Re: how to map a host virtual address (hva) to guest address space (gva/gpa/gfn)

[sheng qiu]

Thanks Mehul.

On Tue, Jun 19, 2012 at 7:33 PM, Mehul Chadha <mehulc87@xxxxxxxxx> wrote:
> On Tue, Jun 19, 2012 at 6:09 PM, sheng qiu <herbert1984106@xxxxxxxxx> wrote:
>> Hi all,
>>
>> is there any existing function in KVM that can map a host virtual
>> address (hva) to the guest address space. So that the guest VM can
>> access it.
>> i.e. translate hva to a gpa or gva or gfn, so the guest VM can use
>> that converted address to access?
> I am not aware of a function that exists in kvm, but you can write one using
> __gfn_to_memslot()  as a reference implementation.
>
> you can check if the hva falls in a particular memslot using
> userspace_addr member
> of the memslot structure, and then calculate the corresponding gfn from that.
>>
>> Thanks,
>> Sheng
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-- 
Sheng Qiu
Texas A & M University
Room 332B Wisenbaker
email: herbert1984106@xxxxxxxxx
College Station, TX 77843-3259
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