Messages in this thread | | | Date | Wed, 2 Aug 2023 13:56:38 +0200 | Subject | Re: [patch V3 00/40] x86/cpu: Rework the topology evaluation | From | Juergen Gross <> |
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On 02.08.23 12:20, Thomas Gleixner wrote: > Hi! > > This is the follow up to V2: > > https://lore.kernel.org/lkml/20230728105650.565799744@linutronix.de > > which addresses the review feedback and some fallout reported on and > off-list. > > TLDR: > > This reworks the way how topology information is evaluated via CPUID > in preparation for a larger topology management overhaul to address > shortcomings of the current code vs. hybrid systems and systems which make > use of the extended topology domains in leaf 0x1f. Aside of that it's an > overdue spring cleaning to get rid of accumulated layers of duct tape and > haywire. > > What changed vs. V2: > > - Decoded and fixed the fallout vs. XEN/PV reported by Juergen. Thanks to > Juergen for the remote hand debugging sessions! > > That's addressed in the first two new patches in this series. Summary: > XEN/PV booted by pure chance since the addition of SMT control 5 years > ago. > > - Fixed the off by one in the AMD parser which was debugged by Michael > > - Addressed review comments from various people > > As discussed in: > > https://lore.kernel.org/lkml/BYAPR21MB16889FD224344B1B28BE22A1D705A@BYAPR21MB1688.namprd21.prod.outlook.com > .... > https://lore.kernel.org/lkml/87r0omjt8c.ffs@tglx > > this series unfortunately brings the Hyper-V BIOS inconsistency into > effect, which results in a slight performance impact. The L3 association > which "worked" so far by exploiting the inconsistency of the Linux topology > code is not longer supportable as we really need to get the actual short > comings of our topology management addressed in a consistent way. > > The series is based on V3 of the APIC cleanup series: > > https://lore.kernel.org/lkml/20230801103042.936020332@linutronix.de > > and also available on top of that from git: > > git://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git topo-cpuid-v3 > > Thanks, > > tglx
For Xen PV (dom0 and unprivileged guest):
Tested-by: Juergen Gross <jgross@suse.com>
Juergen
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