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add hyperv enlightments : hv_reset, hv_vpindex, hv_runtime

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add them by default for qemu 2.6
(support is already present in qemu 2.5, but we don't want to break live migration for current running vm)

vpindex && runtime need host kernel 4.4

Theses 3 enlightements are needed by windows to use vmbus
http://searchwindowsserver.techtarget.com/definition/Microsoft-Virtual-Machine-Bus-VMBus

details :

- When Hyper-V "vpindex" is on, guest can use MSR HV_X64_MSR_VP_INDEX
to get virtual processor ID.

- Hyper-V "runtime" enlightement feature allows to use MSR
HV_X64_MSR_VP_RUNTIME to get the time the virtual processor consumes
running guest code, as well as the time the hypervisor spends running
code on behalf of that guest.

- Hyper-V "reset" allows guest to reset VM.

Signed-off-by: Alexandre Derumier <aderumier@odiso.com>
This commit is contained in:
Alexandre Derumier 2016-05-20 10:26:08 +02:00 committed by Dietmar Maurer
parent e858e9d241
commit 7a131888d7
1 changed files with 6 additions and 0 deletions
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6
PVE/QemuServer.pm
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@ -2991,6 +2991,12 @@ sub config_to_command {
push @$cpuFlags , 'hv_vapic' if !$nokvm;
push @$cpuFlags , 'hv_time' if !$nokvm;
if (qemu_machine_feature_enabled ($machine_type, $kvmver, 2, 6)) {
push @$cpuFlags , 'hv_reset' if !$nokvm;
push @$cpuFlags , 'hv_vpindex' if !$nokvm;
push @$cpuFlags , 'hv_runtime' if !$nokvm;
}
} else {
push @$cpuFlags , 'hv_spinlocks=0xffff' if !$nokvm;
}