Re: [Qemu-devel] Which functions writes to memory?

[Jun Koi <junkoi2004@gmail.com>]

On Fri, Apr 16, 2010 at 3:17 PM, malc <av1474@comtv.ru> wrote:
> On Fri, 16 Apr 2010, Jun Koi wrote:
>
>> Hi,
>>
>> I am writing a small tool to trace all the activities that write to an
>> area of (virtual) memory in Qemu.
>> I am currently doing that by putting my code at the top of the below
>> macro in softmmu_header.h
>>
>> static inline void glue(glue(st, SUFFIX), MEMSUFFIX)....
>>
>> However, it seems I still miss some written events: in some occasions,
>> I believe that Qemu has another code writing data to memory, which
>> happens even before this macro.
>> Is it true that elsewhere, Qemu also writes into memory besides using
>> above function?
>>
>> The memory area I am tracking for written events belong to normal area
>> in OS kernel, where usually only normal code (kernel, not something
>> like SMM handler)  write to.
>
> Once the TLB is properly set up st helpers are bypassed entirely and
> tcg generated code writes to it directly, it's quite easy to "workaround"
> that at the expense of much slower execution.
>

This saves me a lot of frustrated time, thanks!

Now I can see that tcg code calls to __stb*_mmu(), but cannot find any
code call to st*_mmu().
Do you have any hint?

Thanks a lot,
J