Bug 798936 - enable architectural PMU cpuid leaf for kvm
Summary: enable architectural PMU cpuid leaf for kvm
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: qemu-kvm
Version: 6.3
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Gleb Natapov
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2012-03-01 10:37 UTC by Gleb Natapov
Modified: 2013-12-09 00:56 UTC (History)
10 users (show)

Fixed In Version: qemu-kvm-0.12.1.2-2.244.el6
Doc Type: Bug Fix
Doc Text:
Cause Running qemu with -cpu host does not expose emulated PMU to a guest. Consequence Guest cannot use PMU counters. Fix If host kernel support PMU emulation expose cpuid.0AH leaf to a guest. Result Guest can use PMU counters to profile itself
Clone Of:
Environment:
Last Closed: 2012-06-20 11:44:08 UTC
Target Upstream Version:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2012:0746 0 normal SHIPPED_LIVE qemu-kvm bug fix and enhancement update 2012-06-19 19:31:48 UTC

Description Gleb Natapov 2012-03-01 10:37:41 UTC 
Needed for guest PMU support.
Comment 8 Michal Novotny 2012-05-04 13:02:11 UTC 
    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
NEEDINFO
Comment 9 Gleb Natapov 2012-05-06 10:42:34 UTC 
    Technical note updated. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    Diffed Contents:
@@ -1 +1,11 @@
-NEEDINFO+Cause
+  Running qemu with -cpu host does not expose emulated PMU to a guest.  
+
+Consequence
+ Guest cannot use PMU counters.
+
+Fix
+ If host kernel support PMU emulation expose cpuid.0AH leaf to a guest.
+
+Result
+ Guest can use PMU counters to profile itself
Comment 10 errata-xmlrpc 2012-06-20 11:44:08 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2012-0746.html
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