Re: Fortnightly KVM call minutes for 2023-01-24

[Bernhard Beschow <shentey@gmail.com>]

Am 24. Januar 2023 14:56:15 UTC schrieb Juan Quintela <quintela@redhat.com>:
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>First part stolen from: https://etherpad.opendev.org/p/qemu-emulation-bof%402023-01-24
>      thanks Phillippe
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>Single QEMU-system binary and Dynamic Machine Models
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>Meeting link: https://meet.jit.si/kvmcallmeeting
>Just want to dial in on your phone? Dial-in: +1.512.647.1431 PIN: 1518845548#
>Click this link to see the dial in phone numbers for this meeting https://meet.jit.si/static/dialInInfo.html?room=kvmcallmeeting
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>What needs to be done?
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>    TCG
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>    How to use different page sizes
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>    -> convert to page-vary (already used by ARM/MIPS)
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>    ref: https://lore.kernel.org/qemu-devel/20221228171617.059750c3@orange/
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>    HW models / machine
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>    How to create/realize 2 QOM objects which depend on each other?
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>    what (properties) need to be wired? IRQ, reset lines, MR?
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>    Sysbus: Demote it to plain qdev?
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>    con:
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>    sysbus helpful to remove qdev boilerplace/verbose code
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>    sysbus tree does the resets [currently blocking qdev conversion]
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>    pro:
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>    sysbus IRQ API
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>    too abstract, not very helpful, "named gpios" API is clearer
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>    sysbus MMIO API
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>    also kinda abstract, MRs indexed. No qdev equivalent
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>    sysbus IO API:
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>    not very used. first we need to get rid of ISA bus singleton

I've just submitted v2 of my patch series removing the ISA bus singleton: https://lore.kernel.org/qemu-devel/20230126211740.66874-1-shentey@gmail.com

Best regards,
Bernhard

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>    Single 32/64 *targets* binary
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>    Which 32-bit hosts are still used? OK to deprecate them?
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>    Some targets need special care i.e. KVM 32-bit ARM vCPU on 64-bit Aarch64 host
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>Previous notes:
>    https://etherpad.opendev.org/p/qemu-emulation-bof%402022-12-13
>    https://etherpad.opendev.org/p/qemu-emulation-bof%402022-11-29
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>Do we care about this?
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>64 bits guests on 32 bits hosts: OK to deprecate
>32 bits hosts: still in (some) use
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>Creating and realizing two objects than need to be linked together.
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>We can't do it with realize, perhaps we need an intermediate state to
>do the link, and then realize.
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>Can we get Peter or Markus or Paolo for the next call?
>waiting to get some patches into the list for discussing.
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>Problem for Phillipe is that he has to do changes to the API's and
>want to be sure that they are agreed before he changes all
>devices/targets, a multi month task.
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>For removing sysbus, we need to wait for reset rework from Peter?
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>Expose the memory API to external processes.
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>Under what circumstances you should be able to create/destroy a memory
>region?
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>Later, Juan.
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