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authorZachary Amsden <zach@vmware.com>2007-02-13 13:26:21 +0100
committerAndi Kleen <andi@basil.nowhere.org>2007-02-13 13:26:21 +0100
commitae5da273fe3352febd38658d8d34484cbcfb3423 (patch)
tree70f619e6c0195bd2684b897d37bde37daa865c86
parent8b15114434998a78aa50f8559d69c7a400cff267 (diff)
[PATCH] i386: SMP boot hook for paravirt
Add VMI SMP boot hook. We emulate a regular boot sequence and use the same APIC IPI initiation, we just poke magic values to load into the CPU state when the startup IPI is received, rather than having to jump through a real mode trampoline. This is all that was needed to get SMP to work. Signed-off-by: Zachary Amsden <zach@vmware.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: Andi Kleen <ak@suse.de> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Chris Wright <chrisw@sous-sol.org> Signed-off-by: Andrew Morton <akpm@osdl.org>
-rw-r--r--arch/i386/kernel/paravirt.c2
-rw-r--r--arch/i386/kernel/smpboot.c7
-rw-r--r--include/asm-i386/paravirt.h9
-rw-r--r--include/asm-i386/smp.h5
4 files changed, 23 insertions, 0 deletions
diff --git a/arch/i386/kernel/paravirt.c b/arch/i386/kernel/paravirt.c
index 4dfdac4550d..5bf81059a7e 100644
--- a/arch/i386/kernel/paravirt.c
+++ b/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 --git a/arch/i386/kernel/smpboot.c b/arch/i386/kernel/smpboot.c
index 8c6c8c52b95..1908afa265b 100644
--- a/arch/i386/kernel/smpboot.c
+++ b/arch/i386/kernel/smpboot.c
@@ -835,6 +835,13 @@ wakeup_secondary_cpu(int phys_apicid, unsigned long start_eip)
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 --git a/include/asm-i386/paravirt.h b/include/asm-i386/paravirt.h
index 38e5164bd0e..6ccf36499b2 100644
--- a/include/asm-i386/paravirt.h
+++ b/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(unsigned long reg)
}
#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 --git a/include/asm-i386/smp.h b/include/asm-i386/smp.h
index 64fe624c02c..6bf0033a301 100644
--- a/include/asm-i386/smp.h
+++ b/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(),