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Bug 1168881 - When running a KVM Windows guest, need to turn on all the "hv_*" flags
Summary: When running a KVM Windows guest, need to turn on all the "hv_*" flags
Keywords:
Status: CLOSED UPSTREAM
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: libosinfo
Version: 7.2
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Fabiano Fidêncio
QA Contact: Desktop QE
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2014-11-28 10:05 UTC by Giuseppe Scrivano
Modified: 2019-01-03 16:00 UTC (History)
10 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of: 1083537
Environment:
Last Closed: 2019-01-03 15:58:27 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Giuseppe Scrivano 2014-11-28 10:05:02 UTC 
+++ This bug was initially created as a clone of Bug #1083537 +++

+++ This bug was initially created as a clone of Bug #1083525 +++

Description of problem:
As of RHEL7.0 QEMU and Libvirt support several Hyper-V Enlightenment features, that need to be explicitly turned on for Windows guests. It is forbidden to turn them on for RHEL5 guests.
The QEMU flags are: "hv_relaxed,hv_spinlocks=0x1fff,hv_vapic,hv_time"

Additional info:
hv_relaxed turns off an internal Windows watchdog, and by doing so avoids some high load BSODs
hv_relaxed is also supported in RHEL6 as of RHEL6.4
All the other flags are performance optimization flags, that can improve the performance by 10% to much more (in extreme cases of resources overcommit).

Libvirt related bugs:
RHEL7
 Bug 1056205 - new cpu's flags, to control hyper-v related features - hv-time
 Bug 784836 - new cpu's flags, to control hyper-v related features
RHEL6
 Bug 864606 - [RFE] Enable Hyper-V Enlightenment for Windows guests

Note: You might want to duplicate this BZ to other RHEL7 based versions of RHOS.

--- Additional comment from Giuseppe Scrivano on 2014-11-28 05:04:12 EST ---

I think that this OS information should go into libosinfo first, and virt-manager just uses it.  Probably this requires a new API for libosinfo. 

Cloning there...
Comment 4 Fabiano Fidêncio 2019-01-03 15:58:27 UTC 
This bug report can be considered part of https://gitlab.com/libosinfo/libosinfo/issues/9 and the progress will be tracked there.

I'm closing this one as UPSTREAM. Please, feel free to re-open it or directly comment in the upstream issue.
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