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

["Cui, Dexuan" <dexuan.cui@xxxxxxxxx>]

Miroslav Rezanina wrote:
> ----- "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx> wrote:
> 
>> From: "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx>
>> To: "Miroslav Rezanina" <mrezanin@xxxxxxxxxx>
>> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, "Dexuan Cui"
>> <dexuan.cui@xxxxxxxxx> 
>> Sent: Monday, October 19, 2009 1:43:49 PM GMT +01:00 Amsterdam /
>> Berlin / Bern / Rome / Stockholm / Vienna Subject: Re: [Xen-devel]
>> RE: [Xen-changelog] [xen-unstable]vt-d: Fixpanic in
>> msi_msg_read_remap_rte with acpi=off  
>> 
>> 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
>> 
>> 
> Unfortunately, machine I'm working on has no serial output enabled. I
> try to  reproduce this on a machine where I can get log. I try
> xen-3.4-testing c/s 19785: 7e2169ea6687 (that is eqaul to
> xen-unstable c/s 20338: 5f28661bb2bb. Without checks - machine
> crashes during boot (when trying to init eth2)  
> with checks - machine boots successfully.
> ----
> Grub conf:
>         kernel /xen-3.4.2-rc1-pre.gz acpi=off iommu=1
>         module /vmlinuz-2.6.18.8 ro root=LABEL=/ rhgb
>         module /initrd-2.6.18.8.img

Strange... Looks before iommu_setup(), no IOAPIC IRTE read/write and msi msg 
read/write would occur.
Hi Miroslav, can you attach your serial log of the crash when you use 
xen-3.4-testing 19785? It's interesting to me. :-)

-- Dexuan

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel