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Message-Id: <F83E94AF-6BB0-4653-A81F-7D9F7D0B9E12@suse.de> Date: Mon, 6 Sep 2010 11:09:37 +0200 From: Alexander Graf <agraf@...e.de> To: Avi Kivity <avi@...hat.com> Cc: Xiao Guangrong <xiaoguangrong@...fujitsu.com>, Marcelo Tosatti <mtosatti@...hat.com>, LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org> Subject: Re: [PATCH] KVM: don't sent IPI if the vcpu is not online On 06.09.2010, at 11:05, Avi Kivity wrote: > On 09/06/2010 11:59 AM, Alexander Graf wrote: >> On 06.09.2010, at 10:55, Avi Kivity wrote: >> >>> On 09/06/2010 11:51 AM, Alexander Graf wrote: >>>>> I think guest_mode makes sense for the other archs for reducing IPIs, so let's leave it common and recommend that they implement it. Alex, if you're ever bored. >>>> What does the bit do? Do we have documentation on it ;)? No seriously, what's the intent of the field? >>>> >>> It indicates that the vcpu is currently executing guest code. Which in turn is important if you need to force it out of guest mode in order to inject an interrupt or flush the tlb. >> Well, a vcpu is either offline in halt state or in guest mode, no? So we can conclude that guest_mode == !offline&& !halt_state. > > It can also be running host kernel or user code. In that case it's the same as running guest code, no? We'll pass by the vcpu entry check asap. Alex -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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