linux-kernel - Re: Relax CPU features sanity checking on heterogeneous architectures

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Date:   Fri, 11 Oct 2019 19:10:13 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Mark Rutland <mark.rutland@....com>, rnayak@...eaurora.org,
        suzuki.poulose@....com, catalin.marinas@....com,
        linux-arm-kernel <linux-arm-kernel-bounces@...ts.infradead.org>,
        linux-kernel@...r.kernel.org, jeremy.linton@....com,
        bjorn.andersson@...aro.org, linux-arm-msm@...r.kernel.org,
        andrew.murray@....com, will@...nel.org, Dave.Martin@....com,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm-owner@...r.kernel.org, marc.w.gonzalez@...e.fr
Subject: Re: Relax CPU features sanity checking on heterogeneous architectures

On 2019-10-11 19:04, Marc Zyngier wrote:
> On Fri, 11 Oct 2019 18:47:39 +0530
> Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org> wrote:
> 
>> Hi Mark,
>> 
>> Thanks a lot for the detailed explanations, I did have a look at all 
>> the variations before posting this.
>> 
>> On 2019-10-11 16:20, Mark Rutland wrote:
>> > Hi,
>> >
>> > On Fri, Oct 11, 2019 at 11:19:00AM +0530, Sai Prakash Ranjan wrote:
>> >> On latest QCOM SoCs like SM8150 and SC7180 with big.LITTLE arch, below
>> >> warnings are observed during bootup of big cpu cores.
>> >
>> > For reference, which CPUs are in those SoCs?
>> >
>> 
>> SM8150 is based on Cortex-A55(little cores) and Cortex-A76(big cores). 
>> I'm afraid I cannot give details about SC7180 yet.
>> 
>> >> SM8150:
>> >> >> [    0.271177] CPU features: SANITY CHECK: Unexpected variation in
>> >> SYS_ID_AA64PFR0_EL1. Boot CPU: 0x00000011112222, CPU4: >> 0x00000011111112
>> >
>> > The differing fields are EL3, EL2, and EL1: the boot CPU supports
>> > AArch64 and AArch32 at those exception levels, while the secondary only
>> > supports AArch64.
>> >
>> > Do we handle this variation in KVM?
>> 
>> We do not support KVM.
> 
> Mainline does. You don't get to pick and choose what is supported or
> not.
> 

Ok thats good.

Thanks,
Sai

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