From: David Woodhouse <dwmw2@infradead.org>
To: Oleksandr Natalenko <oleksandr@natalenko.name>
Cc: Kim Phillips <kim.phillips@amd.com>,
tglx@linutronix.de, Usama Arif <usama.arif@bytedance.com>,
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" <Mario.Limonciello@amd.com>,
Piotr Gorski <piotrgorski@cachyos.org>
Subject: Re: [PATCH v9 0/8] Parallel CPU bringup for x86_64
Date: Tue, 21 Feb 2023 08:17:54 +0000 [thread overview]
Message-ID: <5c557f9b6f55dc2a612ee89142971298e6ae12d8.camel@infradead.org> (raw)
In-Reply-To: <3d8ed6e157df10c5175c636de0e21849@natalenko.name>
[-- Attachment #1: Type: text/plain, Size: 1964 bytes --]
On Tue, 2023-02-21 at 09:05 +0100, Oleksandr Natalenko wrote:
>
> Please see here: http://ix.io/4oLm
Was that just for one CPU? Can we have them all please?
The interesting part is the line starting 00000001. We're looking at
the top 8 bits of EBX:
Leaf Subleaf EAX EBX ECX EDX
00000000 00000000: 00000010 .... 68747541 Auth 444d4163 cAMD 69746e65 enti
00000001 00000000: 00a20f12 .... 00200800 .. . 7ef8320b .2.~ 178bfbff ....
↑↑
So the first CPU is CPU0. Could have told you that... what about the others? :)
If anyone can reproduce this with a serial port, can you try this?
From 98ad11d0fb88f081f49f7b1496420dbfbeff8833 Mon Sep 17 00:00:00 2001
From: David Woodhouse <dwmw@amazon.co.uk>
Date: Sat, 4 Feb 2023 15:20:24 +0000
Subject: [PATCH] parallel debug
---
arch/x86/kernel/head_64.S | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 0e4e53d231db..da7f4d2d9951 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -281,6 +281,15 @@ SYM_INNER_LABEL(secondary_startup_64_no_verify, SYM_L_GLOBAL)
.Lsetup_AP:
/* EDX contains the APIC ID of the current CPU */
+#if 1
+ /* Test hack: Print APIC ID and then CPU# when we find it. */
+ mov %edx, %ecx
+ mov %edx, %eax
+ addb $'A', %al
+ mov $0x3f8, %dx
+ outb %al, %dx
+ mov %ecx, %edx
+#endif
xorq %rcx, %rcx
leaq cpuid_to_apicid(%rip), %rbx
@@ -302,6 +311,14 @@ SYM_INNER_LABEL(secondary_startup_64_no_verify, SYM_L_GLOBAL)
.Linit_cpu_data:
/* Get the per cpu offset for the given CPU# which is in ECX */
+#if 1
+ mov %rcx, %rax
+ shr $3, %rax
+ addb $'a', %al
+
+ mov $0x3f8, %dx
+ outb %al, %dx
+#endif
leaq __per_cpu_offset(%rip), %rbx
movq (%rbx,%rcx,8), %rbx
/* Save it for GS BASE setup */
--
2.39.0
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next prev parent reply other threads:[~2023-02-21 8:18 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-15 14:54 [PATCH v9 0/8] Parallel CPU bringup for x86_64 Usama Arif
2023-02-15 14:54 ` [PATCH v9 1/8] x86/apic/x2apic: Allow CPU cluster_mask to be populated in parallel Usama Arif
2023-02-16 20:58 ` Kim Phillips
2023-02-15 14:54 ` [PATCH v9 2/8] cpu/hotplug: Move idle_thread_get() to <linux/smpboot.h> Usama Arif
2023-02-15 14:54 ` [PATCH v9 3/8] cpu/hotplug: Add dynamic parallel bringup states before CPUHP_BRINGUP_CPU Usama Arif
2023-02-15 14:54 ` [PATCH v9 4/8] x86/smpboot: Reference count on smpboot_setup_warm_reset_vector() Usama Arif
2023-02-15 14:54 ` [PATCH v9 5/8] x86/smpboot: Split up native_cpu_up into separate phases and document them Usama Arif
2023-02-15 14:54 ` [PATCH v9 6/8] x86/smpboot: Support parallel startup of secondary CPUs Usama Arif
2023-02-15 14:54 ` [PATCH v9 7/8] x86/smpboot: Send INIT/SIPI/SIPI to secondary CPUs in parallel Usama Arif
2023-02-15 14:54 ` [PATCH v9 8/8] x86/smpboot: Serialize topology updates for secondary bringup Usama Arif
2023-02-16 6:34 ` [PATCH v9 0/8] Parallel CPU bringup for x86_64 Paul E. McKenney
2023-02-20 16:08 ` Oleksandr Natalenko
2023-02-20 16:20 ` David Woodhouse
2023-02-20 16:40 ` Oleksandr Natalenko
2023-02-20 20:31 ` David Woodhouse
2023-02-20 21:23 ` Oleksandr Natalenko
2023-02-20 21:34 ` Piotr Gorski
2023-02-20 21:39 ` David Woodhouse
2023-02-20 23:23 ` Kim Phillips
2023-02-20 23:30 ` David Woodhouse
2023-02-21 4:20 ` Kim Phillips
2023-02-21 7:16 ` David Woodhouse
2023-02-21 7:27 ` Oleksandr Natalenko
2023-02-21 7:53 ` David Woodhouse
2023-02-21 8:05 ` Oleksandr Natalenko
2023-02-21 8:17 ` David Woodhouse [this message]
2023-02-21 8:25 ` Oleksandr Natalenko
2023-02-21 8:35 ` David Woodhouse
2023-02-21 8:44 ` Oleksandr Natalenko
2023-02-21 9:06 ` David Woodhouse
2023-02-21 9:49 ` Oleksandr Natalenko
2023-02-21 10:27 ` David Woodhouse
2023-02-21 10:47 ` [External] " Usama Arif
2023-02-21 11:42 ` Oleksandr Natalenko
2023-02-21 11:54 ` Usama Arif
2023-02-21 13:22 ` David Woodhouse
2023-02-21 11:46 ` Oleksandr Natalenko
2023-02-21 11:49 ` David Woodhouse
2023-02-21 12:14 ` Oleksandr Natalenko
2023-02-21 19:10 ` David Woodhouse
2023-02-21 20:04 ` [External] " Usama Arif
2023-02-21 21:04 ` Oleksandr Natalenko
2023-02-21 21:41 ` Thomas Gleixner
2023-02-21 21:44 ` David Woodhouse
2023-02-21 23:18 ` David Woodhouse
2023-02-22 0:00 ` [External] " Usama Arif
2023-02-22 8:19 ` David Woodhouse
2023-02-22 9:46 ` Thomas Gleixner
2023-02-22 9:51 ` David Woodhouse
2023-02-22 9:31 ` Thomas Gleixner
2023-02-20 22:22 ` Piotr Gorski
2023-02-20 22:23 ` [External] " Usama Arif
2023-02-20 22:41 ` Oleksandr Natalenko
2023-02-22 10:11 ` David Woodhouse
2023-02-22 11:11 ` [External] " Usama Arif
2023-02-22 12:08 ` Brian Gerst
2023-02-22 12:53 ` David Woodhouse
2023-02-22 16:42 ` Thomas Gleixner
2023-02-23 11:07 ` David Woodhouse
2023-02-23 14:37 ` Thomas Gleixner
2023-02-23 15:12 ` David Woodhouse
2023-02-23 19:24 ` [External] " Usama Arif
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