[pve-devel] [PATCH qemu-server] fix Bug #615 Windows guests suddenly hangs after couple times of migration

[Alexandre DERUMIER]

Do we need this patch, with the new qemu-kvm patch ?


----- Mail original -----
De: "Wolfgang Link" <w.link at proxmox.com>
À: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Vendredi 16 Septembre 2016 13:14:51
Objet: [pve-devel] [PATCH qemu-server] fix Bug #615 Windows guests	suddenly hangs after couple times of migration

Windows has a clock/tick problem when it is live-migrated. 
This problem ends in a pseudo freeze status. 
The solution is to stop the clock, when we suspend the VM for live-migration. 

see man kvm -rtc clock=vm 

The drawback is the VM will lose a little time on every live migration. 
So with this setting it is recommended to have a time-sync client in the VM to keep the time. 
--- 
PVE/QemuServer.pm | 1 + 
1 file changed, 1 insertion(+) 

diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm 
index dbd85a0..d3eeac5 100644 
--- a/PVE/QemuServer.pm 
+++ b/PVE/QemuServer.pm 
@@ -3002,6 +3002,7 @@ sub config_to_command { 
$ostype eq 'wvista') { 
push @$globalFlags, 'kvm-pit.lost_tick_policy=discard'; 
push @$cmd, '-no-hpet'; 
+ push @$rtcFlags, 'clock=vm'; 
if (qemu_machine_feature_enabled ($machine_type, $kvmver, 2, 3)) { 
push @$cpuFlags , 'hv_spinlocks=0x1fff' if !$nokvm; 
push @$cpuFlags , 'hv_vapic' if !$nokvm; 
-- 
2.1.4 


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