mirror of
https://git.proxmox.com/git/qemu-server
synced 2025-04-29 18:18:26 +00:00
2cf203194b
While, usually, the slot should match the ID, it's not explicitly guaranteed and relies on QEMU internals. Using the numerical ID is more future-proof and more consistent with plugging, where no slot information (except the maximum limit) is relied upon. Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
650 lines
19 KiB
Perl
650 lines
19 KiB
Perl
package PVE::QemuServer::Memory;
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use strict;
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use warnings;
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use PVE::Tools qw(run_command lock_file lock_file_full file_read_firstline dir_glob_foreach);
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use PVE::Exception qw(raise raise_param_exc);
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use PVE::QemuServer;
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use PVE::QemuServer::Monitor qw(mon_cmd);
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my $MAX_NUMA = 8;
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my $STATICMEM = 1024;
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my $_host_bits;
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sub get_host_phys_address_bits {
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return $_host_bits if defined($_host_bits);
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my $fh = IO::File->new ('/proc/cpuinfo', "r") or return;
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while (defined(my $line = <$fh>)) {
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# hopefully we never need to care about mixed (big.LITTLE) archs
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if ($line =~ m/^address sizes\s*:\s*(\d+)\s*bits physical/i) {
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$_host_bits = int($1);
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$fh->close();
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return $_host_bits;
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}
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}
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$fh->close();
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return; # undef, cannot really do anything..
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}
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my sub get_max_mem {
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my ($conf) = @_;
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my $cpu = {};
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if (my $cpu_prop_str = $conf->{cpu}) {
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$cpu = PVE::JSONSchema::parse_property_string('pve-vm-cpu-conf', $cpu_prop_str)
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or die "Cannot parse cpu description: $cpu_prop_str\n";
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}
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my $bits;
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if (my $phys_bits = $cpu->{'phys-bits'}) {
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if ($phys_bits eq 'host') {
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$bits = get_host_phys_address_bits();
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} elsif ($phys_bits =~ /^(\d+)$/) {
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$bits = int($phys_bits);
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}
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}
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if (!defined($bits)) {
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my $host_bits = get_host_phys_address_bits() // 36; # fixme: what fallback?
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if ($cpu->{cputype} && $cpu->{cputype} =~ /^(host|max)$/) {
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$bits = $host_bits;
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} else {
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$bits = $host_bits > 40 ? 40 : $host_bits; # take the smaller one
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}
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}
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$bits = $bits & ~1; # round down to nearest even as limit is lower with odd bit sizes
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# heuristic: remove 20 bits to get MB and half that as QEMU needs some overhead
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my $bits_to_max_mem = int(1<<($bits - 21));
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return $bits_to_max_mem > 4*1024*1024 ? 4*1024*1024 : $bits_to_max_mem;
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}
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sub get_numa_node_list {
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my ($conf) = @_;
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my @numa_map;
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for (my $i = 0; $i < $MAX_NUMA; $i++) {
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my $entry = $conf->{"numa$i"} or next;
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my $numa = PVE::QemuServer::parse_numa($entry) or next;
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push @numa_map, $i;
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}
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return @numa_map if @numa_map;
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my $sockets = $conf->{sockets} || 1;
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return (0..($sockets-1));
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}
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sub host_numanode_exists {
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my ($id) = @_;
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return -d "/sys/devices/system/node/node$id/";
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}
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# only valid when numa nodes map to a single host node
