Re: [Xen-devel] [patch] make hypercall_preempt_check() a little more sensitive

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 30 Mar 2006, at 18:17, Hollis Blanchard wrote:

> It would be an invasive patch to PowerPC Linux to modify the code that
> disables the EE bit and additionally have it modify
> vcpu_info->evtchn_upcall_mask, especially when that code is in 
> assembly.
> Instead, we can have hypercall_preempt_check() also check MSR:EE 
> directly.
> IA64 may be able to use this facility as well, so I've CC'ed that list.
>
> This patch fixes a problem where an event occurs, Linux calls back 
> into Xen
> for e.g. console output, Xen sees that an event is pending and creates 
> a
> continuation and returns... loop forever.

I'd rather move event_pending() into asm/event.h and then you can 
monkey with it as you like. That'll also catch other uses of 
event_pending() where you probably also want the same extra check. I 
don't really want a proliferation of extra little functions called 
arch_xxx.

 -- Keir


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