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

[Olaf Hering <olaf@xxxxxxxxx>]

On Mon, Nov 15, Keir Fraser wrote:

> On 15/11/2010 12:04, "Tim Deegan" <Tim.Deegan@xxxxxxxxxx> wrote:

> > Will it
> > need per-vcpu stacks? (and will they, in turn, use order>0 allocations? :))
> 
> Of a sort. I propose to keep the per-pcpu stacks and then copy context
> to/from a per-vcpu memory area for the setjmp-like behaviour. Guest call
> stacks won't be very deep -- I reckon a 1kB or 2kB per-vcpu area will
> suffice.

Keir,

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?

Olaf


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