From: "Michael S. Tsirkin" <mst@redhat.com>
To: Gleb Natapov <gleb@redhat.com>
Cc: kvm@vger.kernel.org
Subject: Re: [PATCHv1 dont apply] RFC: kvm eoi PV using shared memory
Date: Mon, 16 Apr 2012 22:01:29 +0300 [thread overview]
Message-ID: <20120416190128.GB20294@redhat.com> (raw)
In-Reply-To: <20120416175116.GB5541@redhat.com>
On Mon, Apr 16, 2012 at 08:51:16PM +0300, Gleb Natapov wrote:
> > > Only when eoi is pending. This is rare.
> >
> > This is exactly while guest handles an interrupt.
> > It's not all that rare at all: e.g. device
> > drivers cause an exit from interrupt
> > handler by doing io.
> So eoi will be coalesced with io that device driver does. Exactly what
> we want.
It won't. While we handle interrupts eoi is still set.
So there will be a couple of tests + read from userspace
Wasted not a huge overhead but it's the principle of the thing.
--
MST
next prev parent reply other threads:[~2012-04-16 19:01 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-10 13:27 [PATCHv0 dont apply] RFC: kvm eoi PV using shared memory Michael S. Tsirkin
2012-04-10 14:03 ` Avi Kivity
2012-04-10 14:26 ` Michael S. Tsirkin
2012-04-10 14:33 ` Avi Kivity
2012-04-10 14:53 ` Michael S. Tsirkin
2012-04-10 15:00 ` Avi Kivity
2012-04-10 15:14 ` Michael S. Tsirkin
2012-04-10 16:08 ` Avi Kivity
2012-04-10 17:06 ` Michael S. Tsirkin
2012-04-10 17:59 ` Gleb Natapov
2012-04-10 19:30 ` Michael S. Tsirkin
2012-04-10 19:33 ` Gleb Natapov
2012-04-10 19:40 ` Michael S. Tsirkin
2012-04-10 19:42 ` Gleb Natapov
2012-04-15 16:18 ` [PATCHv1 " Michael S. Tsirkin
2012-04-16 10:08 ` Gleb Natapov
2012-04-16 11:09 ` Michael S. Tsirkin
2012-04-16 11:24 ` Gleb Natapov
2012-04-16 12:18 ` Michael S. Tsirkin
2012-04-16 12:30 ` Gleb Natapov
2012-04-16 13:13 ` Michael S. Tsirkin
2012-04-16 15:10 ` Gleb Natapov
2012-04-16 16:33 ` Michael S. Tsirkin
2012-04-16 17:51 ` Gleb Natapov
2012-04-16 19:01 ` Michael S. Tsirkin [this message]
2012-04-17 8:45 ` Gleb Natapov
2012-04-16 17:24 ` Michael S. Tsirkin
2012-04-16 17:37 ` Gleb Natapov
2012-04-16 18:56 ` Michael S. Tsirkin
2012-04-17 8:59 ` Gleb Natapov
2012-04-17 9:24 ` Avi Kivity
2012-04-17 9:22 ` Avi Kivity
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