Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 66E12C64ED6 for ; Tue, 21 Feb 2023 23:19:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230367AbjBUXTV (ORCPT ); Tue, 21 Feb 2023 18:19:21 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38650 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229567AbjBUXTU (ORCPT ); Tue, 21 Feb 2023 18:19:20 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5515C1D92A; Tue, 21 Feb 2023 15:19:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=jXS1lkQkZmvbjWHdrm1FdRIWIWKga2358QZjX0MZOsA=; b=oC/iqxMFVpMFLrUKoSwRvv6J5S Z3nkIwV+pjc5ZB9kuyi4cegapYHzBoHlA8IjPsxmv9J+1wP/fa5GWvkGrb3nxlV/aJdJTyBNAtHB1 VFq2fGW1zdQk7vH+7mz+Mbc17VDvR5a8rkCij4KdL2tJCOzZZel8i4P6Epp/nyzpIvMVqIdemkGxA 0vqy8wSWOOFdhyh+GQrOjvnxrsGLdY2xrRKdl1Ie4aGYJmYJ7shTFthA6zsWUTfRQWDUb80COX71Y B6pWebq/fUYAwisoOacu8WQoDMMo4kpXEzYbN4sysL1WPj8k02l+vZJF04wIIrZhJFsp5SrplDVjS NoeU1kxw==; Received: from [2001:8b0:10b:5::bb3] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pUbuE-00Czml-6h; Tue, 21 Feb 2023 23:18:42 +0000 Message-ID: Subject: Re: [PATCH v9 0/8] Parallel CPU bringup for x86_64 From: David Woodhouse To: Thomas Gleixner , Oleksandr Natalenko Cc: Kim Phillips , Usama Arif , arjan@linux.intel.com, mingo@redhat.com, bp@alien8.de, 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, "Limonciello, Mario" , Piotr Gorski Date: Tue, 21 Feb 2023 23:18:40 +0000 In-Reply-To: <87356yofw3.ffs@tglx> References: <20230215145425.420125-1-usama.arif@bytedance.com> <2668869.mvXUDI8C0e@natalenko.name> <2a67f6cf18dd2c1879fad9fd8a28242918d3e5d2.camel@infradead.org> <982e1d6140705414e8fd60b990bd259a@natalenko.name> <715CBABF-4017-4784-8F30-5386F1524830@infradead.org> <67dbc69f-b712-8971-f1c9-5d07f506a19c@amd.com> <42dc683e2846ae8fc1e09715aaf7884660e1a386.camel@infradead.org> <37c18c3aeea2e558633b6da6886111d0@natalenko.name> <5A3B7074-0C6D-472B-803B-D76541828C1F@infradead.org> <3d8ed6e157df10c5175c636de0e21849@natalenko.name> <5c557f9b6f55dc2a612ee89142971298e6ae12d8.camel@infradead.org> <5b8f9c89f7015fa80c966c6c7f6fa259db6744f8.camel@infradead.org> <85ceb3f92abf3c013924de2f025517372bed19c0.camel@infradead.org> <3e5944de08ef0d23584d19bad7bae66c@natalenko.name> <26E5DC9C-0F19-4E4F-9076-04506A197374@infradead.org> <10CA27BB-ADC6-4421-86D2-A83BD7FA12E0@infradead.org> <9153284c37a79d303aa79dbf07c10329@natalenko.name> <87356yofw3.ffs@tglx> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-o274mTLIPhXV2Hx9LY6J" User-Agent: Evolution 3.44.4-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-o274mTLIPhXV2Hx9LY6J Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2023-02-21 at 22:41 +0100, Thomas Gleixner wrote: >=20 > @@ -57,6 +58,7 @@ asmlinkage acpi_status __visible x86_acp > =C2=A0 */ > =C2=A0int x86_acpi_suspend_lowlevel(void) > =C2=A0{ > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0unsigned int __maybe_unused sa= ved_smpboot_ctrl; > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0struct wakeup_header *hea= der =3D > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0(struct wakeup_header *) __va(real_mode_header->wak= eup_header); > =C2=A0 > @@ -115,7 +117,8 @@ int x86_acpi_suspend_lowlevel(void) > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0early_gdt_descr.address = =3D > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0(un= signed long)get_cpu_gdt_rw(smp_processor_id()); > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0initial_gs =3D per_cpu_of= fset(smp_processor_id()); > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0smpboot_control =3D 0; > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0/* Force the startup into boot= mode */ > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0saved_smpboot_ctrl =3D xchg(&s= mpboot_control, 0); > =C2=A0#endif > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0initial_code =3D (unsigne= d long)wakeup_long64; > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 