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-rw-r--r--arch/x86/hyperv/mmu.c10
-rw-r--r--arch/x86/include/asm/paravirt.h6
-rw-r--r--arch/x86/include/asm/paravirt_types.h4
-rw-r--r--arch/x86/include/asm/tlbflush.h48
-rw-r--r--arch/x86/include/asm/trace/hyperv.h2
-rw-r--r--arch/x86/kernel/alternative.c2
-rw-r--r--arch/x86/kernel/kvm.c11
-rw-r--r--arch/x86/kernel/paravirt.c2
-rw-r--r--arch/x86/mm/init.c2
-rw-r--r--arch/x86/mm/tlb.c176
-rw-r--r--arch/x86/xen/mmu_pv.c11
11 files changed, 158 insertions, 116 deletions
diff --git a/arch/x86/hyperv/mmu.c b/arch/x86/hyperv/mmu.c
index c0ba8874d9cb..bd13736d0c05 100644
--- a/arch/x86/hyperv/mmu.c
+++ b/arch/x86/hyperv/mmu.c
@@ -52,8 +52,8 @@ static inline int fill_gva_list(u64 gva_list[], int offset,
return gva_n - offset;
}
-static void hyperv_flush_tlb_others(const struct cpumask *cpus,
- const struct flush_tlb_info *info)
+static void hyperv_flush_tlb_multi(const struct cpumask *cpus,
+ const struct flush_tlb_info *info)
{
int cpu, vcpu, gva_n, max_gvas;
struct hv_tlb_flush **flush_pcpu;
@@ -61,7 +61,7 @@ static void hyperv_flush_tlb_others(const struct cpumask *cpus,
u64 status;
unsigned long flags;
- trace_hyperv_mmu_flush_tlb_others(cpus, info);
+ trace_hyperv_mmu_flush_tlb_multi(cpus, info);
if (!hv_hypercall_pg)
goto do_native;
@@ -164,7 +164,7 @@ check_status:
if (hv_result_success(status))
return;
do_native:
- native_flush_tlb_others(cpus, info);
+ native_flush_tlb_multi(cpus, info);
}
static u64 hyperv_flush_tlb_others_ex(const struct cpumask *cpus,
@@ -239,6 +239,6 @@ void hyperv_setup_mmu_ops(void)
return;
pr_info("Using hypercall for remote TLB flush\n");
- pv_ops.mmu.flush_tlb_others = hyperv_flush_tlb_others;
+ pv_ops.mmu.flush_tlb_multi = hyperv_flush_tlb_multi;
pv_ops.mmu.tlb_remove_table = tlb_remove_table;
}
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index 43992e5c52c2..da3a1ac82be5 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -63,7 +63,7 @@ static inline void slow_down_io(void)
void native_flush_tlb_local(void);
void native_flush_tlb_global(void);
void native_flush_tlb_one_user(unsigned long addr);
-void native_flush_tlb_others(const struct cpumask *cpumask,
+void native_flush_tlb_multi(const struct cpumask *cpumask,
const struct flush_tlb_info *info);
static inline void __flush_tlb_local(void)
@@ -81,10 +81,10 @@ static inline void __flush_tlb_one_user(unsigned long addr)
PVOP_VCALL1(mmu.flush_tlb_one_user, addr);
}
-static inline void __flush_tlb_others(const struct cpumask *cpumask,
+static inline void __flush_tlb_multi(const struct cpumask *cpumask,
const struct flush_tlb_info *info)
{
- PVOP_VCALL2(mmu.flush_tlb_others, cpumask, info);
+ PVOP_VCALL2(mmu.flush_tlb_multi, cpumask, info);
}
static inline void paravirt_tlb_remove_table(struct mmu_gather *tlb, void *table)
diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
index ae692c3194e9..d9d6b0203ec4 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -161,8 +161,8 @@ struct pv_mmu_ops {
void (*flush_tlb_user)(void);
void (*flush_tlb_kernel)(void);
void (*flush_tlb_one_user)(unsigned long addr);
- void (*flush_tlb_others)(const struct cpumask *cpus,
- const struct flush_tlb_info *info);
+ void (*flush_tlb_multi)(const struct cpumask *cpus,
+ const struct flush_tlb_info *info);
void (*tlb_remove_table)(struct mmu_gather *tlb, void *table);
diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h
index 8c87a2e0b660..fa952eadbc2e 100644
--- a/arch/x86/include/asm/tlbflush.h
+++ b/arch/x86/include/asm/tlbflush.h
@@ -90,23 +90,6 @@ struct tlb_state {
u16 next_asid;
/*
- * We can be in one of several states:
- *
- * - Actively using an mm. Our CPU's bit will be set in
- * mm_cpumask(loaded_mm) and is_lazy == false;
- *
- * - Not using a real mm. loaded_mm == &init_mm. Our CPU's bit
- * will not be set in mm_cpumask(&init_mm) and is_lazy == false.
