linux-kernel - Re: [PATCH 1/2] KVM: selftests: arm64: Simplify specification of filtered registers

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Message-ID: <87r0b44jk3.wl-maz@kernel.org>
Date: Sun, 04 Aug 2024 12:24:44 +0100
From: Marc Zyngier <maz@...nel.org>
To: Mark Brown <broonie@...nel.org>
Cc: Oliver Upton <oliver.upton@...ux.dev>,
	James Morse <james.morse@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Shuah Khan <shuah@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Joey Gouly <joey.gouly@....com>,
	linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.linux.dev,
	kvm@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] KVM: selftests: arm64: Simplify specification of filtered registers

On Fri, 02 Aug 2024 22:57:53 +0100,
Mark Brown <broonie@...nel.org> wrote:
> 
> Since we already import the generated sysreg definitions from the main
> kernel and reference them in processor.h for use in other KVM tests we
> can also make use of them for get-reg-list as well instead of having hard
> coded magic numbers in the program. Do this for the table defining which
> registers should be gated on ID register values, using a macro which allows
> us to specify the register and ID register field in a much more compact
> and direct fashion.
> 
> In the process we fix the ID register checked for S1PIE specific registers
> which was using an incorrect shift of 4, checking SCTLRX support instead.
> No other change is seen in the generated data.
> 
> Fixes: 5f0419a0083b ("KVM: selftests: get-reg-list: add Permission Indirection registers")
> Signed-off-by: Mark Brown <broonie@...nel.org>
> ---
>  tools/testing/selftests/kvm/aarch64/get-reg-list.c | 29 ++++++++--------------
>  1 file changed, 11 insertions(+), 18 deletions(-)
> 
> diff --git a/tools/testing/selftests/kvm/aarch64/get-reg-list.c b/tools/testing/selftests/kvm/aarch64/get-reg-list.c
> index 709d7d721760..a00322970578 100644
> --- a/tools/testing/selftests/kvm/aarch64/get-reg-list.c
> +++ b/tools/testing/selftests/kvm/aarch64/get-reg-list.c
> @@ -22,25 +22,18 @@ struct feature_id_reg {
>  	__u64 feat_min;
>  };
>  
> -static struct feature_id_reg feat_id_regs[] = {
> -	{
> -		ARM64_SYS_REG(3, 0, 2, 0, 3),	/* TCR2_EL1 */
> -		ARM64_SYS_REG(3, 0, 0, 7, 3),	/* ID_AA64MMFR3_EL1 */
> -		0,
> -		1
> -	},
> -	{
> -		ARM64_SYS_REG(3, 0, 10, 2, 2),	/* PIRE0_EL1 */
> -		ARM64_SYS_REG(3, 0, 0, 7, 3),	/* ID_AA64MMFR3_EL1 */
> -		4,
> -		1
> -	},
> -	{
> -		ARM64_SYS_REG(3, 0, 10, 2, 3),	/* PIR_EL1 */
> -		ARM64_SYS_REG(3, 0, 0, 7, 3),	/* ID_AA64MMFR3_EL1 */
> -		4,
> -		1
> +#define FEAT_ID_CHECK(reg, id_reg, id_field, id_val)	\
> +	{						\
> +		KVM_ARM64_SYS_REG(SYS_##reg),		\
> +		KVM_ARM64_SYS_REG(SYS_##id_reg),	\
> +		id_reg##_##id_field##_SHIFT,		\
> +		id_reg##_##id_field##_##id_val,		\

Please use designated initialisers.

>  	}
> +
> +static struct feature_id_reg feat_id_regs[] = {
> +	FEAT_ID_CHECK(TCR2_EL1, ID_AA64MMFR3_EL1, TCRX, IMP),
> +	FEAT_ID_CHECK(PIRE0_EL1, ID_AA64MMFR3_EL1, S1PIE, IMP),
> +	FEAT_ID_CHECK(PIR_EL1, ID_AA64MMFR3_EL1, S1PIE, IMP),
>  };
>  
>  bool filter_reg(__u64 reg)

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.