forked from Minki/linux
[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>
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@ -300,6 +300,7 @@ struct paravirt_ops paravirt_ops = {
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.flush_tlb_user = native_flush_tlb,
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.flush_tlb_kernel = native_flush_tlb_global,
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.flush_tlb_single = native_flush_tlb_single,
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.flush_tlb_others = native_flush_tlb_others,
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.map_pt_hook = paravirt_nop,
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@ -256,7 +256,6 @@ static cpumask_t flush_cpumask;
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static struct mm_struct * flush_mm;
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static unsigned long flush_va;
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static DEFINE_SPINLOCK(tlbstate_lock);
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#define FLUSH_ALL 0xffffffff
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/*
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* We cannot call mmdrop() because we are in interrupt context,
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@ -338,7 +337,7 @@ fastcall void smp_invalidate_interrupt(struct pt_regs *regs)
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if (flush_mm == per_cpu(cpu_tlbstate, cpu).active_mm) {
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if (per_cpu(cpu_tlbstate, cpu).state == TLBSTATE_OK) {
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if (flush_va == FLUSH_ALL)
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if (flush_va == TLB_FLUSH_ALL)
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local_flush_tlb();
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else
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__flush_tlb_one(flush_va);
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@ -353,9 +352,11 @@ out:
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put_cpu_no_resched();
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}
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static void flush_tlb_others(cpumask_t cpumask, struct mm_struct *mm,
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void native_flush_tlb_others(const cpumask_t *cpumaskp, struct mm_struct *mm,
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unsigned long va)
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{
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cpumask_t cpumask = *cpumaskp;
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/*
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* A couple of (to be removed) sanity checks:
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*
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@ -417,7 +418,7 @@ void flush_tlb_current_task(void)
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local_flush_tlb();
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if (!cpus_empty(cpu_mask))
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flush_tlb_others(cpu_mask, mm, FLUSH_ALL);
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flush_tlb_others(cpu_mask, mm, TLB_FLUSH_ALL);
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preempt_enable();
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}
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@ -436,7 +437,7 @@ void flush_tlb_mm (struct mm_struct * mm)
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leave_mm(smp_processor_id());
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}
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if (!cpus_empty(cpu_mask))
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flush_tlb_others(cpu_mask, mm, FLUSH_ALL);
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flush_tlb_others(cpu_mask, mm, TLB_FLUSH_ALL);
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preempt_enable();
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}
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@ -15,6 +15,7 @@
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#ifndef __ASSEMBLY__
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#include <linux/types.h>
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#include <linux/cpumask.h>
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struct thread_struct;
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struct Xgt_desc_struct;
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@ -165,6 +166,8 @@ struct paravirt_ops
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void (*flush_tlb_user)(void);
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void (*flush_tlb_kernel)(void);
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void (*flush_tlb_single)(unsigned long addr);
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void (*flush_tlb_others)(const cpumask_t *cpus, struct mm_struct *mm,
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unsigned long va);
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void (*map_pt_hook)(int type, pte_t *va, u32 pfn);
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@ -853,6 +856,12 @@ static inline void __flush_tlb_single(unsigned long addr)
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PVOP_VCALL1(flush_tlb_single, addr);
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}
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static inline void flush_tlb_others(cpumask_t cpumask, struct mm_struct *mm,
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unsigned long va)
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{
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PVOP_VCALL3(flush_tlb_others, &cpumask, mm, va);
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}
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static inline void paravirt_map_pt_hook(int type, pte_t *va, u32 pfn)
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{
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PVOP_VCALL3(map_pt_hook, type, va, pfn);
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@ -79,11 +79,15 @@
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* - flush_tlb_range(vma, start, end) flushes a range of pages
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* - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
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* - flush_tlb_pgtables(mm, start, end) flushes a range of page tables
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* - flush_tlb_others(cpumask, mm, va) flushes a TLBs on other cpus
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*
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* ..but the i386 has somewhat limited tlb flushing capabilities,
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* and page-granular flushes are available only on i486 and up.
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*/
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#define TLB_FLUSH_ALL 0xffffffff
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#ifndef CONFIG_SMP
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#define flush_tlb() __flush_tlb()
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@ -110,7 +114,12 @@ static inline void flush_tlb_range(struct vm_area_struct *vma,
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__flush_tlb();
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}
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#else
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static inline void native_flush_tlb_others(const cpumask_t *cpumask,
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struct mm_struct *mm, unsigned long va)
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{
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}
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#else /* SMP */
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#include <asm/smp.h>
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@ -129,6 +138,9 @@ static inline void flush_tlb_range(struct vm_area_struct * vma, unsigned long st
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flush_tlb_mm(vma->vm_mm);
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}
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void native_flush_tlb_others(const cpumask_t *cpumask, struct mm_struct *mm,
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unsigned long va);
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#define TLBSTATE_OK 1
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#define TLBSTATE_LAZY 2
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@ -139,8 +151,11 @@ struct tlb_state
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char __cacheline_padding[L1_CACHE_BYTES-8];
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};
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DECLARE_PER_CPU(struct tlb_state, cpu_tlbstate);
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#endif /* SMP */
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#ifndef CONFIG_PARAVIRT
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#define flush_tlb_others(mask, mm, va) \
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native_flush_tlb_others(&mask, mm, va)
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#endif
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#define flush_tlb_kernel_range(start, end) flush_tlb_all()
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