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[Xen-devel] Re: [PATCH] Re: cs:21768 causes guest spend more time on boo

To: Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>, "Zhang, Yang Z" <yang.z.zhang@xxxxxxxxx>
Subject: [Xen-devel] Re: [PATCH] Re: cs:21768 causes guest spend more time on boot up
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Mon, 19 Jul 2010 12:46:25 +0100
Cc: "Xu, Jiajun" <jiajun.xu@xxxxxxxxx>, "Zhang, Jianwu" <jianwu.zhang@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On 19/07/2010 11:55, "Tim Deegan" <Tim.Deegan@xxxxxxxxxxxxx> wrote:

>> Yes, I am still looking into it.  I think the address of the table is
>> not causing it, though, so it might take some time to find the real
>> cause.
> The hang turned out to be entirely unrelated to the SMBIOS tables; the
> xenbus client zeroes out teh xenstore ring entirely, and it looks like
> newer dom0 xenbus backends can't handle that, so:

What would it have to do with an in-kernel driver? Doesn't the comms page
only get looked at by [o]xenstored? In which case we could fix them.

 -- Keir

> hvmloader: don't zero out the xenbus page.
> Not all xenbus backends accept that gracefully.  Instead rely on the
> xenbus frontend in the guest being able to start up with non-zero ring
> offsets. 
> Signed-off-by: Tim Deegan <Tim.Deegan@xxxxxxxxxx>

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