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From: Alexandre Derumier <aderumier@odiso.com>
To: pve-devel@lists.proxmox.com
Date: Mon, 19 Jun 2023 09:28:35 +0200
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Subject: [pve-devel] [PATCH v6 qemu-server 04/10] config: memory: add 'max'
option
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max can be multiple of 64GiB only,
The dimm size is compute from the max memory
we can have 64 slots:
64GiB = 64 slots x 1GiB
128GiB = 64 slots x 2GiB
..
4TiB = 64 slots x 64GiB
Also, with numa, we need to share slot between (up to 8) sockets.
64 is a multiple of 8,
64GiB = 8 sockets * 8 slots * 1GiB
128GiB = 8 sockets * 8 slots * 2GiB
...
and with virtio-mem,
we can have 32000 blocks of 2MiB minimum
64GB = 32000 * 2MiB
Signed-off-by: Alexandre Derumier <aderumier@odiso.com>
---
PVE/QemuServer.pm | 4 ++--
PVE/QemuServer/Memory.pm | 37 ++++++++++++++++++++++++++++++++++++-
2 files changed, 38 insertions(+), 3 deletions(-)
diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index a751024..1257902 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -5062,7 +5062,7 @@ sub vmconfig_hotplug_pending {
vm_deviceunplug($vmid, $conf, $opt);
vmconfig_delete_or_detach_drive($vmid, $storecfg, $conf, $opt, $force);
} elsif ($opt =~ m/^memory$/) {
- die "skip\n" if !$hotplug_features->{memory};
+ die "skip\n" if !PVE::QemuServer::Memory::can_hotplug($hotplug_features->{memory}, $conf);
PVE::QemuServer::Memory::qemu_memory_hotplug($vmid, $conf);
} elsif ($opt eq 'cpuunits') {
$cgroup->change_cpu_shares(undef);
@@ -5138,7 +5138,7 @@ sub vmconfig_hotplug_pending {
vmconfig_update_disk($storecfg, $conf, $hotplug_features->{disk},
$vmid, $opt, $value, $arch, $machine_type);
} elsif ($opt =~ m/^memory$/) { #dimms
- die "skip\n" if !$hotplug_features->{memory};
+ die "skip\n" if !PVE::QemuServer::Memory::can_hotplug($hotplug_features->{memory}, $conf, $value);
$value = PVE::QemuServer::Memory::qemu_memory_hotplug($vmid, $conf, $value);
} elsif ($opt eq 'cpuunits') {
my $new_cpuunits = PVE::CGroup::clamp_cpu_shares($conf->{pending}->{$opt}); #clamp
diff --git a/PVE/QemuServer/Memory.pm b/PVE/QemuServer/Memory.pm
index ee73a0a..d25c79c 100644
--- a/PVE/QemuServer/Memory.pm
+++ b/PVE/QemuServer/Memory.pm
@@ -3,8 +3,10 @@ package PVE::QemuServer::Memory;
use strict;
use warnings;
-use PVE::Tools qw(run_command lock_file lock_file_full file_read_firstline dir_glob_foreach);
use PVE::Exception qw(raise raise_param_exc);
+use PVE::GuestHelpers qw(safe_num_ne);
+use PVE::JSONSchema;
+use PVE::Tools qw(run_command lock_file lock_file_full file_read_firstline dir_glob_foreach);
use PVE::QemuServer;
use PVE::QemuServer::Monitor qw(mon_cmd);
@@ -25,8 +27,28 @@ our $memory_fmt = {
minimum => 16,
default => 512,
},
+ max => {
+ description => "Maximum hotpluggable memory for the VM in MiB.",
+ type => 'integer',
+ optional => 1,
+ minimum => 65536,
+ maximum => 4194304,
+ format => 'pve-qm-memory-max',
+ },
};
+PVE::JSONSchema::register_format('pve-qm-memory-max', \&verify_qm_memory_max);
+sub verify_qm_memory_max {
+ my ($max, $noerr) = @_;
+
+ if ($max && $max % 65536 != 0) {
+ return undef if $noerr;
+ die "max memory need to be a multiple of 64GiB\n";
+ }
+
+ return $max;
+}
+
sub print_memory {
my $memory = shift;
@@ -285,6 +307,19 @@ sub qemu_memory_hotplug {
return $conf->{memory};
}
+sub can_hotplug {
+ my ($hotplug, $conf, $value) = @_;
+
+ return if !$hotplug;
+
+ my $oldmem = parse_memory($conf->{memory});
+ my $newmem = parse_memory($value);
+
+ return if safe_num_ne($newmem->{max}, $oldmem->{max});
+
+ return 1;
+}
+
sub qemu_memdevices_list {
my ($vmid, $type) = @_;
--
2.39.2