From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org
Cc: "Rafael J. Wysocki" <rafael@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Adrian Hunter <adrian.hunter@intel.com>,
Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@linux.intel.com>,
Elena Reshetova <elena.reshetova@intel.com>,
Jun Nakajima <jun.nakajima@intel.com>,
Rick Edgecombe <rick.p.edgecombe@intel.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
"Kalra, Ashish" <ashish.kalra@amd.com>,
Sean Christopherson <seanjc@google.com>,
"Huang, Kai" <kai.huang@intel.com>, Baoquan He <bhe@redhat.com>,
kexec@lists.infradead.org, linux-coco@lists.linux.dev,
linux-kernel@vger.kernel.org,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [PATCHv8 14/17] x86/smp: Add smp_ops.stop_this_cpu() callback
Date: Tue, 27 Feb 2024 23:24:49 +0200 [thread overview]
Message-ID: <20240227212452.3228893-15-kirill.shutemov@linux.intel.com> (raw)
In-Reply-To: <20240227212452.3228893-1-kirill.shutemov@linux.intel.com>
If the helper is defined, it is called instead of halt() to stop the CPU
at the end of stop_this_cpu() and on crash CPU shutdown.
ACPI MADT will use it to hand over the CPU to BIOS in order to be able
to wake it up again after kexec.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Kai Huang <kai.huang@intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/include/asm/smp.h | 1 +
arch/x86/kernel/process.c | 7 +++++++
arch/x86/kernel/reboot.c | 6 ++++++
3 files changed, 14 insertions(+)
diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h
index 4fab2ed454f3..390d53fd34f9 100644
--- a/arch/x86/include/asm/smp.h
+++ b/arch/x86/include/asm/smp.h
@@ -38,6 +38,7 @@ struct smp_ops {
int (*cpu_disable)(void);
void (*cpu_die)(unsigned int cpu);
void (*play_dead)(void);
+ void (*stop_this_cpu)(void);
void (*send_call_func_ipi)(const struct cpumask *mask);
void (*send_call_func_single_ipi)(int cpu);
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index ab49ade31b0d..00c1b957476d 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -835,6 +835,13 @@ void __noreturn stop_this_cpu(void *dummy)
*/
cpumask_clear_cpu(cpu, &cpus_stop_mask);
+#ifdef CONFIG_SMP
+ if (smp_ops.stop_this_cpu) {
+ smp_ops.stop_this_cpu();
+ unreachable();
+ }
+#endif
+
for (;;) {
/*
* Use native_halt() so that memory contents don't change
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 0574d4ad6b41..0a75efe579c0 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -880,6 +880,12 @@ static int crash_nmi_callback(unsigned int val, struct pt_regs *regs)
cpu_emergency_disable_virtualization();
atomic_dec(&waiting_for_crash_ipi);
+
+ if (smp_ops.stop_this_cpu) {
+ smp_ops.stop_this_cpu();
+ unreachable();
+ }
+
/* Assume hlt works */
halt();
for (;;)
--
2.43.0
next prev parent reply other threads:[~2024-02-27 21:25 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-27 21:24 [PATCHv8 00/17, CORRECTED] x86/tdx: Add kexec support Kirill A. Shutemov
2024-02-27 21:24 ` [PATCHv8 01/17] x86/acpi: Extract ACPI MADT wakeup code into a separate file Kirill A. Shutemov
2024-02-27 21:24 ` [PATCHv8 02/17] x86/apic: Mark acpi_mp_wake_* variables as __ro_after_init Kirill A. Shutemov
2024-02-27 21:24 ` [PATCHv8 03/17] cpu/hotplug: Add support for declaring CPU offlining not supported Kirill A. Shutemov
2024-02-27 21:24 ` [PATCHv8 04/17] cpu/hotplug, x86/acpi: Disable CPU offlining for ACPI MADT wakeup Kirill A. Shutemov
2024-02-27 21:24 ` [PATCHv8 05/17] x86/kexec: Keep CR4.MCE set during kexec for TDX guest Kirill A. Shutemov
2024-02-27 21:24 ` [PATCHv8 06/17] x86/mm: Make x86_platform.guest.enc_status_change_*() return errno Kirill A. Shutemov
2024-02-27 23:33 ` Huang, Kai
2024-02-27 21:24 ` [PATCHv8 07/17] x86/mm: Return correct level from lookup_address() if pte is none Kirill A. Shutemov
2024-02-27 21:24 ` [PATCHv8 08/17] x86/tdx: Account shared memory Kirill A. Shutemov
2024-02-27 23:12 ` Huang, Kai
2024-02-27 21:24 ` [PATCHv8 09/17] x86/mm: Adding callbacks to prepare encrypted memory for kexec Kirill A. Shutemov
2024-02-27 23:16 ` Huang, Kai
2024-02-27 21:24 ` [PATCHv8 10/17] x86/tdx: Convert shared memory back to private on kexec Kirill A. Shutemov
2024-02-27 23:30 ` Huang, Kai
2024-02-27 21:24 ` [PATCHv8 11/17] x86/mm: Make e820_end_ram_pfn() cover E820_TYPE_ACPI ranges Kirill A. Shutemov
2024-02-27 21:24 ` [PATCHv8 12/17] x86/acpi: Rename fields in acpi_madt_multiproc_wakeup structure Kirill A. Shutemov
2024-02-27 21:24 ` [PATCHv8 13/17] x86/acpi: Do not attempt to bring up secondary CPUs in kexec case Kirill A. Shutemov
2024-02-27 21:24 ` Kirill A. Shutemov [this message]
2024-02-27 21:24 ` [PATCHv8 15/17] x86/mm: Introduce kernel_ident_mapping_free() Kirill A. Shutemov
2024-02-27 21:24 ` [PATCHv8 16/17] x86/acpi: Add support for CPU offlining for ACPI MADT wakeup method Kirill A. Shutemov
2024-02-27 21:24 ` [PATCHv8 17/17] ACPI: tables: Print MULTIPROC_WAKEUP when MADT is parsed Kirill A. Shutemov
2024-02-27 21:30 ` Kuppuswamy Sathyanarayanan
2024-02-27 22:08 ` Huang, Kai
2024-02-28 15:22 ` Kirill A. Shutemov
2024-02-28 21:19 ` Huang, Kai
2024-03-06 15:02 ` [PATCHv8 00/17, CORRECTED] x86/tdx: Add kexec support Kirill A. Shutemov
2024-03-07 6:57 ` Tao Liu
2024-03-18 7:02 ` [PATCH v2 0/3] x86/snp: " Ashish Kalra
2024-03-18 7:02 ` [PATCH v2 1/3] efi/x86: skip efi_arch_mem_reserve() in case of kexec Ashish Kalra
2024-03-19 4:00 ` Dave Young
2024-03-24 22:32 ` Kalra, Ashish
2024-03-18 7:02 ` [PATCH v2 2/3] x86/mm: Do not zap page table entries mapping unaccepted memory table during kdump Ashish Kalra
2024-03-21 14:58 ` Kirill A. Shutemov
2024-03-18 7:02 ` [PATCH v2 3/3] x86/snp: Convert shared memory back to private on kexec Ashish Kalra
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