linux-kernel - Re: [PATCH v3 4/9] tools: riscv: Add header file csr.h

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Date:   Thu, 14 Sep 2023 10:14:05 +0200
From:   Andrew Jones <ajones@...tanamicro.com>
To:     Haibo Xu <haibo1.xu@...el.com>
Cc:     xiaobo55x@...il.com, Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Shuah Khan <shuah@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...shpatra.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Ricardo Koller <ricarkol@...gle.com>,
        Vishal Annapurve <vannapurve@...gle.com>,
        Vipin Sharma <vipinsh@...gle.com>,
        David Matlack <dmatlack@...gle.com>,
        Thomas Huth <thuth@...hat.com>,
        Aaron Lewis <aaronlewis@...gle.com>,
        Colton Lewis <coltonlewis@...gle.com>,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        kvm@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        kvm-riscv@...ts.infradead.org
Subject: Re: [PATCH v3 4/9] tools: riscv: Add header file csr.h

On Thu, Sep 14, 2023 at 09:36:58AM +0800, Haibo Xu wrote:
> Borrow the csr definitions and operations from kernel's
> arch/riscv/include/asm/csr.h to tools/ for riscv. Since
> only 64bit was supported for RISC-V KVM selftests, add
> CONFIG_64BIT definition in kvm/Makefile to ensure only
> 64bit registers were available in csr.h.
> 
> Suggested-by: Andrew Jones <ajones@...tanamicro.com>
> Signed-off-by: Haibo Xu <haibo1.xu@...el.com>
> Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
> ---
>  tools/arch/riscv/include/asm/csr.h   | 521 +++++++++++++++++++++++++++
>  tools/testing/selftests/kvm/Makefile |   3 +
>  2 files changed, 524 insertions(+)
>  create mode 100644 tools/arch/riscv/include/asm/csr.h
> 
> diff --git a/tools/arch/riscv/include/asm/csr.h b/tools/arch/riscv/include/asm/csr.h
> new file mode 100644
> index 000000000000..4e86c82aacbd
> --- /dev/null
> +++ b/tools/arch/riscv/include/asm/csr.h
...
> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> index 0102a0297b84..89ecee2fdb73 100644
> --- a/tools/testing/selftests/kvm/Makefile
> +++ b/tools/testing/selftests/kvm/Makefile
> @@ -222,6 +222,9 @@ CFLAGS += -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 \
>  ifeq ($(ARCH),s390)
>  	CFLAGS += -march=z10
>  endif
> +ifeq ($(ARCH),riscv)
> +	CFLAGS += -DCONFIG_64BIT
> +endif

This should be a separate patch, since the "import csr.h to tools" should
be completely separate from anything else. Also, all architectures that
KVM selftests supports are 64-bit, so, as another completely separate
patch, I think we should just add CONFIG_64BIT to CFLAGS for all builds,
especially since there's a chance some of the includes the other
architectures are using may need it. Of course we'll need sign-off and
testing from the other arch maintainers.

Thanks,
drew