From: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
To: Marc Zyngier <maz@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
linux-arm-msm-owner@vger.kernel.org, rnayak@codeaurora.org,
suzuki.poulose@arm.com, catalin.marinas@arm.com,
linux-arm-kernel <linux-arm-kernel-bounces@lists.infradead.org>,
marc.w.gonzalez@free.fr, 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
Subject: Re: Relax CPU features sanity checking on heterogeneous architectures
Date: Fri, 11 Oct 2019 19:10:13 +0530 [thread overview]
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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next prev parent reply other threads:[~2019-10-11 13:40 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-11 5:49 Relax CPU features sanity checking on heterogeneous architectures 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
2020-01-20 2:47 ` Sai Prakash Ranjan
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