Re: [PATCH RFC 0/1] To add HMP interface to dump PCI MSI-X table/PBA

[Jason Wang]

在 2021/4/24 上午1:26, Dongli Zhang 写道:
> On 4/22/21 11:01 PM, Jason Wang wrote:
> > 在 2021/4/23 下午12:47, Dongli Zhang 写道:
> > > This is inspired by the discussion with Jason on below patchset.
> > >
> > > https://urldefense.com/v3/__https://lists.gnu.org/archive/html/qemu-devel/2021-03/msg09020.html__;!!GqivPVa7Brio!KbGQZW5lq3JZ60k12NuWZ6Th1lT6AwmBTF0pBgoWUKKQ4-2UhdW57PtvXUN5XQnZ2NU$
> > >
> > > The new HMP command is introduced to dump the MSI-X table and PBA.
> > >
> > > Initially, I was going to add new option to "info pci". However, as the
> > > number of entries is not determined and the output of MSI-X table is much
> > > more similar to the output of hmp_info_tlb()/hmp_info_mem(), this patch
> > > adds interface for only HMP.
> > >
> > > The patch is tagged with RFC because I am looking for suggestions on:
> > >
> > > 1. Is it fine to add new "info msix <dev>" command?
> >
> > I wonder the reason for not simply reusing "info pci"?
> The "info pci" will show PCI data for all devices and it does not accept any
> argument to print for a specific device.
>
> In addition, the "info pci" relies on qmp_query_pci(), where this patch will not
> implement the interface for QMP considering the number of MSI-X entries is not
> determined.
>
> Suppose we have 10 NVMe (emulated by QEMU with default number of queues), we
> will have about 600+ lines of output.


I see.

Thanks


> Dongli Zhang
>
> > > 2. Is there any issue with output format?
> >
> > If it's not for QMP, I guess it's not a part of ABI so it should be fine.
> >
> >
> > > 3. Is it fine to add only for HMP, but not QMP?
> >
> > I think so.
> >
> > Thanks
> >
> >
> > > Thank you very much!
> > >
> > > Dongli Zhang