Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 arch/i386/kernel/paravirt.c |    2 ++
 arch/i386/kernel/smpboot.c  |    7 +++++++
 include/asm-i386/paravirt.h |    9 +++++++++
 include/asm-i386/smp.h      |    5 +++++
 4 files changed, 23 insertions(+)

diff -puN arch/i386/kernel/paravirt.c~x86_64-mm-smp-boot-hook-for-paravirt arch/i386/kernel/paravirt.c
--- a/arch/i386/kernel/paravirt.c~x86_64-mm-smp-boot-hook-for-paravirt
+++ a/arch/i386/kernel/paravirt.c
@@ -572,6 +572,8 @@ struct paravirt_ops paravirt_ops = {
 
 	.irq_enable_sysexit = native_irq_enable_sysexit,
 	.iret = native_iret,
+
+	.startup_ipi_hook = (void *)native_nop,
 };
 
 /*
diff -puN arch/i386/kernel/smpboot.c~x86_64-mm-smp-boot-hook-for-paravirt arch/i386/kernel/smpboot.c
--- a/arch/i386/kernel/smpboot.c~x86_64-mm-smp-boot-hook-for-paravirt
+++ a/arch/i386/kernel/smpboot.c
@@ -834,6 +834,13 @@ wakeup_secondary_cpu(int phys_apicid, un
 		num_starts = 0;
 
 	/*
+	 * Paravirt / VMI wants a startup IPI hook here to set up the
+	 * target processor state.
+	 */
+	startup_ipi_hook(phys_apicid, (unsigned long) start_secondary,
+		         (unsigned long) stack_start.esp);
+
+	/*
 	 * Run STARTUP IPI loop.
 	 */
 	Dprintk("#startup loops: %d.\n", num_starts);
diff -puN include/asm-i386/paravirt.h~x86_64-mm-smp-boot-hook-for-paravirt include/asm-i386/paravirt.h
--- a/include/asm-i386/paravirt.h~x86_64-mm-smp-boot-hook-for-paravirt
+++ a/include/asm-i386/paravirt.h
@@ -151,6 +151,8 @@ struct paravirt_ops
 	/* These two are jmp to, not actually called. */
 	void (fastcall *irq_enable_sysexit)(void);
 	void (fastcall *iret)(void);
+
+	void (fastcall *startup_ipi_hook)(int phys_apicid, unsigned long start_eip, unsigned long start_esp);
 };
 
 /* Mark a paravirt probe function. */
@@ -323,6 +325,13 @@ static inline unsigned long apic_read(un
 }
 #endif
 
+#ifdef CONFIG_SMP
+static inline void startup_ipi_hook(int phys_apicid, unsigned long start_eip,
+				    unsigned long start_esp)
+{
+	return paravirt_ops.startup_ipi_hook(phys_apicid, start_eip, start_esp);
+}
+#endif
 
 #define __flush_tlb() paravirt_ops.flush_tlb_user()
 #define __flush_tlb_global() paravirt_ops.flush_tlb_kernel()
diff -puN include/asm-i386/smp.h~x86_64-mm-smp-boot-hook-for-paravirt include/asm-i386/smp.h
--- a/include/asm-i386/smp.h~x86_64-mm-smp-boot-hook-for-paravirt
+++ a/include/asm-i386/smp.h
@@ -52,6 +52,11 @@ extern void cpu_exit_clear(void);
 extern void cpu_uninit(void);
 #endif
 
+#ifndef CONFIG_PARAVIRT
+#define startup_ipi_hook(phys_apicid, start_eip, start_esp) 		\
+do { } while (0)
+#endif
+
 /*
  * This function is needed by all SMP systems. It must _always_ be valid
  * from the initial startup. We map APIC_BASE very early in page_setup(),
_