Re: [Xen-devel] [PATCH 2/2] passthrough: deliver IRQs even if bsp is halted (support kexec/kdump on hvm)

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 30/06/2009 09:53, "Han, Weidong" <weidong.han@xxxxxxxxx> wrote:

> Kouya Shimura wrote:
>> This patch is needed for kexec/kdump on hvm since kdump halts bsp.
>> 
>> Signed-off-by: Kouya Shimura <kouya@xxxxxxxxxxxxxx>
> 
> It kicks every online vcpu. The result will be more unnecessary IPIs,
> especially the vcpu# is big. Therefore increase cost of interrupt handling of
> assigned devices.

Actually it breaks out of the loop as soon as it kicks one. But still all
vcpus will pile into hvm_dirq_assist() on every vmexit, which is quite
undesirable too.

 -- Keir



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