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add hyper-v enlightments for windows guests

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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>
This commit is contained in:
Alexandre Derumier 2013-07-15 08:51:37 +02:00 committed by Dietmar Maurer
parent 2e1a5389f7
commit 462e8d19fe
1 changed files with 6 additions and 0 deletions
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6
PVE/QemuServer.pm
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@ -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;
}
}