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DescriptionGiuseppe 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...
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.