Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=ae5da273fe3352febd38658d8d34484cbcfb3423
Commit: ae5da273fe3352febd38658d8d34484cbcfb3423
Parent: 8b15114434998a78aa50f8559d69c7a400cff267
Author: Zachary Amsden <[EMAIL PROTECTED]>
AuthorDate: Tue Feb 13 13:26:21 2007 +0100
Committer: Andi Kleen <[EMAIL PROTECTED]>
CommitDate: Tue Feb 13 13:26:21 2007 +0100
[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 <[EMAIL PROTECTED]>
Signed-off-by: Andi Kleen <[EMAIL PROTECTED]>
Cc: Andi Kleen <[EMAIL PROTECTED]>
Cc: Jeremy Fitzhardinge <[EMAIL PROTECTED]>
Cc: Rusty Russell <[EMAIL PROTECTED]>
Cc: Chris Wright <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
---
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(+), 0 deletions(-)
diff --git a/arch/i386/kernel/paravirt.c b/arch/i386/kernel/paravirt.c
index 4dfdac4..5bf8105 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 8c6c8c5..1908afa 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 38e5164..6ccf364 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 64fe624..6bf0033 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(),
-
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