Re: [Xen-devel] RE: [Xen-changelog] [xen-unstable]vt-d: Fixpanic in msi_msg_read_remap_rte with acpi=off

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 19/10/2009 12:18, "Miroslav Rezanina" <mrezanin@xxxxxxxxxx> wrote:

>> I'll be applying Dexuan's original replacement patch.
>> 
>>  -- Keir
>> 
> 
> I retest version with removed NULL checks and in this case, my system crashes.
> So there has to be checks for NULL or something else is wrong.

Got a backtrace and Xen boot params? If you pass acpi=off, then
disable_acpi() is invoked, and this sets acpi_disabled. If acpi_disabled=1,
then iommu_setup() sets iommu_enabled=0. If iommu_enabled=0 then I think all
the update_ire_from_* and similar hooks get disabled in the callers. So
something unexpected must be happening.

 -- Keir



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