* Mapping between Host virtual address and guest physical address
@ 2020-02-13 17:35 Muhui Jiang
2020-02-14 11:31 ` Dr. David Alan Gilbert
0 siblings, 1 reply; 2+ messages in thread
From: Muhui Jiang @ 2020-02-13 17:35 UTC (permalink / raw)
To: qemu-devel
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Dear All
I am recently using qemu-system-arm to boot a linux uImage.
I would like to do some dynamic instrumentation on the uncompressed kernel.
It seems that I need to focus on two key points.
Firstly, I need to know when the kernel is uncompressed, which means the
compression process is finished. By analyzing the vmlinux.elf and the
trace I can figure it out.
Secondly, I need to know where the uncompressed is, which means where the
uncompressed linux kernel (Before translated into tcg) stores in the
virtual address of qemu. Does anyone have ideas? Many Thanks
Regards
Muhui
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* Re: Mapping between Host virtual address and guest physical address
2020-02-13 17:35 Mapping between Host virtual address and guest physical address Muhui Jiang
@ 2020-02-14 11:31 ` Dr. David Alan Gilbert
0 siblings, 0 replies; 2+ messages in thread
From: Dr. David Alan Gilbert @ 2020-02-14 11:31 UTC (permalink / raw)
To: Muhui Jiang; +Cc: qemu-devel
* Muhui Jiang (jiangmuhui@gmail.com) wrote:
> Dear All
>
> I am recently using qemu-system-arm to boot a linux uImage.
>
> I would like to do some dynamic instrumentation on the uncompressed kernel.
> It seems that I need to focus on two key points.
>
> Firstly, I need to know when the kernel is uncompressed, which means the
> compression process is finished. By analyzing the vmlinux.elf and the
> trace I can figure it out.
>
> Secondly, I need to know where the uncompressed is, which means where the
> uncompressed linux kernel (Before translated into tcg) stores in the
> virtual address of qemu. Does anyone have ideas? Many Thanks
There's are some existing HMP monitor commands for this type of
debugging:
gpa2hpa addr -- print the host physical address corresponding to a guest physical address
gpa2hva addr -- print the host virtual address corresponding to a guest physical address
gva2gpa addr -- print the guest physical address corresponding to a guest virtual address
so I think you're saying you want gpa2hva
Dave
> Regards
> Muhui
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
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