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Re: [Xen-devel] [PATCH v10 02/10] xen: Add support for VMware cpuid leaves

On 05/20/15 04:03, Julien Grall wrote:
> Hi,
> On 19/05/2015 21:02, Andrew Cooper wrote:
>>> diff --git a/xen/include/public/arch-x86/xen.h 
>>> b/xen/include/public/arch-x86/xen.h
>>> index cea3fe7..5a5bad6 100644
>>> --- a/xen/include/public/arch-x86/xen.h
>>> +++ b/xen/include/public/arch-x86/xen.h
>>> @@ -263,7 +263,7 @@ struct arch_shared_info {
>>>   typedef struct arch_shared_info arch_shared_info_t;
>>>   struct xen_arch_domainconfig {
>>> -    char dummy;
>>> +    uint64_t vmware_hwver;
>> Julien: (as the author of the introducing patch) Given that this
>> structure is used as part of a domain_create hypercall only, I think a
>> comment is warrented stating that its API/ABI is covered by the
> It's part of DOMCTL_INTERFACE_VERSION. Feel free to send a patch to add 
> a comment.
>> Strictly speaking, this is currently part of the public ABI which must
>> always maintain backwards compatibility.
> I don't think it's necessary to maintain backwards compatibility.  This 
> has been added during this is release cycle.
>> Don:  Feel free to retain my Reviewed-by, subject to the adjustments listed.
> It's rather strange to have a separate patch for adding vmware_hwver 
> version in the tools.

That was done to reduce the size of the patches.

> You are relying on the fact that the toolstack 
> memset zero xen_arch_domainconfig to zero which is hidden in the maze of 
> the code (the memset is done on an upper container).
> It would be worth to add an explicit vmware_hwver = 0 in the 
> libxl__arch_domain_prepare_config.

Ok, I will do so (the next patch does change this code).  This does add
a requirement of a tools ack to this patch.

   -Don Slutz

> Regards,

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