re: [Xen-devel] Win2003 got blue Screen when ballooning with serial out put: "Iomem mapping not permitted"

[tinnycloud <tinnycloud@xxxxxxxxxxx>]

Hi James:

        Thanks for your help.
        Beside not handling populating page failure, it seems like PV driver
hasn't support POD yet.
        Another question is, in Linux Balloon driver, every time balloon
2MB, while in windows PV driver, the balloon unit is 1MB,
        Is there anything make this difference?

        Thanks.
        

----- -----
From: James Harper [mailto:james.harper@xxxxxxxxxxxxxxxx] 
date: 20101217 17:20
tp: Paul Durrant; tinnycloud; Steven Smith; xen-devel@xxxxxxxxxxxxxxxxxxx
cc: Keir Fraser; JBeulich@xxxxxxxxxx
subject: RE: [Xen-devel] Win2003 got blue Screen when ballooning with serial
out put: "Iomem mapping not permitted"

> 
> 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.

It does, because I had to balloon down a few pages for migration to work
(probably an old bug by now). I did put a limit as to how many failures
it was prepared to put up with though.

> As for the original crash, I guess the balloon driver is just not
handling the
> populate hypercall failure gracefully.
> 

Quite likely.

James


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