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Message-ID: <16d9f738-18fd-a929-e711-f2a1e757e33f@mailbox.org>
Date: Fri, 10 Mar 2023 19:20:56 +0000
From: Tor Vic <torvic9@...lbox.org>
To: Usama Arif <usama.arif@...edance.com>, dwmw2@...radead.org,
tglx@...utronix.de, kim.phillips@....com, brgerst@...il.com
Cc: piotrgorski@...hyos.org, oleksandr@...alenko.name,
arjan@...ux.intel.com, mingo@...hat.com, bp@...en8.de,
dave.hansen@...ux.intel.com, hpa@...or.com, x86@...nel.org,
pbonzini@...hat.com, paulmck@...nel.org,
linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
rcu@...r.kernel.org, mimoja@...oja.de, hewenliang4@...wei.com,
thomas.lendacky@....com, seanjc@...gle.com, pmenzel@...gen.mpg.de,
fam.zheng@...edance.com, punit.agrawal@...edance.com,
simon.evans@...edance.com, liangma@...ngbit.com
Subject: Re: [PATCH v14 00/12] Parallel CPU bringup for x86_64
On 08.03.23 17:13, Usama Arif wrote:
> The main code change over v13 is to enable parallel bringup for SEV-ES guests.
>
> Thanks,
> Usama
>
> Changes across versions:
> v2: Cut it back to just INIT/SIPI/SIPI in parallel for now, nothing more
> v3: Clean up x2apic patch, add MTRR optimisation, lock topology update
> in preparation for more parallelisation.
> v4: Fixes to the real mode parallelisation patch spotted by SeanC, to
> avoid scribbling on initial_gs in common_cpu_up(), and to allow all
> 24 bits of the physical X2APIC ID to be used. That patch still needs
> a Signed-off-by from its original author, who once claimed not to
> remember writing it at all. But now we've fixed it, hopefully he'll
> admit it now :)
> v5: rebase to v6.1 and remeasure performance, disable parallel bringup
> for AMD CPUs.
> v6: rebase to v6.2-rc6, disabled parallel boot on amd as a cpu bug and
> reused timer calibration for secondary CPUs.
> v7: [David Woodhouse] iterate over all possible CPUs to find any existing
> cluster mask in alloc_clustermask. (patch 1/9)
> Keep parallel AMD support enabled in AMD, using APIC ID in CPUID leaf
> 0x0B (for x2APIC mode) or CPUID leaf 0x01 where 8 bits are sufficient.
> Included sanity checks for APIC id from 0x0B. (patch 6/9)
> Removed patch for reusing timer calibration for secondary CPUs.
> commit message and code improvements.
> v8: Fix CPU0 hotplug by setting up the initial_gs, initial_stack and
> early_gdt_descr.
> Drop trampoline lock and bail if APIC ID not found in find_cpunr.
> Code comments improved and debug prints added.
> v9: Drop patch to avoid repeated saves of MTRR at boot time.
> rebased and retested at v6.2-rc8.
> added kernel doc for no_parallel_bringup and made do_parallel_bringup
> __ro_after_init.
> v10: Fixed suspend/resume not working with parallel smpboot.
> rebased and retested to 6.2.
> fixed checkpatch errors.
> v11: Added patches from Brian Gerst to remove the global variables initial_gs,
> initial_stack, and early_gdt_descr from the 64-bit boot code
> (https://lore.kernel.org/all/20230222221301.245890-1-brgerst@gmail.com/).
> v12: Fixed compilation errors, acquire tr_lock for every stack setup in
> trampoline_64.S.
> Rearranged commits for a cleaner git history.
> v13: Fix build error with CONFIG_FORCE_NR_CPUS.
> Commit message improved, typos fixed and extra comments added.
> v14: Enable parallel bringup for SEV-ES guests
>
> Brian Gerst (3):
> x86/smpboot: Remove initial_stack on 64-bit
> x86/smpboot: Remove early_gdt_descr on 64-bit
> x86/smpboot: Remove initial_gs
>
> David Woodhouse (9):
> x86/apic/x2apic: Allow CPU cluster_mask to be populated in parallel
> cpu/hotplug: Move idle_thread_get() to <linux/smpboot.h>
> cpu/hotplug: Add dynamic parallel bringup states before
> CPUHP_BRINGUP_CPU
> x86/smpboot: Reference count on smpboot_setup_warm_reset_vector()
> x86/smpboot: Split up native_cpu_up into separate phases and document
> them
> x86/smpboot: Support parallel startup of secondary CPUs
> x86/smpboot: Send INIT/SIPI/SIPI to secondary CPUs in parallel
> x86/smpboot: Serialize topology updates for secondary bringup
> x86/smpboot: Allow parallel bringup for SEV-ES
>
> .../admin-guide/kernel-parameters.txt | 3 +
> arch/x86/include/asm/cpu.h | 1 +
> arch/x86/include/asm/processor.h | 6 +-
> arch/x86/include/asm/realmode.h | 4 +-
> arch/x86/include/asm/sev-common.h | 3 +
> arch/x86/include/asm/sev.h | 5 +
> arch/x86/include/asm/smp.h | 18 +-
> arch/x86/include/asm/topology.h | 2 -
> arch/x86/kernel/acpi/sleep.c | 30 +-
> arch/x86/kernel/apic/apic.c | 2 +-
> arch/x86/kernel/apic/x2apic_cluster.c | 126 +++---
> arch/x86/kernel/asm-offsets.c | 1 +
> arch/x86/kernel/cpu/common.c | 6 +-
> arch/x86/kernel/cpu/topology.c | 2 +-
> arch/x86/kernel/head_64.S | 162 ++++++--
> arch/x86/kernel/smpboot.c | 366 +++++++++++++-----
> arch/x86/realmode/init.c | 3 +
> arch/x86/realmode/rm/trampoline_64.S | 27 +-
> arch/x86/xen/smp_pv.c | 4 +-
> arch/x86/xen/xen-head.S | 2 +-
> include/linux/cpuhotplug.h | 2 +
> include/linux/smpboot.h | 7 +
> kernel/cpu.c | 31 +-
> kernel/smpboot.h | 2 -
> 24 files changed, 614 insertions(+), 201 deletions(-)
>
On Linux 6.2, Zen2 and Skylake, no issues or boot problems:
Tested-by: Tor Vic <torvic9@...lbox.org>
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