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sub get_numa_guest_to_host_map {
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my ($conf) = @_;
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my $map = {};
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for (my $i = 0; $i < $MAX_NUMA; $i++) {
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my $entry = $conf->{"numa$i"} or next;
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my $numa = PVE::QemuServer::parse_numa($entry) or next;
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$map->{$i} = print_numa_hostnodes($numa->{hostnodes});
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}
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return $map if %$map;
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my $sockets = $conf->{sockets} || 1;
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return {map { $_ => $_ } (0..($sockets-1))};
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}
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sub foreach_dimm{
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my ($conf, $vmid, $memory, $sockets, $func) = @_;
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my $dimm_id = 0;
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my $current_size = 0;
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my $dimm_size = 0;
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if($conf->{hugepages} && $conf->{hugepages} == 1024) {
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$current_size = 1024 * $sockets;
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$dimm_size = 1024;
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} else {
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$current_size = 1024;
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$dimm_size = 512;
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}
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return if $current_size == $memory;
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my @numa_map = get_numa_node_list($conf);
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for (my $j = 0; $j < 8; $j++) {
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for (my $i = 0; $i < 32; $i++) {
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my $name = "dimm${dimm_id}";
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$dimm_id++;
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my $numanode = $numa_map[$i % @numa_map];
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$current_size += $dimm_size;
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&$func($conf, $vmid, $name, $dimm_size, $numanode, $current_size, $memory);
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return $current_size if $current_size >= $memory;
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}
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$dimm_size *= 2;
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}
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}
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sub qemu_memory_hotplug {
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my ($vmid, $conf, $defaults, $value) = @_;
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return $value if !PVE::QemuServer::check_running($vmid);
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my $sockets = $conf->{sockets} || 1;
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my $memory = $conf->{memory} || $defaults->{memory};
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$value = $defaults->{memory} if !$value;
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return $value if $value == $memory;
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my $static_memory = $STATICMEM;
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$static_memory = $static_memory * $sockets if ($conf->{hugepages} && $conf->{hugepages} == 1024);
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die "memory can't be lower than $static_memory MB" if $value < $static_memory;
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my $MAX_MEM = get_max_mem($conf);
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die "you cannot add more memory than max mem $MAX_MEM MB!\n" if $value > $MAX_MEM;
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if ($value > $memory) {
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my $numa_hostmap;
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foreach_dimm($conf, $vmid, $value, $sockets, sub {
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my ($conf, $vmid, $name, $dimm_size, $numanode, $current_size, $memory) = @_;
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return if $current_size <= $conf->{memory};
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if ($conf->{hugepages}) {
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$numa_hostmap = get_numa_guest_to_host_map($conf) if !$numa_hostmap;
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my $hugepages_size = hugepages_size($conf, $dimm_size);
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my $path = hugepages_mount_path($hugepages_size);
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my $host_numanode = $numa_hostmap->{$numanode};
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my $hugepages_topology->{$hugepages_size}->{$host_numanode} = hugepages_nr($dimm_size, $hugepages_size);
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my $code = sub {
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my $hugepages_host_topology = hugepages_host_topology();
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hugepages_allocate($hugepages_topology, $hugepages_host_topology);
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eval { mon_cmd($vmid, "object-add", 'qom-type' => "memory-backend-file", id => "mem-$name", size => int($dimm_size*1024*1024), 'mem-path' => $path, share => JSON::true, prealloc => JSON::true ) };
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if (my $err = $@) {
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hugepages_reset($hugepages_host_topology);
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die $err;
