The following commit has been merged into the smp/core branch of tip:
Commit-ID: 666e1156b2c514f045827f50263ed2eb9d78671b
Gitweb: https://git.kernel.org/tip/666e1156b2c514f045827f50263ed2eb9d78671b
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Fri, 12 May 2023 23:07:03 +02:00
Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Mon, 15 May 2023 13:44:48 +02:00
x86/smpboot: Rename start_cpu0() to soft_restart_cpu()
This is used in the SEV play_dead() implementation to re-online CPUs. But
that has nothing to do with CPU0.
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Tested-by: Michael Kelley <mikelley@xxxxxxxxxxxxx>
Tested-by: Oleksandr Natalenko <oleksandr@xxxxxxxxxxxxxx>
Tested-by: Helge Deller <deller@xxxxxx> # parisc
Tested-by: Guilherme G. Piccoli <gpiccoli@xxxxxxxxxx> # Steam Deck
Link: https://lore.kernel.org/r/20230512205255.662319599@xxxxxxxxxxxxx
---
arch/x86/include/asm/cpu.h | 2 +-
arch/x86/kernel/callthunks.c | 2 +-
arch/x86/kernel/head_32.S | 10 +++++-----
arch/x86/kernel/head_64.S | 10 +++++-----
arch/x86/kernel/sev.c | 2 +-
5 files changed, 13 insertions(+), 13 deletions(-)
diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h
index 78796b9..b356464 100644
--- a/arch/x86/include/asm/cpu.h
+++ b/arch/x86/include/asm/cpu.h
@@ -30,7 +30,7 @@ struct x86_cpu {
#ifdef CONFIG_HOTPLUG_CPU
extern int arch_register_cpu(int num);
extern void arch_unregister_cpu(int);
-extern void start_cpu0(void);
+extern void soft_restart_cpu(void);
#ifdef CONFIG_DEBUG_HOTPLUG_CPU0
extern int _debug_hotplug_cpu(int cpu, int action);
#endif
diff --git a/arch/x86/kernel/callthunks.c b/arch/x86/kernel/callthunks.c
index 22ab139..f5a6236 100644
--- a/arch/x86/kernel/callthunks.c
+++ b/arch/x86/kernel/callthunks.c
@@ -134,7 +134,7 @@ static bool skip_addr(void *dest)
if (dest == ret_from_fork)
return true;
#ifdef CONFIG_HOTPLUG_CPU
- if (dest == start_cpu0)
+ if (dest == soft_restart_cpu)
return true;
#endif
#ifdef CONFIG_FUNCTION_TRACER
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index 67c8ed9..805abf1 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -140,16 +140,16 @@ SYM_CODE_END(startup_32)
#ifdef CONFIG_HOTPLUG_CPU
/*
- * Boot CPU0 entry point. It's called from play_dead(). Everything has been set
- * up already except stack. We just set up stack here. Then call
- * start_secondary().
+ * Entry point for soft restart of a CPU. Invoked from xxx_play_dead() for
+ * restarting the boot CPU or for restarting SEV guest CPUs after CPU hot
+ * unplug. Everything is set up already except the stack.
*/
-SYM_FUNC_START(start_cpu0)
+SYM_FUNC_START(soft_restart_cpu)
movl initial_stack, %ecx
movl %ecx, %esp
call *(initial_code)
1: jmp 1b
-SYM_FUNC_END(start_cpu0)
+SYM_FUNC_END(soft_restart_cpu)
#endif
/*
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index a5df3e9..fc86bc1 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -377,11 +377,11 @@ SYM_CODE_END(secondary_startup_64)
#ifdef CONFIG_HOTPLUG_CPU
/*
- * Boot CPU0 entry point. It's called from play_dead(). Everything has been set
- * up already except stack. We just set up stack here. Then call
- * start_secondary() via .Ljump_to_C_code.
+ * Entry point for soft restart of a CPU. Invoked from xxx_play_dead() for
+ * restarting the boot CPU or for restarting SEV guest CPUs after CPU hot
+ * unplug. Everything is set up already except the stack.
*/
-SYM_CODE_START(start_cpu0)
+SYM_CODE_START(soft_restart_cpu)
ANNOTATE_NOENDBR
UNWIND_HINT_END_OF_STACK
@@ -390,7 +390,7 @@ SYM_CODE_START(start_cpu0)
movq TASK_threadsp(%rcx), %rsp
jmp .Ljump_to_C_code
-SYM_CODE_END(start_cpu0)
+SYM_CODE_END(soft_restart_cpu)
#endif
#ifdef CONFIG_AMD_MEM_ENCRYPT
diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c
index b031244..d095a5d 100644
--- a/arch/x86/kernel/sev.c
+++ b/arch/x86/kernel/sev.c
@@ -1328,7 +1328,7 @@ static void sev_es_play_dead(void)
* If we get here, the VCPU was woken up again. Jump to CPU
* startup code to get it back online.
*/
- start_cpu0();
+ soft_restart_cpu();
}
#else /* CONFIG_HOTPLUG_CPU */
#define sev_es_play_dead native_play_dead
|