diff options
| -rw-r--r-- | arch/x86/kernel/paravirt_32.c | 58 | ||||
| -rw-r--r-- | arch/x86/kernel/vmi_32.c | 39 | ||||
| -rw-r--r-- | arch/x86/xen/enlighten.c | 40 | ||||
| -rw-r--r-- | arch/x86/xen/mmu.c | 2 | ||||
| -rw-r--r-- | arch/x86/xen/multicalls.h | 2 | ||||
| -rw-r--r-- | arch/x86/xen/xen-ops.h | 7 | ||||
| -rw-r--r-- | drivers/lguest/lguest.c | 32 | ||||
| -rw-r--r-- | include/asm-x86/paravirt.h | 52 |
8 files changed, 134 insertions, 98 deletions
diff --git a/arch/x86/kernel/paravirt_32.c b/arch/x86/kernel/paravirt_32.c index fa412515af7..6a80d67c212 100644 --- a/arch/x86/kernel/paravirt_32.c +++ b/arch/x86/kernel/paravirt_32.c @@ -164,7 +164,6 @@ static void *get_call_destination(u8 type) { struct paravirt_patch_template tmpl = { .pv_init_ops = pv_init_ops, - .pv_misc_ops = pv_misc_ops, .pv_time_ops = pv_time_ops, .pv_cpu_ops = pv_cpu_ops, .pv_irq_ops = pv_irq_ops, @@ -282,6 +281,49 @@ int paravirt_disable_iospace(void) return ret; } +static DEFINE_PER_CPU(enum paravirt_lazy_mode, paravirt_lazy_mode) = PARAVIRT_LAZY_NONE; + +static inline void enter_lazy(enum paravirt_lazy_mode mode) +{ + BUG_ON(x86_read_percpu(paravirt_lazy_mode) != PARAVIRT_LAZY_NONE); + BUG_ON(preemptible()); + + x86_write_percpu(paravirt_lazy_mode, mode); +} + +void paravirt_leave_lazy(enum paravirt_lazy_mode mode) +{ + BUG_ON(x86_read_percpu(paravirt_lazy_mode) != mode); + BUG_ON(preemptible()); + + x86_write_percpu(paravirt_lazy_mode, PARAVIRT_LAZY_NONE); +} + +void paravirt_enter_lazy_mmu(void) +{ + enter_lazy(PARAVIRT_LAZY_MMU); +} + +void paravirt_leave_lazy_mmu(void) +{ + paravirt_leave_lazy(PARAVIRT_LAZY_MMU); +} + +void paravirt_enter_lazy_cpu(void) +{ + enter_lazy(PARAVIRT_LAZY_CPU); +} + +void paravirt_leave_lazy_cpu(void) +{ + paravirt_leave_lazy(PARAVIRT_LAZY_CPU); +} + +enum paravirt_lazy_mode paravirt_get_lazy_mode(void) +{ + return x86_read_percpu(paravirt_lazy_mode); +} + struct pv_info pv_info = { .name = "bare hardware", .paravirt_enabled = 0, @@ -347,6 +389,11 @@ struct pv_cpu_ops pv_cpu_ops = { .set_iopl_mask = native_set_iopl_mask, .io_delay = native_io_delay, + + .lazy_mode = { + .enter = paravirt_nop, + .leave = paravirt_nop, + }, }; struct pv_apic_ops pv_apic_ops = { @@ -360,10 +407,6 @@ struct pv_apic_ops pv_apic_ops = { #endif }; -struct pv_misc_ops pv_misc_ops = { - .set_lazy_mode = paravirt_nop, -}; - struct pv_mmu_ops pv_mmu_ops = { .pagetable_setup_start = native_pagetable_setup_start, .pagetable_setup_done = native_pagetable_setup_done, @@ -414,6 +457,11 @@ struct pv_mmu_ops pv_mmu_ops = { .dup_mmap = paravirt_nop, .exit_mmap = paravirt_nop, .activate_mm = paravirt_nop, + + .lazy_mode = { + .enter = paravirt_nop, + .leave = paravirt_nop, + }, }; EXPORT_SYMBOL_GPL(pv_time_ops); diff --git a/arch/x86/kernel/vmi_32.c b/arch/x86/kernel/vmi_32.c index 67cea5c2e3e..f02bad68aba 100644 --- a/arch/x86/kernel/vmi_32.c +++ b/arch/x86/kernel/vmi_32.c @@ -552,24 +552,22 @@ vmi_startup_ipi_hook(int phys_apicid, unsigned long start_eip, } #endif -static void vmi_set_lazy_mode(enum paravirt_lazy_mode mode) +static void vmi_enter_lazy_cpu(void) { - static DEFINE_PER_CPU(enum paravirt_lazy_mode, lazy_mode); - - if (!vmi_ops.set_lazy_mode) - return; + paravirt_enter_lazy_cpu(); + vmi_ops.set_lazy_mode(2); +} - /* Modes should never nest or overlap */ - BUG_ON(__get_cpu_var(lazy_mode) && !