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}
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hugepages_pre_deallocate($hugepages_topology);
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};
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eval { hugepages_update_locked($code); };
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} else {
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eval { mon_cmd($vmid, "object-add", 'qom-type' => "memory-backend-ram", id => "mem-$name", size => int($dimm_size*1024*1024) ) };
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}
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if (my $err = $@) {
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eval { PVE::QemuServer::qemu_objectdel($vmid, "mem-$name"); };
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die $err;
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}
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eval { mon_cmd($vmid, "device_add", driver => "pc-dimm", id => "$name", memdev => "mem-$name", node => $numanode) };
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if (my $err = $@) {
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eval { PVE::QemuServer::qemu_objectdel($vmid, "mem-$name"); };
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die $err;
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}
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#update conf after each succesful module hotplug
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$conf->{memory} = $current_size;
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PVE::QemuConfig->write_config($vmid, $conf);
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});
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} else {
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my $dimms = qemu_memdevices_list($vmid, 'dimm');
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my $current_size = $memory;
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for my $name (sort { ($b =~ /^dimm(\d+)$/)[0] <=> ($a =~ /^dimm(\d+)$/)[0] } keys %$dimms) {
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my $dimm_size = $dimms->{$name}->{size} / 1024 / 1024;
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last if $current_size <= $value;
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print "try to unplug memory dimm $name\n";
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my $retry = 0;
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while (1) {
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eval { PVE::QemuServer::qemu_devicedel($vmid, $name) };
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sleep 3;
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my $dimm_list = qemu_memdevices_list($vmid, 'dimm');
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last if !$dimm_list->{$name};
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raise_param_exc({ $name => "error unplug memory module" }) if $retry > 5;
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$retry++;
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}
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$current_size -= $dimm_size;
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#update conf after each succesful module unplug
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$conf->{memory} = $current_size;
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eval { PVE::QemuServer::qemu_objectdel($vmid, "mem-$name"); };
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PVE::QemuConfig->write_config($vmid, $conf);
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}
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}
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return $conf->{memory};
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}
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sub qemu_memdevices_list {
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my ($vmid, $type) = @_;
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my $dimmarray = mon_cmd($vmid, "query-memory-devices");
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my $dimms = {};
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foreach my $dimm (@$dimmarray) {
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next if $type && $dimm->{data}->{id} !~ /^$type(\d+)$/;
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$dimms->{$dimm->{data}->{id}}->{id} = $dimm->{data}->{id};
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$dimms->{$dimm->{data}->{id}}->{node} = $dimm->{data}->{node};
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$dimms->{$dimm->{data}->{id}}->{addr} = $dimm->{data}->{addr};
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$dimms->{$dimm->{data}->{id}}->{size} = $dimm->{data}->{size};
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$dimms->{$dimm->{data}->{id}}->{slot} = $dimm->{data}->{slot};
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}
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return $dimms;
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}
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sub config {
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my ($conf, $vmid, $sockets, $cores, $defaults, $hotplug, $cmd) = @_;
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my $memory = $conf->{memory} || $defaults->{memory};
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my $static_memory = 0;
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if ($hotplug) {
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die "NUMA needs to be enabled for memory hotplug\n" if !$conf->{numa};
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my $MAX_MEM = get_max_mem($conf);
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die "Total memory is bigger than ${MAX_MEM}MB\n" if $memory > $MAX_MEM;
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for (my $i = 0; $i < $MAX_NUMA; $i++) {
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die "cannot enable memory hotplugging with custom NUMA topology\n"
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if $conf->{"numa$i"};
