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

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Message-ID: <CAB7xdinRiNhNkCAm2Sf+rAwMA+P4uWcoYJhrb=aDhJ9zAFdLzw@mail.gmail.com>
Date:	Wed, 20 Jun 2012 09:28:49 -0500
From:	sheng qiu <herbert1984106@...il.com>
To:	Mehul Chadha <mehulc87@...il.com>
Cc:	kvm <kvm@...r.kernel.org>, linux-kernel@...r.kernel.org
Subject: Re: how to map a host virtual address (hva) to guest address space (gva/gpa/gfn)

Thanks Mehul.

On Tue, Jun 19, 2012 at 7:33 PM, Mehul Chadha <mehulc87@...il.com> wrote:
> On Tue, Jun 19, 2012 at 6:09 PM, sheng qiu <herbert1984106@...il.com> 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@...il.com
College Station, TX 77843-3259
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