linux-kernel - Re: [PATCH] arm64: Add KRYO{3,4}XX CPU cores to spectre-v2 safe list

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Date:   Thu, 16 Jan 2020 21:41:50 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     Will Deacon <will@...nel.org>
Cc:     jhugo@...eaurora.org, Catalin Marinas <catalin.marinas@....com>,
        Marc Zyngier <maz@...nel.org>,
        Andre Przywara <andre.przywara@....com>,
        Mark Rutland <mark.rutland@....com>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Douglas Anderson <dianders@...omium.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        James Morse <james.morse@....com>
Subject: Re: [PATCH] arm64: Add KRYO{3,4}XX CPU cores to spectre-v2 safe list

Hi Will,

On 2020-01-16 21:02, Will Deacon wrote:
> [+Jeffrey]
> 
> On Thu, Jan 16, 2020 at 07:49:12PM +0530, Sai Prakash Ranjan wrote:
>> KRYO3XX silver CPU cores and KRYO4XX silver, gold CPU cores
>> are not affected by Spectre variant 2. Add them to spectre_v2
>> safe list to correct ARM_SMCCC_ARCH_WORKAROUND_1 warning and
>> vulnerability sysfs value.
>> 
>> Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
>> ---
>>  arch/arm64/include/asm/cputype.h | 6 ++++++
>>  arch/arm64/kernel/cpu_errata.c   | 3 +++
>>  2 files changed, 9 insertions(+)
>> 
>> diff --git a/arch/arm64/include/asm/cputype.h 
>> b/arch/arm64/include/asm/cputype.h
>> index aca07c2f6e6e..7219cddeba66 100644
>> --- a/arch/arm64/include/asm/cputype.h
>> +++ b/arch/arm64/include/asm/cputype.h
>> @@ -85,6 +85,9 @@
>>  #define QCOM_CPU_PART_FALKOR_V1		0x800
>>  #define QCOM_CPU_PART_FALKOR		0xC00
>>  #define QCOM_CPU_PART_KRYO		0x200
>> +#define QCOM_CPU_PART_KRYO_3XX_SILVER	0x803
>> +#define QCOM_CPU_PART_KRYO_4XX_GOLD	0x804
>> +#define QCOM_CPU_PART_KRYO_4XX_SILVER	0x805
> 
> Jeffrey is the only person I know who understands the CPU naming here, 
> so
> I've added him in case this needs either renaming or extending to cover
> other CPUs. I wouldn't be at all surprised if we need a function call
> rather than a bunch of table entries...
> 
> That said, the internet claims that KRYO4XX gold is based on 
> Cortex-A76,
> and so CSV2 should be set...
> 

Yes the internet claims are true and CSV2 is set. SANITY check logs in 
here show ID_PFR0_EL1 - https://lore.kernel.org/patchwork/patch/1138457/

Thanks,
Sai

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