Re: [PATCH v2 00/14] s390x: virtio-mem support

[David Hildenbrand <david@redhat.com>]

On 13.11.24 15:46, David Hildenbrand wrote:
> On 08.10.24 12:54, David Hildenbrand wrote:
>> Based on current master.
>>
>> There is really not much left to do on s390x, because virtio-mem already
>> implements most things we need today (e.g., early-migration,
>> unplugged-inaccessible). The biggest part of this series is just doing what
>> we do with virtio-pci, wiring it up in the machine hotplug handler and ...
>> well, messing with the physical memory layout where we can now exceed
>> initial RAM size and have sparsity (memory holes).
>>
>> I tested a lot of things, including:
>>    * Memory hotplug/unplug
>>    * Device hotplug/unplug
>>    * System resets / reboots
>>    * Migrate to/from file (including storage attributes under KVM)
>>    * Basic live migration
>>    * Basic postcopy live migration
>>
>> More details on how to use it on s390x -- which is pretty much how
>> we use it on other architectures, except
>> s/virtio-mem-pci/virtio-mem-ccw/ --- is in the last patch.
>>
>> This series introduces a new diag(500) "STORAGE LIMIT" subcode that will
>> be documented in the kernel and at [2] once this+kernel part go upstream.
>>
>> There are not many s390x-specific virtio-mem future work items, except:
>> * Storage attribute migration might be improved
>> * We might want to reset storage attributes of unplugged memory
>>     (might or might not be required for upcoming page table reclaim in
>>      Linux; TBD)
>>
>> The Linux driver is available at [3].
>>
>> [1] https://lkml.kernel.org/r/20240906101658.514470-1-pbonzini@redhat.com
>> [2] https://gitlab.com/davidhildenbrand/s390x-os-virt-spec
>> [3] https://lkml.kernel.org/r/20240910191541.2179655-6-david@redhat.com
> 
> Gentle ping (and thanks to Thomas for the review!).
> 
> I assume the kernel portion will go upstream in the next merge window.
> I'd like get the QEMU parts merged soon after that.
> 
> 9.2 is going to get released in roughly one month, so there is still time.

In the meantime, 9.2 was released. I don't have any changes planned. 
Series still applies to current master, I'll do a quick test tomorrow.

> 
> @Thomas, this is mostly s390x stuff, so I guess it should go through the
> s390x tree? But I could also take this through my "memory devices" tree.
> 

@Thomas, any thoughts?

-- 
Cheers,

David / dhildenb