linux-kernel - Re: [PATCH v1 04/13] arm64: mm: Push __TLBI_VADDR() into __tlbi

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Message-ID: <aVtNkqIKbqIpn-Xx@a079125.arm.com>
Date: Mon, 5 Jan 2026 11:05:14 +0530
From: Linu Cherian <linu.cherian@....com>
To: Ryan Roberts <ryan.roberts@....com>
Cc: Will Deacon <will@...nel.org>, Ard Biesheuvel <ardb@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Mark Rutland <mark.rutland@....com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Marc Zyngier <maz@...nel.org>, Dev Jain <dev.jain@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 04/13] arm64: mm: Push __TLBI_VADDR() into
 __tlbi_level()

On Tue, Dec 16, 2025 at 02:45:49PM +0000, Ryan Roberts wrote:
> From: Will Deacon <will@...nel.org>
> 
> The __TLBI_VADDR() macro takes an ASID and an address and converts them
> into a single argument formatted correctly for a TLB invalidation
> instruction.
> 
> Rather than have callers worry about this (especially in the case where
> the ASID is zero), push the macro down into __tlbi_level() via a new
> __tlbi_level_asid() helper.
> 
> Signed-off-by: Will Deacon <will@...nel.org>
> Signed-off-by: Ryan Roberts <ryan.roberts@....com>
> ---
>  arch/arm64/include/asm/tlbflush.h | 14 ++++++++++----
>  arch/arm64/kernel/sys_compat.c    |  2 +-
>  arch/arm64/kvm/hyp/nvhe/mm.c      |  2 +-
>  arch/arm64/kvm/hyp/pgtable.c      |  4 ++--
>  4 files changed, 14 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h
> index 31f43d953ce2..39717f98c31e 100644
> --- a/arch/arm64/include/asm/tlbflush.h
> +++ b/arch/arm64/include/asm/tlbflush.h
> @@ -150,9 +150,10 @@ static __always_inline void ipas2e1is(u64 arg)
>  	__tlbi(ipas2e1is, arg);
>  }
>  
> -static __always_inline void __tlbi_level(tlbi_op op, u64 addr, u32 level)
> +static __always_inline void __tlbi_level_asid(tlbi_op op, u64 addr, u32 level,
> +					      u16 asid)
>  {
> -	u64 arg = addr;
> +	u64 arg = __TLBI_VADDR(addr, asid);
>  
>  	if (alternative_has_cap_unlikely(ARM64_HAS_ARMv8_4_TTL) && level <= 3) {
>  		u64 ttl = level | (get_trans_granule() << 2);
> @@ -164,6 +165,11 @@ static __always_inline void __tlbi_level(tlbi_op op, u64 addr, u32 level)
>  	op(arg);
>  }
>  
> +static inline void __tlbi_level(tlbi_op op, u64 addr, u32 level)
> +{
> +	__tlbi_level_asid(op, addr, level, 0);
> +}
> +
>  /*
>   * This macro creates a properly formatted VA operand for the TLB RANGE. The
>   * value bit assignments are:
> @@ -501,8 +507,7 @@ do {									\
>  		if (!system_supports_tlb_range() ||			\
>  		    __flush_pages == 1 ||				\
>  		    (lpa2 && __flush_start != ALIGN(__flush_start, SZ_64K))) {	\
> -			addr = __TLBI_VADDR(__flush_start, asid);	\
> -			__tlbi_level(op, addr, tlb_level);		\
> +			__tlbi_level_asid(op, __flush_start, tlb_level, asid);	\
>  			__flush_start += stride;			\
>  			__flush_pages -= stride >> PAGE_SHIFT;		\
>  			continue;					\
> @@ -675,5 +680,6 @@ static inline bool huge_pmd_needs_flush(pmd_t oldpmd, pmd_t newpmd)
>  #define huge_pmd_needs_flush huge_pmd_needs_flush
>  
>  #undef __tlbi_user
> +#undef __TLBI_VADDR
>  #endif
>  #endif
> diff --git a/arch/arm64/kernel/sys_compat.c b/arch/arm64/kernel/sys_compat.c
> index 4a609e9b65de..ad4857df4830 100644
> --- a/arch/arm64/kernel/sys_compat.c
> +++ b/arch/arm64/kernel/sys_compat.c
> @@ -36,7 +36,7 @@ __do_compat_cache_op(unsigned long start, unsigned long end)
>  			 * The workaround requires an inner-shareable tlbi.
>  			 * We pick the reserved-ASID to minimise the impact.
>  			 */
> -			__tlbi(aside1is, __TLBI_VADDR(0, 0));
> +			__tlbi(aside1is, 0UL);
>  			dsb(ish);
>  		}
>  
> diff --git a/arch/arm64/kvm/hyp/nvhe/mm.c b/arch/arm64/kvm/hyp/nvhe/mm.c
> index ae8391baebc3..581385b21826 100644
> --- a/arch/arm64/kvm/hyp/nvhe/mm.c
> +++ b/arch/arm64/kvm/hyp/nvhe/mm.c
> @@ -270,7 +270,7 @@ static void fixmap_clear_slot(struct hyp_fixmap_slot *slot)
>  	 * https://lore.kernel.org/kvm/20221017115209.2099-1-will@kernel.org/T/#mf10dfbaf1eaef9274c581b81c53758918c1d0f03
>  	 */
>  	dsb(ishst);
> -	__tlbi_level(vale2is, __TLBI_VADDR(addr, 0), level);
> +	__tlbi_level(vale2is, addr, level);
>  	dsb(ish);
>  	isb();
>  }
> diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
> index 947ac1a951a5..9292c569afe6 100644
> --- a/arch/arm64/kvm/hyp/pgtable.c
> +++ b/arch/arm64/kvm/hyp/pgtable.c
> @@ -472,14 +472,14 @@ static int hyp_unmap_walker(const struct kvm_pgtable_visit_ctx *ctx,
>  
>  		kvm_clear_pte(ctx->ptep);
>  		dsb(ishst);
> -		__tlbi_level(vae2is, __TLBI_VADDR(ctx->addr, 0), TLBI_TTL_UNKNOWN);
> +		__tlbi_level(vae2is, ctx->addr, TLBI_TTL_UNKNOWN);
>  	} else {
>  		if (ctx->end - ctx->addr < granule)
>  			return -EINVAL;
>  
>  		kvm_clear_pte(ctx->ptep);
>  		dsb(ishst);
> -		__tlbi_level(vale2is, __TLBI_VADDR(ctx->addr, 0), ctx->level);
> +		__tlbi_level(vale2is, ctx->addr, ctx->level);
>  		*unmapped += granule;
>  	}
>  
> -- 
> 2.43.0
> 


Reviewed-by: Linu Cherian <linu.cherian@....com>