qemu-server/PVE/QemuServer/Helpers.pm
Fiona Ebner 82dff842f0 move get_vm_arch() helper to helpers module
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
2025-01-17 19:24:02 +01:00

292 lines
6.7 KiB
Perl

package PVE::QemuServer::Helpers;
use strict;
use warnings;
use File::stat;
use JSON;
use PVE::INotify;
use PVE::ProcFSTools;
use PVE::Tools qw(get_host_arch);
use base 'Exporter';
our @EXPORT_OK = qw(
min_version
config_aware_timeout
kvm_user_version
parse_number_sets
windows_version
);
my $nodename = PVE::INotify::nodename();
my $arch_to_qemu_binary = {
aarch64 => '/usr/bin/qemu-system-aarch64',
x86_64 => '/usr/bin/qemu-system-x86_64',
};
sub get_command_for_arch($) {
my ($arch) = @_;
return '/usr/bin/kvm' if get_host_arch() eq $arch; # i.e. native arch
my $cmd = $arch_to_qemu_binary->{$arch}
or die "don't know how to emulate architecture '$arch'\n";
return $cmd;
}
sub get_vm_arch {
my ($conf) = @_;
return $conf->{arch} // get_host_arch();
}
my $kvm_user_version = {};
my $kvm_mtime = {};
sub kvm_user_version {
my ($binary) = @_;
$binary //= get_command_for_arch(get_host_arch()); # get the native arch by default
my $st = stat($binary);
my $cachedmtime = $kvm_mtime->{$binary} // -1;
return $kvm_user_version->{$binary} if $kvm_user_version->{$binary} &&
$cachedmtime == $st->mtime;
$kvm_user_version->{$binary} = 'unknown';
$kvm_mtime->{$binary} = $st->mtime;
my $code = sub {
my $line = shift;
if ($line =~ m/^QEMU( PC)? emulator version (\d+\.\d+(\.\d+)?)(\.\d+)?[,\s]/) {
$kvm_user_version->{$binary} = $2;
}
};
eval { PVE::Tools::run_command([$binary, '--version'], outfunc => $code); };
warn $@ if $@;
return $kvm_user_version->{$binary};
}
# Paths and directories
our $var_run_tmpdir = "/var/run/qemu-server";
mkdir $var_run_tmpdir;
sub qmp_socket {
my ($vmid, $qga) = @_;
my $sockettype = $qga ? 'qga' : 'qmp';
return "${var_run_tmpdir}/$vmid.$sockettype";
}
sub pidfile_name {
my ($vmid) = @_;
return "${var_run_tmpdir}/$vmid.pid";
}
sub vnc_socket {
my ($vmid) = @_;
return "${var_run_tmpdir}/$vmid.vnc";
}
# Parse the cmdline of a running kvm/qemu process and return arguments as hash
sub parse_cmdline {
my ($pid) = @_;
my $fh = IO::File->new("/proc/$pid/cmdline", "r");
if (defined($fh)) {
my $line = <$fh>;
$fh->close;
return if !$line;
my @param = split(/\0/, $line);
my $cmd = $param[0];
return if !$cmd || ($cmd !~ m|kvm$| && $cmd !~ m@(?:^|/)qemu-system-[^/]+$@);
my $phash = {};
my $pending_cmd;
for (my $i = 0; $i < scalar (@param); $i++) {
my $p = $param[$i];
next if !$p;
if ($p =~ m/^--?(.*)$/) {
if ($pending_cmd) {
$phash->{$pending_cmd} = {};
}
$pending_cmd = $1;
} elsif ($pending_cmd) {
$phash->{$pending_cmd} = { value => $p };
$pending_cmd = undef;
}
}
return $phash;
}
return;
}
sub vm_running_locally {
my ($vmid) = @_;
my $pidfile = pidfile_name($vmid);
if (my $fd = IO::File->new("<$pidfile")) {
my $st = stat($fd);
my $line = <$fd>;
close($fd);
my $mtime = $st->mtime;
if ($mtime > time()) {
warn "file '$pidfile' modified in future\n";
}
if ($line =~ m/^(\d+)$/) {
my $pid = $1;
my $cmdline = parse_cmdline($pid);
if ($cmdline && defined($cmdline->{pidfile}) && $cmdline->{pidfile}->{value}
&& $cmdline->{pidfile}->{value} eq $pidfile) {
if (my $pinfo = PVE::ProcFSTools::check_process_running($pid)) {
return $pid;
}
}
}
}
return;
}
sub min_version {
my ($verstr, $major, $minor, $pve) = @_;
if ($verstr =~ m/^(\d+)\.(\d+)(?:\.(\d+))?(?:\+pve(\d+))?/) {
return 1 if version_cmp($1, $major, $2, $minor, $4, $pve) >= 0;
return 0;
}
die "internal error: cannot check version of invalid string '$verstr'";
