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    SubjectRe: [regression, bisected] fails to boot on Dell Optiplex 760 with VT-d enabled
    David Woodhouse wrote:
    > On Mon, 2009-08-17 at 14:27 -0700, Faidon Liambotis wrote:
    >> 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.
    > Is it fixed by ?
    Yes it is (v2.6.31-rc6 with 0815565a cherry-picked). Thanks!
    Should I expect this to reach v2.6.31?

    > I strongly suspect you weren't actually using the IOMMU in your
    > 'working' 2.6.30 kernel? Can you show a full log of that one booting?
    Could easily be the case, as I said, I haven't tested it (and have
    absolutely no idea how to). Full log is attached.
    Excerpt for your convienience:
    DMAR:Host address width 36
    DMAR:DRHD (flags: 0x00000000)base: 0x00000000fedc1000
    DMAR:DRHD (flags: 0x00000000)base: 0x00000000fedc2000
    DMAR:DRHD (flags: 0x00000000)base: 0x00000000fedc3000
    DMAR:DRHD (flags: 0x00000001)base: 0x00000000fedc4000
    DMAR:RMRR base: 0x00000000cda58000 end: 0x00000000cda6ffff
    DMAR:RMRR base: 0x00000000cdc00000 end: 0x00000000cfffffff
    Not all IO-APIC's listed under remapping hardware

    If it's a BIOS issue, any ideas on who to contact at Dell for this?

     \ /
      Last update: 2009-08-18 01:01    [W:0.041 / U:17.816 seconds]
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