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From: Stephen Boyd <swboyd@chromium.org>
To: Marc Zyngier <maz@kernel.org>,
	Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.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, marc.w.gonzalez@free.fr
Subject: Re: Relax CPU features sanity checking on heterogeneous architectures
Date: Thu, 17 Oct 2019 13:00:39 -0700
Message-ID: <5da8c868.1c69fb81.ae709.97ff@mx.google.com> (raw)
In-Reply-To: <ac7599b30461d6a814e4f36d68bba6c2@codeaurora.org>

Quoting Sai Prakash Ranjan (2019-10-11 06:40:13)
> 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.
> 

I want KVM on sc7180. How do I get it? Is something going to not work?


  reply index

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
2019-10-17 20:00         ` Stephen Boyd [this message]
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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