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From: Oliver Upton <oliver.upton@linux.dev>
To: Marc Zyngier <maz@kernel.org>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>,
	kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
	kvm@vger.kernel.org, James Morse <james.morse@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Zenghui Yu <yuzenghui@huawei.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>
Subject: Re: [PATCH 2/2] arm64: cpufeatures: Only check for NV1 if NV is present
Date: Thu, 15 Feb 2024 02:02:24 +0000	[thread overview]
Message-ID: <Zc1wsKzAvooOvR-v@linux.dev> (raw)
In-Reply-To: <86bk8k5ts3.wl-maz@kernel.org>

On Tue, Feb 13, 2024 at 02:21:48PM +0000, Marc Zyngier wrote:
> From cd75279d3b6c387c13972b61c486a203d9652e97 Mon Sep 17 00:00:00 2001
> From: Marc Zyngier <maz@kernel.org>
> Date: Tue, 13 Feb 2024 13:37:57 +0000
> Subject: [PATCH] arm64: cpufeatures: Fix FEAT_NV check when checking for
>  FEAT_NV1
> 
> Using this_cpu_has_cap() has the potential to go wrong when
> used system-wide on a preemptible kernel. Instead, use the
> __system_matches_cap() helper when checking for FEAT_NV in the
> FEAT_NV1 probing helper.
> 
> Fixes: 3673d01a2f55 ("arm64: cpufeatures: Only check for NV1 if NV is present")
> Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Signed-off-by: Marc Zyngier <maz@kernel.org>

b4 wasn't very happy with grabbing this patch in reply to a series
(probably user error), but I've picked this up for kvmarm/next.

https://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git/commit/?id=9aa030cee1c45d6e962f6bf22ba63d4aff2b1644

-- 
Thanks,
Oliver

WARNING: multiple messages have this Message-ID (diff)
From: Oliver Upton <oliver.upton@linux.dev>
To: Marc Zyngier <maz@kernel.org>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>,
	kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
	kvm@vger.kernel.org, James Morse <james.morse@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Zenghui Yu <yuzenghui@huawei.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>
Subject: Re: [PATCH 2/2] arm64: cpufeatures: Only check for NV1 if NV is present
Date: Thu, 15 Feb 2024 02:02:24 +0000	[thread overview]
Message-ID: <Zc1wsKzAvooOvR-v@linux.dev> (raw)
In-Reply-To: <86bk8k5ts3.wl-maz@kernel.org>

On Tue, Feb 13, 2024 at 02:21:48PM +0000, Marc Zyngier wrote:
> From cd75279d3b6c387c13972b61c486a203d9652e97 Mon Sep 17 00:00:00 2001
> From: Marc Zyngier <maz@kernel.org>
> Date: Tue, 13 Feb 2024 13:37:57 +0000
> Subject: [PATCH] arm64: cpufeatures: Fix FEAT_NV check when checking for
>  FEAT_NV1
> 
> Using this_cpu_has_cap() has the potential to go wrong when
> used system-wide on a preemptible kernel. Instead, use the
> __system_matches_cap() helper when checking for FEAT_NV in the
> FEAT_NV1 probing helper.
> 
> Fixes: 3673d01a2f55 ("arm64: cpufeatures: Only check for NV1 if NV is present")
> Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Signed-off-by: Marc Zyngier <maz@kernel.org>

b4 wasn't very happy with grabbing this patch in reply to a series
(probably user error), but I've picked this up for kvmarm/next.

https://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git/commit/?id=9aa030cee1c45d6e962f6bf22ba63d4aff2b1644

-- 
Thanks,
Oliver

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linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2024-02-15  2:02 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-02-12 14:47 [PATCH 0/2] ARM64: Fixes for FEAT_E2H0 handling Marc Zyngier
2024-02-12 14:47 ` Marc Zyngier
2024-02-12 14:47 ` [PATCH 1/2] arm64: cpufeatures: Add missing ID_AA64MMFR4_EL1 to __read_sysreg_by_encoding() Marc Zyngier
2024-02-12 14:47   ` Marc Zyngier
2024-02-12 14:47 ` [PATCH 2/2] arm64: cpufeatures: Only check for NV1 if NV is present Marc Zyngier
2024-02-12 14:47   ` Marc Zyngier
2024-02-13 11:14   ` Marek Szyprowski
2024-02-13 11:14     ` Marek Szyprowski
2024-02-13 14:21     ` Marc Zyngier
2024-02-13 14:21       ` Marc Zyngier
2024-02-13 14:54       ` Suzuki K Poulose
2024-02-13 14:54         ` Suzuki K Poulose
2024-02-13 20:06       ` Marek Szyprowski
2024-02-13 20:06         ` Marek Szyprowski
2024-02-15  2:02       ` Oliver Upton [this message]
2024-02-15  2:02         ` Oliver Upton
2024-02-15 15:19         ` Marc Zyngier
2024-02-15 15:19           ` Marc Zyngier
2024-02-12 18:05 ` [PATCH 0/2] ARM64: Fixes for FEAT_E2H0 handling Oliver Upton
2024-02-12 18:05   ` Oliver Upton

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