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From: Marc Zyngier <maz@kernel.org>
To: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Russell King <linux@arm.linux.org.uk>,
	kvm@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Will Deacon <will@kernel.org>,
	kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [RFC PATCH 0/5] Removing support for 32bit KVM/arm host
Date: Thu, 20 Feb 2020 13:15:09 +0000
Message-ID: <43446bd5e884ae92f243799cbe748871@kernel.org> (raw)
In-Reply-To: <621a0a92-6432-6c3e-cb69-0b601764fa69@samsung.com>

Hi Marek,

On 2020-02-20 12:44, Marek Szyprowski wrote:
> Hi Marc,
> 
> On 10.02.2020 15:13, Marc Zyngier wrote:
>> KVM/arm was merged just over 7 years ago, and has lived a very quiet
>> life so far. It mostly works if you're prepared to deal with its
>> limitations, it has been a good prototype for the arm64 version,
>> but it suffers a few problems:
>> 
>> - It is incomplete (no debug support, no PMU)
>> - It hasn't followed any of the architectural evolutions
>> - It has zero users (I don't count myself here)
>> - It is more and more getting in the way of new arm64 developments
> 
> That is a bit sad information. Mainline Exynos finally got everything
> that was needed to run it on the quite popular Samsung Exynos5422-based
> Odroid XU4/HC1/MC1 boards. According to the Odroid related forums it is
> being used. We also use it internally at Samsung.

Something like "too little, too late" springs to mind, but let's be
constructive. Is anyone using it in a production environment, where
they rely on the latest mainline kernel having KVM support?

The current proposal is to still have KVM support in 5.6, as well as
ongoing support for stable kernels. If that's not enough, can you please
explain your precise use case?

         M.
-- 
Jazz is not dead. It just smells funny...
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Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20200210141344eucas1p25a6da0b0251931ef3659397a6f34c0c3@eucas1p2.samsung.com>
2020-02-10 14:13 ` Marc Zyngier
2020-02-10 14:13   ` [RFC PATCH 1/5] arm: Unplug KVM from the build system Marc Zyngier
2020-02-10 14:13   ` [RFC PATCH 2/5] arm: Remove KVM from config files Marc Zyngier
2020-02-10 14:13   ` [RFC PATCH 3/5] arm: Remove 32bit KVM host support Marc Zyngier
2020-02-10 14:13   ` [RFC PATCH 4/5] arm: Remove HYP/Stage-2 page-table support Marc Zyngier
2020-02-10 14:13   ` [RFC PATCH 5/5] arm: Remove GICv3 vgic compatibility macros Marc Zyngier
2020-02-10 15:21   ` [RFC PATCH 0/5] Removing support for 32bit KVM/arm host Olof Johansson
2020-02-10 15:54     ` Arnd Bergmann
2020-02-10 15:46   ` Will Deacon
2020-02-10 16:25   ` Russell King - ARM Linux admin
2020-02-10 16:26     ` Russell King - ARM Linux admin
2020-02-11 15:12   ` Vladimir Murzin
2020-02-11 15:23   ` Catalin Marinas
2020-02-17  0:14   ` Linus Walleij
2020-02-19 13:53   ` Stefan Agner
2020-02-20 11:01     ` Marc Zyngier
2020-02-19 14:56   ` Christoffer Dall
2020-02-19 15:09   ` Arnd Bergmann
2020-02-19 15:46     ` Jan Kiszka
2020-02-20 10:29       ` Marc Zyngier
2020-02-20 12:44   ` Marek Szyprowski
2020-02-20 13:15     ` Marc Zyngier [this message]
2020-02-20 13:17       ` Paolo Bonzini
2020-02-20 13:32       ` Robin Murphy
2020-02-20 14:01         ` Marc Zyngier
2020-02-20 14:38           ` Robin Murphy
2020-02-22 14:21   ` Takashi Yoshi
2020-02-22 14:40   ` Takashi Yoshi
2020-02-22 21:31     ` Arnd Bergmann
2020-02-25 21:34       ` Takashi Yoshi

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