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

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Message-ID: <CAB15OBd49MjiuMp9fi-noxmqkhMkGaRQ4N7WVhTwc79V2S9+Yg@mail.gmail.com>
Date:	Tue, 19 Jun 2012 19:33:19 -0500
From:	Mehul Chadha <mehulc87@...il.com>
To:	sheng qiu <herbert1984106@...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)

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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