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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/arch/x86/kernel/reboot.c
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@@ -10,14 +10,14 @@
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 #include <linux/sched.h>
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 #include <linux/tboot.h>
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 #include <linux/delay.h>
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-#include <linux/frame.h>
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+#include <linux/objtool.h>
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+#include <linux/pgtable.h>
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 #include <acpi/reboot.h>
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 #include <asm/io.h>
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 #include <asm/apic.h>
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 #include <asm/io_apic.h>
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 #include <asm/desc.h>
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 #include <asm/hpet.h>
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-#include <asm/pgtable.h>
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 #include <asm/proto.h>
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 #include <asm/reboot_fixups.h>
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 #include <asm/reboot.h>
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@@ -113,17 +113,9 @@
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 	spin_unlock(&rtc_lock);
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 	/*
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-	 * Switch back to the initial page table.
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+	 * Switch to the trampoline page table.
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 	 */
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-#ifdef CONFIG_X86_32
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-	load_cr3(initial_page_table);
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-#else
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-	write_cr3(real_mode_header->trampoline_pgd);
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-
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-	/* Exiting long mode will fail if CR4.PCIDE is set. */
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-	if (static_cpu_has(X86_FEATURE_PCID))
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-		cr4_clear_bits(X86_CR4_PCIDE);
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-#endif
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+	load_trampoline_pgtable();
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 	/* Jump to the identity-mapped low memory code */
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 #ifdef CONFIG_X86_32
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@@ -563,7 +555,6 @@
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 		/* Halt and exit VMX root operation on the other CPUs. */
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 		nmi_shootdown_cpus(vmxoff_nmi);
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-
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 	}
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 }
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@@ -655,7 +646,7 @@
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 		case BOOT_CF9_FORCE:
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 			port_cf9_safe = true;
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-			/* Fall through */
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+			fallthrough;
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 		case BOOT_CF9_SAFE:
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 			if (port_cf9_safe) {
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@@ -837,11 +828,6 @@
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 	return NMI_HANDLED;
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 }
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-static void smp_send_nmi_allbutself(void)
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-{
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-	apic->send_IPI_allbutself(NMI_VECTOR);
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-}
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-
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 /*
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  * Halt all other CPUs, calling the specified function on each of them
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  *
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@@ -870,7 +856,7 @@
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 	 */
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 	wmb();
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-	smp_send_nmi_allbutself();
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+	apic_send_IPI_allbutself(NMI_VECTOR);
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 	/* Kick CPUs looping in NMI context. */
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 	WRITE_ONCE(crash_ipi_issued, 1);