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From: Marc Zyngier <maz@kernel.org>
To: Vladimir Murzin <vladimir.murzin@arm.com>
Cc: kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2] ARM: virt: Relax arch timer version check during early boot
Date: Mon, 20 Jan 2020 14:01:52 +0000	[thread overview]
Message-ID: <c573c3f5b86ece28a10c2466e985b256@kernel.org> (raw)
In-Reply-To: <1579527498-31081-1-git-send-email-vladimir.murzin@arm.com>

On 2020-01-20 13:38, Vladimir Murzin wrote:
> Updates to the Generic Timer architecture allow ID_PFR1.GenTimer to
> have values other than 0 or 1 while still preserving backward
> compatibility. At the moment, Linux is quite strict in the way it
> handles this field at early boot and will not configure arch timer if
> it doesn't find the value 1.
> 
> Since here use ubfx for arch timer version extraction (hyb-stub build
> with -march=armv7-a, so it is safe)
> 
> To help backports (even though the code was correct at the time of 
> writing)
> Fixes: 8ec58be9f3ff ("ARM: virt: arch_timers: enable access to physical 
> timers")
> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>

Acked-by: Marc Zyngier <maz@kernel.org>

Feel free to put it into Russell's patch system.

Thanks,

         M.
-- 
Jazz is not dead. It just smells funny...
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https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <maz@kernel.org>
To: Vladimir Murzin <vladimir.murzin@arm.com>
Cc: kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2] ARM: virt: Relax arch timer version check during early boot
Date: Mon, 20 Jan 2020 14:01:52 +0000	[thread overview]
Message-ID: <c573c3f5b86ece28a10c2466e985b256@kernel.org> (raw)
In-Reply-To: <1579527498-31081-1-git-send-email-vladimir.murzin@arm.com>

On 2020-01-20 13:38, Vladimir Murzin wrote:
> Updates to the Generic Timer architecture allow ID_PFR1.GenTimer to
> have values other than 0 or 1 while still preserving backward
> compatibility. At the moment, Linux is quite strict in the way it
> handles this field at early boot and will not configure arch timer if
> it doesn't find the value 1.
> 
> Since here use ubfx for arch timer version extraction (hyb-stub build
> with -march=armv7-a, so it is safe)
> 
> To help backports (even though the code was correct at the time of 
> writing)
> Fixes: 8ec58be9f3ff ("ARM: virt: arch_timers: enable access to physical 
> timers")
> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>

Acked-by: Marc Zyngier <maz@kernel.org>

Feel free to put it into Russell's patch system.

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

  reply	other threads:[~2020-01-20 14:02 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-20 13:38 [PATCH v2] ARM: virt: Relax arch timer version check during early boot Vladimir Murzin
2020-01-20 13:38 ` Vladimir Murzin
2020-01-20 14:01 ` Marc Zyngier [this message]
2020-01-20 14:01   ` Marc Zyngier
2020-01-20 14:09   ` Vladimir Murzin
2020-01-20 14:09     ` Vladimir Murzin

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