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From: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
To: Marc Zyngier <maz@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
	rnayak@codeaurora.org, suzuki.poulose@arm.com,
	catalin.marinas@arm.com,
	linux-arm-kernel <linux-arm-kernel-bounces@lists.infradead.org>,
	linux-kernel@vger.kernel.org, jeremy.linton@arm.com,
	bjorn.andersson@linaro.org, linux-arm-msm@vger.kernel.org,
	andrew.murray@arm.com, will@kernel.org, Dave.Martin@arm.com,
	linux-arm-kernel@lists.infradead.org,
	linux-arm-msm-owner@vger.kernel.org, marc.w.gonzalez@free.fr
Subject: Re: Relax CPU features sanity checking on heterogeneous architectures
Date: Fri, 11 Oct 2019 19:10:13 +0530
Message-ID: <ac7599b30461d6a814e4f36d68bba6c2@codeaurora.org> (raw)
In-Reply-To: <20191011143442.515659f4@why>

On 2019-10-11 19:04, Marc Zyngier wrote:
> On Fri, 11 Oct 2019 18:47:39 +0530
> Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.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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Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-11  5:49 Sai Prakash Ranjan
2019-10-11  9:19 ` Marc Gonzalez
2019-10-11  9:57   ` Sai Prakash Ranjan
2019-10-11 10:50 ` Mark Rutland
2019-10-11 11:09   ` Marc Gonzalez
2019-10-11 13:33     ` Sai Prakash Ranjan
2019-10-11 13:17   ` Sai Prakash Ranjan
2019-10-11 13:34     ` Marc Zyngier
2019-10-11 13:40       ` Sai Prakash Ranjan [this message]
2019-10-17 20:00         ` Stephen Boyd
2019-10-18  7:20           ` Marc Zyngier
2019-10-18 14:33             ` Stephen Boyd
2019-10-18 16:40               ` Marc Zyngier
2019-10-18 10:18           ` Sai Prakash Ranjan
2019-10-11 13:33   ` Marc Zyngier
2019-10-11 13:54     ` Mark Rutland
2019-10-11 14:06       ` Marc Zyngier
2019-10-17 21:39       ` Jeremy Linton
2019-10-18  9:01         ` Catalin Marinas

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