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Re: [PULL 04/12] hmp: Simplify qom-set
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [PULL 04/12] hmp: Simplify qom-set |
Date: |
Wed, 3 Jun 2020 12:43:17 +0100 |
User-agent: |
Mutt/1.13.4 (2020-02-15) |
* David Hildenbrand (david@redhat.com) wrote:
> On 03.06.20 12:43, Dr. David Alan Gilbert wrote:
> > * David Hildenbrand (david@redhat.com) wrote:
> >> On 02.06.20 11:26, Dr. David Alan Gilbert wrote:
> >>> * Markus Armbruster (armbru@redhat.com) wrote:
> >>>> "Dr. David Alan Gilbert (git)" <dgilbert@redhat.com> writes:
> >>>>
> >>>>> From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
> >>>>>
> >>>>> Simplify qom_set by making it use qmp_qom_set and the JSON parser.
> >>>>>
> >>>>> (qemu) qom-get /machine smm
> >>>>> "auto"
> >>>>> (qemu) qom-set /machine smm "auto"
> >>>>>
> >>>>> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> >>>>> Message-Id: <20200520151108.160598-3-dgilbert@redhat.com>
> >>>>> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> >>>>> Reviewed-by: Markus Armbruster <armbru@redhat.com>
> >>>>> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> >>>>> With 's'->'S' type change suggested by Paolo and Markus
> >>>>
> >>>> This is actually more than just simplification, it's disarming a bear
> >>>> trap: the string visitor is restricted to a subset of the QAPI types,
> >>>> and when you qom-set a property with a type it can't handle, QEMU
> >>>> aborts. I mentioned this in the discussion of possible ways out of the
> >>>> qom-get impasse, but missed reraising it in patch review.
> >>>>
> >>>> A suitably amended commit would be nice, but respinning the PR just for
> >>>> that may not be worthwhile.
> >>>
> >>> A bit late; still as long as we're removing bear traps not adding them.
> >>
> >> This breaks qom-set for my (virtio-mem) use case:
> >>
> >> echo "qom-set vm0 requested-size 300M" | sudo nc -U /var/tmp/mon_src
> >> QEMU 5.0.50 monitor - type 'help' for more information
> >> (qemu) qom-set vm0 requested-size 300M
> >> Error: Expecting at most one JSON value
> >
> > Does qom-set vm0 requested-size 300e6 do the same thing?
>
> The property is defined to be of type "size".
>
> (qemu) qom-set vm0 requested-size 300e6
> Error: Parameter 'requested-size' expects uint64
>
> (not sure how "size" and "uint64" are mapped here)
I think the problem here is that the JSON parser is converting anything
with an 'e' as a float; JSON itself doesn't have the distinction
between int and float.
Dave
>
> --
> Thanks,
>
> David / dhildenb
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
- [PULL 00/12] migration/virtiofs/hmp queue, Dr. David Alan Gilbert (git), 2020/06/01
- [PULL 02/12] migration/rdma: cleanup rdma context before g_free to avoid memleaks, Dr. David Alan Gilbert (git), 2020/06/01
- [PULL 03/12] hmp: Implement qom-get HMP command, Dr. David Alan Gilbert (git), 2020/06/01
- [PULL 04/12] hmp: Simplify qom-set, Dr. David Alan Gilbert (git), 2020/06/01
- Re: [PULL 04/12] hmp: Simplify qom-set, Markus Armbruster, 2020/06/02
- Re: [PULL 04/12] hmp: Simplify qom-set, Dr. David Alan Gilbert, 2020/06/02
- Re: [PULL 04/12] hmp: Simplify qom-set, David Hildenbrand, 2020/06/03
- Re: [PULL 04/12] hmp: Simplify qom-set, Dr. David Alan Gilbert, 2020/06/03
- Re: [PULL 04/12] hmp: Simplify qom-set, David Hildenbrand, 2020/06/03
- Re: [PULL 04/12] hmp: Simplify qom-set, David Hildenbrand, 2020/06/03
- Re: [PULL 04/12] hmp: Simplify qom-set,
Dr. David Alan Gilbert <=
- Re: [PULL 04/12] hmp: Simplify qom-set, David Hildenbrand, 2020/06/03
- Re: [PULL 04/12] hmp: Simplify qom-set, Dr. David Alan Gilbert, 2020/06/03
- Re: [PULL 04/12] hmp: Simplify qom-set, David Hildenbrand, 2020/06/03
- Re: [PULL 04/12] hmp: Simplify qom-set, David Hildenbrand, 2020/06/03
- Re: [PULL 04/12] hmp: Simplify qom-set, Dr. David Alan Gilbert, 2020/06/03
[PULL 01/12] migration/rdma: fix potential nullptr access in rdma_start_incoming_migration, Dr. David Alan Gilbert (git), 2020/06/01
[PULL 05/12] virtiofsd: remove symlink fallbacks, Dr. David Alan Gilbert (git), 2020/06/01
[PULL 08/12] migration/colo.c: Use cpu_synchronize_all_states(), Dr. David Alan Gilbert (git), 2020/06/01
[PULL 06/12] migration/vmstate: Remove unnecessary MemoryRegion forward declaration, Dr. David Alan Gilbert (git), 2020/06/01
[PULL 09/12] migration/colo.c: Flush ram cache only after receiving device state, Dr. David Alan Gilbert (git), 2020/06/01