linux-kernel - Re: [PATCH v3 2/3] xen/privcmd: Add IOCTL_PRIVCMD_DM

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Message-ID: <602b6377-162f-5286-16f0-4f2865a00ef7@oracle.com>
Date:   Wed, 15 Feb 2017 09:47:44 -0500
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Paul Durrant <paul.durrant@...rix.com>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Cc:     Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>
Subject: Re: [PATCH v3 2/3] xen/privcmd: Add IOCTL_PRIVCMD_DM_OP

On 02/13/2017 12:03 PM, Paul Durrant wrote:
> Recently a new dm_op[1] hypercall was added to Xen to provide a mechanism
> for restricting device emulators (such as QEMU) to a limited set of
> hypervisor operations, and being able to audit those operations in the
> kernel of the domain in which they run.
>
> This patch adds IOCTL_PRIVCMD_DM_OP as gateway for __HYPERVISOR_dm_op.
>
> NOTE: There is no requirement for user-space code to bounce data through
>       locked memory buffers (as with IOCTL_PRIVCMD_HYPERCALL) since
>       privcmd has enough information to lock the original buffers
>       directly.
>
> [1] http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=524a98c2
>
> Signed-off-by: Paul Durrant <paul.durrant@...rix.com>

Applied to for-linus-4.11 (with agreed upon adjustments)

-boris