Re: [Qemu-devel] [PATCH v5 2/3] softmmu: Add probe_write()

["Andreas Färber" <afaerber@suse.de>]

Am 26.05.2015 um 18:49 schrieb Yongbok Kim:
> Add probe_write() forces a tlb_fill if the specified guest virtual
> index isn't in the TCG softmmu TLB.
> 
> Signed-off-by: Yongbok Kim <yongbok.kim@imgtec.com>
> ---
>  include/exec/exec-all.h |    2 ++
>  softmmu_template.h      |   20 ++++++++++++++++++++
>  2 files changed, 22 insertions(+), 0 deletions(-)
> 
> diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
> index b58cd47..af51203 100644
> --- a/include/exec/exec-all.h
> +++ b/include/exec/exec-all.h
> @@ -109,6 +109,8 @@ void tlb_set_page_with_attrs(CPUState *cpu, target_ulong vaddr,
>                               hwaddr paddr, MemTxAttrs attrs,
>                               int prot, int mmu_idx, target_ulong size);
>  void tb_invalidate_phys_addr(AddressSpace *as, hwaddr addr);
> +void probe_write(CPUArchState *env, target_ulong addr, int mmu_idx,
> +                 uintptr_t retaddr);
>  #else
>  static inline void tlb_flush_page(CPUState *cpu, target_ulong addr)
>  {
> diff --git a/softmmu_template.h b/softmmu_template.h
> index 9cb1659..1a1de4a 100644
> --- a/softmmu_template.h
> +++ b/softmmu_template.h
> @@ -548,6 +548,26 @@ glue(glue(helper_st, SUFFIX), MMUSUFFIX)(CPUArchState *env, target_ulong addr,
>      helper_te_st_name(env, addr, val, oi, GETRA());
>  }
>  
> +#if DATA_SIZE == 1
> +/*
> + * Force a tlb_fill if the specified guest virtual index isn't in the TCG
> + * softmmu TLB.
> + */
> +void probe_write(CPUArchState *env, target_ulong addr, int mmu_idx,
> +                 uintptr_t retaddr)
> +{
> +    int index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
> +    target_ulong tlb_addr = env->tlb_table[mmu_idx][index].addr_write;
> +
> +    if ((addr & TARGET_PAGE_MASK)
> +        != (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
> +        /* TLB entry is for a different page */
> +        if (!VICTIM_TLB_HIT(addr_write)) {
> +            tlb_fill(ENV_GET_CPU(env), addr, MMU_DATA_STORE, mmu_idx, retaddr);

Isn't the use of ENV_GET_CPU() here contradicting Peter C.'s series?

Regards,
Andreas

> +        }
> +    }
> +}
> +#endif
>  #endif /* !defined(SOFTMMU_CODE_ACCESS) */
>  
>  #undef READ_ACCESS_TYPE

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