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