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arm64 disable some feature bit of ID_AA64ISAR0_EL1


From: Jiatong Shen
Subject: arm64 disable some feature bit of ID_AA64ISAR0_EL1
Date: Wed, 17 May 2023 10:22:45 +0800

Hello community Experts!

    I am doing some experiments with arm64 host machine. The host machine is kunpeng 920 5251k. I try to boot a virtual machine with the following command:

qemu-system-aarch64 -cpu cortex-a53 -enable-kvm -smp 1 -m 4096 -M virt,gic-version=3

Here I have modified the code, and change kvm_target from QEMU_KVM_ARM_TARGET_CORTEX_A53 to 5(generic arm  v8).

when the vm boots, I try to use lscpu, but I still saw some feature flags like atomics exist.

So my question is how can I modify aa64isar0 register correctly? Thank you very much for the generous support!

--

Best Regards,

Jiatong Shen

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