[pve-devel] qemu start hanging on dell r710

Alexandre DERUMIER aderumier at odiso.com
Tue Sep 29 13:46:06 CEST 2015


rollbacking to kernel 4.1 seem to work too.


so it's only with kvm + kernel 4.2 + qemu 2.4 machine type

looking at the machine config code, 
it could come from KVM_CAP_X86_SMM extension

on 2.3 machinetype, the value is forced and on 2.4 they are some kind of test.


static void pc_compat_2_3(MachineState *machine)
{
    PCMachineState *pcms = PC_MACHINE(machine);
    savevm_skip_section_footers();
    if (kvm_enabled()) {
        pcms->smm = ON_OFF_AUTO_OFF;   >> comment this, and it's hanging too
    }
    global_state_set_optional();
    savevm_skip_configuration();
}




bool pc_machine_is_smm_enabled(PCMachineState *pcms)
{
    bool smm_available = false;

    if (pcms->smm == ON_OFF_AUTO_OFF) {
        return false;
    }

    if (tcg_enabled() || qtest_enabled()) {
        smm_available = true;
    } else if (kvm_enabled()) {
        smm_available = kvm_has_smm();   >> maybe it's hanging here
    }

    if (smm_available) {
        return true;
    }

    if (pcms->smm == ON_OFF_AUTO_ON) {
        error_report("System Management Mode not supported by this hypervisor.");
        exit(1);
    }
    return false;
}



bool kvm_has_smm(void)
{
    return kvm_check_extension(kvm_state, KVM_CAP_X86_SMM);
}


I'll send a mail to qemu && kvm mailing list

----- Mail original -----
De: "aderumier" <aderumier at odiso.com>
À: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Mardi 29 Septembre 2015 12:46:54
Objet: Re: [pve-devel] qemu start hanging on dell r710

disabling kvm also fix the problem. 


hanging: 
/usr/bin/kvm -id 100 -chardev socket,id=qmp,path=/var/run/qemu-server/100.qmp,server,nowait -mon chardev=qmp,mode=control -vnc unix:/var/run/qemu-server/100.vnc,x509,password -pidfile /var/run/qemu-server/100.pid -name test -cpu kvm64 -m 4096 -machine pc-i440fx-2.4 


working: 
/usr/bin/kvm -id 100 -chardev socket,id=qmp,path=/var/run/qemu-server/100.qmp,server,nowait -mon chardev=qmp,mode=control -vnc unix:/var/run/qemu-server/100.vnc,x509,password -pidfile /var/run/qemu-server/100.pid -name test -cpu kvm64 -m 4096 -machine accel=tcg,type=pc-i440fx-2.4 


working: 
/usr/bin/kvm -id 100 -chardev socket,id=qmp,path=/var/run/qemu-server/100.qmp,server,nowait -mon chardev=qmp,mode=control -vnc unix:/var/run/qemu-server/100.vnc,x509,password -pidfile /var/run/qemu-server/100.pid -name test -cpu kvm64 -m 4096 -machine pc-i440fx-2.3 



----- Mail original ----- 
De: "aderumier" <aderumier at odiso.com> 
À: "pve-devel" <pve-devel at pve.proxmox.com> 
Envoyé: Mardi 29 Septembre 2015 12:35:46 
Objet: Re: [pve-devel] qemu start hanging on dell r710 

Can someone tell me how to debug with qemu dbg package ? 


----- Mail original ----- 
De: "aderumier" <aderumier at odiso.com> 
À: "pve-devel" <pve-devel at pve.proxmox.com> 
Envoyé: Mardi 29 Septembre 2015 12:20:02 
Objet: Re: [pve-devel] qemu start hanging on dell r710 

Ok, It seem to be a qemu bug. 

setting 

machine: pc-i440fx-2.3 

is working for me 

I'm seeing a similar bug report here: 
https://lacyc3.eu/qemu-guest-has-not-initialized-the-display 



----- Mail original ----- 
De: "aderumier" <aderumier at odiso.com> 
À: "pve-devel" <pve-devel at pve.proxmox.com> 
Envoyé: Mardi 29 Septembre 2015 11:50:33 
Objet: [pve-devel] qemu start hanging on dell r710 

Hi, 

users reported qemu problem since beta2 with some hardware 

http://forum.proxmox.com/threads/23548-PVE-4-0-Beta2-qemu-acpi 


I'm finally able to reproduce it with a clean beta2 install on dell r710. 

the qemu process start, but freeze and vnc is not working. 


reverting to pve-qemu-kvm 2.3-6 is working, pve-qemu-kvm 2.3-8 (qemu 2.4rc) is already hanging. 


(I can't reproduce this bug on dell r730 and old dell poweredge 2950) 

I don't known yet if it's a qemu 2.4 bug, or proxmox patch bug. 

I'll try to build a clean qemu 2.4 without patches to see if it's help. 




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