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Broadcast supported CPU flags

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pvestatd will check if the KVM version has changed using
kvm_user_version (which automatically clears its cache if QEMU/KVM
updates), and if it has, query supported CPU flags and broadcast them as
key-value pairs to the cluster.

If detection fails, we clear the kv-store and set up a delay (120s), to not
try again too quickly.

Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
This commit is contained in:
Stefan Reiter 2019-11-21 15:53:52 +01:00 committed by Thomas Lamprecht
parent 300c0f736b
commit 00b58c8c35
1 changed files with 43 additions and 0 deletions
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43
PVE/Service/pvestatd.pm
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@ -74,6 +74,47 @@ sub hup {
$restart_request = 1;
}
my $cached_kvm_version = '';
my $next_flag_update_time;
my $failed_flag_update_delay_sec = 120;
sub update_supported_cpuflags {
my $kvm_version = PVE::QemuServer::kvm_user_version();
# only update when QEMU/KVM version has changed, as that is the only reason
# why flags could change without restarting pvestatd
return if $cached_kvm_version && $cached_kvm_version eq $kvm_version;
if ($next_flag_update_time && $next_flag_update_time > time()) {
return;
}
$next_flag_update_time = 0;
my $supported_cpuflags = eval { PVE::QemuServer::query_supported_cpu_flags() };
warn $@ if $@;
if (!$supported_cpuflags ||
(!$supported_cpuflags->{tcg} && !$supported_cpuflags->{kvm})) {
# something went wrong, clear broadcast flags and set try-again delay
warn "CPU flag detection failed, will try again after delay\n";
$next_flag_update_time = time() + $failed_flag_update_delay_sec;
$supported_cpuflags = {};
} else {
# only set cached version if there's actually something to braodcast
$cached_kvm_version = $kvm_version;
}
for my $accel ("tcg", "kvm") {
if ($supported_cpuflags->{$accel}) {
PVE::Cluster::broadcast_node_kv("cpuflags-$accel", join(' ', @{$supported_cpuflags->{$accel}}));
} else {
# clear potentially invalid data
PVE::Cluster::broadcast_node_kv("cpuflags-$accel", '');
}
}
}
my $generate_rrd_string = sub {
my ($data) = @_;
@ -90,6 +131,8 @@ sub update_node_status {
my $cpuinfo = PVE::ProcFSTools::read_cpuinfo();
my $maxcpu = $cpuinfo->{cpus};
update_supported_cpuflags();
my $subinfo = PVE::INotify::read_file('subscription');
my $sublevel = $subinfo->{level} || '';