- *
- * - Lazily using a real mm. loaded_mm != &init_mm, our bit
- * is set in mm_cpumask(loaded_mm), but is_lazy == true.
- * We're heuristically guessing that the CR3 load we
- * skipped more than makes up for the overhead added by
- * lazy mode.
- */
- bool is_lazy;
-
- /*
* If set we changed the page tables in such a way that we
* needed an invalidation of all contexts (aka. PCIDs / ASIDs).
* This tells us to go invalidate all the non-loaded ctxs[]
@@ -151,7 +134,27 @@ struct tlb_state {
*/
struct tlb_context ctxs[TLB_NR_DYN_ASIDS];
};
-DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate);
+DECLARE_PER_CPU_ALIGNED(struct tlb_state, cpu_tlbstate);
+
+struct tlb_state_shared {
+ /*
+ * We can be in one of several states:
+ *
+ * - Actively using an mm. Our CPU's bit will be set in
+ * mm_cpumask(loaded_mm) and is_lazy == false;
+ *
+ * - Not using a real mm. loaded_mm == &init_mm. Our CPU's bit
+ * will not be set in mm_cpumask(&init_mm) and is_lazy == false.
+ *
+ * - Lazily using a real mm. loaded_mm != &init_mm, our bit
+ * is set in mm_cpumask(loaded_mm), but is_lazy == true.
+ * We're heuristically guessing that the CR3 load we
+ * skipped more than makes up for the overhead added by
+ * lazy mode.
+ */
+ bool is_lazy;
+};
+DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_state_shared, cpu_tlbstate_shared);
bool nmi_uaccess_okay(void);
#define nmi_uaccess_okay nmi_uaccess_okay
@@ -175,7 +178,7 @@ extern void initialize_tlbstate_and_flush(void);
* - flush_tlb_page(vma, vmaddr) flushes one page
* - flush_tlb_range(vma, start, end) flushes a range of pages
* - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
- * - flush_tlb_others(cpumask, info) flushes TLBs on other cpus
+ * - flush_tlb_multi(cpumask, info) flushes TLBs on multiple cpus
*
* ..but the i386 has somewhat limited tlb flushing capabilities,
* and page-granular flushes are available only on i486 and up.
@@ -201,14 +204,15 @@ struct flush_tlb_info {
unsigned long start;
unsigned long end;
u64 new_tlb_gen;
- unsigned int stride_shift;
- bool freed_tables;
+ unsigned int initiating_cpu;
+ u8 stride_shift;
+ u8 freed_tables;
};
void flush_tlb_local(void);
void flush_tlb_one_user(unsigned long addr);
void flush_tlb_one_kernel(unsigned long addr);
-void flush_tlb_others(const struct cpumask *cpumask,
+void flush_tlb_multi(const struct cpumask *cpumask,
const struct flush_tlb_info *info);
#ifdef CONFIG_PARAVIRT
diff --git a/arch/x86/include/asm/trace/hyperv.h b/arch/x86/include/asm/trace/hyperv.h
index 4d705cb4d63b..a8e5a7a2b460 100644
--- a/arch/x86/include/asm/trace/hyperv.h
+++ b/arch/x86/include/asm/trace/hyperv.h
@@ -8,7 +8,7 @@
#if IS_ENABLED(CONFIG_HYPERV)
-TRACE_EVENT(hyperv_mmu_flush_tlb_others,
+TRACE_EVENT(hyperv_mmu_flush_tlb_multi,
TP_PROTO(const struct cpumask *cpus,
const struct flush_tlb_info *info),
TP_ARGS(cpus, info),
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 84ec0ba491e4..6974b5174495 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -706,7 +706,7 @@ static inline temp_mm_state_t use_temporary_mm(struct mm_struct *mm)
* with a stale address space WITHOUT being in lazy mode after
* restoring the previous mm.
