From: Marc Zyngier <maz@kernel.org>
To: Stefan Agner <stefan@agner.ch>
Cc: linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org,
Vladimir Murzin <vladimir.murzin@arm.com>,
Russell King <linux@arm.linux.org.uk>,
Arnd Bergmann <arnd@arndb.de>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Quentin Perret <qperret@google.com>,
Christoffer Dall <Christoffer.Dall@arm.com>,
James Morse <james.morse@arm.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Will Deacon <will@kernel.org>,
Julien Thierry <julien.thierry.kdev@gmail.com>
Subject: Re: [RFC PATCH 0/5] Removing support for 32bit KVM/arm host
Date: Thu, 20 Feb 2020 11:01:48 +0000 [thread overview]
Message-ID: <cbad8640f275b9beab471ddd3136da72@kernel.org> (raw)
In-Reply-To: <69845f739bbd91e73cd82e7c4683ab5a@agner.ch>
On 2020-02-19 13:53, Stefan Agner wrote:
> On 2020-02-10 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
>>
>> So here it is: unless someone screams and shows that they rely on
>> KVM/arm to be maintained upsteam, I'll remove 32bit host support
>> form the tree. One of the reasons that makes me confident nobody is
>> using it is that I never receive *any* bug report. Yes, it is perfect.
>
> Not entirely true:
> https://lore.kernel.org/m/e2f7196ca6c70c55463a45b490f6731a@agner.ch
And I thank you for that. This bug was actually hitting both arm and
arm64, and triggered by a bogus DT (that KVM should have handled in a
nicer way). What I was trying to say is that nobody reports bugs that
are specific to 32bit KVM/arm.
> But, after that was fixed, it actually was perfect :-D
> https://blog.printk.io/2016/09/kvm-with-kvmtool-on-armv7/
Hey, neat! not sure how useful, but neat nonetheless... ;-)
> That said, I never used it in a real-world application, so from my side
> removing it is fine.
Thanks,
M.
--
Jazz is not dead. It just smells funny...
WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <maz@kernel.org>
To: Stefan Agner <stefan@agner.ch>
Cc: Russell King <linux@arm.linux.org.uk>,
kvm@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
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 11:01:48 +0000 [thread overview]
Message-ID: <cbad8640f275b9beab471ddd3136da72@kernel.org> (raw)
In-Reply-To: <69845f739bbd91e73cd82e7c4683ab5a@agner.ch>
On 2020-02-19 13:53, Stefan Agner wrote:
> On 2020-02-10 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
>>
>> So here it is: unless someone screams and shows that they rely on
>> KVM/arm to be maintained upsteam, I'll remove 32bit host support
>> form the tree. One of the reasons that makes me confident nobody is
>> using it is that I never receive *any* bug report. Yes, it is perfect.
>
> Not entirely true:
> https://lore.kernel.org/m/e2f7196ca6c70c55463a45b490f6731a@agner.ch
And I thank you for that. This bug was actually hitting both arm and
arm64, and triggered by a bogus DT (that KVM should have handled in a
nicer way). What I was trying to say is that nobody reports bugs that
are specific to 32bit KVM/arm.
> But, after that was fixed, it actually was perfect :-D
> https://blog.printk.io/2016/09/kvm-with-kvmtool-on-armv7/
Hey, neat! not sure how useful, but neat nonetheless... ;-)
> That said, I never used it in a real-world application, so from my side
> removing it is fine.
Thanks,
M.
--
Jazz is not dead. It just smells funny...
_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <maz@kernel.org>
To: Stefan Agner <stefan@agner.ch>
Cc: Vladimir Murzin <vladimir.murzin@arm.com>,
Russell King <linux@arm.linux.org.uk>,
kvm@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Quentin Perret <qperret@google.com>,
Christoffer Dall <Christoffer.Dall@arm.com>,
James Morse <james.morse@arm.com>,
Julien Thierry <julien.thierry.kdev@gmail.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 11:01:48 +0000 [thread overview]
Message-ID: <cbad8640f275b9beab471ddd3136da72@kernel.org> (raw)
In-Reply-To: <69845f739bbd91e73cd82e7c4683ab5a@agner.ch>
On 2020-02-19 13:53, Stefan Agner wrote:
> On 2020-02-10 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
>>
>> So here it is: unless someone screams and shows that they rely on
>> KVM/arm to be maintained upsteam, I'll remove 32bit host support
>> form the tree. One of the reasons that makes me confident nobody is
>> using it is that I never receive *any* bug report. Yes, it is perfect.
>
> Not entirely true:
> https://lore.kernel.org/m/e2f7196ca6c70c55463a45b490f6731a@agner.ch
And I thank you for that. This bug was actually hitting both arm and
arm64, and triggered by a bogus DT (that KVM should have handled in a
nicer way). What I was trying to say is that nobody reports bugs that
are specific to 32bit KVM/arm.
> But, after that was fixed, it actually was perfect :-D
> https://blog.printk.io/2016/09/kvm-with-kvmtool-on-armv7/
Hey, neat! not sure how useful, but neat nonetheless... ;-)
> That said, I never used it in a real-world application, so from my side
> removing it is fine.
Thanks,
M.
--
Jazz is not dead. It just smells funny...
