From: Avi Kivity <avi@argo.co.il>
To: Ingo Molnar <mingo@elte.hu>
Cc: Avi Kivity <avi@qumranet.com>,
kvm-devel <kvm-devel@lists.sourceforge.net>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [kvm-devel] Guest kernel hangs in smp kvm for older kernels prior to tsc sync cleanup
Date: Wed, 19 Dec 2007 16:27:19 +0200 [thread overview]
Message-ID: <47692A47.4040803@argo.co.il> (raw)
In-Reply-To: <20071219140624.GF21282@elte.hu>
Ingo Molnar wrote:
> * Avi Kivity <avi@qumranet.com> wrote:
>
>
>> Avi Kivity wrote:
>>
>>> Testing shows wrmsr and rdtsc function normally.
>>>
>>> I'll try pinning the vcpus to cpus and see if that helps.
>>>
>>>
>> It does.
>>
>
> do we let the guest read the physical CPU's TSC? That would be trouble.
>
>
vmx (and svm) allow us to add an offset to the physical tsc. We set it
on startup to -tsc (so that an rdtsc on boot would return 0), and
massage it on vcpu migration so that guest rdtsc is monotonic.
The net effect is that tsc on a vcpu can experience large forward jumps
and changes in rate, but no negative jumps.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2007-12-19 14:27 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-18 17:20 Guest kernel hangs in smp kvm for older kernels prior to tsc sync cleanup Avi Kivity
2007-12-18 17:20 ` Avi Kivity
2007-12-18 22:19 ` Ingo Molnar
2007-12-18 22:19 ` Ingo Molnar
2007-12-19 6:33 ` Avi Kivity
2007-12-19 6:33 ` Avi Kivity
2007-12-19 11:19 ` [kvm-devel] " Avi Kivity
2007-12-19 11:19 ` Avi Kivity
2007-12-19 11:39 ` [kvm-devel] " Avi Kivity
2007-12-19 14:06 ` Ingo Molnar
2007-12-19 14:06 ` Ingo Molnar
2007-12-19 14:27 ` Avi Kivity [this message]
2007-12-19 15:32 ` [kvm-devel] " Glauber de Oliveira Costa
2007-12-19 15:32 ` Glauber de Oliveira Costa
2007-12-19 15:41 ` [kvm-devel] " Avi Kivity
2007-12-20 10:34 ` Glauber de Oliveira Costa
2007-12-20 10:34 ` Glauber de Oliveira Costa
2007-12-19 16:55 ` [kvm-devel] " Amit Shah
2007-12-19 16:55 ` Amit Shah
2007-12-19 17:04 ` [kvm-devel] Guest kernel hangs in smp kvm for older kernelsprior " Dor Laor
2007-12-19 17:04 ` Dor Laor
2007-12-19 17:09 ` [kvm-devel] " Avi Kivity
2007-12-19 17:09 ` Avi Kivity
2007-12-19 14:53 ` [kvm-devel] Guest kernel hangs in smp kvm for older kernels prior " Avi Kivity
2007-12-19 14:53 ` Avi Kivity
2007-12-19 15:09 ` [kvm-devel] " Ingo Molnar
2007-12-19 15:21 ` Avi Kivity
2007-12-19 15:21 ` Avi Kivity
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=47692A47.4040803@argo.co.il \
--to=avi@argo.co.il \
--cc=avi@qumranet.com \
--cc=kvm-devel@lists.sourceforge.net \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.