If the frontend GPL PV storport driver is not ignoring block write failures in
crashdump mode then you are unlikely the get a good dump from the ballooned
down VM.
As for the original crash, I guess the balloon driver is just not handling the
populate hypercall failure gracefully.
Paul
> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of tinnycloud
> Sent: 17 December 2010 03:24
> To: Steven Smith; xen-devel@xxxxxxxxxxxxxxxxxxx
> Cc: james.harper@xxxxxxxxxxxxxxxx; Keir Fraser; JBeulich@xxxxxxxxxx
> Subject: [Xen-devel] Win2003 got blue Screen when ballooning with
> serial out put: "Iomem mapping not permitted"
>
> Hi Steven:
>
> I was trying to make use of balloon driver on my win2003 HVM
> Guests,
> but confront a Guest crash problem with blue screen.
> The serial output is much like
> (XEN)grant_table.c:555:d0 Iomem mapping not permitted
> ffffffffffffffff
>
> My pvdriver changeset is 823. From
> http://xenbits.xensource.com/ext/win-pvdrivers.hg
> Xen is 4.0.0
>
> I've done quite a lot experiments to locate the crash, and
> finally
> make it easy to reproduce.
> Here is the situation:
>
> 1) Start several Win2003 Guest with 2G memory to occupy host
> memory
> till from xm info | grep free to see xen has only almost 3G memory
> 2) Start another Guest with 2G memory, say domain X, and set
> its
> target to be 512M, after balloon, dom X will has only 512M, and xen
> has 2.5G
> memory
> 3) Start another Guest with 2G memory, then xen will have
> only 0.5G
> memory left
> 4) At this time, I set the domain X target to 2G (use
> xenstore-write
> /local/domain/x/memory/target 2097152)
> 5) domain X got blue screen at once. With code says 0x0000007f
> (0x0000000d, 0x00000000, 0x00000000, 0x00000000)"
>
> So, in short, when a domain wants more memory, it deflates
> its
> balloon, but if Xen doesn't enough memory, the domain will crash.
>
> I've go through
> http://lists.xensource.com/archives/html/xen-devel/2010-
> 01/msg01230.html
>
> http://lists.xensource.com/archives/html/xen-devel/2010-
> 02/msg00074.html
>
> it looks like the crash is because windows crash dumper go
> through
> those balloon out pages
> and from the discuss it would be harmless, but why I got this
> crash?
>
> Could you kindly offer me some help, thanks.
>
>
>
>
> _______________________________________________
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> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
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