Messages in this thread | | | Date | Fri, 18 Oct 2019 15:48:43 +0530 | From | Sai Prakash Ranjan <> | Subject | Re: Relax CPU features sanity checking on heterogeneous architectures |
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On 2019-10-18 01:30, Stephen Boyd wrote: > 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?
I meant KVM is not supported for downstream android case where we do not have kernel booting from EL2. And obviously I am wrong because SC7180 is not for android, so my bad. I think Mark R's question about handling KVM variation was for Marc Z not me :p
As for something not going to work, as Mark said this warning does indicate that 32 bit EL1 guests won't be able to run on big CPU cores.
- Sai
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