[Crash-utility] 答复: 答复: [PATCH] x86_64: vtop supports 1G huge pages

[Li,Rongqing]

> -----Original Message-----
> > > > Crash utility currently does not supporting virtual to physical
> > > > address translation for 1G huge pages on x86_64, This patch tries
> > > > to address this issue by providing address translation support for
> > > > huge pages in 'vtop' command.
> > >
> > > Good catch!  I think it would be better to add the same behavior
> > > also to x86_64_kvtop().  Could you do it?
> > >
> > > Thanks,
> > > Kazu
> > >
> >
> > Yes, I can. But how should I test?
> 
> You can get the kernel virtual address corresponding to the physical address of
> a user virtual address with ptov command, and then do vtop again the kernel
> virtual address.  For example:
> 
> crash.1Ghuge> vtop 7f4780000000
> VIRTUAL     PHYSICAL
> 7f4780000000  1a00000000
> 
>    PGD: 2fa32e47f0 => 8000002fb2f30067
>    PUD: 2fb2f308f0 => 8000001a000008e7
>   PAGE: 1a00000000  (1GB)
> ...
> crash.1Ghuge> ptov 1a00000000
> VIRTUAL           PHYSICAL
> ffff8fe580000000  1a00000000
> crash.1Ghuge> vtop ffff8fe580000000
> VIRTUAL           PHYSICAL
> ffff8fe580000000  1a00000000
> 
> PGD DIRECTORY: ffffffff92c0a000
> PAGE DIRECTORY: 18b2001067
>    PUD: 18b2001cb0 => 8000001a000001e3
>    PMD: 1a00000000 => 706050403020100  <<-- should print "(1GB)" and
> PTE info
> 
>       PAGE         PHYSICAL      MAPPING       INDEX CNT FLAGS
> fffffa1aa8000000 1a00000000 ffff8ffb525d0cb9        0  1 57ffffc001000c
> uptodate,dirty,head
> 
> Thanks,
> Kazu
> 

Thanks very much, I will send V2


-Li

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