*/
- if (this_cpu_read(cpu_tlbstate.is_lazy))
+ if (this_cpu_read(cpu_tlbstate_shared.is_lazy))
leave_mm(smp_processor_id());
temp_state.mm = this_cpu_read(cpu_tlbstate.loaded_mm);
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index 172c947240b9..5d32fa477a62 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -613,7 +613,7 @@ static int kvm_cpu_down_prepare(unsigned int cpu)
}
#endif
-static void kvm_flush_tlb_others(const struct cpumask *cpumask,
+static void kvm_flush_tlb_multi(const struct cpumask *cpumask,
const struct flush_tlb_info *info)
{
u8 state;
@@ -627,6 +627,11 @@ static void kvm_flush_tlb_others(const struct cpumask *cpumask,
* queue flush_on_enter for pre-empted vCPUs
*/
for_each_cpu(cpu, flushmask) {
+ /*
+ * The local vCPU is never preempted, so we do not explicitly
+ * skip check for local vCPU - it will never be cleared from
+ * flushmask.
+ */
src = &per_cpu(steal_time, cpu);
state = READ_ONCE(src->preempted);
if ((state & KVM_VCPU_PREEMPTED)) {
@@ -636,7 +641,7 @@ static void kvm_flush_tlb_others(const struct cpumask *cpumask,
}
}
- native_flush_tlb_others(flushmask, info);
+ native_flush_tlb_multi(flushmask, info);
}
static void __init kvm_guest_init(void)
@@ -654,7 +659,7 @@ static void __init kvm_guest_init(void)
}
if (pv_tlb_flush_supported()) {
- pv_ops.mmu.flush_tlb_others = kvm_flush_tlb_others;
+ pv_ops.mmu.flush_tlb_multi = kvm_flush_tlb_multi;
pv_ops.mmu.tlb_remove_table = tlb_remove_table;
pr_info("KVM setup pv remote TLB flush\n");
}
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index d0730264786b..04cafc057bed 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -291,7 +291,7 @@ struct paravirt_patch_template pv_ops = {
.mmu.flush_tlb_user = native_flush_tlb_local,
.mmu.flush_tlb_kernel = native_flush_tlb_global,
.mmu.flush_tlb_one_user = native_flush_tlb_one_user,
- .mmu.flush_tlb_others = native_flush_tlb_others,
+ .mmu.flush_tlb_multi = native_flush_tlb_multi,
.mmu.tlb_remove_table =
(void (*)(struct mmu_gather *, void *))tlb_remove_page,
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index fbf41dd142ca..75ef19aa8903 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -1017,7 +1017,7 @@ void __init zone_sizes_init(void)
free_area_init(max_zone_pfns);
}
-__visible DEFINE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate) = {
+__visible DEFINE_PER_CPU_ALIGNED(struct tlb_state, cpu_tlbstate) = {
.loaded_mm = &init_mm,
.next_asid = 1,
.cr4 = ~0UL, /* fail hard if we screw up cr4 shadow initialization */
diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index 98f269560d40..78804680e923 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -24,7 +24,7 @@
# define __flush_tlb_local native_flush_tlb_local
# define __flush_tlb_global native_flush_tlb_global
# define __flush_tlb_one_user(addr) native_flush_tlb_one_user(addr)
-# define __flush_tlb_others(msk, info) native_flush_tlb_others(msk, info)
+# define __flush_tlb_multi(msk, info) native_flush_tlb_multi(msk, info)
#endif
/*
@@ -300,7 +300,7 @@ void leave_mm(int cpu)
return;
/* Warn if we're not lazy. */
- WARN_ON(!this_cpu_read(cpu_tlbstate.is_lazy));
+ WARN_ON(!this_cpu_read(cpu_tlbstate_shared.is_lazy));
switch_mm(NULL, &init_mm, NULL);
}
@@ -316,7 +316,7 @@ void switch_mm(struct mm_struct *prev, struct mm_struct *next,
local_irq_restore(flags);
}
-static inline unsigned long mm_mangle_tif_spec_ib(struct task_struct *next)
+static unsigned long mm_mangle_tif_spec_ib(struct task_struct *next)
{
unsigned long next_tif = task_thread_info(next)->flags;
unsigned long ibpb = (next_tif >> TIF_SPEC_IB) & LAST_USER_MM_IBPB;
@@ -424,7 +424,7 @@ void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
{
struct mm_struct *real_prev = this_cpu_read(cpu_tlbstate.loaded_mm);
u16 prev_asid = this_cpu_read(cpu_tlbstate.loaded_mm_asid);
- bool was_lazy = this_cpu_read(cpu_tlbstate.is_lazy);
+ bool was_lazy = this_cpu_read(cpu_tlbstate_shared.is_lazy);
unsigned cpu = smp_processor_id();
u64 next_tlb_gen;
bool need_flush;
@@ -439,7 +439,7 @@ void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
* NB: leave_mm() calls us with prev == NULL and tsk == NULL.
