[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Xen-devel] [PATCH 2/3] xen/privcmd: Add IOCTL_PRIVCMD_DM_OP
On 02/09/2017 09:27 AM, Paul Durrant wrote:
-----Original Message----- From: Paul Durrant [mailto:paul.durrant@xxxxxxxxxx] Sent: 09 February 2017 14:18 To: xen-devel@xxxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx Cc: Paul Durrant <Paul.Durrant@xxxxxxxxxx>; Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>; Juergen Gross <jgross@xxxxxxxx> Subject: [PATCH 2/3] xen/privcmd: Add IOCTL_PRIVCMD_DM_OP Recently a new dm_op 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, bouncing the callers buffers through kernel memory to allow the address ranges to be audited (and negating the need to bounce through locked memory in user-space).Actually, it strikes me (now that I've posted the patch) that I should probably just mlock the user buffers rather than bouncing them through kernel... Anyway, I'd still appreciate review on other aspects of the patch.
Are you suggesting that the caller (user) mlocks the buffers? -boris _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
Lists.xenproject.org is hosted with RackSpace, monitoring our