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Re: [Xen-devel] [PATCH 3/5] x86/cpu: Renumber X86_VENDOR_* to form a bitmap
- To: Jan Beulich <JBeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 5 Apr 2019 10:28:18 +0100
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- Cc: Pu Wen <puwen@xxxxxxxx>, Davidwang <Davidwang@xxxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Delivery-date: Fri, 05 Apr 2019 09:28:25 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 05/04/2019 10:03, Jan Beulich wrote:
>>>> On 04.04.19 at 22:26, <andrew.cooper3@xxxxxxxxxx> wrote:
>> --- a/xen/include/asm-x86/x86-vendors.h
>> +++ b/xen/include/asm-x86/x86-vendors.h
>> @@ -4,28 +4,29 @@
>> /*
>> * CPU vendor IDs
>> *
>> - * - X86_VENDOR_* are Xen-internal identifiers. Values and order are
>> - * arbitrary.
>> + * - X86_VENDOR_* are Xen-internal identifiers. The order is arbitrary, but
>> + * values form a bitmap so vendor checks can be made against multiple
>> + * vendors at once.
>> * - X86_VENDOR_*_E?X are architectural information from CPUID leaf 0
>> */
>> #define X86_VENDOR_UNKNOWN 0
>>
>> -#define X86_VENDOR_INTEL 1
>> +#define X86_VENDOR_INTEL (1 << 1)
> Any reason you start from a shift count of 1, instead of 0, when
> "unknown" simply is no bit set? We're not about to run out of bits,
> but preferably with this corrected
> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
No - that wasn't intentional. Will fix.
~Andrew
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