From: Avi Kivity <avi@redhat.com>
To: Joerg Roedel <joro@8bytes.org>
Cc: Zachary Amsden <zamsden@redhat.com>, KVM <kvm@vger.kernel.org>,
Marcelo Tosatti <mtosatti@redhat.com>,
Glauber Costa <glommer@redhat.com>,
Linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: KVM timekeeping fixes, V2
Date: Sun, 18 Jul 2010 17:22:27 +0300 [thread overview]
Message-ID: <4C430E23.9070707@redhat.com> (raw)
In-Reply-To: <20100716192637.GK23755@8bytes.org>
On 07/16/2010 10:26 PM, Joerg Roedel wrote:
> On Fri, Jul 16, 2010 at 07:20:32AM -1000, Zachary Amsden wrote:
>
>
>> I've been very careful to keep nested SVM safe, but I've not got a good
>> test for that. Is there any test suite for the nested case?
>>
> To test this you can boot a nested Linux guest and let both, L1 and L2
> guest use kvm_clock. Then put some load into the L2 guest and see if the
> L2 or the L1 freezes hard (which happens with kvm_clock when the TSC
> went backwards for one of them).
>
>
With recent guests, they won't freeze any more, since we detect the tsc
going backwards and compensate (in a brute-force way, nothing clever).
But you can printk the maximum compensation and see if it's something
unreasonable.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2010-07-18 14:22 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-13 2:25 KVM timekeeping fixes, V2 Zachary Amsden
2010-07-13 2:25 ` [PATCH 01/18] Make TSC offset writes non-preemptible Zachary Amsden
2010-07-13 21:33 ` Rik van Riel
2010-07-18 14:28 ` Avi Kivity
2010-07-18 14:30 ` Avi Kivity
2010-07-13 2:25 ` [PATCH 02/18] Fix SVM VMCB reset Zachary Amsden
2010-07-13 21:37 ` Rik van Riel
2010-07-13 2:25 ` [PATCH 03/18] TSC reset compensation Zachary Amsden
2010-07-13 22:11 ` Rik van Riel
2010-07-18 14:34 ` Avi Kivity
2010-07-19 20:01 ` Zachary Amsden
2010-07-13 2:25 ` [PATCH 04/18] Make cpu_tsc_khz updates use local CPU Zachary Amsden
2010-07-14 14:41 ` Rik van Riel
2010-07-18 14:45 ` Avi Kivity
2010-07-19 20:06 ` Zachary Amsden
2010-07-20 8:53 ` Avi Kivity
2010-07-20 21:57 ` Zachary Amsden
2010-07-13 2:25 ` [PATCH 05/18] Warn about unstable TSC Zachary Amsden
2010-07-14 15:02 ` Rik van Riel
2010-07-18 14:47 ` Avi Kivity
2010-07-13 2:25 ` [PATCH 06/18] Unify TSC logic Zachary Amsden
2010-07-14 15:53 ` Rik van Riel
2010-07-13 2:25 ` [PATCH 07/18] Fix deep C-state TSC desynchronization Zachary Amsden
2010-07-14 16:14 ` Rik van Riel
2010-07-13 2:25 ` [PATCH 08/18] Add helper functions for time computation Zachary Amsden
2010-07-14 19:02 ` Rik van Riel
2010-07-13 2:25 ` [PATCH 09/18] Robust TSC compensation Zachary Amsden
2010-07-13 20:34 ` Marcelo Tosatti
2010-07-13 21:15 ` Zachary Amsden
2010-07-13 21:42 ` David S. Ahern
2010-07-13 21:45 ` Zachary Amsden
2010-07-13 23:32 ` Zachary Amsden
2010-07-14 22:33 ` Rik van Riel
2010-07-18 14:52 ` Avi Kivity
2010-07-19 20:39 ` Zachary Amsden
2010-07-13 2:25 ` [PATCH 10/18] Keep SMP VMs more in sync on unstable TSC Zachary Amsden
2010-07-15 2:13 ` Rik van Riel
2010-07-13 2:25 ` [PATCH 11/18] Perform hardware_enable in CPU_STARTING callback Zachary Amsden
2010-07-15 2:15 ` Rik van Riel
2010-07-13 2:25 ` [PATCH 12/18] Add clock sync request to hardware enable Zachary Amsden
2010-07-15 2:32 ` Rik van Riel
2010-07-13 2:25 ` [PATCH 13/18] Move scale_delta into common header Zachary Amsden
2010-07-15 2:35 ` Rik van Riel
2010-07-13 2:25 ` [PATCH 14/18] Fix a possible backwards warp of kvmclock Zachary Amsden
2010-07-15 2:37 ` Rik van Riel
2010-07-13 2:25 ` [PATCH 15/18] Implement getnsboottime kernel API Zachary Amsden
2010-07-15 2:41 ` Rik van Riel
2010-07-18 15:07 ` Avi Kivity
2010-07-13 2:25 ` [PATCH 16/18] Use getnsboottime in KVM Zachary Amsden
2010-07-15 2:43 ` Rik van Riel
2010-07-13 2:25 ` [PATCH 17/18] Indicate reliable TSC in kvmclock Zachary Amsden
2010-07-15 2:44 ` Rik van Riel
2010-07-13 2:25 ` [PATCH 18/18] Add timekeeping documentation Zachary Amsden
2010-07-14 7:16 ` Takuya Yoshikawa
2010-07-14 20:28 ` Zachary Amsden
2010-07-16 13:19 ` KVM timekeeping fixes, V2 Joerg Roedel
2010-07-16 17:20 ` Zachary Amsden
2010-07-16 19:26 ` Joerg Roedel
2010-07-18 14:22 ` Avi Kivity [this message]
2010-07-18 15:08 ` Avi Kivity
2010-07-19 8:11 ` Zachary Amsden
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