[Bug 42782] IO_PAGE_FAULT while starting xorg

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=42782





--- Comment #11 from Reartes Guillermo <rtguille@gmail.com>  2012-06-26 15:11:16 ---
I booted with iommu=pt kernel parameter and i stopped getting these messages.

I am experimenting with pcie kvm pass-through, so i ended using that parameter.
Sadly the whole host freezes when i power on the guest, but that is outside of
this bug-report.

> In my case, it only happens at POWER-ON, not when doing a RESET.
> So to reproduce it one must POWER-CYCLE.

I don't think that was actually not 100% accurate.

~~~~~~~~

# dmesg| grep -i amd-vi                                                         
[    1.774021] AMD-Vi: device: 00:00.2 cap: 0040 seg: 0 flags: 3e info 1300
[    1.774024] AMD-Vi:        mmio-addr: 00000000feb20000
[    1.774259] AMD-Vi:   DEV_SELECT_RANGE_START  devid: 00:00.0 flags: 00
[    1.774262] AMD-Vi:   DEV_RANGE_END           devid: 00:00.2
[    1.774264] AMD-Vi:   DEV_SELECT                      devid: 00:02.0 flags:
00
[    1.774266] AMD-Vi:   DEV_SELECT_RANGE_START  devid: 01:00.0 flags: 00
[    1.774268] AMD-Vi:   DEV_RANGE_END           devid: 01:00.1
[    1.774270] AMD-Vi:   DEV_SELECT                      devid: 00:04.0 flags:
00
[    1.774272] AMD-Vi:   DEV_SELECT                      devid: 02:00.0 flags:
00
[    1.774274] AMD-Vi:   DEV_SELECT                      devid: 00:05.0 flags:
00
[    1.774275] AMD-Vi:   DEV_SELECT                      devid: 03:00.0 flags:
00
[    1.774277] AMD-Vi:   DEV_SELECT                      devid: 00:06.0 flags:
00
[    1.774279] AMD-Vi:   DEV_SELECT                      devid: 04:00.0 flags:
00
[    1.774281] AMD-Vi:   DEV_SELECT                      devid: 00:09.0 flags:
00
[    1.774283] AMD-Vi:   DEV_SELECT                      devid: 05:00.0 flags:
00
[    1.774284] AMD-Vi:   DEV_SELECT                      devid: 00:11.0 flags:
00
[    1.774286] AMD-Vi:   DEV_SELECT_RANGE_START  devid: 00:12.0 flags: 00
[    1.774288] AMD-Vi:   DEV_RANGE_END           devid: 00:12.2
[    1.774290] AMD-Vi:   DEV_SELECT_RANGE_START  devid: 00:13.0 flags: 00
[    1.774292] AMD-Vi:   DEV_RANGE_END           devid: 00:13.2
[    1.774294] AMD-Vi:   DEV_SELECT                      devid: 00:14.0 flags:
d7
[    1.774296] AMD-Vi:   DEV_SELECT                      devid: 00:14.3 flags:
00
[    1.774297] AMD-Vi:   DEV_SELECT                      devid: 00:14.4 flags:
00
[    1.774300] AMD-Vi:   DEV_ALIAS_RANGE                 devid: 06:00.0 flags:
00 devid_to: 00:14.4
[    1.774302] AMD-Vi:   DEV_RANGE_END           devid: 06:1f.7
[    1.774311] AMD-Vi:   DEV_SELECT                      devid: 00:14.5 flags:
00
[    1.774313] AMD-Vi:   DEV_SELECT                      devid: 00:15.0 flags:
00
[    1.774315] AMD-Vi:   DEV_SELECT                      devid: 07:00.0 flags:
00
[    1.774317] AMD-Vi:   DEV_SELECT                      devid: 00:15.1 flags:
00
[    1.774319] AMD-Vi:   DEV_SELECT                      devid: 08:00.0 flags:
00
[    1.774320] AMD-Vi:   DEV_SELECT_RANGE_START  devid: 00:16.0 flags: 00
[    1.774322] AMD-Vi:   DEV_RANGE_END           devid: 00:16.2
[    1.774428] AMD-Vi: Enabling IOMMU at 0000:00:00.2 cap 0x40
[    1.827755] AMD-Vi: Initialized for Passthrough Mode

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