[Qemu-devel] [Bug 1707297] [NEW] qemu became more picky parsing -m option

[Qemu-devel] [Bug 1707297] [NEW] qemu became more picky parsing -m option

[John Florian]

Public bug reported:

With qemu-kvm-2.9.0-3.fc26.x86_64 I am no longer to specify the memory
size using something like "-m 1.00000GiB" but with qemu-
kvm-2.7.1-7.fc25.x86_64 I could without any problem.  I now get an error
message like:

qemu-system-x86_64: -m 1.00000GiB: Parameter 'size' expects a non-negative number below 2^64
Optional suffix k, M, G, T, P or E means kilo-, mega-, giga-, tera-, peta-
and exabytes, respectively.


Is this expected or a regression?

** Affects: qemu
     Importance: Undecided
         Status: New

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Title:
  qemu became more picky parsing -m option

Status in QEMU:
  New

Bug description:
  With qemu-kvm-2.9.0-3.fc26.x86_64 I am no longer to specify the memory
  size using something like "-m 1.00000GiB" but with qemu-
  kvm-2.7.1-7.fc25.x86_64 I could without any problem.  I now get an
  error message like:

  qemu-system-x86_64: -m 1.00000GiB: Parameter 'size' expects a non-negative number below 2^64
  Optional suffix k, M, G, T, P or E means kilo-, mega-, giga-, tera-, peta-
  and exabytes, respectively.

  
  Is this expected or a regression?

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Re: [Qemu-devel] [Bug 1707297] [NEW] qemu became more picky parsing -m option

[Markus Armbruster]

John Florian <1707297@bugs.launchpad.net> writes:

> Public bug reported:
>
> With qemu-kvm-2.9.0-3.fc26.x86_64 I am no longer to specify the memory
> size using something like "-m 1.00000GiB" but with qemu-
> kvm-2.7.1-7.fc25.x86_64 I could without any problem.  I now get an error
> message like:
>
> qemu-system-x86_64: -m 1.00000GiB: Parameter 'size' expects a non-negative number below 2^64
> Optional suffix k, M, G, T, P or E means kilo-, mega-, giga-, tera-, peta-
> and exabytes, respectively.
>
>
> Is this expected or a regression?

We recognize suffix "G".  Before commit 75cdcd1 (v2.9.0), trailing
garbage after a recognized suffix was silently ignored.  "1.0G",
"1.0GiB", "1.0Garbage-trucks-of-RAM" were all the same to QEMU.  No
more.

All clear?

Re: [Qemu-devel] [Bug 1707297] [NEW] qemu became more picky parsing -m option

[Eric Blake]

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On 07/31/2017 03:34 AM, Markus Armbruster wrote:
> John Florian <1707297@bugs.launchpad.net> writes:
> 
>> Public bug reported:
>>
>> With qemu-kvm-2.9.0-3.fc26.x86_64 I am no longer to specify the memory
>> size using something like "-m 1.00000GiB" but with qemu-
>> kvm-2.7.1-7.fc25.x86_64 I could without any problem.  I now get an error
>> message like:
>>
>> qemu-system-x86_64: -m 1.00000GiB: Parameter 'size' expects a non-negative number below 2^64
>> Optional suffix k, M, G, T, P or E means kilo-, mega-, giga-, tera-, peta-
>> and exabytes, respectively.
>>
>>
>> Is this expected or a regression?
> 
> We recognize suffix "G".  Before commit 75cdcd1 (v2.9.0), trailing
> garbage after a recognized suffix was silently ignored.  "1.0G",
> "1.0GiB", "1.0Garbage-trucks-of-RAM" were all the same to QEMU.  No
> more.
> 
> All clear?

That said, virsh from libvirt manages to recognize 'G' and 'GiB' as
synonyms (powers of 2), as well as 'GB' (powers of 10); we could justify
patching qemu's parser to accept more valid suffixes, particularly since
'GiB' is a typical suffix that has seen use (in spite of it not being
documented).

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org


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[Qemu-devel] [Bug 1707297] Re: qemu became more picky parsing -m option

[John Florian]

Not sure why I can only see Markus' comment here as part of Eric's but
anyway... the behavior change *is* expected.

