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

[Miroslav Rezanina <mrezanin@xxxxxxxxxx>]

----- "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
-- 
Miroslav Rezanina
Software Engineer - Virtualization Team - XEN kernel


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