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-02-20 11:01 UTC|newest]
Thread overview: 92+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20200210141344eucas1p25a6da0b0251931ef3659397a6f34c0c3@eucas1p2.samsung.com>
2020-02-10 14:13 ` [RFC PATCH 0/5] Removing support for 32bit KVM/arm host Marc Zyngier
2020-02-10 14:13 ` Marc Zyngier
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 ` Marc Zyngier
2020-02-10 14:13 ` Marc Zyngier
2020-02-10 14:13 ` [RFC PATCH 2/5] arm: Remove KVM from config files Marc Zyngier
2020-02-10 14:13 ` Marc Zyngier
2020-02-10 14:13 ` Marc Zyngier
2020-02-10 14:13 ` [RFC PATCH 3/5] arm: Remove 32bit KVM host support Marc Zyngier
2020-02-10 14:13 ` Marc Zyngier
2020-02-10 14:13 ` 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 ` Marc Zyngier
2020-02-10 14:13 ` Marc Zyngier
2020-02-10 14:13 ` [RFC PATCH 5/5] arm: Remove GICv3 vgic compatibility macros Marc Zyngier
2020-02-10 14:13 ` Marc Zyngier
2020-02-10 14:13 ` Marc Zyngier
2020-02-10 15:21 ` [RFC PATCH 0/5] Removing support for 32bit KVM/arm host Olof Johansson
2020-02-10 15:21 ` Olof Johansson
2020-02-10 15:21 ` Olof Johansson
2020-02-10 15:54 ` Arnd Bergmann
2020-02-10 15:54 ` Arnd Bergmann
2020-02-10 15:54 ` Arnd Bergmann
2020-02-10 15:46 ` Will Deacon
2020-02-10 15:46 ` Will Deacon
2020-02-10 15:46 ` Will Deacon
2020-02-10 16:25 ` Russell King - ARM Linux admin
2020-02-10 16:25 ` Russell King - ARM Linux admin
2020-02-10 16:25 ` Russell King - ARM Linux admin
2020-02-10 16:26 ` Russell King - ARM Linux admin
2020-02-10 16:26 ` 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 15:12 ` Vladimir Murzin
2020-02-11 15:12 ` Vladimir Murzin
2020-02-11 15:23 ` Catalin Marinas
2020-02-11 15:23 ` Catalin Marinas
2020-02-11 15:23 ` Catalin Marinas
2020-02-17 0:14 ` Linus Walleij
2020-02-17 0:14 ` Linus Walleij
2020-02-17 0:14 ` Linus Walleij
2020-02-19 13:53 ` Stefan Agner
2020-02-19 13:53 ` Stefan Agner
2020-02-19 13:53 ` Stefan Agner
2020-02-20 11:01 ` Marc Zyngier [this message]
2020-02-20 11:01 ` Marc Zyngier
2020-02-20 11:01 ` Marc Zyngier
2020-02-19 14:56 ` Christoffer Dall
2020-02-19 14:56 ` Christoffer Dall
2020-02-19 14:56 ` Christoffer Dall
2020-02-19 15:09 ` Arnd Bergmann
2020-02-19 15:09 ` Arnd Bergmann
2020-02-19 15:09 ` Arnd Bergmann
2020-02-19 15:46 ` Jan Kiszka
2020-02-19 15:46 ` Jan Kiszka
2020-02-19 15:46 ` Jan Kiszka
2020-02-20 10:29 ` Marc Zyngier
2020-02-20 10:29 ` Marc Zyngier
2020-02-20 10:29 ` Marc Zyngier
2020-02-20 12:44 ` Marek Szyprowski
2020-02-20 12:44 ` Marek Szyprowski
2020-02-20 12:44 ` Marek Szyprowski
2020-02-20 13:15 ` Marc Zyngier
2020-02-20 13:15 ` Marc Zyngier
2020-02-20 13:15 ` Marc Zyngier
2020-02-20 13:17 ` Paolo Bonzini
2020-02-20 13:17 ` Paolo Bonzini
2020-02-20 13:17 ` Paolo Bonzini
2020-02-20 13:32 ` Robin Murphy
2020-02-20 13:32 ` Robin Murphy
2020-02-20 13:32 ` Robin Murphy
2020-02-20 14:01 ` Marc Zyngier
2020-02-20 14:01 ` Marc Zyngier
2020-02-20 14:01 ` Marc Zyngier
2020-02-20 14:38 ` Robin Murphy
2020-02-20 14:38 ` Robin Murphy
2020-02-20 14:38 ` Robin Murphy
2020-02-22 14:21 ` Takashi Yoshi
2020-02-22 14:21 ` Takashi Yoshi
2020-02-22 14:40 ` Takashi Yoshi
2020-02-22 14:40 ` Takashi Yoshi
2020-02-22 14:40 ` Takashi Yoshi
2020-02-22 21:31 ` Arnd Bergmann
2020-02-22 21:31 ` Arnd Bergmann
2020-02-22 21:31 ` Arnd Bergmann
2020-02-25 21:34 ` Takashi Yoshi
2020-02-25 21:34 ` Takashi Yoshi
2020-02-25 21:34 ` Takashi Yoshi
[not found] <mailman.29637.1581344013.2486.linux-arm-kernel@lists.infradead.org>
2020-02-18 21:37 ` Daniel Golle
2020-02-19 8:31 ` Marc Zyngier
[not found] ` <CGME20200220130838eucas1p12bc652ecd882204a8ffda5ed28f48bd5@eucas1p1.samsung.com>
2020-02-20 13:08 ` Bartlomiej Zolnierkiewicz
2020-02-20 13:39 ` Marc Zyngier
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