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RE: [Xen-devel] [PATCH 2/2] passthrough: deliver IRQs even if bsp is hal

To: 'Kouya Shimura' <kouya@xxxxxxxxxxxxxx>, "'xen-devel@xxxxxxxxxxxxxxxxxxx'" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] [PATCH 2/2] passthrough: deliver IRQs even if bsp is halted (support kexec/kdump on hvm)
From: "Han, Weidong" <weidong.han@xxxxxxxxx>
Date: Tue, 30 Jun 2009 16:53:50 +0800
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Cc: 'Keir Fraser' <keir.fraser@xxxxxxxxxxxxx>
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Thread-topic: [Xen-devel] [PATCH 2/2] passthrough: deliver IRQs even if bsp is halted (support kexec/kdump on hvm)
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.

Regards,
Weidong
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