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Re: [Xen-devel] Xen 4.0.0x allows for data corruption in Dom0

To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Xen 4.0.0x allows for data corruption in Dom0
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Tue, 9 Mar 2010 14:03:53 +0200
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Joanna Rutkowska <joanna@xxxxxxxxxxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx>, Daniel Stodden <Daniel.Stodden@xxxxxxxxxx>
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On Tue, Mar 09, 2010 at 10:43:41AM +0000, Keir Fraser wrote:
> On 09/03/2010 10:25, "Pasi Kärkkäinen" <pasik@xxxxxx> wrote:
> >>> How about these being vcpu_time_info structures? The fields
> >>> appear to all make sense. The only thing not matching this would
> >>> be a few differently looking corruption entries sent earlier by Joanna,
> >>> so this may not be the only thing. But it would explain why with 3.4.2
> >>> the issue is not present.
> >> 
> >> Pasi, can you try the attached patch (which simply stubs out the new
> >> VCPUOP_register_vcpu_time_memory_area hypercall)?
> > 
> > Yeah, but there's no patch attached ;)
> Good point. Attached now!

I grabbed the latest rc6-pre xen-unstable.hg (*), applied your patch, compiled,
copied xen-4.0.0-rc6-pre.gz to /boot and booted using it. I didn't change 
anything else.

It seems the bug went away. No more corruption. I repeated the test three times.

-- Pasi

(*) earlier on this system I was using 4.0.0-rc5 built from src.rpm.

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