Messages in this thread | | | Date | Tue, 18 Aug 2009 00:27:46 +0300 | From | Faidon Liambotis <> | Subject | [regression, bisected] fails to boot on Dell Optiplex 760 with VT-d enabled |
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I am experiencin a bug on an Dell Optiplex 760 with a configuration that has an Intel Core2 Q9550 CPU and with an up-to-date BIOS, version A03.
When "VT for Direct I/O" is enabled in the BIOS, v2.6.30 boots and works perfectly, while v2.6.31-rc1..rc6 fail (both of them x86-64).
More specifically, I get an endless loop of printing the following messages in the screen: DMAR: [DMA Read] Request device [ff:1f.7] fault addr fffffffffffff000 DMAR: [fault reason 255] Unknown and the boot process doesn't move on from there.
I ran git bisect good v2.6.30/bad v2.6.31-rc1 and I was pointed to the following commit: 937582382c71b75b29fbb92615629494e1a05ac0 x86, intr-remap: enable interrupt remapping early
I have no idea if VT-d is functioning on v2.6.30; I just had the option enabled in the BIOS and noticed the problem when I tried to upgrade to 2.6.31-rcX.
I've read a similar bug report against a Mandriva kernel and another VT-d related bug for the same hardware against Xen and in both threads they were finger-pointing the BIOS.
I'm not sure if that's the case but, even if it is, I'd expect the system to boot, like previous versions did, perhaps printing a warning about VT-d functionality.
Thanks, Faidon
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