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Subject[PATCH 2/25] [PATCH] tlb flushing routines
Date
This patch turns the flush_tlb routines into native versions.
In case paravirt is not defined, the natives are defined into
the actually used ones. flush_tlb_others() goes in smp.c, unless
we smp is not in the game

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
arch/x86_64/kernel/smp.c | 10 +++++++++-
include/asm-x86_64/smp.h | 8 ++++++++
include/asm-x86_64/tlbflush.h | 22 ++++++++++++++++++----
3 files changed, 35 insertions(+), 5 deletions(-)
diff --git a/arch/x86_64/kernel/smp.c b/arch/x86_64/kernel/smp.c
index 673a300..39f5f6b 100644
--- a/arch/x86_64/kernel/smp.c
+++ b/arch/x86_64/kernel/smp.c
@@ -165,7 +165,7 @@ out:
cpu_clear(cpu, f->flush_cpumask);
}

-static void flush_tlb_others(cpumask_t cpumask, struct mm_struct *mm,
+void native_flush_tlb_others(cpumask_t cpumask, struct mm_struct *mm,
unsigned long va)
{
int sender;
@@ -198,6 +198,14 @@ static void flush_tlb_others(cpumask_t cpumask, struct mm_struct *mm,
spin_unlock(&f->tlbstate_lock);
}

+/* Overriden in paravirt.c if CONFIG_PARAVIRT */
+void __attribute__((weak)) flush_tlb_others(cpumask_t cpumask,
+ struct mm_struct *mm,
+ unsigned long va)
+{
+ native_flush_tlb_others(cpumask, mm, va);
+}
+
int __cpuinit init_smp_flush(void)
{
int i;
diff --git a/include/asm-x86_64/smp.h b/include/asm-x86_64/smp.h
index 3f303d2..6b11114 100644
--- a/include/asm-x86_64/smp.h
+++ b/include/asm-x86_64/smp.h
@@ -19,6 +19,14 @@ extern int disable_apic;

#include <asm/pda.h>

+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+void native_flush_tlb_others(cpumask_t cpumask, struct mm_struct *mm,
+ unsigned long va);
+#else
+#define startup_ipi_hook(apicid, rip, rsp) do { } while (0)
+#endif
+
struct pt_regs;

extern cpumask_t cpu_present_mask;
diff --git a/include/asm-x86_64/tlbflush.h b/include/asm-x86_64/tlbflush.h
index 888eb4a..1c68cc8 100644
--- a/include/asm-x86_64/tlbflush.h
+++ b/include/asm-x86_64/tlbflush.h
@@ -6,21 +6,30 @@
#include <asm/processor.h>
#include <asm/system.h>

-static inline void __flush_tlb(void)
+static inline void native_flush_tlb(void)
{
write_cr3(read_cr3());
}

-static inline void __flush_tlb_all(void)
+static inline void native_flush_tlb_all(void)
{
unsigned long cr4 = read_cr4();
write_cr4(cr4 & ~X86_CR4_PGE); /* clear PGE */
write_cr4(cr4); /* write old PGE again and flush TLBs */
}

-#define __flush_tlb_one(addr) \
- __asm__ __volatile__("invlpg (%0)" :: "r" (addr) : "memory")
+static inline void native_flush_tlb_one(unsigned long addr)
+{
+ asm volatile ("invlpg (%0)" :: "r" (addr) : "memory");
+}

+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+#else
+#define __flush_tlb() native_flush_tlb()
+#define __flush_tlb_all() native_flush_tlb_all()
+#define __flush_tlb_one(addr) native_flush_tlb_one(addr)
+#endif /* CONFIG_PARAVIRT */

/*
* TLB flushing:
@@ -64,6 +73,11 @@ static inline void flush_tlb_range(struct vm_area_struct *vma,
__flush_tlb();
}

+static inline void native_flush_tlb_others(cpumask_t *cpumask,
+ struct mm_struct *mm, unsigned long va)
+{
+}
+
#else

#include <asm/smp.h>
--
1.4.4.2
-
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