*/
- /* We don't want flush_tlb_func_* to run concurrently with us. */
+ /* We don't want flush_tlb_func() to run concurrently with us. */
if (IS_ENABLED(CONFIG_PROVE_LOCKING))
WARN_ON_ONCE(!irqs_disabled());
@@ -469,7 +469,8 @@ void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
__flush_tlb_all();
}
#endif
- this_cpu_write(cpu_tlbstate.is_lazy, false);
+ if (was_lazy)
+ this_cpu_write(cpu_tlbstate_shared.is_lazy, false);
/*
* The membarrier system call requires a full memory barrier and
@@ -490,7 +491,7 @@ void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
/*
* Even in lazy TLB mode, the CPU should stay set in the
* mm_cpumask. The TLB shootdown code can figure out from
- * from cpu_tlbstate.is_lazy whether or not to send an IPI.
+ * cpu_tlbstate_shared.is_lazy whether or not to send an IPI.
*/
if (WARN_ON_ONCE(real_prev != &init_mm &&
!cpumask_test_cpu(cpu, mm_cpumask(next))))
@@ -598,7 +599,7 @@ void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
if (this_cpu_read(cpu_tlbstate.loaded_mm) == &init_mm)
return;
- this_cpu_write(cpu_tlbstate.is_lazy, true);
+ this_cpu_write(cpu_tlbstate_shared.is_lazy, true);
}
/*
@@ -647,14 +648,13 @@ void initialize_tlbstate_and_flush(void)
}
/*
- * flush_tlb_func_common()'s memory ordering requirement is that any
+ * flush_tlb_func()'s memory ordering requirement is that any
* TLB fills that happen after we flush the TLB are ordered after we
* read active_mm's tlb_gen. We don't need any explicit barriers
* because all x86 flush operations are serializing and the
* atomic64_read operation won't be reordered by the compiler.
*/
-static void flush_tlb_func_common(const struct flush_tlb_info *f,
- bool local, enum tlb_flush_reason reason)
+static void flush_tlb_func(void *info)
{
/*
* We have three different tlb_gen values in here. They are:
@@ -665,28 +665,40 @@ static void flush_tlb_func_common(const struct flush_tlb_info *f,
* - f->new_tlb_gen: the generation that the requester of the flush
* wants us to catch up to.
*/
+ const struct flush_tlb_info *f = info;
struct mm_struct *loaded_mm = this_cpu_read(cpu_tlbstate.loaded_mm);
u32 loaded_mm_asid = this_cpu_read(cpu_tlbstate.loaded_mm_asid);
u64 mm_tlb_gen = atomic64_read(&loaded_mm->context.tlb_gen);
u64 local_tlb_gen = this_cpu_read(cpu_tlbstate.ctxs[loaded_mm_asid].tlb_gen);
+ bool local = smp_processor_id() == f->initiating_cpu;
+ unsigned long nr_invalidate = 0;
/* This code cannot presently handle being reentered. */
VM_WARN_ON(!irqs_disabled());
+ if (!local) {
+ inc_irq_stat(irq_tlb_count);
+ count_vm_tlb_event(NR_TLB_REMOTE_FLUSH_RECEIVED);
+
+ /* Can only happen on remote CPUs */
+ if (f->mm && f->mm != loaded_mm)
+ return;
+ }
+
if (unlikely(loaded_mm == &init_mm))
return;
VM_WARN_ON(this_cpu_read(cpu_tlbstate.ctxs[loaded_mm_asid].ctx_id) !=
loaded_mm->context.ctx_id);
- if (this_cpu_read(cpu_tlbstate.is_lazy)) {
+ if (this_cpu_read(cpu_tlbstate_shared.is_lazy)) {
/*
* We're in lazy mode. We need to at least flush our
* paging-structure cache to avoid speculatively reading
* garbage into our TLB. Since switching to init_mm is barely
* slower than a minimal flush, just switch to init_mm.
*
- * This should be rare, with native_flush_tlb_others skipping
+ * This should be rare, with native_flush_tlb_multi() skipping
* IPIs to lazy TLB mode CPUs.
*/
switch_mm_irqs_off(NULL, &init_mm, NULL);
@@ -700,8 +712,7 @@ static void flush_tlb_func_common(const struct flush_tlb_info *f,
* be handled can catch us all the way up, leaving no work for
* the second flush.
