RE: [PATCH, RESEND] x86/mtrr: Rename mtrr_overwrite_state() to guest_force_mtrr_state()

[Michael Kelley]

From: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> Sent: Sunday, December 1, 2024 11:32 PM
> 
> Rename the helper to better reflect its function.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
> Suggested-by: Dave Hansen <dave.hansen@xxxxxxxxx>
> Acked-by: Dave Hansen <dave.hansen@xxxxxxxxx>

FWIW, I previously gave my "Reviewed-by" on this patch [1].
I didn't call it out explicitly, but did so for the patch in general
as well as specifically for the Hyper-V related change.

Michael

[1]: https://lore.kernel.org/linux-hyperv/SN6PR02MB4157C91EE70F4EF4B6EDDE46D4412@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/

> ---
>  arch/x86/hyperv/ivm.c              |  2 +-
>  arch/x86/include/asm/mtrr.h        | 10 +++++-----
>  arch/x86/kernel/cpu/mtrr/generic.c |  6 +++---
>  arch/x86/kernel/cpu/mtrr/mtrr.c    |  2 +-
>  arch/x86/kernel/kvm.c              |  2 +-
>  arch/x86/xen/enlighten_pv.c        |  4 ++--
>  6 files changed, 13 insertions(+), 13 deletions(-)
> 
> diff --git a/arch/x86/hyperv/ivm.c b/arch/x86/hyperv/ivm.c
> index 60fc3ed72830..90aabe1fd3b6 100644
> --- a/arch/x86/hyperv/ivm.c
> +++ b/arch/x86/hyperv/ivm.c
> @@ -664,7 +664,7 @@ void __init hv_vtom_init(void)
>  	x86_platform.guest.enc_status_change_finish = hv_vtom_set_host_visibility;
> 
>  	/* Set WB as the default cache mode. */
> -	mtrr_overwrite_state(NULL, 0, MTRR_TYPE_WRBACK);
> +	guest_force_mtrr_state(NULL, 0, MTRR_TYPE_WRBACK);
>  }
> 
>  #endif /* defined(CONFIG_AMD_MEM_ENCRYPT) ||
> defined(CONFIG_INTEL_TDX_GUEST) */
> diff --git a/arch/x86/include/asm/mtrr.h b/arch/x86/include/asm/mtrr.h
> index 4218248083d9..c69e269937c5 100644
> --- a/arch/x86/include/asm/mtrr.h
> +++ b/arch/x86/include/asm/mtrr.h
> @@ -58,8 +58,8 @@ struct mtrr_state_type {
>   */
>  # ifdef CONFIG_MTRR
>  void mtrr_bp_init(void);
> -void mtrr_overwrite_state(struct mtrr_var_range *var, unsigned int num_var,
> -			  mtrr_type def_type);
> +void guest_force_mtrr_state(struct mtrr_var_range *var, unsigned int num_var,
> +			    mtrr_type def_type);
>  extern u8 mtrr_type_lookup(u64 addr, u64 end, u8 *uniform);
>  extern void mtrr_save_fixed_ranges(void *);
>  extern void mtrr_save_state(void);
> @@ -75,9 +75,9 @@ void mtrr_disable(void);
>  void mtrr_enable(void);
>  void mtrr_generic_set_state(void);
>  #  else
> -static inline void mtrr_overwrite_state(struct mtrr_var_range *var,
> -					unsigned int num_var,
> -					mtrr_type def_type)
> +static inline void guest_force_mtrr_state(struct mtrr_var_range *var,
> +					  unsigned int num_var,
> +					  mtrr_type def_type)
>  {
>  }
> 
> diff --git a/arch/x86/kernel/cpu/mtrr/generic.c b/arch/x86/kernel/cpu/mtrr/generic.c
> index 7b29ebda024f..2fdfda2b60e4 100644
> --- a/arch/x86/kernel/cpu/mtrr/generic.c
> +++ b/arch/x86/kernel/cpu/mtrr/generic.c
> @@ -423,7 +423,7 @@ void __init mtrr_copy_map(void)
>  }
> 
>  /**
> - * mtrr_overwrite_state - set static MTRR state
> + * guest_force_mtrr_state - set static MTRR state for a guest
>   *
>   * Used to set MTRR state via different means (e.g. with data obtained from
>   * a hypervisor).
> @@ -436,8 +436,8 @@ void __init mtrr_copy_map(void)
>   * @num_var: length of the @var array
>   * @def_type: default caching type
>   */
> -void mtrr_overwrite_state(struct mtrr_var_range *var, unsigned int num_var,
> -			  mtrr_type def_type)
> +void guest_force_mtrr_state(struct mtrr_var_range *var, unsigned int num_var,
> +			    mtrr_type def_type)
>  {
>  	unsigned int i;
> 
> diff --git a/arch/x86/kernel/cpu/mtrr/mtrr.c b/arch/x86/kernel/cpu/mtrr/mtrr.c
> index 989d368be04f..ecbda0341a8a 100644
> --- a/arch/x86/kernel/cpu/mtrr/mtrr.c
> +++ b/arch/x86/kernel/cpu/mtrr/mtrr.c
> @@ -625,7 +625,7 @@ void mtrr_save_state(void)
>  static int __init mtrr_init_finalize(void)
>  {
>  	/*
> -	 * Map might exist if mtrr_overwrite_state() has been called or if
> +	 * Map might exist if guest_force_mtrr_state() has been called or if
>  	 * mtrr_enabled() returns true.
>  	 */
>  	mtrr_copy_map();
> diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
> index 21e9e4845354..7a422a6c5983 100644
> --- a/arch/x86/kernel/kvm.c
> +++ b/arch/x86/kernel/kvm.c
> @@ -983,7 +983,7 @@ static void __init kvm_init_platform(void)
>  	x86_platform.apic_post_init = kvm_apic_init;
> 
>  	/* Set WB as the default cache mode for SEV-SNP and TDX */
> -	mtrr_overwrite_state(NULL, 0, MTRR_TYPE_WRBACK);
> +	guest_force_mtrr_state(NULL, 0, MTRR_TYPE_WRBACK);
>  }
> 
>  #if defined(CONFIG_AMD_MEM_ENCRYPT)
> diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
> index d6818c6cafda..633469fab536 100644
> --- a/arch/x86/xen/enlighten_pv.c
> +++ b/arch/x86/xen/enlighten_pv.c
> @@ -171,7 +171,7 @@ static void __init xen_set_mtrr_data(void)
> 
>  	/* Only overwrite MTRR state if any MTRR could be got from Xen. */
>  	if (reg)
> -		mtrr_overwrite_state(var, reg, MTRR_TYPE_UNCACHABLE);
> +		guest_force_mtrr_state(var, reg, MTRR_TYPE_UNCACHABLE);
>  #endif
>  }
> 
> @@ -195,7 +195,7 @@ static void __init xen_pv_init_platform(void)
>  	if (xen_initial_domain())
>  		xen_set_mtrr_data();
>  	else
> -		mtrr_overwrite_state(NULL, 0, MTRR_TYPE_WRBACK);
> +		guest_force_mtrr_state(NULL, 0, MTRR_TYPE_WRBACK);
> 
>  	/* Adjust nr_cpu_ids before "enumeration" happens */
>  	xen_smp_count_cpus();
> --
> 2.45.2
>