[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH v4 07/10] s390x/sclp: properly guard pci-specifi
From: |
Halil Pasic |
Subject: |
Re: [Qemu-devel] [PATCH v4 07/10] s390x/sclp: properly guard pci-specific functions |
Date: |
Tue, 22 Aug 2017 15:00:32 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.0 |
On 08/22/2017 02:57 PM, Cornelia Huck wrote:
> On Tue, 22 Aug 2017 11:39:14 +0200
> Cornelia Huck <address@hidden> wrote:
>
>> On Tue, 22 Aug 2017 11:20:51 +0200
>> Halil Pasic <address@hidden> wrote:
>>
>>> On 08/22/2017 10:39 AM, Cornelia Huck wrote:
>>>>> I'm fine either way. If I imagine having a lots of adapter types, then I
>>>>> would expect a switch or a jumptable on the type before handling control
>>>>> to the pci specific function. In this case statically not supported types
>>>>> would probably get caught by the default branch of the switch and for a
>>>>> jumptable it could even handle the dynamic case (based on the facilities)
>>>>> trivially. In short both approaches can make sense.
>>>> I'm also wondering at the naming (the command sounds very
>>>> pci-specific). I'd just stick with this approach (modulo a possible
>>>> change of the response code, for which I need to rely on you guys).
>>>>
>>>
>>>
>>> Well, the QEMU name of the command is misleading misleading. In the AR
>>> it's called 'Configure I/O Adapter'. The PCI comes into the picture via
>>> byte 8 of the SCCB, the so called adapter type. Valid values for the
>>> adapter type are: 00-01 reserved; 02 PCI function; 03-FF reserved. So
>>> at this point we only have PCI.
>>
>> OK, misleading naming combined with missing documentation leads to
>> confusion...
>>
>> So:
>>
>> - s/PCI/IOA/ for SCLP_CMDW_{CONFIGURE,DECONFIGURE}_PCI
>> - have a switch/case over byte 8 with only one case (pci)
>
> - switch to response code 0x06f0 instead of invalid command
>
>> - move the pci feature check into the pci code(? - not sure)
>>
>> There's still the question of when this sclp command first became
>> available...
>
> ...because we probably want to indicate invalid command for older
> machine types (or is there another facility bit?)
>
> Another question: There's the sclp facilities bit SCLP_HAS_PCI_RECONFIG
> - is that really pci, or I/O adapter as for the actual commands?
>
> [The Linux kernel uses the _PCI naming scheme, so I can't derive
> anything from that.]
>
Ah, we to each other almost simultaneously... See my other mail.
- Re: [Qemu-devel] [PATCH v4 07/10] s390x/sclp: properly guard pci-specific functions, (continued)
Re: [Qemu-devel] [PATCH v4 07/10] s390x/sclp: properly guard pci-specific functions, Pierre Morel, 2017/08/21
- Re: [Qemu-devel] [PATCH v4 07/10] s390x/sclp: properly guard pci-specific functions, Halil Pasic, 2017/08/21
- Re: [Qemu-devel] [PATCH v4 07/10] s390x/sclp: properly guard pci-specific functions, Cornelia Huck, 2017/08/22
- Re: [Qemu-devel] [PATCH v4 07/10] s390x/sclp: properly guard pci-specific functions, Halil Pasic, 2017/08/22
- Re: [Qemu-devel] [PATCH v4 07/10] s390x/sclp: properly guard pci-specific functions, Cornelia Huck, 2017/08/22
- Re: [Qemu-devel] [PATCH v4 07/10] s390x/sclp: properly guard pci-specific functions, Cornelia Huck, 2017/08/22
- Re: [Qemu-devel] [PATCH v4 07/10] s390x/sclp: properly guard pci-specific functions,
Halil Pasic <=
Re: [Qemu-devel] [PATCH v4 07/10] s390x/sclp: properly guard pci-specific functions, Halil Pasic, 2017/08/22
Re: [Qemu-devel] [PATCH v4 07/10] s390x/sclp: properly guard pci-specific functions, Cornelia Huck, 2017/08/22
Re: [Qemu-devel] [PATCH v4 07/10] s390x/sclp: properly guard pci-specific functions, Halil Pasic, 2017/08/22
Re: [Qemu-devel] [PATCH v4 07/10] s390x/sclp: properly guard pci-specific functions, Cornelia Huck, 2017/08/22
Re: [Qemu-devel] [PATCH v4 07/10] s390x/sclp: properly guard pci-specific functions, Halil Pasic, 2017/08/22
Re: [Qemu-devel] [PATCH v4 07/10] s390x/sclp: properly guard pci-specific functions, Cornelia Huck, 2017/08/22
Re: [Qemu-devel] [PATCH v4 07/10] s390x/sclp: properly guard pci-specific functions, Cornelia Huck, 2017/08/22
Re: [Qemu-devel] [PATCH v4 07/10] s390x/sclp: properly guard pci-specific functions, Halil Pasic, 2017/08/22
Re: [Qemu-devel] [PATCH v4 07/10] s390x/sclp: properly guard pci-specific functions, Cornelia Huck, 2017/08/22
[Qemu-devel] [PATCH v4 09/10] s390x/kvm: msi route fixup for non-pci, Cornelia Huck, 2017/08/21