saved_magic =3D 0x123456789abc= def0L; > @@ -128,6 +131,9 @@ int x86_acpi_suspend_lowlevel(void) > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0pause_graph_tracing(); > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0do_suspend_lowlevel(); > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0unpause_graph_tracing(); > + > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (IS_ENABLED(CONFIG_64BIT) &= & IS_ENABLED(CONFIG_SMP)) > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0smpboot_control =3D saved_smpboot_ctrl; > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0return 0; > =C2=A0} > =C2=A0 But wait, why is this giving it a dedicated temp_stack anyway? Why can't it use that CPU's idle thread stack like we usually do? I already made idle_thread_get() accessible from here. So we could do this... @@ -111,14 +112,16 @@ int x86_acpi_suspend_lowlevel(void) saved_magic =3D 0x12345678; #else /* CONFIG_64BIT */ #ifdef CONFIG_SMP - initial_stack =3D (unsigned long)temp_stack + sizeof(temp_stack); - early_gdt_descr.address =3D - (unsigned long)get_cpu_gdt_rw(smp_processor_id()); - initial_gs =3D per_cpu_offset(smp_processor_id()); - smpboot_control =3D 0; + if (!(smpboot_control & STARTUP_PARALLEL_MASK)) { + unsigned int cpu =3D smp_processor_id(); + initial_stack =3D (unsigned long)idle_thread_get(cpu)->thre= ad.sp; + early_gdt_descr.address =3D (unsigned long)get_cpu_gdt_rw(c= pu); + initial_gs =3D per_cpu_offset(cpu); + smpboot_control =3D 0; + } #endif initial_code =3D (unsigned long)wakeup_long64; But that's a whole bunch of pointless, because it can be even further simplified to just let the find its own crap like the secondaries do, except in the 'OMG CPUID won't tell me' case where it has to be told: So how about we just do something more like this. I'd *quite* like to put the actual handling of smpboot_control into a function we call in smpboot.c. and that whole x86_acpi_suspend_lowlevel() function wants all its horrid 64bit/smp ifdefs fixed up (and is there any reason there's a generic part saving CR0 and IA32_MISC_ENABLE right in the middle of some !CONFIG_64BIT parts? I don't see ordering constraints there). But this should work, I think: diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h index 33c0d5fd8af6..72b9375fec7c 100644 --- a/arch/x86/include/asm/smp.h +++ b/arch/x86/include/asm/smp.h @@ -208,4 +208,6 @@ extern unsigned int smpboot_control; #define STARTUP_APICID_CPUID_0B 0x40000000 #define STARTUP_APICID_CPUID_01 0x20000000 =20 +#define STARTUP_PARALLEL_MASK 0x60000000 + #endif /* _ASM_X86_SMP_H */ diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c index 06adf340a0f1..a1343a900caf 100644 --- a/arch/x86/kernel/acpi/sleep.c +++ b/arch/x86/kernel/acpi/sleep.c @@ -16,17 +16,14 @@ #include #include #include - +#include +#include #include #include "../../realmode/rm/wakeup.h" #include "sleep.h" =20 unsigned long acpi_realmode_flags; =20 -#if defined(CONFIG_SMP) && defined(CONFIG_64BIT) -static char temp_stack[4096]; -#endif - /** * acpi_get_wakeup_address - provide physical address for S3 wakeup * @@ -111,14 +108,11 @@ int x86_acpi_suspend_lowlevel(void) saved_magic =3D 0x12345678; #else /* CONFIG_64BIT */ #ifdef CONFIG_SMP - initial_stack =3D (unsigned long)temp_stack + sizeof(temp_stack); - early_gdt_descr.address =3D - (unsigned long)get_cpu_gdt_rw(smp_processor_id()); - initial_gs =3D per_cpu_offset(smp_processor_id()); - smpboot_control =3D 0; + if (!(smpboot_control & STARTUP_PARALLEL_MASK)) + smpboot_control =3D STARTUP_SECONDARY | cpu_physical_id(smp_processor_id= ()); #endif initial_code =3D (unsigned long)wakeup_long64; - saved_magic =3D 0x123456789abcdef0L; + saved_magic =3D 0x123456789abcdef0L; #endif /* CONFIG_64BIT */ =20 /* --=-o274mTLIPhXV2Hx9LY6J Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG 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