Messages in this thread | | | Date | Tue, 7 Feb 2023 10:27:00 -0600 | Subject | Re: [PATCH v6 07/11] x86/smpboot: Disable parallel boot for AMD CPUs | From | Kim Phillips <> |
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On 2/6/23 11:58 AM, Kim Phillips wrote: > On 2/4/23 9:40 AM, David Woodhouse wrote: >> On Fri, 2023-02-03 at 13:48 -0600, Kim Phillips wrote: >>> If I: >>> >>> - take dwmw2's parallel-6.2-rc6 branch (commit 459d1c46dbd1) >>> - remove the set_cpu_bug(c, X86_BUG_NO_PARALLEL_BRINGUP) line from amd.c >>> >>> Then: >>> >>> - a Ryzen 3000 (Picasso A1/Zen+) notebook I have access to fails to boot. >>> - Zen 2,3,4-based servers boot fine >>> - a Zen1-based server doesn't boot. >> >> I've changed it to use CPUID 0xb only if we're actually in x2apic mode, >> which Boris tells me won't be the case on Zen1 because that doesn't >> support X2APIC. >> >> When we're not in x2apic mode, we can use CPUID 0x1 because the 8 bits >> of APIC ID we find there are perfectly sufficient. >> >> New tree in the same place as before, commit ce7e2d1e046a for the >> parallel-6.2-rc6-part1 tag and 17bbd12ee03 for parallel-6.2-rc6. > > Thanks, Zen 1 through 4 based servers all boot both those two tree > commits successfully. > > I'll try that Ryzen again later.
The Ryzen 3000 also successfully boots those two branches now.
Thanks,
Kim
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