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}
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my $sockets = $conf->{sockets} || 1;
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$static_memory = $STATICMEM;
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$static_memory = $static_memory * $sockets if ($conf->{hugepages} && $conf->{hugepages} == 1024);
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die "minimum memory must be ${static_memory}MB\n" if($memory < $static_memory);
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push @$cmd, '-m', "size=${static_memory},slots=255,maxmem=${MAX_MEM}M";
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} else {
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$static_memory = $memory;
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push @$cmd, '-m', $static_memory;
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}
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die "numa needs to be enabled to use hugepages" if $conf->{hugepages} && !$conf->{numa};
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if ($conf->{numa}) {
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my $numa_totalmemory = undef;
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for (my $i = 0; $i < $MAX_NUMA; $i++) {
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next if !$conf->{"numa$i"};
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my $numa = PVE::QemuServer::parse_numa($conf->{"numa$i"});
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next if !$numa;
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# memory
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die "missing NUMA node$i memory value\n" if !$numa->{memory};
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my $numa_memory = $numa->{memory};
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$numa_totalmemory += $numa_memory;
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my $mem_object = print_mem_object($conf, "ram-node$i", $numa_memory);
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# cpus
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my $cpulists = $numa->{cpus};
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die "missing NUMA node$i cpus\n" if !defined($cpulists);
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my $cpus = join(',cpus=', map {
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my ($start, $end) = @$_;
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defined($end) ? "$start-$end" : $start
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} @$cpulists);
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# hostnodes
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my $hostnodelists = $numa->{hostnodes};
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if (defined($hostnodelists)) {
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my $hostnodes = print_numa_hostnodes($hostnodelists);
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# policy
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my $policy = $numa->{policy};
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die "you need to define a policy for hostnode $hostnodes\n" if !$policy;
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$mem_object .= ",host-nodes=$hostnodes,policy=$policy";
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} else {
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die "numa hostnodes need to be defined to use hugepages" if $conf->{hugepages};
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}
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push @$cmd, '-object', $mem_object;
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push @$cmd, '-numa', "node,nodeid=$i,cpus=$cpus,memdev=ram-node$i";
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}
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die "total memory for NUMA nodes must be equal to vm static memory\n"
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if $numa_totalmemory && $numa_totalmemory != $static_memory;
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#if no custom tology, we split memory and cores across numa nodes
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if (!$numa_totalmemory) {
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my $numa_memory = ($static_memory / $sockets);
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for (my $i = 0; $i < $sockets; $i++) {
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die "host NUMA node$i doesn't exist\n"
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if !host_numanode_exists($i) && $conf->{hugepages};
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my $mem_object = print_mem_object($conf, "ram-node$i", $numa_memory);
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push @$cmd, '-object', $mem_object;
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my $cpus = ($cores * $i);
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$cpus .= "-" . ($cpus + $cores - 1) if $cores > 1;
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push @$cmd, '-numa', "node,nodeid=$i,cpus=$cpus,memdev=ram-node$i";
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}
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}
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}
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if ($hotplug) {
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foreach_dimm($conf, $vmid, $memory, $sockets, sub {
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my ($conf, $vmid, $name, $dimm_size, $numanode, $current_size, $memory) = @_;
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my $mem_object = print_mem_object($conf, "mem-$name", $dimm_size);
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push @$cmd, "-object" , $mem_object;
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push @$cmd, "-device", "pc-dimm,id=$name,memdev=mem-$name,node=$numanode";
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die "memory size ($memory) must be aligned to $dimm_size for hotplugging\n"
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if $current_size > $memory;
