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Re: Fill tlb for data and io address

From: 沈梦姣
Subject: Re: Fill tlb for data and io address
Date: Tue, 16 Feb 2021 22:39:08 +0800

> 在 2021年2月16日,下午7:48,Peter Maydell <peter.maydell@linaro.org> 写道:
> On Tue, 16 Feb 2021 at 11:28, 沈梦姣 <shen.mengjiao3@icloud.com> wrote:
>> Look at the store/load helper, it will use the tlb entry to do the address 
>> translation(from guest virtual address to host virtual address) but where 
>> the tlb is filled for the data ram and io address, I know where the code ram 
>> is filled(tb_find->tb_lookup__cpu_state...)
> The common QEMU code calls the target
Thanks Peter. But what’s the common code? I mean in which case the tlb_fill 
will be triggered, the generated code will trigger or something else? Thanks in 
> CPU tlb_fill function, which tries
> to translate the guest virtual address to a physical address (usually by
> walking the guest page tables). If it succeeds then will update the QEMU
> TLB by calling either tlb_set_page() or tlb_set_page_with_attrs().

> If it
> fails then it arranges to deliver a suitable exception to the guest.
This should be page fault, guest code will update page table, am I right? 
> thanks
> -- PMM

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