Can qemu behave more like virsh then?  That would be ideal IMHO.  I
prefer to specify my RAM in powers of 2 and disk in powers of 10 so that
when I test virtually using qemu I more closely match the exact
constraints of real hardware.  For the embedded work I do fitting in
tight confines, it can make a significant difference.

(I actually to this with a wrapper I have around qemu, which is why you
see a floating point value for GiB in my example above.  My wrapper
behaves like virsh and takes any *B, *iB format and regurgitates it into
something qemu accepts.)

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https://bugs.launchpad.net/bugs/1707297

Title:
  qemu became more picky parsing -m option

Status in QEMU:
  New

Bug description:
  With qemu-kvm-2.9.0-3.fc26.x86_64 I am no longer to specify the memory
  size using something like "-m 1.00000GiB" but with qemu-
  kvm-2.7.1-7.fc25.x86_64 I could without any problem.  I now get an
  error message like:

  qemu-system-x86_64: -m 1.00000GiB: Parameter 'size' expects a non-negative number below 2^64
  Optional suffix k, M, G, T, P or E means kilo-, mega-, giga-, tera-, peta-
  and exabytes, respectively.

  
  Is this expected or a regression?

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1707297/+subscriptions

Re: [Qemu-devel] [Bug 1707297] [NEW] qemu became more picky parsing -m option

[Markus Armbruster]

Eric Blake <eblake@redhat.com> writes:

> On 07/31/2017 03:34 AM, Markus Armbruster wrote:
>> John Florian <1707297@bugs.launchpad.net> writes:
>> 
>>> Public bug reported:
>>>
>>> With qemu-kvm-2.9.0-3.fc26.x86_64 I am no longer to specify the memory
>>> size using something like "-m 1.00000GiB" but with qemu-
>>> kvm-2.7.1-7.fc25.x86_64 I could without any problem.  I now get an error
>>> message like:
>>>
>>> qemu-system-x86_64: -m 1.00000GiB: Parameter 'size' expects a non-negative number below 2^64
>>> Optional suffix k, M, G, T, P or E means kilo-, mega-, giga-, tera-, peta-
>>> and exabytes, respectively.
>>>
>>>
>>> Is this expected or a regression?
>> 
>> We recognize suffix "G".  Before commit 75cdcd1 (v2.9.0), trailing
>> garbage after a recognized suffix was silently ignored.  "1.0G",
>> "1.0GiB", "1.0Garbage-trucks-of-RAM" were all the same to QEMU.  No
>> more.
>> 
>> All clear?
>
> That said, virsh from libvirt manages to recognize 'G' and 'GiB' as
> synonyms (powers of 2), as well as 'GB' (powers of 10); we could justify
> patching qemu's parser to accept more valid suffixes, particularly since
> 'GiB' is a typical suffix that has seen use (in spite of it not being
> documented).

I wouldn't object to such a patch, as long as it doesn't regress
consistency.  Easy if we do "number with suffix" in just one place.  We
might already do it, but I can't say offhand.  Also, the patch probably
shouldn't change qemu_strtosz_metric().

[Bug 1707297] Re: qemu became more picky parsing -m option

[Thomas Huth]

Looks like nobody cared to implement this within 3 years ... and IMHO
it's maybe even better to not overload the CLI syntax too much ... so
I'm closing this ticket now.

** Changed in: qemu
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/1707297

Title:
  qemu became more picky parsing -m option

Status in QEMU:
  Won't Fix

Bug description:
  With qemu-kvm-2.9.0-3.fc26.x86_64 I am no longer to specify the memory
  size using something like "-m 1.00000GiB" but with qemu-
  kvm-2.7.1-7.fc25.x86_64 I could without any problem.  I now get an
  error message like:

  qemu-system-x86_64: -m 1.00000GiB: Parameter 'size' expects a non-negative number below 2^64
  Optional suffix k, M, G, T, P or E means kilo-, mega-, giga-, tera-, peta-
  and exabytes, respectively.

  
  Is this expected or a regression?

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