[pve-devel] [PATCH qemu-server v12 4/6] migration: add check_non_migratable_resources function

[Markus Frank]

The function checks for resources that cannot be migrated, snapshoted,
or suspended.

To run this function while the snapshot lock is active, the
pve-guest-common patch 'AbstractConfig: add abstract method to check for
resources preventing a snapshot.' is required.

Signed-off-by: Markus Frank <m.frank at proxmox.com>
---
changes v12:
* added overwrite of abstract method __snapshot_assert_no_blockers in
 QemuConfig
* renamed non_migr_res to blockers and non_migratable_resources

 PVE/API2/Qemu.pm   |  5 ++++-
 PVE/QemuConfig.pm  |  5 +++++
 PVE/QemuMigrate.pm |  2 +-
 PVE/QemuServer.pm  | 23 ++++++++++++++++++++++-
 4 files changed, 32 insertions(+), 3 deletions(-)

diff --git a/PVE/API2/Qemu.pm b/PVE/API2/Qemu.pm
index 848001b6..d16b8baa 100644
--- a/PVE/API2/Qemu.pm
+++ b/PVE/API2/Qemu.pm
@@ -4531,7 +4531,7 @@ __PACKAGE__->register_method({
 	$res->{running} = PVE::QemuServer::check_running($vmid) ? 1:0;
 
 	my ($local_resources, $mapped_resources, $missing_mappings_by_node) =
-	    PVE::QemuServer::check_local_resources($vmconf, 1);
+	    PVE::QemuServer::check_local_resources($vmconf, $res->{running}, 1);
 	delete $missing_mappings_by_node->{$localnode};
 
 	my $vga = PVE::QemuServer::parse_vga($vmconf->{vga});
@@ -5219,6 +5219,9 @@ __PACKAGE__->register_method({
 	die "unable to use snapshot name 'pending' (reserved name)\n"
 	    if lc($snapname) eq 'pending';
 
+	my $vmconf = PVE::QemuConfig->load_config($vmid);
+	PVE::QemuServer::check_non_migratable_resources($vmconf, $param->{vmstate}, 0);
+
 	my $realcmd = sub {
 	    PVE::Cluster::log_msg('info', $authuser, "snapshot VM $vmid: $snapname");
 	    PVE::QemuConfig->snapshot_create($vmid, $snapname, $param->{vmstate},
diff --git a/PVE/QemuConfig.pm b/PVE/QemuConfig.pm
index 8e8a7828..ffdf9f03 100644
--- a/PVE/QemuConfig.pm
+++ b/PVE/QemuConfig.pm
@@ -199,6 +199,11 @@ sub get_backup_volumes {
     return $return_volumes;
 }
 
+sub __snapshot_assert_no_blockers {
+    my ($class, $vmconf, $save_vmstate) = @_;
+    PVE::QemuServer::check_non_migratable_resources($vmconf, $save_vmstate, 0);
+}
+
 sub __snapshot_save_vmstate {
     my ($class, $vmid, $conf, $snapname, $storecfg, $statestorage, $suspend) = @_;
 
diff --git a/PVE/QemuMigrate.pm b/PVE/QemuMigrate.pm
index 6591f3f7..09e97268 100644
--- a/PVE/QemuMigrate.pm
+++ b/PVE/QemuMigrate.pm
@@ -233,7 +233,7 @@ sub prepare {
 	$self->{vm_was_paused} = 1 if PVE::QemuServer::vm_is_paused($vmid, 0);
     }
 
-    my ($loc_res, $mapped_res, $missing_mappings_by_node) = PVE::QemuServer::check_local_resources($conf, 1);
+    my ($loc_res, $mapped_res, $missing_mappings_by_node) = PVE::QemuServer::check_local_resources($conf, $running, 1);
     my $blocking_resources = [];
     for my $res ($loc_res->@*) {
 	if (!grep($res, $mapped_res->@*)) {
diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index dd6ae93f..e94f6d0d 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -2563,13 +2563,32 @@ sub config_list {
     return $res;
 }
 
+sub check_non_migratable_resources {
+    my ($conf, $state, $noerr) = @_;
+
+    my @blockers = ();
+    if ($state && $conf->{amd_sev}) {
+	push @blockers, "amd_sev";
+    }
+
+    if (scalar(@blockers) && !$noerr) {
+	die "Cannot live-migrate, snapshot (with RAM), or hibernate a VM with:"
+	    ." @blockers\n";
+    }
+
+    return @blockers;
+}
+
 # test if VM uses local resources (to prevent migration)
 sub check_local_resources {
-    my ($conf, $noerr) = @_;
+    my ($conf, $state, $noerr) = @_;
 
     my @loc_res = ();
     my $mapped_res = [];
 
+    my @non_migratable_resources = check_non_migratable_resources($conf, $state, $noerr);
+    push(@loc_res, @non_migratable_resources);
+
     my $nodelist = PVE::Cluster::get_nodelist();
     my $pci_map = PVE::Mapping::PCI::config();
     my $usb_map = PVE::Mapping::USB::config();
@@ -6445,6 +6464,8 @@ sub vm_suspend {
 	die "cannot suspend to disk during backup\n"
 	    if $is_backing_up && $includestate;
 
+	check_non_migratable_resources($conf, $includestate, 0);
+
 	if ($includestate) {
 	    $conf->{lock} = 'suspending';
 	    my $date = strftime("%Y-%m-%d", localtime(time()));
-- 
2.39.5