From: Marcelo Tosatti <mtosatti@redhat.com>
To: Sheng Yang <sheng@linux.intel.com>
Cc: Avi Kivity <avi@redhat.com>, kvm@vger.kernel.org
Subject: Re: [PATCH 0/3] Emulate MSI-X mask bits for assigned devices
Date: Thu, 30 Sep 2010 13:44:51 -0300 [thread overview]
Message-ID: <20100930164451.GC29881@amt.cnet> (raw)
In-Reply-To: <1285667052-24907-1-git-send-email-sheng@linux.intel.com>
On Tue, Sep 28, 2010 at 05:44:09PM +0800, Sheng Yang wrote:
> Hi Avi & Marcelo
>
> This patchset would add emulation of MSI-X mask bit for assigned devices in
> QEmu.
>
> BTW: We are also purposed an acceleration of MSI-X mask bit for KVM - to get
> it done in kernel. That's because sometime MSI-X mask bit was accessed very
> frequently by guest and emulation in QEmu cost a lot(tens to hundreds percent
> CPU utilization sometime), e.g. guest using Linux 2.6.18 or under some heavy
> workload. The method has been proved efficient in Xen, but it would require
> VMM to handle MSI-X table. Is that OK with you?
It would be good to understand where that cost is, before. Eg. do you
commit kvm irq route frequently when guest unmasks?
next prev parent reply other threads:[~2010-09-30 16:45 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-28 9:44 [PATCH 0/3] Emulate MSI-X mask bits for assigned devices Sheng Yang
2010-09-28 9:44 ` [PATCH 1/3] KVM: Emulation " Sheng Yang
2010-09-28 13:36 ` Michael S. Tsirkin
2010-09-29 1:17 ` Sheng Yang
2010-09-30 16:25 ` Marcelo Tosatti
2010-09-29 8:36 ` Avi Kivity
2010-09-30 5:41 ` Sheng Yang
2010-10-03 13:03 ` Avi Kivity
2010-10-11 9:32 ` Sheng Yang
2010-09-30 16:18 ` Marcelo Tosatti
2010-10-11 9:49 ` Sheng Yang
2010-10-11 17:11 ` Marcelo Tosatti
2010-10-03 11:12 ` Michael S. Tsirkin
2010-10-11 9:28 ` Sheng Yang
2010-10-11 10:01 ` Michael S. Tsirkin
2010-10-12 6:49 ` Sheng Yang
2010-10-12 18:28 ` Michael S. Tsirkin
2010-10-13 1:03 ` Sheng Yang
2010-10-13 10:35 ` Michael S. Tsirkin
2010-10-12 18:30 ` Michael S. Tsirkin
2010-10-13 0:58 ` Sheng Yang
2010-10-13 12:03 ` Michael S. Tsirkin
2010-09-28 9:44 ` [PATCH 2/3] qemu-kvm: device assignment: Some clean up for MSI-X code Sheng Yang
2010-09-28 9:44 ` [PATCH 3/3] qemu-kvm: device assignment: emulate MSI-X mask bits Sheng Yang
2010-09-30 16:44 ` Marcelo Tosatti [this message]
2010-10-11 9:34 ` [PATCH 0/3] Emulate MSI-X mask bits for assigned devices Sheng Yang
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