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[Qemu-devel] spapr: CPU compat option works only with -global for pserie
From: |
Bharata B Rao |
Subject: |
[Qemu-devel] spapr: CPU compat option works only with -global for pseries-2.7 |
Date: |
Wed, 10 Aug 2016 20:11:16 +0530 |
User-agent: |
Mutt/1.6.1 (2016-04-27) |
Hi,
With CPU core hotplug support in pseries-2.7, we will have to specify
the compat type using -global only as we don't yet take care of parsing
-cpu cputype,compat=.
There have been patches to support that:
sPAPR specific one:
https://lists.nongnu.org/archive/html/qemu-devel/2016-06/msg07564.html
PPC generic one:
https://lists.gnu.org/archive/html/qemu-devel/2016-07/msg02676.html
but the patch isn't upstream yet.
The result is that instead of specifying
-cpu host,compat=power7 for pseries-2.7, we will have to use
-cpu host -global driver=host-powerpc64-cpu,property=compat,value=power7
This behaviour is specific to pseries-2.7 and for earlier machine types
the original way of specifying compat with -cpu works.
Will this be a concern for libvirt ? Would it be difficult for libvirt to
switch to -global when generating QEMU cmdline for compat mode for pseries-2.7
machine.
Or, should we just include one of the above patches so that
-cpu cputype,compat= continues to work for peseries-2.7 ?
Regards,
Bharata.
- [Qemu-devel] spapr: CPU compat option works only with -global for pseries-2.7,
Bharata B Rao <=