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| author |   Jeremy Fitzhardinge <jeremy@goop.org> | 2007-05-02 19:27:15 +0200 |
|---|---|---|
| committer |   Andi Kleen <andi@basil.nowhere.org> | 2007-05-02 19:27:15 +0200 |
| commit | d4c104771a1c58e3de2a888b73b0ba1b54c0ae76 (patch) | |
| tree | 77ca2c6771e946aa926cb21c06702fdc7d230364 /arch/i386/kernel/smp.c | |
| parent | [PATCH] i386: PARAVIRT: add common patching machinery (diff) | |
| download | linux-dev-d4c104771a1c58e3de2a888b73b0ba1b54c0ae76.tar.xz linux-dev-d4c104771a1c58e3de2a888b73b0ba1b54c0ae76.zip | |
[PATCH] i386: PARAVIRT: add flush_tlb_others paravirt_op
This patch adds a pv_op for flush_tlb_others. Linux running on native
hardware uses cross-CPU IPIs to flush the TLB on any CPU which may
have a particular mm's pagetable entries cached in its TLB. This is
inefficient in a paravirtualized environment, since the hypervisor
knows which real CPUs actually contain cached mappings, which may be a
small subset of a guest's VCPUs.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to '')
| -rw-r--r-- | arch/i386/kernel/smp.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/arch/i386/kernel/smp.c b/arch/i386/kernel/smp.c index 9d84f6f001bf..892cd64130bc 100644 --- a/arch/i386/kernel/smp.c +++ b/arch/i386/kernel/smp.c @@ -256,7 +256,6 @@ static cpumask_t flush_cpumask; static struct mm_struct * flush_mm; static unsigned long flush_va; static DEFINE_SPINLOCK(tlbstate_lock); -#define FLUSH_ALL 0xffffffff /* * We cannot call mmdrop() because we are in interrupt context, @@ -338,7 +337,7 @@ fastcall void smp_invalidate_interrupt(struct pt_regs *regs) if (flush_mm == per_cpu(cpu_tlbstate, cpu).active_mm) { if (per_cpu(cpu_tlbstate, cpu).state == TLBSTATE_OK) { - if (flush_va == FLUSH_ALL) + if (flush_va == TLB_FLUSH_ALL) local_flush_tlb(); else __flush_tlb_one(flush_va); @@ -353,9 +352,11 @@ out: put_cpu_no_resched(); } -static void flush_tlb_others(cpumask_t cpumask, struct mm_struct *mm, - unsigned long va) +void native_flush_tlb_others(const cpumask_t *cpumaskp, struct mm_struct *mm, + unsigned long va) { + cpumask_t cpumask = *cpumaskp; + /* * A couple of (to be removed) sanity checks: * @@ -417,7 +418,7 @@ void flush_tlb_current_task(void) local_flush_tlb(); if (!cpus_empty(cpu_mask)) - flush_tlb_others(cpu_mask, mm, FLUSH_ALL); + flush_tlb_others(cpu_mask, mm, TLB_FLUSH_ALL); preempt_enable(); } @@ -436,7 +437,7 @@ void flush_tlb_mm (struct mm_struct * mm) leave_mm(smp_processor_id()); } if (!cpus_empty(cpu_mask)) - flush_tlb_others(cpu_mask, mm, FLUSH_ALL); + flush_tlb_others(cpu_mask, mm, TLB_FLUSH_ALL); preempt_enable(); } |