}
# gets in pairs the versions you want to compares, i.e.:
# ($a-major, $b-major, $a-minor, $b-minor, $a-extra, $b-extra, ...)
# returns 0 if same, -1 if $a is older than $b, +1 if $a is newer than $b
sub version_cmp {
my @versions = @_;
my $size = scalar(@versions);
return 0 if $size == 0;
if ($size & 1) {
my (undef, $fn, $line) = caller(0);
die "cannot compare odd count of versions, called from $fn:$line\n";
}
for (my $i = 0; $i < $size; $i += 2) {
my ($a, $b) = splice(@versions, 0, 2);
$a //= 0;
$b //= 0;
return 1 if $a > $b;
return -1 if $a < $b;
}
return 0;
}
sub config_aware_timeout {
my ($config, $memory, $is_suspended) = @_;
my $timeout = 30;
# Based on user reported startup time for vm with 512GiB @ 4-5 minutes
if (defined($memory) && $memory > 30720) {
$timeout = int($memory/1024);
}
# When using PCI passthrough, users reported much higher startup times,
# growing with the amount of memory configured. Constant factor chosen
# based on user reports.
if (grep(/^hostpci[0-9]+$/, keys %$config)) {
$timeout *= 4;
}
if ($is_suspended && $timeout < 300) {
$timeout = 300;
}
if ($config->{hugepages} && $timeout < 150) {
$timeout = 150;
}
# Some testing showed that adding a NIC increased the start time by ~450ms
# consistently across different NIC models, options and already existing
# number of NICs.
# So 10x that to account for any potential system differences seemed
# reasonable. User reports with real-life values (20+: ~50s, 25: 45s, 17: 42s)
# also make this seem a good value.
my $nic_count = scalar (grep { /^net\d+/ } keys %{$config});
$timeout += $nic_count * 5;
return $timeout;
}
sub get_node_pvecfg_version {
my ($node) = @_;
my $nodes_version_info = PVE::Cluster::get_node_kv('version-info', $node);
return if !$nodes_version_info->{$node};
my $version_info = decode_json($nodes_version_info->{$node});
return $version_info->{version};
}
sub pvecfg_min_version {
my ($verstr, $major, $minor, $release) = @_;
return 0 if !$verstr;
if ($verstr =~ m/^(\d+)\.(\d+)(?:[.-](\d+))?/) {
return 1 if version_cmp($1, $major, $2, $minor, $3 // 0, $release) >= 0;
return 0;
}
die "internal error: cannot check version of invalid string '$verstr'";
}
sub parse_number_sets {
my ($set) = @_;
my $res = [];
foreach my $part (split(/;/, $set)) {
if ($part =~ /^\s*(\d+)(?:-(\d+))?\s*$/) {
die "invalid range: $part ($2 < $1)\n" if defined($2) && $2 < $1;
push @$res, [ $1, $2 ];
} else {
die "invalid range: $part\n";
}
}
return $res;
}
sub windows_version {
my ($ostype) = @_;
return 0 if !$ostype;
my $winversion = 0;
if($ostype eq 'wxp' || $ostype eq 'w2k3' || $ostype eq 'w2k') {
$winversion = 5;
} elsif($ostype eq 'w2k8' || $ostype eq 'wvista') {
$winversion = 6;
} elsif ($ostype =~ m/^win(\d+)$/) {
$winversion = $1;
}
return $winversion;
}
sub needs_extraction {
my ($vtype, $fmt) = @_;
return $vtype eq 'import' && $fmt =~ m/^ova\+(.*)$/;
}
1;