qemu discuss - Sep 2006 - kqemu only working for one virtual machine at a time?

I installed qemu and kqemu from the OpenSolaris project page on my Ferrari
running snv_46 with the xen bfu from 8/2006.

Questions until now:

1. Looks like qemu (with and without kqemu) does not work with Xen (I asked this
question already in other xen/qemu related forums but did not get an definitive
answer yet)

2. I can only start one machine with kqemu enabled; starting another virtual
machine while the first virtual machine is still running results in the error
message:

(bash):root at ferrari:/opt/kqemu-osol-1.3.0pre9 # Error -1 while initializing
QEMU acceleration layer - disabling it for now

I''m not sure if this is a general limitation of the kqemu module (( did
not find anything about this on the kqemu homepage); a limitation of the Solaris
version of the kqemu module, or a limitation from my environment (snv_46 and xen
bfu)

regards

Bernd
--
This message posted from opensolaris.org

> 2. I can only start one machine with kqemu enabled;
> starting another virtual machine while the first
> virtual machine is still running results in the error
> message:
> 
> (bash):root at ferrari:/opt/kqemu-osol-1.3.0pre9 # Error
> -1 while initializing QEMU acceleration layer -
> disabling it for now
>                                      
> I''m not sure if this is a general
> limitation of the kqemu module (( did not find
> anything about this on the kqemu homepage); a
> limitation of the Solaris version of the kqemu
> module, or a limitation from my environment (snv_46
> and xen bfu)
The same happens on snv_49 without xen.

Apparently a limitation of the solaris kqemu kernel
module.  We have exactly one instance of the kqemu
device, an if that instance already has an active
"kqemu_instance->state" attached, another attempt
to init kqemu fails with an EIO error:

kqemu_ioctl()
{
...
        s = ks->state;

        switch(cmd) {
        case KQEMU_INIT:
        {
                struct kqemu_init d;
                if (s != NULL) {
                        error = EIO;
                        break;
                }
...


Maybe the Solaris kqemu module should implement some
sort of "clone open" in kqemu_open(), so that multiple
processes can open it and each process gets a different
kqemu instance?
--
This message posted from opensolaris.org

> Maybe the Solaris kqemu module should implement some
> sort of "clone open" in kqemu_open(), so that multiple
> processes can open it and each process gets a different
> kqemu instance?
Correct, this is on the list of RFEs on the SketchPad, in fact.

http://www.genunix.org/wiki/index.php/OpenSolaris_QEMU_SketchPad

- Eric

Eric Lowe wrote:
>> Maybe the Solaris kqemu module should implement some
>> sort of "clone open" in kqemu_open(), so that multiple
>> processes can open it and each process gets a different
>> kqemu instance?
> 
> Correct, this is on the list of RFEs on the SketchPad, in fact.
I have added clone open() support and uploaded a version 0.2 of the 
kqemu accelerator to the downloads page.

- Eric