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b1979a5fda
CR4 manipulation is not protected against interrupts and preemption, but KVM uses smp_function_call to manipulate the X86_CR4_VMXE bit either from the CPU hotplug code or from the kvm_init call. We need to protect the CR4 manipulation from both interrupts and preemption. Original bug report: http://lkml.org/lkml/2008/5/7/48 Bugzilla entry: http://bugzilla.kernel.org/show_bug.cgi?id=10642 This is not a regression from 2.6.25, it's a long standing and hard to trigger bug. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
169 lines
3.8 KiB
C
169 lines
3.8 KiB
C
#ifndef _ASM_X86_TLBFLUSH_H
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#define _ASM_X86_TLBFLUSH_H
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <asm/processor.h>
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#include <asm/system.h>
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#ifdef CONFIG_PARAVIRT
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#include <asm/paravirt.h>
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#else
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#define __flush_tlb() __native_flush_tlb()
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#define __flush_tlb_global() __native_flush_tlb_global()
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#define __flush_tlb_single(addr) __native_flush_tlb_single(addr)
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#endif
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static inline void __native_flush_tlb(void)
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{
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write_cr3(read_cr3());
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}
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static inline void __native_flush_tlb_global(void)
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{
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unsigned long flags;
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unsigned long cr4;
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/*
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* Read-modify-write to CR4 - protect it from preemption and
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* from interrupts. (Use the raw variant because this code can
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* be called from deep inside debugging code.)
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*/
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raw_local_irq_save(flags);
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cr4 = read_cr4();
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/* clear PGE */
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write_cr4(cr4 & ~X86_CR4_PGE);
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/* write old PGE again and flush TLBs */
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write_cr4(cr4);
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raw_local_irq_restore(flags);
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}
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static inline void __native_flush_tlb_single(unsigned long addr)
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{
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asm volatile("invlpg (%0)" ::"r" (addr) : "memory");
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}
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static inline void __flush_tlb_all(void)
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{
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if (cpu_has_pge)
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__flush_tlb_global();
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else
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__flush_tlb();
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}
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static inline void __flush_tlb_one(unsigned long addr)
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{
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if (cpu_has_invlpg)
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__flush_tlb_single(addr);
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else
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__flush_tlb();
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}
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#ifdef CONFIG_X86_32
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# define TLB_FLUSH_ALL 0xffffffff
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#else
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# define TLB_FLUSH_ALL -1ULL
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#endif
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/*
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* TLB flushing:
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*
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* - flush_tlb() flushes the current mm struct TLBs
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* - flush_tlb_all() flushes all processes TLBs
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* - flush_tlb_mm(mm) flushes the specified mm context TLB's
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* - flush_tlb_page(vma, vmaddr) flushes one page
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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_others(cpumask, mm, va) flushes 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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* x86-64 can only flush individual pages or full VMs. For a range flush
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* we always do the full VM. Might be worth trying if for a small
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* range a few INVLPGs in a row are a win.
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*/
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#ifndef CONFIG_SMP
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#define flush_tlb() __flush_tlb()
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#define flush_tlb_all() __flush_tlb_all()
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#define local_flush_tlb() __flush_tlb()
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static inline void flush_tlb_mm(struct mm_struct *mm)
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{
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if (mm == current->active_mm)
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__flush_tlb();
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}
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static inline void flush_tlb_page(struct vm_area_struct *vma,
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unsigned long addr)
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{
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if (vma->vm_mm == current->active_mm)
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__flush_tlb_one(addr);
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}
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static inline void flush_tlb_range(struct vm_area_struct *vma,
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unsigned long start, unsigned long end)
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{
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if (vma->vm_mm == current->active_mm)
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__flush_tlb();
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}
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static inline void native_flush_tlb_others(const cpumask_t *cpumask,
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struct mm_struct *mm,
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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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#define local_flush_tlb() __flush_tlb()
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extern void flush_tlb_all(void);
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extern void flush_tlb_current_task(void);
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extern void flush_tlb_mm(struct mm_struct *);
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extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
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#define flush_tlb() flush_tlb_current_task()
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static inline void flush_tlb_range(struct vm_area_struct *vma,
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unsigned long start, unsigned long end)
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{
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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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#ifdef CONFIG_X86_32
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struct tlb_state {
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struct mm_struct *active_mm;
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int 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
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#endif /* SMP */
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#ifndef CONFIG_PARAVIRT
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#define flush_tlb_others(mask, mm, va) native_flush_tlb_others(&mask, mm, va)
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#endif
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static inline void flush_tlb_kernel_range(unsigned long start,
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unsigned long end)
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{
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flush_tlb_all();
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}
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#endif /* _ASM_X86_TLBFLUSH_H */
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