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Re: [Qemu-arm] [Qemu-devel] [PATCH v5] target/arm: generate a custom MID
From: |
Richard Henderson |
Subject: |
Re: [Qemu-arm] [Qemu-devel] [PATCH v5] target/arm: generate a custom MIDR for -cpu max |
Date: |
Fri, 26 Jul 2019 08:12:44 -0700 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 |
On 7/26/19 4:39 AM, Alex Bennée wrote:
> While most features are now detected by probing the ID_* registers
> kernels can (and do) use MIDR_EL1 for working out of they have to
> apply errata. This can trip up warnings in the kernel as it tries to
> work out if it should apply workarounds to features that don't
> actually exist in the reported CPU type.
>
> Avoid this problem by synthesising our own MIDR value.
>
> Signed-off-by: Alex Bennée <address@hidden>
> Reviewed-by: Peter Maydell <address@hidden>
>
> ---
> v2
> - don't leak QEMU version into ID reg
> v3
> - move comment into one block
> - explicit setting of more fields
> v4
> - minor reword of comment
> v5
> - VARIANT->PARTNUM and extra words
> ---
> target/arm/cpu.h | 6 ++++++
> target/arm/cpu64.c | 19 +++++++++++++++++++
> 2 files changed, 25 insertions(+)
Reviewed-by: Richard Henderson <address@hidden>
r~