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Re: [PATCH RFCv3 6/9] s390x/diag: subcode to query device memory region
From: |
Heiko Carstens |
Subject: |
Re: [PATCH RFCv3 6/9] s390x/diag: subcode to query device memory region |
Date: |
Mon, 27 Jul 2020 13:15:46 +0200 |
On Mon, Jul 27, 2020 at 12:12:02PM +0200, David Hildenbrand wrote:
> >>>> +#define DIAG500_DEVICE_MEMORY_REGION 4
> >>>
> >>> Regardless what we end up with, this needs to be specified
> >>> somewhere(tm).
> >>
> >> Yeah, there, we should also document the existing subcodes. What would
> >> be the right place for this? The kernel feels somewhat wrong to me.
> >
> > The still supported subcode 3 is properly specified in the virtio spec.
> > That's not a good place for that new one, though.
> >
> > QEMU is probably a better place than the kernel to specify stuff,
> > although it's not really ideal, either. OTOH, do we ever expect other
> > hypervisors to implement this new subcode?
>
> cloud-hypervisor implements virtio-mem. If it were ever to support s390x
> (guess it does not yet), it would also want to implement that one. But
> then, it can just look at QEMU doc I guess :)
It must be well defined and easy to find also for kernel developers
who actually have to care about memory detection code :)
- Re: [PATCH RFCv3 4/9] s390x: prepare for more diag500 hypercalls, (continued)
- [PATCH RFCv3 5/9] s390x: rename s390-virtio-hcall* to s390-hypercall*, David Hildenbrand, 2020/07/24
- [PATCH RFCv3 7/9] s390x: prepare device memory address space, David Hildenbrand, 2020/07/24
- [PATCH RFCv3 6/9] s390x/diag: subcode to query device memory region, David Hildenbrand, 2020/07/24
- Re: [PATCH RFCv3 6/9] s390x/diag: subcode to query device memory region, Cornelia Huck, 2020/07/27
- Re: [PATCH RFCv3 6/9] s390x/diag: subcode to query device memory region, David Hildenbrand, 2020/07/27
- Re: [PATCH RFCv3 6/9] s390x/diag: subcode to query device memory region, Cornelia Huck, 2020/07/27
- Re: [PATCH RFCv3 6/9] s390x/diag: subcode to query device memory region, David Hildenbrand, 2020/07/27
- Re: [PATCH RFCv3 6/9] s390x/diag: subcode to query device memory region,
Heiko Carstens <=
- Re: [PATCH RFCv3 6/9] s390x/diag: subcode to query device memory region, David Hildenbrand, 2020/07/27
- Re: [PATCH RFCv3 6/9] s390x/diag: subcode to query device memory region, Cornelia Huck, 2020/07/28
- Re: [PATCH RFCv3 6/9] s390x/diag: subcode to query device memory region, David Hildenbrand, 2020/07/29
- Re: [PATCH RFCv3 6/9] s390x/diag: subcode to query device memory region, Cornelia Huck, 2020/07/29
- Re: [PATCH RFCv3 6/9] s390x/diag: subcode to query device memory region, David Hildenbrand, 2020/07/29
- Re: [PATCH RFCv3 6/9] s390x/diag: subcode to query device memory region, Cornelia Huck, 2020/07/29
[PATCH RFCv3 3/9] s390x: remove hypercall registration mechanism, David Hildenbrand, 2020/07/24