Re: [Qemu-devel] [kvm-s390] qemu-system-s390x: cannot use stdio by multiple character devices

[tu bo <tubo@linux.vnet.ibm.com>]

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Hi Alex:

Ping you again just in case you did not get my mail  :-)

On 08/13/2015 03:52 PM, tu bo wrote:
> Hi Alex:
>
> I added one disk device for test case 068(qemu/tests/qemu-iotests/068, 
> which is for for loading a saved VM state from a qcow2 image ),
> and got the same problem for s390-virtio-ccw.  Below is my steps:
> 1. qemu-img create -f qcow2 scratch/t.qcow2 64M
> 2. [root@r17lp42 qemu-iotests]# ../../s390x-softmmu/qemu-system-s390x 
> -nodefaults -nographic -monitor stdio -serial none  -hda scratch/t.qcow2
> QEMU 2.3.94 monitor - type 'help' for more information
> (qemu) [root@r17lp42 qemu-iotests]#
>
> For s390-virtio,  test result is as expected
> 1. qemu-img create -f qcow2 scratch/t.qcow2 64M
> 2. [root@r17lp42 qemu-iotests]# qemu-system-s390x -nodefaults 
> -nographic -monitor stdio -serial none  -hda scratch/t.qcow2
> QEMU 2.3.50 monitor - type 'help' for more information
> (qemu) info roms
> addr=0000000000009000 size=0x000ce8 mem=ram 
> name="/usr/share/qemu/s390-zipl.rom"
> (qemu) savevm 0
> (qemu)
> (qemu) quit
> 3.[root@r17lp42 qemu-iotests]# qemu-system-s390x -nodefaults 
> -nographic -monitor stdio -serial none  -hda scratch/t.qcow2 -loadvm 0
> QEMU 2.3.50 monitor - type 'help' for more information
> (qemu)
>
> For x86-64, test result is as expected,
> 1. [gavin@oc6333346435 qemu-iotests]$ qemu-img create -f qcow2 
> scratch/t.qcow2 64M
> 2. [gavin@oc6333346435 qemu-iotests]$ 
> ../../x86_64-softmmu/qemu-system-x86_64 -nodefaults -nographic 
> -monitor stdio -serial none  -hda scratch/t.qcow2
> QEMU 2.3.94 monitor - type 'help' for more information
> (qemu) info roms
> fw=genroms/kvmvapic.bin size=0x002400 name="kvmvapic.bin"
> addr=00000000fffc0000 size=0x040000 mem=rom name="bios-256k.bin"
> /rom@etc/acpi/tables size=0x200000 name="etc/acpi/tables"
> /rom@etc/table-loader size=0x001000 name="etc/table-loader"
> /rom@etc/acpi/rsdp size=0x000024 name="etc/acpi/rsdp"
> (qemu) savevm 0
> (qemu)
> 3. [gavin@oc6333346435 qemu-iotests]$ 
> ../../x86_64-softmmu/qemu-system-x86_64 -nodefaults -nographic 
> -monitor stdio -serial none  -hda scratch/t.qcow2 -loadvm 0
> QEMU 2.3.94 monitor - type 'help' for more information
> (qemu)
>
> Could you share me why s390-virtio-ccw has different behavior with 
> s390-virtio & x86_64 for this scenario?  thanks
>
>
> On 08/10/2015 03:51 PM, Alexander Graf wrote:
>>
>>
>> Am 10.08.2015 um 09:15 schrieb tu bo <tubo@linux.vnet.ibm.com 
>> <mailto:tubo@linux.vnet.ibm.com>>:
>>
>>> Dear  Alexander,  Mimu:
>>>
>>> Failure of test case 068 for s390x is caused by the commit of 
>>> "/1f68f1d36c3af09ed31a529ad69c3d09880d10fd//"
>>> //Author: Alexander Graf <agraf@suse.de>//
>>> //Date:   Tue Jun 16 23:06:33 2015 +0200//
>>> //
>>> //    s390x: Switch to s390-ccw machine as default//
>>>
>>> @@ -216,6 +216,7 @@ static void ccw_machine_class_init(ObjectClass 
>>> *oc, void *data)
>>>      mc->no_sdcard = 1;
>>>      mc->use_sclp = 1;
>>>      mc->max_cpus = 255;
>>> *+    mc->is_default = 1;*
>>>      nc->nmi_monitor_handler = s390_nmi;
>>>  }
>>>
>>> @@ -345,7 +345,6 @@ static void s390_machine_class_init(ObjectClass 
>>> *oc, void *data)
>>>      mc->no_floppy = 1;
>>>      mc->no_cdrom = 1;
>>>      mc->no_sdcard = 1;
>>> *-    mc->is_default = 1;*
>>>      nc->nmi_monitor_handler = s390_nmi;
>>>  }
>>>
>>> /Without this commit,   s390-virtio is default machine and default 
>>> ipl device is *s390-zipl.rom*
>>> [root@r17lp42 qemu]#  s390x-softmmu/qemu-system-s390x -nodefaults 
>>> -nographic -monitor stdio -serial none
>>> QEMU 2.3.94 monitor - type 'help' for more information
>>> (qemu) info cpus
>>> * CPU #0: thread_id=39761
>>> (qemu) info roms
>>> addr=0000000000009000 size=0x000ce8 mem=ram name="pc-bios/s390-zipl.rom"
>>>
>>> With this commit,  s390-virtio-ccw is default machine and default 
>>> ipl device is *s390-ccw.img*, When running
>>> "s390x-softmmu/qemu-system-s390x -nodefaults -nographic -monitor 
>>> stdio -serial none -machine accel=kvm" ,  the cpu status is
>>> *halted* which causes the failure of test case 068.
>>> [root@r17lp42 qemu]# s390x-softmmu/qemu-system-s390x -nodefaults 
>>> -nographic -monitor stdio -serial none -machine accel=kvm
>>> QEMU 2.3.94 monitor - type 'help' for more information
>>> (qemu) info cpus
>>> * CPU #0: *(halted)* thread_id=39746
>>> (qemu) info roms
>>> addr=0000000007e00000 size=0x002dd0 mem=ram name="phdr #2: 
>>> /disks/bo.home/vs1403/qemu/pc-bios/s390-ccw.img"
>>> addr=0000000007e03f00 size=0x01d100 mem=ram name="phdr #3: 
>>> /disks/bo.home/vs1403/qemu/pc-bios/s390-ccw.img"
>>>
>>> With this commit,  when running "s390x-softmmu/qemu-system-s390x 
>>> -nodefaults -nographic -monitor stdio -serial none", then qemu will 
>>> exit as below,
>>> [root@r17lp42 qemu]#  s390x-softmmu/qemu-system-s390x -nodefaults 
>>> -nographic -monitor stdio -serial none
>>> QEMU 2.3.94 monitor - type 'help' for more information
>>> (qemu) [root@r17lp42 qemu]#
>>>
>>> Is this the expected behavior of s390-virtio-ccw and s390-ccw.img?  
>>> thanks
>>
>> Yes, the ccw machine finds no device to load from and errors out, 
>> exiting thr vm. The s390-virtio boot loader wasn't smart enough for 
>> that and just hung iirc.
>>
>>
>> Alex
>>
>


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