ cut here ]------------
[    8.369730] WARNING: CPU: 1 PID: 526 at
drivers/gpu/drm/i915/intel_uncore.c:620
hsw_unclaimed_reg_debug.isra.14+0x78/0xa0 [i915]()
[    8.369731] Unclaimed register detected after writing to register 0x6120c
[    8.369752] Modules linked in: snd_hda_intel(+) snd_hda_codec snd_hda_core
snd_hwdep snd_seq snd_seq_device snd_pcm ppdev joydev snd_timer i915(+) snd
input_leds video serio_raw soundcore i2c_algo_bit pcspkr virtio_balloon
i2c_piix4 parport_pc 8250_fintek parport acpi_cpufreq uinput xfs libcrc32c
virtio_blk sr_mod cdrom virtio_console virtio_net ata_generic pata_acpi qxl
syscopyarea ata_piix sysfillrect sysimgblt drm_kms_helper ttm virtio_pci
virtio_ring virtio drm libata floppy dm_mirror dm_region_hash dm_log dm_mod
[    8.369754] CPU: 1 PID: 526 Comm: systemd-udevd Not tainted
4.2.0-1.el7.elrepo.x86_64 #1
[    8.369755] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011
[    8.369757]  0000000000000000 000000008918e0ce ffff880079543708
ffffffff816aebe9
[    8.369758]  0000000000000000 ffff880079543760 ffff880079543748
ffffffff810798ea
[    8.369760]  00003ffffffff000 ffff88007ac40078 000000000006120c
ffff88007ac40078
[    8.369760] Call Trace:
[    8.369765]  [<ffffffff816aebe9>] dump_stack+0x45/0x57
[    8.369767]  [<ffffffff810798ea>] warn_slowpath_common+0x8a/0xc0
[    8.369768]  [<ffffffff81079975>] warn_slowpath_fmt+0x55/0x70
[    8.369772]  [<ffffffff810c1581>] ?
__raw_callee_save___pv_queued_spin_unlock+0x11/0x20
[    8.369775]  [<ffffffff810662b4>] ? iounmap+0x84/0xb0
[    8.369791]  [<ffffffffa034ecc8>] hsw_unclaimed_reg_debug.isra.14+0x78/0xa0
[i915]
[    8.369804]  [<ffffffffa03504e3>] hsw_write32+0x93/0x130 [i915]
[    8.369819]  [<ffffffffa0359b41>] intel_setup_bios+0x81/0x90 [i915]
[    8.369840]  [<ffffffffa03abd80>] i915_driver_load+0x520/0xed0 [i915]
[    8.369843]  [<ffffffff81568770>] ? trace_open+0x30/0x30
[    8.369846]  [<ffffffff81318880>] ? cleanup_uevent_env+0x10/0x10
[    8.369847]  [<ffffffff81318c0f>] ? kobject_uevent_env+0x15f/0x660
[    8.369851]  [<ffffffff8145385f>] ? devtmpfs_create_node+0x10f/0x140
[    8.369853]  [<ffffffff810c1581>] ?
__raw_callee_save___pv_queued_spin_unlock+0x11/0x20
[    8.369856]  [<ffffffff8169f29c>] ? klist_add_tail+0x3c/0x50
[    8.369859]  [<ffffffff81449af0>] ? device_add+0x270/0x600
[    8.369861]  [<ffffffff810c1581>] ?
__raw_callee_save___pv_queued_spin_unlock+0x11/0x20
[    8.369871]  [<ffffffffa00b61bf>] drm_dev_register+0xaf/0x100 [drm]
[    8.369878]  [<ffffffffa00b8ebf>] drm_get_pci_dev+0x8f/0x1e0 [drm]
[    8.369891]  [<ffffffffa02ff1fb>] i915_pci_probe+0x3b/0x60 [i915]
[    8.369893]  [<ffffffff813537b5>] local_pci_probe+0x45/0xa0
[    8.369895]  [<ffffffff81354964>] ? pci_match_device+0xf4/0x120
[    8.369896]  [<ffffffff81354ab9>] pci_device_probe+0xe9/0x130
[    8.369899]  [<ffffffff8144ce4f>] driver_probe_device+0x14f/0x420
[    8.369900]  [<ffffffff8144d1b0>] __driver_attach+0x90/0xa0
[    8.369901]  [<ffffffff8144d120>] ? driver_probe_device+0x420/0x420
[    8.369903]  [<ffffffff8144abec>] bus_for_each_dev+0x6c/0xc0
[    8.369905]  [<ffffffff81316e87>] ? ida_get_new_above+0x217/0x270
[    8.369906]  [<ffffffff8144c89e>] driver_attach+0x1e/0x20
[    8.369907]  [<ffffffff8144c3c0>] bus_add_driver+0x1d0/0x290
[    8.369909]  [<ffffffff8144dba0>] driver_register+0x60/0xe0
[    8.369910]  [<ffffffff8135313c>] __pci_register_driver+0x4c/0x50
[    8.369917]  [<ffffffffa00b90f0>] drm_pci_init+0xe0/0x110 [drm]
[    8.369918]  [<ffffffffa0411000>] ? 0xffffffffa0411000
[    8.369931]  [<ffffffffa04110a0>] i915_init+0xa0/0xa8 [i915]
[    8.369933]  [<ffffffff8100213d>] do_one_initcall+0xcd/0x1f0
[    8.369935]  [<ffffffff811b3c6e>] ? __vunmap+0xae/0xf0
[    8.369937]  [<ffffffff811cf49f>] ? kmem_cache_alloc_trace+0x17f/0x1f0
[    8.369940]  [<ffffffff816a9e8e>] ? do_init_module+0x28/0x1ea
[    8.369941]  [<ffffffff816a9ec7>] do_init_module+0x61/0x1ea
[    8.369945]  [<ffffffff810fd1bc>] load_module+0x1cfc/0x2600
[    8.369946]  [<ffffffff810f9870>] ? __symbol_put+0x60/0x60
[    8.369948]  [<ffffffff810f9bf6>] ? copy_module_from_fd.isra.54+0x116/0x170
[    8.369950]  [<ffffffff810fdcdf>] SyS_finit_module+0x9f/0xd0
[    8.369953]  [<ffffffff816b5b6e>] entry_SYSCALL_64_fastpath+0x12/0x71
[    8.369954] ---[ end trace 5e5cacb01a9cf63a ]---

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