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Re: [Xen-devel] Ryzen 3xxx works with Windows

To: George Dunlap <george.dunlap@xxxxxxxxxx>
From: Jan Beulich <jbeulich@xxxxxxxx>
Date: Mon, 18 Nov 2019 11:34:39 +0100
Cc: AndrewCooper <andrew.cooper3@xxxxxxxxxx>, Steven Haigh <netwiz@xxxxxxxxx>, Andreas Kinzler <hfp@xxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
Delivery-date: Mon, 18 Nov 2019 10:34:50 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 15.11.2019 18:13, George Dunlap wrote:
> On 11/15/19 5:06 PM, Andreas Kinzler wrote:
>> Hello All,
>>
>> I compared the CPUID listings from Ryzen 2700X (attached as tar.xz) to
>> 3700X and found only very few differences. I added
>>
>> cpuid = [ "0x80000008:ecx=xxxxxxxxxxxxxxxx0100xxxxxxxxxxxx" ]
>>
>> to xl.cfg and then Windows runs great with 16 vCPUs. Cinebench R15 score
>> is >2050 which is more or less the bare metal value.
> 
> Awesome.  Any idea what those bits do?

That's the apic_id_size field (using the naming of
xen/include/xen/lib/x86/cpuid.h).

Jan

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References:
- [Xen-devel] Ryzen 3xxx works with Windows
  - From: Andreas Kinzler
- Re: [Xen-devel] Ryzen 3xxx works with Windows
  - From: George Dunlap

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