[Qemu-devel] MMU and Physical<->Virtual address conversion

[Qemu-devel] MMU and Physical<->Virtual address conversion

[Shane Hummer-Smith]

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Hello,

I am trying to experiment with the memory management unit in QEMU, but I
don't seem to be able to wrap my head around the source code. Can somebody
help me figure out how the physical to virtual address translation and
vice-versa is implemented in QEMU? Any pointer would be appreciated. Thanks
much!

--S

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Re: [Qemu-devel] MMU and Physical<->Virtual address conversion

[amateur]

On Thu, Jun 21, 2007 at 12:10:38AM -0700, Shane Hummer-Smith wrote:
> Hello,
> 
> I am trying to experiment with the memory management unit in QEMU, but I
> don't seem to be able to wrap my head around the source code. Can somebody
> help me figure out how the physical to virtual address translation and
> vice-versa is implemented in QEMU? Any pointer would be appreciated. Thanks
> much!
-------------------------
The address translation things in full system mode is handled by the
so called SoftMMU, which translate gVA->hEA. gEA->gVA is known as
address calculation and handled in insn translation. gVA->gPA is
handled by SoftMMU using Guest Page Table, gPA->hEA is handled by
SoftMMU using two-level-table of PhyPageDesc structures. There is
again TLB which translate gVA->hEA directly.

SoftMMU code is mainly in softmmu_header.h, softmmu_template.h, things
related to PhyPageDesc...

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