From: David Woodhouse <dwmw2@infradead.org>
To: Borislav Petkov <bp@alien8.de>, Usama Arif <usama.arif@bytedance.com>
Cc: tglx@linutronix.de, kim.phillips@amd.com, brgerst@gmail.com,
piotrgorski@cachyos.org, oleksandr@natalenko.name,
arjan@linux.intel.com, mingo@redhat.com,
dave.hansen@linux.intel.com, hpa@zytor.com, x86@kernel.org,
pbonzini@redhat.com, paulmck@kernel.org,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
rcu@vger.kernel.org, mimoja@mimoja.de, hewenliang4@huawei.com,
thomas.lendacky@amd.com, seanjc@google.com,
pmenzel@molgen.mpg.de, fam.zheng@bytedance.com,
punit.agrawal@bytedance.com, simon.evans@bytedance.com,
liangma@liangbit.com, gpiccoli@igalia.com,
David Woodhouse <dwmw@amazon.co.uk>
Subject: Re: [PATCH v15 04/12] x86/smpboot: Reference count on smpboot_setup_warm_reset_vector()
Date: Tue, 21 Mar 2023 11:43:58 +0000 [thread overview]
Message-ID: <8D6C2EC1-7B53-410B-84C3-A1991A71DEB7@infradead.org> (raw)
In-Reply-To: <20230321114115.GGZBmX270DI11eXvM+@fat_crate.local>
On 21 March 2023 11:41:15 GMT, Borislav Petkov <bp@alien8.de> wrote:
>On Thu, Mar 16, 2023 at 10:21:01PM +0000, Usama Arif wrote:
>> From: David Woodhouse <dwmw@amazon.co.uk>
>>
>> When bringing up a secondary CPU from do_boot_cpu(), the warm reset flag
>> is set in CMOS and the starting IP for the trampoline written inside the
>> BDA at 0x467. Once the CPU is running, the CMOS flag is unset and the
>> value in the BDA cleared.
>>
>> To allow for parallel bringup of CPUs, add a reference count to track the
>> number of CPUs currently bring brought up, and clear the state only when
>
>s/bring //
"being", I think.
next prev parent reply other threads:[~2023-03-21 11:44 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-16 22:20 [PATCH v15 00/12] Parallel CPU bringup for x86_64 Usama Arif
2023-03-16 22:20 ` [PATCH v15 01/12] x86/apic/x2apic: Allow CPU cluster_mask to be populated in parallel Usama Arif
2023-03-16 22:20 ` [PATCH v15 02/12] cpu/hotplug: Move idle_thread_get() to <linux/smpboot.h> Usama Arif
2023-03-19 16:34 ` Borislav Petkov
2023-03-20 8:17 ` David Woodhouse
2023-03-21 19:20 ` David Woodhouse
2023-03-16 22:21 ` [PATCH v15 03/12] cpu/hotplug: Add dynamic parallel bringup states before CPUHP_BRINGUP_CPU Usama Arif
2023-03-20 14:30 ` Thomas Gleixner
2023-03-21 19:14 ` David Woodhouse
2023-03-16 22:21 ` [PATCH v15 04/12] x86/smpboot: Reference count on smpboot_setup_warm_reset_vector() Usama Arif
2023-03-21 11:41 ` Borislav Petkov
2023-03-21 11:43 ` David Woodhouse [this message]
2023-03-16 22:21 ` [PATCH v15 05/12] x86/smpboot: Split up native_cpu_up into separate phases and document them Usama Arif
2023-03-16 22:21 ` [PATCH v15 06/12] x86/smpboot: Remove initial_stack on 64-bit Usama Arif
2023-03-16 22:21 ` [PATCH v15 07/12] x86/smpboot: Remove early_gdt_descr " Usama Arif
2023-03-16 22:21 ` [PATCH v15 08/12] x86/smpboot: Remove initial_gs Usama Arif
2023-03-16 22:21 ` [PATCH v15 09/12] x86/smpboot: Support parallel startup of secondary CPUs Usama Arif
2023-03-21 18:28 ` Brian Gerst
2023-03-21 19:12 ` David Woodhouse
2023-03-21 21:02 ` Brian Gerst
2023-03-16 22:21 ` [PATCH v15 10/12] x86/smpboot: Send INIT/SIPI/SIPI to secondary CPUs in parallel Usama Arif
2023-03-16 22:21 ` [PATCH v15 11/12] x86/smpboot: Serialize topology updates for secondary bringup Usama Arif
2023-03-16 22:21 ` [PATCH v15 12/12] x86/smpboot: Allow parallel bringup for SEV-ES Usama Arif
2023-03-17 16:04 ` Tom Lendacky
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