From: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
To: Ulrich Drepper <drepper-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Re: Paravirt KVM capabilities
Date: Wed, 10 Jan 2007 20:35:43 +0200 [thread overview]
Message-ID: <45A531FF.6080505@qumranet.com> (raw)
In-Reply-To: <45A53005.30300-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Ulrich Drepper wrote:
> Avi Kivity wrote:
>
>> [[Can't a paravirtualized kernel use a vdso to use int $0x80 instead of
>> syscall?]]
>>
>
> No. The ABI is to inline syscall instructions. That's possible since
> it's not as limited/broken as sysenter.
>
Then maybe kvm+npt+paravirt can indeed be competitive with pure paravirt.
Although npt requires up to 16 accesses for a tlb fill, usually all but
two will be cached on a moderately sized guest, so I don't expect the
cost to be prohibitive.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
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next prev parent reply other threads:[~2007-01-10 18:35 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-09 14:19 Paravirt KVM capabilities Hugo Mills
[not found] ` <20070109141916.GA13276-qdzjUQGjHNdnxAzMjxVBUbVCufUGDwFn@public.gmane.org>
2007-01-09 14:27 ` Avi Kivity
[not found] ` <45A3A642.1030604-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-01-09 23:20 ` Rusty Russell
[not found] ` <1168384852.19646.161.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2007-01-10 9:47 ` Ingo Molnar
[not found] ` <20070110094750.GA934-X9Un+BFzKDI@public.gmane.org>
2007-01-10 10:09 ` Ulrich Drepper
[not found] ` <45A4BB74.9010102-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2007-01-10 10:18 ` Ingo Molnar
[not found] ` <20070110101839.GA6444-X9Un+BFzKDI@public.gmane.org>
2007-01-10 10:43 ` Avi Kivity
[not found] ` <45A4C345.5050404-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-01-10 10:52 ` Ingo Molnar
[not found] ` <20070110105202.GA13412-X9Un+BFzKDI@public.gmane.org>
2007-01-10 11:03 ` Avi Kivity
[not found] ` <45A4C7ED.8090003-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-01-10 11:14 ` Ingo Molnar
[not found] ` <20070110111442.GA16867-X9Un+BFzKDI@public.gmane.org>
2007-01-10 11:42 ` Avi Kivity
2007-01-10 18:00 ` Ulrich Drepper
[not found] ` <45A529DB.4030009-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2007-01-10 18:12 ` Avi Kivity
[not found] ` <45A52C8B.70608-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-01-10 18:27 ` Ulrich Drepper
[not found] ` <45A53005.30300-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2007-01-10 18:35 ` Avi Kivity [this message]
2007-01-10 17:00 ` Anthony Liguori
[not found] ` <45A51BA2.9090005-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2007-01-10 17:23 ` Avi Kivity
2007-01-11 0:42 ` Rusty Russell
[not found] ` <1168476120.19646.209.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2007-01-11 0:49 ` Ingo Molnar
[not found] ` <20070111004957.GA3279-X9Un+BFzKDI@public.gmane.org>
2007-01-11 2:39 ` Rusty Russell
[not found] ` <1168483188.19646.241.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2007-01-11 2:51 ` Ingo Molnar
[not found] ` <20070111025130.GB21368-X9Un+BFzKDI@public.gmane.org>
2007-01-11 3:21 ` Rusty Russell
[not found] ` <1168485696.19646.250.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2007-01-11 9:38 ` Ingo Molnar
2007-01-10 10:46 ` Rusty Russell
[not found] ` <1168425985.19646.205.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2007-01-10 11:00 ` sean-cz32UWRuVxBIf6P1QZMOBw
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