libvirt users - Sep 2013 - Re: [libvirt] virDomainGetInfo() returns wrong domain state

Hi Team,
I have written below code to get the VM state at run time. I found, though the
VM is in shut-off state, when I use the function virDomainGetInfo();  I get
state as running. Could you please let me know what wrong I am doing. To know
the actual VM state I used 'virsh list' and it clearly shows the VM is
in shut-off state. Please find the log and code snippet below.

Log from virsh:
================[host:~]$ virsh list  --all
Id    Name                           State
----------------------------------------------------
1     calvados                       running
2     LCXR                           running
3     default-sdr--1                 running
-     test--2                        shut off

Out put:
========04.03.06.698923264:INFO: vm_libvirt_state_to_vmm_state: state returned
is 1

Note : Here 1 is actually running.

Code snippet:
==============enum cidl_vmm_vm_state
vm_libvirt_state_to_vmm_state(unsigned char libvirt_state)
{
    enum cidl_vmm_vm_state state;
    INFO("%s: state returned is %u\n",__FUNCTION__, libvirt_state);
<<<<<<<<<<<<<<<<<<
    if (libvirt_state == VIR_DOMAIN_RUNNING) {
        state = cidl_vm_state_running;
    } else if ((libvirt_state == VIR_DOMAIN_PAUSED) ||
               (libvirt_state == VIR_DOMAIN_BLOCKED)) {
        state = cidl_vm_state_paused;
    } else if (libvirt_state == VIR_DOMAIN_SHUTOFF) {
        state = cidl_vm_state_defined;
    } else {
        state = cidl_vm_state_not_defined;
    }
    return state;
}

           virDomainInfo res_util;
            virDomainPtr dom = virDomainLookupByName(virt,
                                                     private_names[vm_idx]);
            res = virDomainGetInfo(dom, &res_util);
            vminfo[vm_idx].vm_state                  
vm_libvirt_state_to_vmm_state(res_util.state);



Regards
Ritesh Sharma

On 24.09.2013 16:51, Panday Ritesh Sharma (rpanday)
wrote:
>  
> 
> Hi Team,
> 
> I have written below code to get the VM state at run time. I found,
> though the VM is in shut-off state, when I use the function
> virDomainGetInfo();  I get state as running. Could you please let me
> know what wrong I am doing. To know the actual VM state I used ‘virsh
> list’ and it clearly shows the VM is in shut-off state. Please find the
> log and code snippet below.
> 
>  
> 
> Log from virsh:
> 
> ================> 
> [host:~]$ virsh list  --all
> 
> Id    Name                           State
> 
> ----------------------------------------------------
> 
> 1     calvados                       running
> 
> 2     LCXR                           running
> 
> 3     default-sdr--1                 running
> 
> -     test--2                        shut off
> 
>  
> 
> Out put:
> 
> ========> 
> 04.03.06.698923264:INFO: vm_libvirt_state_to_vmm_state: state returned is 1
> 
>  
> 
> Note : Here 1 is actually running.
> 
>  
> 
> Code snippet:
> 
> ==============> 
> enum cidl_vmm_vm_state
> 
> vm_libvirt_state_to_vmm_state(unsigned char libvirt_state)
> 
> {
> 
>     enum cidl_vmm_vm_state state;
> 
>     INFO("%s: state returned is %u\n",__FUNCTION__,
libvirt_state);
> <<<<<<<<<<<<<<<<<<
> 
>     if (libvirt_state == VIR_DOMAIN_RUNNING) {
> 
>         state = cidl_vm_state_running;
> 
>     } else if ((libvirt_state == VIR_DOMAIN_PAUSED) ||
> 
>                (libvirt_state == VIR_DOMAIN_BLOCKED)) {
> 
>         state = cidl_vm_state_paused;
> 
>     } else if (libvirt_state == VIR_DOMAIN_SHUTOFF) {
> 
>         state = cidl_vm_state_defined;
> 
>     } else {
> 
>         state = cidl_vm_state_not_defined;
> 
>     }
> 
>     return state;
> 
> }
While this part ^^^ looks okay, the part below looks suspicious. I mean
not from API perspective, but from data perspective.
> 
>  
> 
>            virDomainInfo res_util;
> 
>             virDomainPtr dom = virDomainLookupByName(virt,
> 
>                                                     
private_names[vm_idx]);
Are you sure you're passing the correct name here? That's the only
possible source of the error here.
> 
>             res = virDomainGetInfo(dom, &res_util);
> 
>             vminfo[vm_idx].vm_state > 
>                   vm_libvirt_state_to_vmm_state(res_util.state);
> 
>  
Michal

