Re: [Xen-devel] Re: how to handle paged hypercall args?

To:	Olaf Hering <olaf@xxxxxxxxx>
Subject:	Re: [Xen-devel] Re: how to handle paged hypercall args?
From:	Keir Fraser <keir@xxxxxxx>
Date:	Fri, 03 Dec 2010 06:13:43 -0800
Cc:	Patrick Colp <pjcolp@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Tim Deegan <Tim.Deegan@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx>
Delivery-date:	Fri, 03 Dec 2010 06:15:35 -0800
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Thread-topic:	[Xen-devel] Re: how to handle paged hypercall args?
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On 03/12/2010 01:03, "Olaf Hering" <olaf@xxxxxxxxx> wrote:

> in my testing the BUG_ON in __prepare_to_wait() triggers, 1500 is too
> small. I changed it to 4096 - (4*sizeof(void*)) to fix it for me.
> 3K would be enough as well.
> How large can the stack get, is there an upper limit?

It can get pretty deep with nested interrupts. I wouldn't expect a guest's
hypercall stack to get very deep at all. Send me a BUG_ON() backtrace. That
said, making the saved-stack area bigger isn't really a problem.

 -- Keir

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Re: [Xen-devel] Re: how to handle paged hypercall args?