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Re: [PATCH] xen/public: add comments regarding interface version bumps


  • To: Julien Grall <julien@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
  • From: Jürgen Groß <jgross@xxxxxxxx>
  • Date: Mon, 14 Oct 2024 13:01:53 +0200
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  • Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>
  • Delivery-date: Mon, 14 Oct 2024 11:02:06 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 14.10.24 12:48, Julien Grall wrote:
Hi Juergen,

On 14/10/2024 11:33, Juergen Gross wrote:
domctl.h and sysctl.h have an interface version, which needs to be
bumped in case of incompatible modifications of the interface.

What about vm_event.h?

Indeed.

There seem to be others missing, too. Here a git grep output of
possible candidates (including domctl.h, sysctl.h and vm_event.h):

arch-x86/xen-mca.h:#define XEN_MCA_INTERFACE_VERSION 0x01ecc003
domctl.h:#define XEN_DOMCTL_INTERFACE_VERSION 0x00000017
hvm/hvm_op.h:#define HVMOP_ALTP2M_INTERFACE_VERSION 0x00000001
platform.h:#define XENPF_INTERFACE_VERSION 0x03000001
sysctl.h:#define XEN_SYSCTL_INTERFACE_VERSION 0x00000015
vm_event.h:#define VM_EVENT_INTERFACE_VERSION 0x00000007
xsm/flask_op.h:#define XEN_FLASK_INTERFACE_VERSION 1

I can add another patch for the missing ones (or 1 patch for each?)



In order to avoid misunderstandings, add a comment to both headers
specifying in which cases a bump is needed.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>

Regardless my question above:

Acked-by: Julien Grall <jgrall@xxxxxxxxxx>

Thanks,

Juergen

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