Yes, I am sure because other information pulled are correct. And the same way we
have used libvirt APIs to extract other informations at different places.

My question is if VM is in shut-off state does it mean running ? IF not, what is
the correct state for this VM. I am wondering why the state is 'unsigned
char' in virDomainGetInfo, why it could not be 'enum'  as it is
returning enums only.



Regards
Ritesh Sharma

-----Original Message-----
From: Michal Privoznik [mailto:mprivozn@redhat.com] 
Sent: Thursday, September 26, 2013 12:54 PM
To: Panday Ritesh Sharma (rpanday)
Cc: libvir-list@redhat.com; libvirt-users@redhat.com; Vinay Shankarkumar
(vinays); q-se-dev(mailer list); Basavaraj Bendigeri (bbendige)
Subject: Re: [libvirt] virDomainGetInfo() returns wrong domain state

On 24.09.2013 16:51, Panday Ritesh Sharma (rpanday)
wrote:
>  
> 
> Hi Team,
> 
> I have written below code to get the VM state at run time. I found, 
> though the VM is in shut-off state, when I use the function 
> virDomainGetInfo();  I get state as running. Could you please let me 
> know what wrong I am doing. To know the actual VM state I used 'virsh 
> list' and it clearly shows the VM is in shut-off state. Please find 
> the log and code snippet below.
> 
>  
> 
> Log from virsh:
> 
> ================> 
> [host:~]$ virsh list  --all
> 
> Id    Name                           State
> 
> ----------------------------------------------------
> 
> 1     calvados                       running
> 
> 2     LCXR                           running
> 
> 3     default-sdr--1                 running
> 
> -     test--2                        shut off
> 
>  
> 
> Out put:
> 
> ========> 
> 04.03.06.698923264:INFO: vm_libvirt_state_to_vmm_state: state returned 
> is 1
> 
>  
> 
> Note : Here 1 is actually running.
> 
>  
> 
> Code snippet:
> 
> ==============> 
> enum cidl_vmm_vm_state
> 
> vm_libvirt_state_to_vmm_state(unsigned char libvirt_state)
> 
> {
> 
>     enum cidl_vmm_vm_state state;
> 
>     INFO("%s: state returned is %u\n",__FUNCTION__,
libvirt_state);
> <<<<<<<<<<<<<<<<<<
> 
>     if (libvirt_state == VIR_DOMAIN_RUNNING) {
> 
>         state = cidl_vm_state_running;
> 
>     } else if ((libvirt_state == VIR_DOMAIN_PAUSED) ||
> 
>                (libvirt_state == VIR_DOMAIN_BLOCKED)) {
> 
>         state = cidl_vm_state_paused;
> 
>     } else if (libvirt_state == VIR_DOMAIN_SHUTOFF) {
> 
>         state = cidl_vm_state_defined;
> 
>     } else {
> 
>         state = cidl_vm_state_not_defined;
> 
>     }
> 
>     return state;
> 
> }
While this part ^^^ looks okay, the part below looks suspicious. I mean not from
API perspective, but from data perspective.
> 
>  
> 
>            virDomainInfo res_util;
> 
>             virDomainPtr dom = virDomainLookupByName(virt,
> 
>                                                      
> private_names[vm_idx]);
Are you sure you're passing the correct name here? That's the only
possible source of the error here.
> 
>             res = virDomainGetInfo(dom, &res_util);
> 
>             vminfo[vm_idx].vm_state > 
>                   vm_libvirt_state_to_vmm_state(res_util.state);
> 
>  
Michal