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Bug 630650 - Need audit of recent upstream changes in AMD cpuid data..
Summary: Need audit of recent upstream changes in AMD cpuid data..
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: qemu-kvm
Version: 6.2
Hardware: x86_64
OS: Linux
low
medium
Target Milestone: beta
: 6.1
Assignee: Eduardo Habkost
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks: 580953
TreeView+ depends on / blocked
 
Reported: 2010-09-06 14:24 UTC by john cooper
Modified: 2014-07-25 03:46 UTC (History)
8 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2011-12-07 12:55:34 UTC
Target Upstream Version:
Embargoed:


Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Bugzilla 632257 0 low CLOSED Duplicate CPU fea.tures in cpu-x86_64.conf 2021-02-22 00:41:40 UTC

Description john cooper 2010-09-06 14:24:33 UTC
Description of problem:

    Case entered as a placeholder.  Currently proposed upstream changes in
    cpuid data for AMD cpus may need to be represented in both upstream
    and rhel6 cpu model config definitions pending outcome.  Ref:

    http://linux.derkeiler.com/Mailing-Lists/Kernel/2010-09/msg02234.html

Version-Release number of selected component (if applicable):


How reproducible:


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Additional info:

Comment 2 john cooper 2010-10-12 06:59:02 UTC
Moving content of this bug to 632257 as it is related, more general,
and requires the same testing treatment.]

*** This bug has been marked as a duplicate of bug 632257 ***

Comment 3 john cooper 2010-10-16 05:24:55 UTC
Ugh.  Reopening this as after further consideration the associated
upstream AMD cpu feature changes don't impact current models and
don't constitute an issue for 6.1.  Support of them is almost
certain to be a future issue so here is a synopsis of what is
needed thus far:

8000_0001:ecx 1<<11  XOP
8000_0001:ecx 1<<15  LWP
8000_0001:ecx 1<<16  FMA4
8000_0001:ecx 1<<21  TMB
8000_0001:ecx 1<<22  TOPOEXT

0000_0001:ecx 1<<25  AES

[the following are more complex to address as the current qemu feature
flags scheme does not address Fn8000_000A as model configurable]

8000_000A:edx 1<<4  TSCRATEMSR
8000_000A:edx 1<<5  VMCBCLEAN
8000_000A:edx 1<<6  FLUSHBYASID
8000_000A:edx 1<<7  DECODEASSISTS
8000_000A:edx 1<<10  PAUSEFILTER
8000_000A:edx 1<<11  PFTHRESHOLD

This also best pushed upstream along with new AMD
models requiring these feature flags.


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