From: Avi Kivity <avi@redhat.com>
To: Alexander Graf <agraf@suse.de>
Cc: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
LKML <linux-kernel@vger.kernel.org>, KVM <kvm@vger.kernel.org>
Subject: Re: [PATCH] KVM: don't sent IPI if the vcpu is not online
Date: Mon, 06 Sep 2010 11:55:07 +0300 [thread overview]
Message-ID: <4C84AC6B.4090306@redhat.com> (raw)
In-Reply-To: <DCCDD62D-CE92-453A-BB3C-DF878D893C3F@suse.de>
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.
The procedure is:
remote:
- queue a request in vcpu->requests
- IPI vcpu->cpu (new: only if in guest_mode)
vcpu:
- set guest_mode
- dequeue and execute requests in vcpu->requests
- enter guest
- clear guest_mode
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2010-09-06 8:55 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-03 4:12 [PATCH] KVM: don't sent IPI if the vcpu is not online Xiao Guangrong
2010-09-05 7:18 ` Avi Kivity
2010-09-06 1:48 ` Xiao Guangrong
2010-09-06 5:46 ` Avi Kivity
2010-09-06 8:51 ` Alexander Graf
2010-09-06 8:55 ` Avi Kivity [this message]
2010-09-06 8:59 ` Alexander Graf
2010-09-06 9:05 ` Avi Kivity
2010-09-06 9:09 ` Alexander Graf
2010-09-06 9:14 ` Avi Kivity
2010-09-06 9:19 ` Alexander Graf
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