(mode == PARAVIRT_LAZY_NONE || - mode == PARAVIRT_LAZY_FLUSH)); +static void vmi_enter_lazy_mmu(void) +{ + paravirt_enter_lazy_mmu(); + vmi_ops.set_lazy_mode(1); +} - if (mode == PARAVIRT_LAZY_FLUSH) { - vmi_ops.set_lazy_mode(0); - vmi_ops.set_lazy_mode(__get_cpu_var(lazy_mode)); - } else { - vmi_ops.set_lazy_mode(mode); - __get_cpu_var(lazy_mode) = mode; - } +static void vmi_leave_lazy(void) +{ + paravirt_leave_lazy(paravirt_get_lazy_mode()); + vmi_ops.set_lazy_mode(0); } static inline int __init check_vmi_rom(struct vrom_header *rom) @@ -798,7 +796,16 @@ static inline int __init activate_vmi(void) para_wrap(pv_cpu_ops.load_esp0, vmi_load_esp0, set_kernel_stack, UpdateKernelStack); para_fill(pv_cpu_ops.set_iopl_mask, SetIOPLMask); para_fill(pv_cpu_ops.io_delay, IODelay); - para_wrap(pv_misc_ops.set_lazy_mode, vmi_set_lazy_mode, set_lazy_mode, SetLazyMode); + + para_wrap(pv_cpu_ops.lazy_mode.enter, vmi_enter_lazy_cpu, + set_lazy_mode, SetLazyMode); + para_wrap(pv_cpu_ops.lazy_mode.leave, vmi_leave_lazy, + set_lazy_mode, SetLazyMode); + + para_wrap(pv_mmu_ops.lazy_mode.enter, vmi_enter_lazy_mmu, + set_lazy_mode, SetLazyMode); + para_wrap(pv_mmu_ops.lazy_mode.leave, vmi_leave_lazy, + set_lazy_mode, SetLazyMode); /* user and kernel flush are just handled with different flags to FlushTLB */ para_wrap(pv_mmu_ops.flush_tlb_user, vmi_flush_tlb_user, _flush_tlb, FlushTLB); diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 3d3bf05dec7..7171a073607 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -52,8 +52,6 @@ EXPORT_SYMBOL_GPL(hypercall_page); -DEFINE_PER_CPU(enum paravirt_lazy_mode, xen_lazy_mode); - DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu); DEFINE_PER_CPU(struct vcpu_info, xen_vcpu_info); DEFINE_PER_CPU(unsigned long, xen_cr3); @@ -249,29 +247,10 @@ static void xen_halt(void) xen_safe_halt(); } -static void xen_set_lazy_mode(enum paravirt_lazy_mode mode) +static void xen_leave_lazy(void) { - BUG_ON(preemptible()); - - switch (mode) { - case PARAVIRT_LAZY_NONE: - BUG_ON(x86_read_percpu(xen_lazy_mode) == PARAVIRT_LAZY_NONE); - break; - - case PARAVIRT_LAZY_MMU: - case PARAVIRT_LAZY_CPU: - BUG_ON(x86_read_percpu(xen_lazy_mode) != PARAVIRT_LAZY_NONE); - break; - - case PARAVIRT_LAZY_FLUSH: - /* flush if necessary, but don't change state */ - if (x86_read_percpu(xen_lazy_mode) != PARAVIRT_LAZY_NONE) - xen_mc_flush(); - return; - } - + paravirt_leave_lazy(paravirt_get_lazy_mode()); xen_mc_flush(); - x86_write_percpu(xen_lazy_mode, mode); } static unsigned long xen_store_tr(void) @@ -358,7 +337,7 @@ static void xen_load_tls(struct thread_struct *t, unsigned int cpu) * loaded properly. This will go away as soon