linux-kernel - Re: [PATCH v4 04/18] KVM: arm64: selftests: Introduce ARM64_SYS_KVM

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Date:   Thu, 9 Sep 2021 03:02:29 +0000
From:   Oliver Upton <oupton@...gle.com>
To:     Raghavendra Rao Ananta <rananta@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>,
        Andrew Jones <drjones@...hat.com>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Peter Shier <pshier@...gle.com>,
        Ricardo Koller <ricarkol@...gle.com>,
        Reiji Watanabe <reijiw@...gle.com>,
        Jing Zhang <jingzhangos@...gle.com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v4 04/18] KVM: arm64: selftests: Introduce
 ARM64_SYS_KVM_REG

Hi Raghu,

On Thu, Sep 09, 2021 at 01:38:04AM +0000, Raghavendra Rao Ananta wrote:
> With the inclusion of sysreg.h, that brings in system register
> encodings, it would be redundant to re-define register encodings
> again in processor.h to use it with ARM64_SYS_REG for the KVM
> functions such as set_reg() or get_reg(). Hence, add helper macro,
> ARM64_SYS_KVM_REG, that converts SYS_* definitions in sysreg.h
> into ARM64_SYS_REG definitions.
> 
> Signed-off-by: Raghavendra Rao Ananta <rananta@...gle.com>
> ---
>  .../selftests/kvm/include/aarch64/processor.h      | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h
> index bed4ffa70905..ac8b63f8aab7 100644
> --- a/tools/testing/selftests/kvm/include/aarch64/processor.h
> +++ b/tools/testing/selftests/kvm/include/aarch64/processor.h
> @@ -26,6 +26,20 @@
>  
>  #define ID_AA64DFR0_EL1         3, 0,  0, 5, 0
>  
> +/*
> + * ARM64_SYS_KVM_REG(sys_reg_id): Helper macro to convert
> + * SYS_* register definitions in sysreg.h to use in KVM
> + * calls such as get_reg() and set_reg().
> + */
> +#define ARM64_SYS_KVM_REG(sys_reg_id)			\

nit: KVM_ARM64_SYS_REG() perhaps? Dunno which is more readable.

> +({							\
> +	ARM64_SYS_REG(sys_reg_Op0(sys_reg_id),		\
> +			sys_reg_Op1(sys_reg_id),	\
> +			sys_reg_CRn(sys_reg_id),	\
> +			sys_reg_CRm(sys_reg_id),	\
> +			sys_reg_Op2(sys_reg_id));	\
> +})
> +

Could you also switch all current users of ARM64_SYS_REG() in the KVM
selftests directory in this commit? You can also drop the system
register encodings defined in processor.h

--
Thanks,
Oliver