[PATCH 2/2] KVM: PPC: Book3S HV: lockless tlbie for HPT hcalls

[Michael Ellerman]

Nicholas Piggin <npiggin at gmail.com> writes:
> diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c
> index 78e6a392330f..0221a0f74f07 100644
> --- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c
> +++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c
> @@ -439,6 +439,9 @@ static inline int try_lock_tlbie(unsigned int *lock)
>  	unsigned int tmp, old;
>  	unsigned int token = LOCK_TOKEN;
>  
> +	if (mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE))
> +		return 1;
> +
>  	asm volatile("1:lwarx	%1,0,%2\n"
>  		     "	cmpwi	cr0,%1,0\n"
>  		     "	bne	2f\n"
> @@ -452,6 +455,12 @@ static inline int try_lock_tlbie(unsigned int *lock)
>  	return old == 0;
>  }
>  
> +static inline void unlock_tlbie_after_sync(unsigned int *lock)
> +{
> +	if (mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE))
> +		return;
> +}

So this is a bit hard to follow:

#define MMU_FTRS_DEFAULT_HPTE_ARCH_V2	\
	MMU_FTR_HPTE_TABLE | MMU_FTR_PPCAS_ARCH_V2
#define MMU_FTRS_POWER		MMU_FTRS_DEFAULT_HPTE_ARCH_V2
#define MMU_FTRS_PPC970		MMU_FTRS_POWER | MMU_FTR_TLBIE_CROP_VA			// does NOT
#define MMU_FTRS_POWER5		MMU_FTRS_POWER | MMU_FTR_LOCKLESS_TLBIE
#define MMU_FTRS_POWER6		MMU_FTRS_POWER5 | MMU_FTR_KERNEL_RO | MMU_FTR_68_BIT_VA	// includes lockless TLBIE
#define MMU_FTRS_POWER7		MMU_FTRS_POWER6						// includes lockless TLBIE
#define MMU_FTRS_POWER8		MMU_FTRS_POWER6						// includes lockless TLBIE
#define MMU_FTRS_POWER9		MMU_FTRS_POWER6						// includes lockless TLBIE
#define MMU_FTRS_CELL		MMU_FTRS_DEFAULT_HPTE_ARCH_V2 | 			// does NOT
				MMU_FTR_CI_LARGE_PAGE
#define MMU_FTRS_PA6T		MMU_FTRS_DEFAULT_HPTE_ARCH_V2 | \			// does NOT
				MMU_FTR_CI_LARGE_PAGE | MMU_FTR_NO_SLBIE_B


So it's only 970, Cell and Pasemi that *don't* have lockless TLBIE.

And KVM HV doesn't doesn't run on any of those.

So we can just not check for the feature in the KVM HV code.

Am I right?

cheers