From: Marc Zyngier <maz@kernel.org>
To: Alexey Kardashevskiy <aik@ozlabs.ru>
Cc: linux-kernel@vger.kernel.org,
"Thomas Gleixner" <tglx@linutronix.de>,
"Cédric Le Goater" <clg@kaod.org>,
"Michael Ellerman" <mpe@ellerman.id.au>, "Qian Cai" <cai@lca.pw>,
"Rob Herring" <robh@kernel.org>,
"Frederic Barrat" <fbarrat@linux.ibm.com>,
"Michal Suchánek" <msuchanek@suse.de>
Subject: Re: [PATCH kernel v3] genirq/irqdomain: Add reference counting to IRQs
Date: Sat, 14 Nov 2020 11:37:57 +0000 [thread overview]
Message-ID: <258becba10679166555137c7f2727265@kernel.org> (raw)
In-Reply-To: <98d06682-da53-c851-74a7-952bf958b793@ozlabs.ru>
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...
next prev parent reply other threads:[~2020-11-14 11:38 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-09 9:46 [PATCH kernel v3] genirq/irqdomain: Add reference counting to IRQs Alexey Kardashevskiy
2020-11-13 18:19 ` Cédric Le Goater
2020-11-14 3:55 ` Alexey Kardashevskiy
2020-11-13 18:34 ` Marc Zyngier
2020-11-14 3:37 ` Alexey Kardashevskiy
2020-11-14 9:42 ` Frederic Barrat
2020-11-14 11:37 ` Marc Zyngier [this message]
2020-11-14 12:45 ` Thomas Gleixner
2020-11-22 5:53 ` kernel test robot
2020-11-22 5:53 ` kernel test robot
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