From: Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org>
To: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
Cc: kvm-devel
<kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [announce] [patch] KVM paravirtualization for Linux
Date: Mon, 8 Jan 2007 10:43:59 +0100 [thread overview]
Message-ID: <20070108094359.GB30482@elte.hu> (raw)
In-Reply-To: <45A20F60.20207-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
* Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> wrote:
> Looks like a lot of complexity for very little gain. I'm not sure
> what the vmwrite cost is, cut it can't be that high compared to
> vmexit.
while i disagree with characterising one extra parameter passed down
plus one extra branch as 'a lot of complexity', i agree that making the
flush a NOP on VMX is even better. (if it's possible without breaking
future hardware) I guess you are right that the only true cost here is
the vmwrite cost, and that there's no impact on CR3 flushing (because it
happens unconditionally). Forget about this patch.
Ingo
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prev parent reply other threads:[~2007-01-08 9:43 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-05 21:52 [announce] [patch] KVM paravirtualization for Linux Ingo Molnar
2007-01-05 23:02 ` [kvm-devel] " Anthony Liguori
[not found] ` <20070105215223.GA5361-X9Un+BFzKDI@public.gmane.org>
2007-01-05 22:15 ` Zachary Amsden
[not found] ` <459ECDF7.9040309-pghWNbHTmq7QT0dZR+AlfA@public.gmane.org>
2007-01-05 22:30 ` Ingo Molnar
[not found] ` <20070105223009.GA15369-X9Un+BFzKDI@public.gmane.org>
2007-01-05 22:50 ` Zachary Amsden
2007-01-05 23:28 ` Ingo Molnar
2007-01-06 13:08 ` Pavel Machek
[not found] ` <20070106130817.GB5660-+ZI9xUNit7I@public.gmane.org>
2007-01-07 18:29 ` Christoph Hellwig
2007-01-08 18:18 ` Christoph Lameter
2007-01-07 12:20 ` Avi Kivity
[not found] ` <45A0E586.50806-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-01-07 17:42 ` Hollis Blanchard
2007-01-07 17:44 ` Ingo Molnar
[not found] ` <20070107174416.GA14607-X9Un+BFzKDI@public.gmane.org>
2007-01-08 8:22 ` Avi Kivity
[not found] ` <45A1FF4E.1020106-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-01-08 8:39 ` Ingo Molnar
[not found] ` <20070108083935.GB18259-X9Un+BFzKDI@public.gmane.org>
2007-01-08 9:08 ` Avi Kivity
[not found] ` <45A20A0A.70403-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-01-08 9:18 ` Ingo Molnar
[not found] ` <20070108091819.GB26587-X9Un+BFzKDI@public.gmane.org>
2007-01-08 9:31 ` Avi Kivity
[not found] ` <45A20F60.20207-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-01-08 9:43 ` Ingo Molnar [this message]
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