Re: [Qemu-devel] [kvm-unit-tests PATCH v5 06/11] lib/arm: add flush_tlb_page mmu function

[Andrew Jones <drjones@redhat.com>]

On Fri, Jul 31, 2015 at 04:53:56PM +0100, Alex Bennée wrote:
> This introduces a new flush_tlb_page function which does exactly what
> you expect. It's going to be useful for the future TLB torture test.
> 
> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
> ---
>  lib/arm/asm/mmu.h   | 11 +++++++++++
>  lib/arm64/asm/mmu.h |  8 ++++++++
>  2 files changed, 19 insertions(+)
> 
> diff --git a/lib/arm/asm/mmu.h b/lib/arm/asm/mmu.h
> index c1bd01c..2bb0cde 100644
> --- a/lib/arm/asm/mmu.h
> +++ b/lib/arm/asm/mmu.h
> @@ -14,8 +14,11 @@
>  #define PTE_AF			PTE_EXT_AF
>  #define PTE_WBWA		L_PTE_MT_WRITEALLOC
>  
> +/* See B3.18.7 TLB maintenance operations */
> +
>  static inline void local_flush_tlb_all(void)
>  {
> +	/* TLBIALL */
>  	asm volatile("mcr p15, 0, %0, c8, c7, 0" :: "r" (0));
>  	dsb();
>  	isb();
> @@ -27,6 +30,14 @@ static inline void flush_tlb_all(void)
>  	local_flush_tlb_all();
>  }
>  
> +static inline void flush_tlb_page(unsigned long vaddr)
> +{
> +	/* TLBIMVAA */
> +	asm volatile("mcr p15, 0, %0, c8, c7, 3" :: "r" (vaddr));
> +	dsb();
> +	isb();
> +}
> +
>  #include <asm/mmu-api.h>
>  
>  #endif /* __ASMARM_MMU_H_ */
> diff --git a/lib/arm64/asm/mmu.h b/lib/arm64/asm/mmu.h
> index 18b4d6b..3bc31c9 100644
> --- a/lib/arm64/asm/mmu.h
> +++ b/lib/arm64/asm/mmu.h
> @@ -19,6 +19,14 @@ static inline void flush_tlb_all(void)
>  	isb();
>  }
>  
> +static inline void flush_tlb_page(unsigned long vaddr)
> +{
> +	unsigned long page = vaddr >> 12;
> +	dsb(ishst);
> +	asm("tlbi	vaae1is, %0" :: "r" (page));
> +	dsb(ish);
> +}
> +
>  #include <asm/mmu-api.h>
>  
>  #endif /* __ASMARM64_MMU_H_ */
> -- 
> 2.5.0
> 
>

Reviewed-by: Andrew Jones <drjones@redhat.com>