From: James Courtier-Dutton <James@superbug.co.uk>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Andrew Morton <akpm@osdl.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Chris Wright <chrisw@sous-sol.org>,
Virtualization Mailing List <virtualization@lists.osdl.org>
Subject: Re: [PATCH] Add I/O hypercalls for i386 paravirt
Date: Wed, 22 Aug 2007 23:15:11 +0100 [thread overview]
Message-ID: <46CCB56F.8090308@superbug.co.uk> (raw)
In-Reply-To: <46CCB088.8070606@goop.org>
Jeremy Fitzhardinge wrote:
> Zachary Amsden wrote:
>> This patch provides hypercalls for the i386 port I/O instructions,
>> which vastly helps guests which use native-style drivers. For certain
>> VMI workloads, this provides a performance boost of up to 30%. We
>> expect KVM and lguest to be able to achieve similar gains on I/O
>> intensive workloads.
>
> Two comments:
>
> - I should dust off my "break up paravirt_ops" patch, and this would fit
> nicely into it (I think we already discussed this)
>
> - What happens if you *don't* want to pv some of the io instructions?
> What if you have a device which is directly exposed to the guest?
If one could directly expose a device to the guest, this feature could
be extremely useful for me.
Is it possible? How would it manage to handle the DMA bus mastering?
James
next prev parent reply other threads:[~2007-08-22 22:15 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-22 5:23 [PATCH] Add I/O hypercalls for i386 paravirt Zachary Amsden
2007-08-22 5:34 ` Avi Kivity
2007-08-22 5:40 ` Zachary Amsden
2007-08-22 8:37 ` Avi Kivity
2007-08-22 16:16 ` Zachary Amsden
2007-08-22 6:25 ` Rusty Russell
2007-08-22 10:35 ` Andi Kleen
2007-08-22 9:51 ` Avi Kivity
2007-08-22 11:08 ` Andi Kleen
2007-08-22 10:23 ` Avi Kivity
2007-08-22 11:23 ` Andi Kleen
2007-08-22 12:09 ` Avi Kivity
2007-08-22 13:15 ` Andi Kleen
2007-08-22 12:32 ` Avi Kivity
2007-08-22 16:11 ` Jeff Garzik
[not found] ` <1188237281.5972.69.camel@localhost.localdomain>
[not found] ` <46D3C60B.3050605@vmware.com>
2007-08-28 11:18 ` Benjamin Herrenschmidt
2007-08-22 6:00 ` H. Peter Anvin
2007-08-22 6:03 ` Zachary Amsden
2007-08-24 12:20 ` Pavel Machek
2007-08-22 10:22 ` Andi Kleen
2007-08-22 16:48 ` Zachary Amsden
2007-08-22 17:59 ` Andi Kleen
2007-08-22 17:07 ` Zachary Amsden
2007-08-22 19:46 ` Andi Kleen
2007-08-22 20:43 ` Zachary Amsden
2007-08-22 22:04 ` Andi Kleen
2007-08-22 21:25 ` Alan Cox
2007-08-22 21:41 ` Zachary Amsden
2007-08-23 5:34 ` Rusty Russell
2007-08-22 21:45 ` Zachary Amsden
2007-08-22 17:34 ` Alan Cox
2007-08-22 21:54 ` Jeremy Fitzhardinge
2007-08-22 22:15 ` James Courtier-Dutton [this message]
2007-08-22 22:20 ` Chris Wright
2007-08-22 22:29 ` James Courtier-Dutton
2007-08-22 22:34 ` Chris Wright
2007-08-22 23:14 ` Jeremy Fitzhardinge
2007-08-23 0:47 ` Andi Kleen
2007-08-23 0:38 ` Jeremy Fitzhardinge
2007-08-23 2:34 ` Andi Kleen
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