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Subject: Re: [PATCH 5/6] arm64/cpufeature: Drop TraceFilt feature exposure
 from ID_DFR0 register
To:     Suzuki K Poulose <suzuki.poulose@arm.com>,
        linux-arm-kernel@lists.infradead.org
Cc:     mark.rutland@arm.com, catalin.marinas@arm.com,
        linux-kernel@vger.kernel.org, james.morse@arm.com, maz@kernel.org,
        will@kernel.org
References: <1580215149-21492-1-git-send-email-anshuman.khandual@arm.com>
 <1580215149-21492-6-git-send-email-anshuman.khandual@arm.com>
 <bb4d5175-1c72-a1a6-1e79-116991717fdf@arm.com>
From:   Anshuman Khandual <anshuman.khandual@arm.com>
Message-ID: <2b04eac1-b0e1-ec70-34dd-5bd64af8ada2@arm.com>
Date:   Thu, 2 Apr 2020 08:30:25 +0530
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On 03/20/2020 11:49 PM, Suzuki K Poulose wrote:
> On 01/28/2020 12:39 PM, Anshuman Khandual wrote:
>> ID_DFR0 based TraceFilt feature should not be exposed.
> 
> ... to guests.
> 
>  Hence lets drop it.

Sure, will do.

> 
> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> 
>>
>> Cc: Catalin Marinas <catalin.marinas@arm.com>
>> Cc: Will Deacon <will@kernel.org>
>> Cc: James Morse <james.morse@arm.com>
>> Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
>> Cc: Marc Zyngier <maz@kernel.org>
>> Cc: Mark Rutland <mark.rutland@arm.com>
>> Cc: linux-kernel@vger.kernel.org
>> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
>> ---
>>   arch/arm64/kernel/cpufeature.c | 1 -
>>   1 file changed, 1 deletion(-)
>>
>> diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
>> index 2726bd6441da..a8ded1f0eeaf 100644
>> --- a/arch/arm64/kernel/cpufeature.c
>> +++ b/arch/arm64/kernel/cpufeature.c
>> @@ -374,7 +374,6 @@ static const struct arm64_ftr_bits ftr_id_pfr2[] = {
>>   };
>>     static const struct arm64_ftr_bits ftr_id_dfr0[] = {
>> -    ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 28, 4, 0),
>>       S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 24, 4, 0xf),    /* PerfMon */
>>       ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 20, 4, 0),
>>       ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, 16, 4, 0),
>>
> 
> 
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