linux-kernel - Re: [PATCH V2] arm64/cpufeature: Drop open encodings while extracting parange

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Message-ID: <20200518170934.GT32394@willie-the-truck>
Date:   Mon, 18 May 2020 18:09:34 +0100
From:   Will Deacon <will@...nel.org>
To:     Anshuman Khandual <anshuman.khandual@....com>
Cc:     mark.rutland@....com, Catalin Marinas <catalin.marinas@....com>,
        linux-kernel@...r.kernel.org, James Morse <james.morse@....com>,
        Marc Zyngier <maz@...nel.org>, kvmarm@...ts.cs.columbia.edu,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH V2] arm64/cpufeature: Drop open encodings while
 extracting parange

On Mon, May 18, 2020 at 05:59:59PM +0100, Will Deacon wrote:
> On Wed, May 13, 2020 at 02:33:34PM +0530, Anshuman Khandual wrote:
> > Currently there are multiple instances of parange feature width mask open
> > encodings while fetching it's value. Even the width mask value (0x7) itself
> > is not accurate. It should be (0xf) per ID_AA64MMFR0_EL1.PARange[3:0] as in
> > ARM ARM (0487F.a). Replace them with cpuid_feature_extract_unsigned_field()
> > which can extract given standard feature (4 bits width i.e 0xf mask) field.
> > 
> > Cc: Catalin Marinas <catalin.marinas@....com>
> > Cc: Will Deacon <will@...nel.org>
> > Cc: Marc Zyngier <maz@...nel.org>
> > Cc: James Morse <james.morse@....com>
> > Cc: kvmarm@...ts.cs.columbia.edu
> > Cc: linux-arm-kernel@...ts.infradead.org
> > Cc: linux-kernel@...r.kernel.org
> > 
> > Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
> > ---
> > Changes in V2:
> > 
> > - Used cpuid_feature_extract_unsigned_field() per Mark
> > 
> > Changes in V1: (https://patchwork.kernel.org/patch/11541913/)
> > 
> >  arch/arm64/kernel/cpufeature.c |  3 ++-
> >  arch/arm64/kvm/reset.c         | 11 ++++++++---
> >  2 files changed, 10 insertions(+), 4 deletions(-)
> 
> Acked-by: Will Deacon <will@...nel.org>
> 
> I'm assuming Marc will take this, but let me know if it should go via arm64
> instead (where we have a bunch of other cpufeature stuff queued).

Hmm, but having just spotted [1], it looks like we might need a bit of
co-ordination here. Marc?

Will

[1] https://lore.kernel.org/r/1589248647-22925-1-git-send-email-anshuman.khandual@arm.com