Re: [Xen-devel] [PATCH V15 5/9] xen: Make gpfn related memops compatible with wider return values

[Tamas K Lengyel <tklengyel@xxxxxxxxxxxxx>]

On Mon, Apr 20, 2015 at 5:22 PM, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:

On 20/04/15 16:06, Tamas K Lengyel wrote:
> The current implementation of three memops, XENMEM_current_reservation,
> XENMEM_maximum_reservation and XENMEM_maximum_gpfn return values as an
> int. However, in ARM64 we could potentially have 36-bit pfn's, thus
> in preparation for the ARM patch, in this patch we update the existing
> memop routines to use a struct, xen_get_gpfn, to exchange the gpfn info
> as a uin64_t.
>
> This patch also adds error checking on the toolside in case the memop
> fails.
>
> Signed-off-by: Tamas K Lengyel <tklengyel@xxxxxxxxxxxxx>

XENMEM, unlikely domctls/sysctls is a guest-visible stable ABI/API.

You cannot make adjustments like this, but you can add a brand new op
with appropriate parameters and list the old ops as deprecated.

~Andrew

Ack, thanks.

Tamas

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