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});
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}
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}
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sub print_mem_object {
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my ($conf, $id, $size) = @_;
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if ($conf->{hugepages}) {
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my $hugepages_size = hugepages_size($conf, $size);
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my $path = hugepages_mount_path($hugepages_size);
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return "memory-backend-file,id=$id,size=${size}M,mem-path=$path,share=on,prealloc=yes";
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} else {
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return "memory-backend-ram,id=$id,size=${size}M";
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}
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}
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sub print_numa_hostnodes {
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my ($hostnodelists) = @_;
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my $hostnodes;
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foreach my $hostnoderange (@$hostnodelists) {
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my ($start, $end) = @$hostnoderange;
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$hostnodes .= ',' if $hostnodes;
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$hostnodes .= $start;
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$hostnodes .= "-$end" if defined($end);
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$end //= $start;
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for (my $i = $start; $i <= $end; ++$i ) {
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die "host NUMA node$i doesn't exist\n" if !host_numanode_exists($i);
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}
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}
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return $hostnodes;
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}
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sub hugepages_mount {
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my $mountdata = PVE::ProcFSTools::parse_proc_mounts();
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foreach my $size (qw(2048 1048576)) {
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next if (! -d "/sys/kernel/mm/hugepages/hugepages-${size}kB");
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my $path = "/run/hugepages/kvm/${size}kB";
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my $found = grep {
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$_->[2] =~ /^hugetlbfs/ &&
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$_->[1] eq $path
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} @$mountdata;
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if (!$found) {
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File::Path::make_path($path) if (!-d $path);
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my $cmd = ['/bin/mount', '-t', 'hugetlbfs', '-o', "pagesize=${size}k", 'hugetlbfs', $path];
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run_command($cmd, errmsg => "hugepage mount error");
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}
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}
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}
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sub hugepages_mount_path {
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my ($size) = @_;
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$size = $size * 1024;
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return "/run/hugepages/kvm/${size}kB";
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}
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sub hugepages_nr {
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my ($size, $hugepages_size) = @_;
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return $size / $hugepages_size;
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}
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sub hugepages_chunk_size_supported {
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my ($size) = @_;
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return -d "/sys/kernel/mm/hugepages/hugepages-". ($size * 1024) ."kB";
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}
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sub hugepages_size {
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my ($conf, $size) = @_;
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die "hugepages option is not enabled" if !$conf->{hugepages};
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die "memory size '$size' is not a positive even integer; cannot use for hugepages\n"
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if $size <= 0 || $size & 1;
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die "your system doesn't support hugepages\n"
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if !hugepages_chunk_size_supported(2) && !hugepages_chunk_size_supported(1024);
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if ($conf->{hugepages} eq 'any') {
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# try to use 1GB if available && memory size is matching
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if (hugepages_chunk_size_supported(1024) && ($size & 1023) == 0) {
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return 1024;
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} elsif (hugepages_chunk_size_supported(2)) {
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return 2;
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} else {
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die "host only supports 1024 GB hugepages, but requested size '$size' is not a multiple of 1024 MB\n"
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}
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} else {
