Re: [pve-devel] [PATCH qemu-server] fix #2788: do not resume vms after backup if they were paused before

[Dominik Csapak <d.csapak@proxmox.com>]

On 1/20/21 11:54 AM, Fabian Ebner wrote:
> Works for snapshot mode, but with suspend mode it still resumes the VM 
> afterwards. For stop mode, we error out before stopping the VM. Should 
> we error out before suspending too or can we somehow go back from 
> suspended to paused?
> 

thanks, i missed that...

for vms, paused == suspended (not to disk), so that should be no 
problem, i'll send a v2 later today

> On 20.01.21 11:07, Dominik Csapak wrote:
>> by checking if the vm is paused at the beginning and skipping the resume
>> now we also skip the qga freeze/thaw (which cannot work if the vm is
>> paused)
>>
>> moved the 'vm_is_paused' sub from the api to PVE/QemuServer.pm so it is
>> available everywhere we need it.
>>
>> Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
>> ---
>>   PVE/API2/Qemu.pm         | 14 ++------------
>>   PVE/QemuServer.pm        | 10 ++++++++++
>>   PVE/VZDump/QemuServer.pm |  7 +++++--
>>   3 files changed, 17 insertions(+), 14 deletions(-)
>>
>> diff --git a/PVE/API2/Qemu.pm b/PVE/API2/Qemu.pm
>> index e2d2d67..623c998 100644
>> --- a/PVE/API2/Qemu.pm
>> +++ b/PVE/API2/Qemu.pm
>> @@ -2402,16 +2402,6 @@ __PACKAGE__->register_method({
>>       return $rpcenv->fork_worker('qmreset', $vmid, $authuser, $realcmd);
>>       }});
>> -my sub vm_is_paused {
>> -    my ($vmid) = @_;
>> -    my $qmpstatus = eval {
>> -    PVE::QemuConfig::assert_config_exists_on_node($vmid);
>> -    mon_cmd($vmid, "query-status");
>> -    };
>> -    warn "$@\n" if $@;
>> -    return $qmpstatus && $qmpstatus->{status} eq "paused";
>> -}
>> -
>>   __PACKAGE__->register_method({
>>       name => 'vm_shutdown',
>>       path => '{vmid}/status/shutdown',
>> @@ -2480,7 +2470,7 @@ __PACKAGE__->register_method({
>>       #
>>       # checking the qmp status here to get feedback to the gui/cli/api
>>       # and the status query should not take too long
>> -    if (vm_is_paused($vmid)) {
>> +    if (PVE::QemuServer::vm_is_paused($vmid)) {
>>           if ($param->{forceStop}) {
>>           warn "VM is paused - stop instead of shutdown\n";
>>           $shutdown = 0;
>> @@ -2556,7 +2546,7 @@ __PACKAGE__->register_method({
>>       my $node = extract_param($param, 'node');
>>       my $vmid = extract_param($param, 'vmid');
>> -    die "VM is paused - cannot shutdown\n" if vm_is_paused($vmid);
>> +    die "VM is paused - cannot shutdown\n" if 
>> PVE::QemuServer::vm_is_paused($vmid);
>>       die "VM $vmid not running\n" if 
>> !PVE::QemuServer::check_running($vmid);
>> diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
>> index 54278e5..d7ee05f 100644
>> --- a/PVE/QemuServer.pm
>> +++ b/PVE/QemuServer.pm
>> @@ -7382,4 +7382,14 @@ sub complete_migration_storage {
>>       return $res;
>>   }
>> +sub vm_is_paused {
>> +    my ($vmid) = @_;
>> +    my $qmpstatus = eval {
>> +    PVE::QemuConfig::assert_config_exists_on_node($vmid);
>> +    mon_cmd($vmid, "query-status");
>> +    };
>> +    warn "$@\n" if $@;
>> +    return $qmpstatus && $qmpstatus->{status} eq "paused";
>> +}
>> +
>>   1;
>> diff --git a/PVE/VZDump/QemuServer.pm b/PVE/VZDump/QemuServer.pm
>> index b322701..c62142d 100644
>> --- a/PVE/VZDump/QemuServer.pm
>> +++ b/PVE/VZDump/QemuServer.pm
>> @@ -62,8 +62,11 @@ sub prepare {
>>       if defined($conf->{name});
>>       $self->{vm_was_running} = 1;
>> +    $self->{vm_was_paused} = 0;
>>       if (!PVE::QemuServer::check_running($vmid)) {
>>       $self->{vm_was_running} = 0;
>> +    } elsif (PVE::QemuServer::vm_is_paused($vmid)) {
>> +    $self->{vm_was_paused} = 1;
>>       }
>>       $task->{hostname} = $conf->{name};
>> @@ -794,7 +797,7 @@ sub _get_task_devlist {
>>   sub qga_fs_freeze {
>>       my ($self, $task, $vmid) = @_;
>> -    return if !$self->{vmlist}->{$vmid}->{agent} || $task->{mode} eq 
>> 'stop' || !$self->{vm_was_running};
>> +    return if !$self->{vmlist}->{$vmid}->{agent} || $task->{mode} eq 
>> 'stop' || !$self->{vm_was_running} || $self->{vm_was_paused};
>>       if (!PVE::QemuServer::qga_check_running($vmid, 1)) {
>>       $self->loginfo("skipping guest-agent 'fs-freeze', agent 
>> configured but not running?");
>> @@ -872,7 +875,7 @@ sub register_qmeventd_handle {
>>   sub resume_vm_after_job_start {
>>       my ($self, $task, $vmid) = @_;
>> -    return if !$self->{vm_was_running};
>> +    return if !$self->{vm_was_running} || $self->{vm_was_paused};
>>       if (my $stoptime = $task->{vmstoptime}) {
>>       my $delay = time() - $task->{vmstoptime};
>>