qemu option parsing error.

qemu option parsing error.

[John Clemens]

It appears the qemu in KVM-51 has a weird glitch where it will ignore
the '-m' memory parameter if it's the first parameter on the command
line (the case 'QEMU_OPTION_m' stanza never gets called in
qemu/hw/vl.c:main()).  A quick look at the code doesn't reveal anything
obvious to me as to why.  Putting some other parameter first (like
'-hda') works just fine.  This doesn't happen with the current qemu
cvs. 

i.e.:

qemu-system-x86_64 -m 512 -hda test.img  == 128MB ram in VM.
qemu-system-x86_64 -hda test.img -m 512  == 512MB ram in VM.

john.c


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Re: qemu option parsing error.

[Dan Kenigsberg]

On Sat, Nov 10, 2007 at 01:22:06PM -0500, John Clemens wrote:
> It appears the qemu in KVM-51 has a weird glitch where it will ignore
> the '-m' memory parameter if it's the first parameter on the command
> line (the case 'QEMU_OPTION_m' stanza never gets called in
> qemu/hw/vl.c:main()).  A quick look at the code doesn't reveal anything
> obvious to me as to why.  Putting some other parameter first (like
> '-hda') works just fine.  This doesn't happen with the current qemu
> cvs. 
> 
> i.e.:
> 
> qemu-system-x86_64 -m 512 -hda test.img  == 128MB ram in VM.
> qemu-system-x86_64 -hda test.img -m 512  == 512MB ram in VM.
> 

I failed to reproduce this on my system (but I could not try if with the
exact same params). What's your host? What happens when you pass an
absurdly large memory size?

I get
$ ./qemu-system-x86_64 -m 4000 -hda /images/fc6.img
kvm_alloc_userspace_memory: Cannot allocate memoryCould not create KVM context

Dan.

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Re: qemu option parsing error.

[John Clemens]

Aww..crap.

Please disregard.. I was running under 'vdeq', and it looks like vdeq is
eating the '-m' argument for itself iff it's the first argument on the
qemu command line. 

As you can see, when running under vdeq (and some extra debugging
printf's added):

$ sudo vdeq ./qemu-system-x86_64 -m 512 test.img
ram_size=134217728
phys_ram_size=146812928

$ sudo vdeq ./qemu-system-x86_64 test.img -m 512
ram_size=536870912
phys_ram_size=549466112

Without vdeq, everything runs fine. Sorry for the noise...
john.c

On Sun, 2007-11-11 at 00:30 +0200, Dan Kenigsberg wrote:
> On Sat, Nov 10, 2007 at 01:22:06PM -0500, John Clemens wrote:
> > It appears the qemu in KVM-51 has a weird glitch where it will ignore
> > the '-m' memory parameter if it's the first parameter on the command
> > line (the case 'QEMU_OPTION_m' stanza never gets called in
> > qemu/hw/vl.c:main()).  A quick look at the code doesn't reveal anything
> > obvious to me as to why.  Putting some other parameter first (like
> > '-hda') works just fine.  This doesn't happen with the current qemu
> > cvs. 
> > 
> > i.e.:
> > 
> > qemu-system-x86_64 -m 512 -hda test.img  == 128MB ram in VM.
> > qemu-system-x86_64 -hda test.img -m 512  == 512MB ram in VM.
> > 
> 
> I failed to reproduce this on my system (but I could not try if with the
> exact same params). What's your host? What happens when you pass an
> absurdly large memory size?
> 
> I get
> $ ./qemu-system-x86_64 -m 4000 -hda /images/fc6.img
> kvm_alloc_userspace_memory: Cannot allocate memoryCould not create KVM context
> 
> Dan.


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