as Xen has been * modified to not save/restore %gs for normal hypercalls. */ - if (xen_get_lazy_mode() == PARAVIRT_LAZY_CPU) + if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU) loadsegment(gs, 0); } @@ -962,6 +941,11 @@ static const struct pv_cpu_ops xen_cpu_ops __initdata = { .set_iopl_mask = xen_set_iopl_mask, .io_delay = xen_io_delay, + + .lazy_mode = { + .enter = paravirt_enter_lazy_cpu, + .leave = xen_leave_lazy, + }, }; static const struct pv_irq_ops xen_irq_ops __initdata = { @@ -1037,10 +1021,11 @@ static const struct pv_mmu_ops xen_mmu_ops __initdata = { .activate_mm = xen_activate_mm, .dup_mmap = xen_dup_mmap, .exit_mmap = xen_exit_mmap, -}; -static const struct pv_misc_ops xen_misc_ops __initdata = { - .set_lazy_mode = xen_set_lazy_mode, + .lazy_mode = { + .enter = paravirt_enter_lazy_mmu, + .leave = xen_leave_lazy, + }, }; #ifdef CONFIG_SMP @@ -1114,7 +1099,6 @@ asmlinkage void __init xen_start_kernel(void) pv_irq_ops = xen_irq_ops; pv_apic_ops = xen_apic_ops; pv_mmu_ops = xen_mmu_ops; - pv_misc_ops = xen_misc_ops; machine_ops = xen_machine_ops; diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c index 874db0cd1d2..2061bdd3e7d 100644 --- a/arch/x86/xen/mmu.c +++ b/arch/x86/xen/mmu.c @@ -155,7 +155,7 @@ void xen_set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pteval) { if (mm == current->mm || mm == &init_mm) { - if (xen_get_lazy_mode() == PARAVIRT_LAZY_MMU) { + if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU) { struct multicall_space mcs; mcs = xen_mc_entry(0); diff --git a/arch/x86/xen/multicalls.h b/arch/x86/xen/multicalls.h index e6f7530b156..5d96a5fa210 100644 --- a/arch/x86/xen/multicalls.h +++ b/arch/x86/xen/multicalls.h @@ -35,7 +35,7 @@ void xen_mc_flush(void); /* Issue a multicall if we're not in a lazy mode */ static inline void xen_mc_issue(unsigned mode) { - if ((xen_get_lazy_mode() & mode) == 0) + if ((paravirt_get_lazy_mode() & mode) == 0) xen_mc_flush(); /* restore flags saved in xen_mc_batch */ diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h index b9aaea45f07..b5697bae52d 100644 --- a/arch/x86/xen/xen-ops.h +++ b/arch/x86/xen/xen-ops.h @@ -29,13 +29,6 @@ unsigned long long xen_sched_clock(void); void xen_mark_init_mm_pinned(void); -DECLARE_PER_CPU(enum paravirt_lazy_mode, xen_lazy_mode); - -static inline unsigned xen_get_lazy_mode(void) -{ - return x86_read_percpu(xen_lazy_mode); -} - void __init xen_fill_possible_map(void); void __init xen_setup_vcpu_info_placement(void); diff --git a/drivers/lguest/lguest.c b/drivers/lguest/lguest.c index ca9b844f37c..c302629e089 100644 --- a/drivers/lguest/lguest.c +++ b/drivers/lguest/lguest.c @@ -97,29 +97,17 @@ static cycle_t clock_base; * them as a batch when lazy_mode is eventually turned off. Because hypercalls * are reasonably expensive, batching them up makes sense. For example, a * large mmap might update dozens of page table entries: that code calls - * lguest_lazy_mode(PARAVIRT_LAZY_MMU), does the dozen updates, then calls - * lguest_lazy_mode(PARAVIRT_LAZY_NONE). + * paravirt_enter_lazy_mmu(), does the dozen updates, then calls + * lguest_leave_lazy_mode(). * * So, when we're in lazy mode, we call async_hypercall() to store the call for * future processing. When lazy mode is turned off we issue a hypercall to * flush the stored calls. - * - * There's also a hack where "mode" is set to "PARAVIRT_LAZY_FLUSH" which - * indicates we're to flush any outstanding calls immediately. This is used - * when an interrupt handler does a kmap_atomic(): the page table changes must - * happen immediately even if we're in the middle of a batch. Usually we're - * not, though, so there's nothing to do. */ -static enum paravirt_lazy_mode lazy_mode; /* Note: not SMP-safe! */ -static void lguest_lazy_mode(enum paravirt_lazy_mode mode) + */ +static void lguest_leave_lazy_mode(void) { - if (mode == PARAVIRT_LAZY_FLUSH) { - if (unlikely(lazy_mode != PARAVIRT_LAZY_NONE)) - hcall(LHCALL_FLUSH_ASYNC, 0, 0, 0); - } else { - lazy_mode = mode; - if (mode == PARAVIRT_LAZY_NONE) - hcall(LHCALL_FLUSH_ASYNC, 0, 0, 0); - } + paravirt_leave_lazy(paravirt_get_lazy_mode()); + hcall(LHCALL_FLUSH_ASYNC, 0, 0, 0); } static void lazy_hcall(unsigned long call, @@ -127,7 +115,7 @@ static void lazy_hcall(unsigned long call, unsigned long arg2, unsigned long arg3) { - if (lazy_mode == PARAVIRT_LAZY_NONE) + if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_NONE) hcall(call, arg1, arg2, arg3); else async_hcall(call, arg1, arg2, arg3); @@ -1011,6 +999,8 @@ __init void lguest_init(void *boot) pv_cpu_ops.write_gdt_entry = lguest_write_gdt_entry; pv_cpu_ops.write_idt_entry = lguest_write_idt_entry; pv_cpu_ops.wbinvd = lguest_wbinvd; + pv_cpu_ops.lazy_mode.enter = paravirt_enter_lazy_cpu; + pv_cpu_ops.lazy_mode.leave = lguest_leave_lazy_mode; /* pagetable management */ pv_mmu_ops.write_cr3 = lguest_write_cr3; @@ -1022,6 +1012,8 @@ __init void lguest_init(void *boot) pv_mmu_ops.set_pmd = lguest_set_pmd; pv_mmu_ops.read_cr2 = lguest_read_cr2; pv_mmu_ops.read_cr3 = lguest_read_cr3; + pv_mmu_ops.lazy_mode.enter = paravirt_enter_lazy_mmu; + pv_mmu_ops.lazy_mode.leave = lguest_leave_lazy_mode; #ifdef CONFIG_X86_LOCAL_APIC /* apic read/write intercepts */ @@ -1034,8 +1026,6 @@ __init void lguest_init(void *boot) pv_time_ops.get_wallclock = lguest_get_wallclock; pv_time_ops.time_init = lguest_time_init; - pv_misc_ops.set_lazy_mode = lguest_lazy_mode; - /* Now is a good time to look at the implementations of these functions * before returning to the rest of lguest_init(). */ diff --git a/include/asm-x86/paravirt.h b/include/asm-x86/paravirt.h index 19726e12051..f59d370c5df 100644 --- a/include/asm-x86/paravirt.h +++ b/include/asm-x86/paravirt.h @@ -25,15 +25,6 @@ struct tss_struct; struct mm_struct; struct desc_struct; -/* Lazy mode for batching updates / context switch */ -enum paravirt_lazy_mode { - PARAVIRT_LAZY_NONE = 0, - PARAVIRT_LAZY_MMU = 1, - PARAVIRT_LAZY_CPU = 2, - PARAVIRT_LAZY_FLUSH = 3, -}; - - /* general info */ struct pv_info { unsigned