Re: [Xen-devel] [PATCH v2 2/3] x86/ioreq server: Rename p2m_mmio_write_dm to p2m_ioreq_server

[George Dunlap <george.dunlap@xxxxxxxxxx>]

On Mon, Apr 18, 2016 at 9:41 AM, Paul Durrant <Paul.Durrant@xxxxxxxxxx> wrote:
>> -----Original Message-----
>> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
>> Sent: 08 April 2016 22:48
>> To: xen-devel@xxxxxxxxxxxxx
>> Cc: Andrew Cooper; Paul Durrant; George Dunlap; Jun Nakajima; Kevin Tian;
>> zhiyuan.lv@xxxxxxxxx; Yu Zhang; Keir (Xen.org); Tim (Xen.org)
>> Subject: Re: [PATCH v2 2/3] x86/ioreq server: Rename p2m_mmio_write_dm
>> to p2m_ioreq_server
>>
>> >>> On 31.03.16 at 12:53, <yu.c.zhang@xxxxxxxxxxxxxxx> wrote:
>> > --- a/xen/include/public/hvm/hvm_op.h
>> > +++ b/xen/include/public/hvm/hvm_op.h
>> > @@ -83,7 +83,7 @@ typedef enum {
>> >      HVMMEM_ram_rw,             /* Normal read/write guest RAM */
>> >      HVMMEM_ram_ro,             /* Read-only; writes are discarded */
>> >      HVMMEM_mmio_dm,            /* Reads and write go to the device model
>> */
>> > -    HVMMEM_mmio_write_dm       /* Read-only; writes go to the device
>> model */
>> > +    HVMMEM_ioreq_server,
>> >  } hvmmem_type_t;
>> >
>> >  /* Following tools-only interfaces may change in future. */
>>
>> So there's one problem here, which the comment at the bottom
>> of the context already hints at: This enum is part of the not
>> tools restricted interface (as HVMOP_get_mem_type is usable
>> by guests themselves), which we cannot change like this. Since
>> the meaning of the enumerator value doesn't change, I guess
>> we can get away with simply retaining its old name for non-up-
>> to-date __XEN_INTERFACE_VERSION__.
>>
>
> Has the type made it into a release yet. I was assuming we could make the 
> change without any need to play with the version since it's only ever been 
> present in  xen-unstable so far.

I think you need a Release Manager ack for that; but if it's the case
that the type has never been seen in public, then I think it should be
able to be renamed (in fact, we should rename it so that we don't have
to deal with backwards compatibility later).

 -George

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