From: Alexandre Derumier <aderumier@odiso.com>
Date: Mon, 15 Jul 2013 06:51:37 +0000 (+0200)
Subject: add hyper-v enlightments for windows guests
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=462e8d19fea15376e3ec1011c23b5170309e910b;p=qemu-server.git

add hyper-v enlightments for windows guests

This add special hyper-v cpu flags for windows guests.

This improve performance and avoid some bsod related to timer.

(I currently disable the hv_vapic flag because I can't get it working).

I have tested all theses flags with: win2003, win2008R2, winxp, linux debian 64bit, on intel and amd physicals processor

It doesn't break live migration, because new cpu flags are not see by guests until a vm reset.

Signed-off-by: Alexandre Derumier <aderumier@odiso.com>
---

diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index ff5760f..62c74cc 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -2371,6 +2371,12 @@ sub config_to_command {
 	    $ost eq 'wvista') {
 	    push @$globalFlags, 'kvm-pit.lost_tick_policy=discard';
 	    push @$cmd, '-no-hpet';
+	    #push @$cpuFlags , 'hv_vapic" if !$nokvm;  #fixme, my win2008R2 hang at boot with this
+	    push @$cpuFlags , 'hv_spinlocks=0xffff' if !$nokvm;
+	}
+
+	if ($ost eq 'win7' || $ost eq 'win8') {
+	    push @$cpuFlags , 'hv_relaxed' if !$nokvm;
 	}
     }