int kernel_rpl; @@ -64,9 +55,10 @@ struct pv_init_ops { }; -struct pv_misc_ops { +struct pv_lazy_ops { /* Set deferred update mode, used for batching operations. */ - void (*set_lazy_mode)(enum paravirt_lazy_mode mode); + void (*enter)(void); + void (*leave)(void); }; struct pv_time_ops { @@ -131,6 +123,8 @@ struct pv_cpu_ops { /* These two are jmp to, not actually called. */ void (*irq_enable_sysexit)(void); void (*iret)(void); + + struct pv_lazy_ops lazy_mode; }; struct pv_irq_ops { @@ -244,6 +238,8 @@ struct pv_mmu_ops { #ifdef CONFIG_HIGHPTE void *(*kmap_atomic_pte)(struct page *page, enum km_type type); #endif + + struct pv_lazy_ops lazy_mode; }; /* This contains all the paravirt structures: we get a convenient @@ -252,7 +248,6 @@ struct pv_mmu_ops { struct paravirt_patch_template { struct pv_init_ops pv_init_ops; - struct pv_misc_ops pv_misc_ops; struct pv_time_ops pv_time_ops; struct pv_cpu_ops pv_cpu_ops; struct pv_irq_ops pv_irq_ops; @@ -262,7 +257,6 @@ struct paravirt_patch_template extern struct pv_info pv_info; extern struct pv_init_ops pv_init_ops; -extern struct pv_misc_ops pv_misc_ops; extern struct pv_time_ops pv_time_ops; extern struct pv_cpu_ops pv_cpu_ops; extern struct pv_irq_ops pv_irq_ops; @@ -953,37 +947,57 @@ static inline void set_pmd(pmd_t *pmdp, pmd_t pmdval) } #endif /* CONFIG_X86_PAE */ +/* Lazy mode for batching updates / context switch */ +enum paravirt_lazy_mode { + PARAVIRT_LAZY_NONE, + PARAVIRT_LAZY_MMU, + PARAVIRT_LAZY_CPU, +}; + +enum paravirt_lazy_mode paravirt_get_lazy_mode(void); +void paravirt_enter_lazy_cpu(void); +void paravirt_leave_lazy_cpu(void); +void paravirt_enter_lazy_mmu(void); +void paravirt_leave_lazy_mmu(void); +void paravirt_leave_lazy(enum paravirt_lazy_mode mode); + #define __HAVE_ARCH_ENTER_LAZY_CPU_MODE static inline void arch_enter_lazy_cpu_mode(void) { - PVOP_VCALL1(pv_misc_ops.set_lazy_mode, PARAVIRT_LAZY_CPU); + PVOP_VCALL0(pv_cpu_ops.lazy_mode.enter); } static inline void arch_leave_lazy_cpu_mode(void) { - PVOP_VCALL1(pv_misc_ops.set_lazy_mode, PARAVIRT_LAZY_NONE); + PVOP_VCALL0(pv_cpu_ops.lazy_mode.leave); } static inline void arch_flush_lazy_cpu_mode(void) { - PVOP_VCALL1(pv_misc_ops.set_lazy_mode, PARAVIRT_LAZY_FLUSH); + if (unlikely(paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU)) { + arch_leave_lazy_cpu_mode(); + arch_enter_lazy_cpu_mode(); + } } #define __HAVE_ARCH_ENTER_LAZY_MMU_MODE static inline void arch_enter_lazy_mmu_mode(void) { - PVOP_VCALL1(pv_misc_ops.set_lazy_mode, PARAVIRT_LAZY_MMU); + PVOP_VCALL0(pv_mmu_ops.lazy_mode.enter); } static inline void arch_leave_lazy_mmu_mode(void) { - PVOP_VCALL1(pv_misc_ops.set_lazy_mode, PARAVIRT_LAZY_NONE); + PVOP_VCALL0(pv_mmu_ops.lazy_mode.leave); } static inline void arch_flush_lazy_mmu_mode(void) { - PVOP_VCALL1(pv_misc_ops.set_lazy_mode, PARAVIRT_LAZY_FLUSH); + if (unlikely(paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU)) { + arch_leave_lazy_mmu_mode(); + arch_enter_lazy_mmu_mode(); + } } void _paravirt_nop(void); |