From: Marcelo Tosatti <mtosatti@redhat.com>
To: "chenliang (T)" <chenliang88@huawei.com>
Cc: "Gonglei (Arei)" <arei.gonglei@huawei.com>,
"Huangweidong (C)" <weidong.huang@huawei.com>,
"Andreas Färber" <afaerber@suse.de>,
"Eduardo Habkost" <ehabkost@redhat.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [PULL 17/19] target-i386: Support "invariant tsc" flag
Date: Fri, 8 Aug 2014 18:42:26 -0300 [thread overview]
Message-ID: <20140808214225.GB13545@amt.cnet> (raw)
In-Reply-To: <047A6D07C7C75B4D95D277304F90FDF22198A240@SZXEML506-MBS.china.huawei.com>
Chen Liang,
On Fri, Aug 08, 2014 at 07:07:59AM +0000, chenliang (T) wrote:
> Hi,
> We found that value of host cpus tsc are same to echo other when host has invariant tsc flag.
What you mean exactly?
Do you have a test program?
> But it is not in vm. The problem is that offset of vcpus tsc are not equal. The offset is set when
> vcpu is created. Is it ok to set same offset? And is it reasonable?
>
> Best regards
> Chen Liang
The code at kvm_write_tsc(), in the kernel (arch/x86/kvm/x86.c), should
adjust the vcpu tsc offsets properly resulting in cross SMP TSCs being
equal in the VM.
next prev parent reply other threads:[~2014-08-08 21:43 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-25 22:12 [Qemu-devel] [PULL 00/19] QOM CPUState patch queue 2014-06-26 Andreas Färber
2014-06-25 22:12 ` [Qemu-devel] [PULL 01/19] target-i386: kvm: Don't enable MONITOR by default on any CPU model Andreas Färber
2014-06-25 22:12 ` [Qemu-devel] [PULL 02/19] target-i386: Simplify reporting of unavailable features Andreas Färber
2014-06-25 22:12 ` [Qemu-devel] [PULL 03/19] target-i386: Merge feature filtering/checking functions Andreas Färber
2014-06-25 22:12 ` [Qemu-devel] [PULL 04/19] target-i386: Pass FeatureWord argument to report_unavailable_features() Andreas Färber
2014-06-25 22:12 ` [Qemu-devel] [PULL 05/19] target-i386: Isolate KVM-specific code on CPU feature filtering logic Andreas Färber
2014-06-25 22:12 ` [Qemu-devel] [PULL 06/19] target-i386: Make TCG feature filtering more readable Andreas Färber
2014-06-25 22:12 ` [Qemu-devel] [PULL 07/19] target-i386: Filter FEAT_7_0_EBX TCG features too Andreas Färber
2014-06-25 22:12 ` [Qemu-devel] [PULL 08/19] target-i386: Filter KVM and 0xC0000001 features on TCG Andreas Färber
2014-06-25 22:12 ` [Qemu-devel] [PULL 09/19] target-i386: Define TCG_*_FEATURES earlier in cpu.c Andreas Färber
2014-06-25 22:12 ` [Qemu-devel] [PULL 10/19] target-i386: Loop-based copying and setting/unsetting of feature words Andreas Färber
2014-06-25 22:12 ` [Qemu-devel] [PULL 11/19] target-i386: Loop-based feature word filtering in TCG mode Andreas Färber
2014-06-25 22:12 ` [Qemu-devel] [PULL 12/19] target-i386: Support check/enforce flags in TCG mode, too Andreas Färber
2014-06-25 22:12 ` [Qemu-devel] [PULL 13/19] target-i386: Add "migratable" property to "host" CPU model Andreas Färber
2014-06-25 22:12 ` [Qemu-devel] [PULL 14/19] target-i386: Set migratable=yes by default on "host" CPU mooel Andreas Färber
2014-06-25 22:12 ` [Qemu-devel] [PULL 15/19] savevm: check vmsd for migratability status Andreas Färber
2014-06-25 22:12 ` [Qemu-devel] [PULL 16/19] target-i386: block migration and savevm if invariant tsc is exposed Andreas Färber
2014-06-25 22:12 ` [Qemu-devel] [PULL 17/19] target-i386: Support "invariant tsc" flag Andreas Färber
2014-08-08 7:07 ` chenliang (T)
2014-08-08 21:42 ` Marcelo Tosatti [this message]
2014-06-25 22:12 ` [Qemu-devel] [PULL 18/19] target-i386: Fix indentation of CPU model definitions Andreas Färber
2014-06-25 22:12 ` [Qemu-devel] [PULL 19/19] target-i386: Broadwell CPU model Andreas Färber
2014-06-26 12:57 ` [Qemu-devel] [PULL 00/19] QOM CPUState patch queue 2014-06-26 Peter Maydell
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