[libvirt] [PATCHv3] Add invariant TSC cpu flag

Ján Tomko jtomko at redhat.com
Wed Jul 2 08:09:49 UTC 2014

On 06/02/2014 10:17 PM, Eric Blake wrote:
> On 05/15/2014 02:31 AM, Ján Tomko wrote:
>> Add suport for invariant TSC flag (CPUID 0x80000007, bit 8 of EDX).
>> If this flag is enabled, the TSC ticks at a constant rate across
>> all ACPI P-, C- and T-states.
>> This can be enabled by adding:
>> <feature name='invtsc'/>
>> to the <cpu> element.
>> Migration and saving the domain does not work with this flag.
>> QEMU support for this is not merged yet:
>> https://lists.gnu.org/archive/html/qemu-devel/2014-04/msg05024.html
> In spite of Dan's ack, let's wait until it actually lands in qemu.git
> before you push this.

I have pushed the patch now that it's merged in qemu.git:

commit 303752a9068bfe84b9b05f1cd5ad5ff65b7f3ea6
Author:     Marcelo Tosatti <mtosatti at redhat.com>
AuthorDate: 2014-04-30 13:48:45 -0300
Commit:     Andreas Färber <afaerber at suse.de>
CommitDate: 2014-06-25 23:54:57 +0200

    target-i386: Support "invariant tsc" flag


-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 836 bytes
Desc: OpenPGP digital signature
URL: <http://listman.redhat.com/archives/libvir-list/attachments/20140702/cce19056/attachment-0001.sig>

More information about the libvir-list mailing list