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(p200300cbc72af600c577b537f52ab994.dip0.t-ipconnect.de. [2003:cb:c72a:f600:c577:b537:f52a:b994]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-436362c7d59sm95197415e9.43.2024.12.16.13.18.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 16 Dec 2024 13:18:45 -0800 (PST) Message-ID: <15947eee-1e01-4b8a-b750-417250899ecd@redhat.com> Date: Mon, 16 Dec 2024 22:18:43 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 00/14] s390x: virtio-mem support From: David Hildenbrand To: Thomas Huth , qemu-devel@nongnu.org Cc: qemu-s390x@nongnu.org, Paolo Bonzini , Halil Pasic , Christian Borntraeger , Eric Farman , Richard Henderson , Nina Schoetterl-Glausch , Heiko Carstens , Ilya Leoshkevich , Janosch Frank , "Michael S. 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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? >> >> I'm fine either way - feel free to put it into your tree, otherwise I'll >> pick it up likely sometime next week. > > Okay, let me let this sit here for a couple days longer and retest it > next week. I can queue it then, as another required patch ("virtio-mem: > unplug memory only during system resets, not device resets") still sits > in my tree all-lonely. :) Testing revealed no surprised. Queued to https://github.com/davidhildenbrand/qemu.git mem-next -- Cheers, David / dhildenb