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Re: [Xen-devel] [PATCH] x86/AMD: make use of CPUID leaf 0xb when available
- To: Jan Beulich <JBeulich@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 7 Jun 2019 13:53:31 +0100
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- Cc: Pu Wen <puwen@xxxxxxxx>, Brian Woods <brian.woods@xxxxxxx>, Wei Liu <wl@xxxxxxx>, Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Delivery-date: Fri, 07 Jun 2019 12:53:37 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 07/06/2019 13:50, Jan Beulich wrote:
> Initially I did simply stumble across a backport of Linux commit
> e0ceeae708 ("x86/CPU/hygon: Fix phys_proc_id calculation logic for
> multi-die processors") to our kernels. There I got puzzled by the claim
> that a similar change isn't needed on the AMD side. As per the web page
> cited [1], there aren't supposed to be affected AMD processors, but
> according to my reading there are: The EPYC 7000 series comes with 8,
> 16, 24, or 32 cores, which I imply to be 1, 2, 3, or 4 die processors.
> And many of them have "1P/2P" in the "socket count" column. Therefore
> our calculation, being based on CPUID.80000008.EBX[15:12], would be
> similarly wrong on such 2-socket 1- or 2-die systems.
>
> Checking Linux code I then found that they don't even rely on the
> calculation we currently use anymore, at least not in the case when
> leaf 0xb is available (which is the case on Fam17). Let's follow
> Suravee's Linux commit 3986a0a805 ("x86/CPU/AMD: Derive CPU topology
> from CPUID function 0xB when available") in this regard to address this.
>
> To avoid logging duplicate information, make the function return bool.
> Move its and detect_ht()'s declaration to a private header at the same
> time.
>
> [1] https://www.amd.com/en/products/specifications/processors
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Hygon Fam18h is basically identical to AMD Fam17h at the moment, so an
equivalent change in hygon.c should also be made.
~Andrew
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