Re: [Xen-devel] [PATCH] xen: use vMSI related #define-s from public interface

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 21.09.17 at 03:12, <sstabellini@xxxxxxxxxx> wrote:
> On Fri, 1 Sep 2017, Jan Beulich wrote:
>> --- a/hw/xen/xen_pt_msi.c
>> +++ b/hw/xen/xen_pt_msi.c
>> @@ -18,6 +18,11 @@
>>  
>>  #define XEN_PT_AUTO_ASSIGN -1
>>  
>> +#ifndef XEN_DOMCTL_VMSI_X86_DEST_ID_MASK
>> +#if XEN_DOMCTL_INTERFACE_VERSION >= 0x0000000e
>> +#error vMSI defines missing from domctl.h
>> +#endif
> 
> All the version compatibility stuff goes to
> include/hw/xen/xen_common.h. Please move it there.

I know there's a central place, but moving there stuff that's
needed only in this file seemed rather counterproductive to
me - why would you want all files including that shared one
have to see these definitions? If there was a remote chance
that some other file may need to make use of it, I might
agree, but I don't see any such chance at all.

> We usually assume that the Xen version we are building against is
> "sane", so we don't do #error's typically.

Hmm, I can drop the #error, but to be honest I'm hesitant to do
so - I've put it there intentionally.

Jan


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