linux-kernel - Re: [PATCH v3 5/6] KVM: arm64: rename functions for invariant sys regs

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Date: Wed, 29 May 2024 15:58:45 +0200
From: Eric Auger <eauger@...hat.com>
To: Sebastian Ott <sebott@...hat.com>, linux-arm-kernel@...ts.infradead.org,
 kvmarm@...ts.linux.dev, linux-kernel@...r.kernel.org
Cc: Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>,
 James Morse <james.morse@....com>, Suzuki K Poulose
 <suzuki.poulose@....com>, Catalin Marinas <catalin.marinas@....com>,
 Will Deacon <will@...nel.org>
Subject: Re: [PATCH v3 5/6] KVM: arm64: rename functions for invariant sys
 regs

Hi Sebastian,

On 5/14/24 09:22, Sebastian Ott wrote:
> Invariant system id registers are populated with host values
> at initialization time using their .reset function cb.
get_##reg call read_sysreg(). I don't really understand the above
sentence. Please could you elaborate?

Thanks

Eric
> 
> These are currently called get_* which is usually used by
> the functions implementing the .get_user callback.
> 
> Change their function names to reset_* to reflect what they
> are used for.
> 
> Signed-off-by: Sebastian Ott <sebott@...hat.com>
> ---
>  arch/arm64/kvm/sys_regs.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
> index 1b6ab483e21e..bae72a4ce72b 100644
> --- a/arch/arm64/kvm/sys_regs.c
> +++ b/arch/arm64/kvm/sys_regs.c
> @@ -3795,8 +3795,8 @@ id_to_sys_reg_desc(struct kvm_vcpu *vcpu, u64 id,
>   */
>  
>  #define FUNCTION_INVARIANT(reg)						\
> -	static u64 get_##reg(struct kvm_vcpu *v,			\
> -			      const struct sys_reg_desc *r)		\
> +	static u64 reset_##reg(struct kvm_vcpu *v,			\
> +			       const struct sys_reg_desc *r)		\
>  	{								\
>  		((struct sys_reg_desc *)r)->val = read_sysreg(reg);	\
>  		return ((struct sys_reg_desc *)r)->val;			\
> @@ -3808,9 +3808,9 @@ FUNCTION_INVARIANT(aidr_el1)
>  
>  /* ->val is filled in by kvm_sys_reg_table_init() */
>  static struct sys_reg_desc invariant_sys_regs[] __ro_after_init = {
> -	{ SYS_DESC(SYS_MIDR_EL1), NULL, get_midr_el1 },
> -	{ SYS_DESC(SYS_REVIDR_EL1), NULL, get_revidr_el1 },
> -	{ SYS_DESC(SYS_AIDR_EL1), NULL, get_aidr_el1 },
> +	{ SYS_DESC(SYS_MIDR_EL1), NULL, reset_midr_el1 },
> +	{ SYS_DESC(SYS_REVIDR_EL1), NULL, reset_revidr_el1 },
> +	{ SYS_DESC(SYS_AIDR_EL1), NULL, reset_aidr_el1 },
>  };
>  
>  static int get_invariant_sys_reg(u64 id, u64 __user *uaddr)