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    SubjectRe: [PATCH kernel v3] genirq/irqdomain: Add reference counting to IRQs
    On 2020-11-14 03:37, Alexey Kardashevskiy wrote:

    >>> What is the easiest way to get irq-hierarchical hardware?
    >>> I have a bunch of powerpc boxes (no good) but also a raspberry pi,
    >>> a bunch of 32/64bit orange pi's, an "armada" arm box,
    >>> thinkpads - is any of this good for the task?
    >>
    >> If your HW doesn't require an interrupt hierarchy, run VMs!
    >> Booting an arm64 guest with virtual PCI devices will result in
    >> hierarchies being created (PCI-MSI -> GIC MSI widget -> GIC).
    >
    > Absolutely :) But the beauty of ARM is that one can buy an actual ARM
    > device for 20$, I have "opi one+ allwinner h6 64bit cortex a53 1GB
    > RAM", is it worth using KVM on this device, or is it too small for
    > that?

    I've run VMs on smaller machines. 256MB of guest RAM is enough to boot
    a full blown Debian system with PCI devices, and your AW box should be
    up to the task as long as you run a mainline kernel on it. Please don't
    add to the pile of junk!

    >> You can use KVM, or even bare QEMU on x86 if you are so inclined.
    >
    > Have a QEMU command line handy for x86/tcg?

    /me digs, as my x86 boxes are overspec'd X terminals these days:

    Here you go, courtesy of Will:
    http://cdn.kernel.org/pub/linux/kernel/people/will/docs/qemu/qemu-arm64-howto.html

    M.
    --
    Jazz is not dead. It just smells funny...

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