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cpuflags : remove -rdtscp for Opteron cpu models

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rdtscp is not supported by qemu and with enforce it's not starting
warning: host doesn't support requested feature: CPUID.80000001H:EDX.rdtscp [bit 27]

from to qemu wiki
http://wiki.qemu.org/Features/CPUModels#Disabling_features_that_were_always_disabled_on_KVM
"Fact: currently libvirt runs CPU models having rdtscp without the "enforce" flag, and rdtscp is silently disabled
Consequence: libvirt SHOULD use something like "-cpu Opteron_G5,-rdtscp",
especially when it starts using (or emulating) enforce mode
This will require a solution on libvirt side. QEMU will just provide the mechanisms to report CPU model information
and check what the host and QEMU supports, but the decision to disable rdtscp to be able
to run Opteron_G[2345] needs to be taken by libvirt."

Signed-off-by: Alexandre Derumier <aderumier@odiso.com>
This commit is contained in:
Alexandre Derumier 2015-07-08 10:49:06 +02:00 committed by Dietmar Maurer
parent 7d930a0e7e
commit 0dc48c3d5b
1 changed files with 2 additions and 0 deletions
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2
PVE/QemuServer.pm
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@ -2842,6 +2842,8 @@ sub config_to_command {
push @$cpuFlags, '+sep' if $cpu eq 'kvm64' || $cpu eq 'kvm32';
push @$cpuFlags, '-rdtscp' if $cpu =~ m/^Opteron/;
if (qemu_machine_feature_enabled ($machine_type, $kvmver, 2, 3)) {
push @$cpuFlags , '+kvm_pv_unhalt' if !$nokvm;