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my $hugepagesize = $conf->{hugepages};
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if (!hugepages_chunk_size_supported($hugepagesize)) {
|
|
die "your system doesn't support hugepages of $hugepagesize MB\n";
|
|
} elsif (($size % $hugepagesize) != 0) {
|
|
die "Memory size $size is not a multiple of the requested hugepages size $hugepagesize\n";
|
|
}
|
|
|
|
return $hugepagesize
|
|
}
|
|
}
|
|
|
|
sub hugepages_topology {
|
|
my ($conf, $hotplug) = @_;
|
|
|
|
my $hugepages_topology = {};
|
|
|
|
return if !$conf->{numa};
|
|
|
|
my $defaults = PVE::QemuServer::load_defaults();
|
|
my $memory = $conf->{memory} || $defaults->{memory};
|
|
my $static_memory = 0;
|
|
my $sockets = $conf->{sockets} || 1;
|
|
my $numa_custom_topology = undef;
|
|
|
|
if ($hotplug) {
|
|
$static_memory = $STATICMEM;
|
|
$static_memory = $static_memory * $sockets if ($conf->{hugepages} && $conf->{hugepages} == 1024);
|
|
} else {
|
|
$static_memory = $memory;
|
|
}
|
|
|
|
#custom numa topology
|
|
for (my $i = 0; $i < $MAX_NUMA; $i++) {
|
|
next if !$conf->{"numa$i"};
|
|
my $numa = PVE::QemuServer::parse_numa($conf->{"numa$i"});
|
|
next if !$numa;
|
|
|
|
$numa_custom_topology = 1;
|
|
my $numa_memory = $numa->{memory};
|
|
my $hostnodelists = $numa->{hostnodes};
|
|
my $hostnodes = print_numa_hostnodes($hostnodelists);
|
|
|
|
die "more than 1 hostnode value in numa node is not supported when hugepages are enabled" if $hostnodes !~ m/^(\d)$/;
|
|
my $hugepages_size = hugepages_size($conf, $numa_memory);
|
|
$hugepages_topology->{$hugepages_size}->{$hostnodes} += hugepages_nr($numa_memory, $hugepages_size);
|
|
|
|
}
|
|
|
|
#if no custom numa tology, we split memory and cores across numa nodes
|
|
if(!$numa_custom_topology) {
|
|
|
|
my $numa_memory = ($static_memory / $sockets);
|
|
|
|
for (my $i = 0; $i < $sockets; $i++) {
|
|
|
|
my $hugepages_size = hugepages_size($conf, $numa_memory);
|
|
$hugepages_topology->{$hugepages_size}->{$i} += hugepages_nr($numa_memory, $hugepages_size);
|
|
}
|
|
}
|
|
|
|
if ($hotplug) {
|
|
my $numa_hostmap = get_numa_guest_to_host_map($conf);
|
|
|
|
foreach_dimm($conf, undef, $memory, $sockets, sub {
|
|
my ($conf, undef, $name, $dimm_size, $numanode, $current_size, $memory) = @_;
|
|
|
|
$numanode = $numa_hostmap->{$numanode};
|
|
|
|
my $hugepages_size = hugepages_size($conf, $dimm_size);
|
|
$hugepages_topology->{$hugepages_size}->{$numanode} += hugepages_nr($dimm_size, $hugepages_size);
|
|
});
|
|
}
|
|
|
|
return $hugepages_topology;
|
|
}
|
|
|
|
sub hugepages_host_topology {
|
|
|
|
#read host hugepages
|
|
my $hugepages_host_topology = {};
|
|
|
|
dir_glob_foreach("/sys/devices/system/node/", 'node(\d+)', sub {
|
|
my ($nodepath, $numanode) = @_;
|
|
|
|
dir_glob_foreach("/sys/devices/system/node/$nodepath/hugepages/", 'hugepages\-(\d+)kB', sub {
|
|
my ($hugepages_path, $hugepages_size) = @_;
|
|
|
|
$hugepages_size = $hugepages_size / 1024;
|
|
my $hugepages_nr = PVE::Tools::file_read_firstline("/sys/devices/system/node/$nodepath/hugepages/$hugepages_path/nr_hugepages");
|
|
$hugepages_host_topology->{$hugepages_size}->{$numanode} = $hugepages_nr;
|
|
});
|
|
});
|
|
|
|
return $hugepages_host_topology;
|
|
}
|
|
|
|
sub hugepages_allocate {
|
|
my ($hugepages_topology, $hugepages_host_topology) = @_;
|
|
|
|
#allocate new hupages if needed
|
|
foreach my $size (sort keys %$hugepages_topology) {
|
|
|
|
my $nodes = $hugepages_topology->{$size};
|
|
|
|
foreach my $numanode (keys %$nodes) {
|
|
|
|
my $hugepages_size = $size * 1024;
|
|
my $hugepages_requested = $hugepages_topology->{$size}->{$numanode};
|
|
my $path = "/sys/devices/system/node/node${numanode}/hugepages/hugepages-${hugepages_size}kB/";
|
|
my $hugepages_free = PVE::Tools::file_read_firstline($path."free_hugepages");
|
|
my $hugepages_nr = PVE::Tools::file_read_firstline($path."nr_hugepages");
|
|
|
|
if ($hugepages_requested > $hugepages_free) {
|
|
my $hugepages_needed = $hugepages_requested - $hugepages_free;
|
|
PVE::ProcFSTools::write_proc_entry($path."nr_hugepages", $hugepages_nr + $hugepages_needed);
|
|
#verify that is correctly allocated
|
|
$hugepages_free = PVE::Tools::file_read_firstline($path."free_hugepages");
|
|
if ($hugepages_free < $hugepages_requested) {
|
|
#rollback to initial host config
|
|
hugepages_reset($hugepages_host_topology);
|
|
die "hugepage allocation failed";
|
|
}
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
sub hugepages_default_nr_hugepages {
|
|
my ($size) = @_;
|
|
|
|
my $cmdline = PVE::Tools::file_read_firstline("/proc/cmdline");
|
|
my $args = PVE::Tools::split_args($cmdline);
|
|
|
|
my $parsed_size = 2; # default is 2M
|
|
|
|
foreach my $arg (@$args) {
|
|
if ($arg eq "hugepagesz=2M") {
|
|
$parsed_size = 2;
|
|
} elsif ($arg eq "hugepagesz=1G") {
|
|
$parsed_size = 1024;
|
|
} elsif ($arg =~ m/^hugepages=(\d+)?$/) {
|
|
if ($parsed_size == $size) {
|
|
return $1;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
sub hugepages_pre_deallocate {
|
|
my ($hugepages_topology) = @_;
|
|
|
|
foreach my $size (sort keys %$hugepages_topology) {
|
|
|
|
my $hugepages_size = $size * 1024;
|
|
my $path = "/sys/kernel/mm/hugepages/hugepages-${hugepages_size}kB/";
|
|
my $hugepages_nr = hugepages_default_nr_hugepages($size);
|
|
PVE::ProcFSTools::write_proc_entry($path."nr_hugepages", $hugepages_nr);
|
|
}
|
|
}
|
|
|
|
sub hugepages_reset {
|
|
my ($hugepages_topology) = @_;
|
|
|
|
foreach my $size (sort keys %$hugepages_topology) {
|
|
|
|
my $nodes = $hugepages_topology->{$size};
|
|
foreach my $numanode (keys %$nodes) {
|
|
|
|
my $hugepages_nr = $hugepages_topology->{$size}->{$numanode};
|
|
my $hugepages_size = $size * 1024;
|
|
my $path = "/sys/devices/system/node/node${numanode}/hugepages/hugepages-${hugepages_size}kB/";
|
|
|
|
PVE::ProcFSTools::write_proc_entry($path."nr_hugepages", $hugepages_nr);
|
|
}
|
|
}
|
|
}
|
|
|
|
sub hugepages_update_locked {
|
|
my ($code, @param) = @_;
|
|
|
|
my $timeout = 60; #could be long if a lot of hugepages need to be alocated
|
|
|
|
my $lock_filename = "/var/lock/hugepages.lck";
|
|
|
|
my $res = lock_file($lock_filename, $timeout, $code, @param);
|
|
die $@ if $@;
|
|
|
|
return $res;
|
|
}
|
|
1;
|
|
|