*/
- trace_tlb_flush(reason, 0);
- return;
+ goto done;
}
WARN_ON_ONCE(local_tlb_gen > mm_tlb_gen);
@@ -748,56 +759,54 @@ static void flush_tlb_func_common(const struct flush_tlb_info *f,
f->new_tlb_gen == local_tlb_gen + 1 &&
f->new_tlb_gen == mm_tlb_gen) {
/* Partial flush */
- unsigned long nr_invalidate = (f->end - f->start) >> f->stride_shift;
unsigned long addr = f->start;
+ nr_invalidate = (f->end - f->start) >> f->stride_shift;
+
while (addr < f->end) {
flush_tlb_one_user(addr);
addr += 1UL << f->stride_shift;
}
if (local)
count_vm_tlb_events(NR_TLB_LOCAL_FLUSH_ONE, nr_invalidate);
- trace_tlb_flush(reason, nr_invalidate);
} else {
/* Full flush. */
+ nr_invalidate = TLB_FLUSH_ALL;
+
flush_tlb_local();
if (local)
count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
- trace_tlb_flush(reason, TLB_FLUSH_ALL);
}
/* Both paths above update our state to mm_tlb_gen. */
this_cpu_write(cpu_tlbstate.ctxs[loaded_mm_asid].tlb_gen, mm_tlb_gen);
-}
-
-static void flush_tlb_func_local(const void *info, enum tlb_flush_reason reason)
-{
- const struct flush_tlb_info *f = info;
- flush_tlb_func_common(f, true, reason);
+ /* Tracing is done in a unified manner to reduce the code size */
+done:
+ trace_tlb_flush(!local ? TLB_REMOTE_SHOOTDOWN :
+ (f->mm == NULL) ? TLB_LOCAL_SHOOTDOWN :
+ TLB_LOCAL_MM_SHOOTDOWN,
+ nr_invalidate);
}
-static void flush_tlb_func_remote(void *info)
+static bool tlb_is_not_lazy(int cpu)
{
- const struct flush_tlb_info *f = info;
-
- inc_irq_stat(irq_tlb_count);
-
- if (f->mm && f->mm != this_cpu_read(cpu_tlbstate.loaded_mm))
- return;
-
- count_vm_tlb_event(NR_TLB_REMOTE_FLUSH_RECEIVED);
- flush_tlb_func_common(f, false, TLB_REMOTE_SHOOTDOWN);
+ return !per_cpu(cpu_tlbstate_shared.is_lazy, cpu);
}
-static bool tlb_is_not_lazy(int cpu, void *data)
-{
- return !per_cpu(cpu_tlbstate.is_lazy, cpu);
-}
+static DEFINE_PER_CPU(cpumask_t, flush_tlb_mask);
+
+DEFINE_PER_CPU_SHARED_ALIGNED(struct tlb_state_shared, cpu_tlbstate_shared);
+EXPORT_PER_CPU_SYMBOL(cpu_tlbstate_shared);
-STATIC_NOPV void native_flush_tlb_others(const struct cpumask *cpumask,
+STATIC_NOPV void native_flush_tlb_multi(const struct cpumask *cpumask,
const struct flush_tlb_info *info)
{
+ /*
+ * Do accounting and tracing. Note that there are (and have always been)
+ * cases in which a remote TLB flush will be traced, but eventually
+ * would not happen.
+ */
count_vm_tlb_event(NR_TLB_REMOTE_FLUSH);
if (info->end == TLB_FLUSH_ALL)
trace_tlb_flush(TLB_REMOTE_SEND_IPI, TLB_FLUSH_ALL);
@@ -815,18 +824,42 @@ STATIC_NOPV void native_flush_tlb_others(const struct cpumask *cpumask,
* up on the new contents of what used to be page tables, while
* doing a speculative memory access.
*/
- if (info->freed_tables)
- smp_call_function_many(cpumask, flush_tlb_func_remote,
- (void *)info, 1);
- else
- on_each_cpu_cond_mask(tlb_is_not_lazy, flush_tlb_func_remote,
- (void *)info, 1, cpumask);
+ if (info->freed_tables) {
+ on_each_cpu_mask(cpumask, flush_tlb_func, (void *)info, true);
+ } else {
+ /*
+ * Although we could have used on_each_cpu_cond_mask(),
+ * open-coding it has performance advantages, as it eliminates
+ * the need for indirect calls or retpolines. In addition, it
+ * allows to use a designated cpumask for evaluating the
+ * condition, instead of allocating one.
+ *
+ * This code works under the assumption that there are no nested
+ * TLB flushes, an assumption that is already made in
+ * flush_tlb_mm_range().
+ *
+ * cond_cpumask is logically a stack-local variable, but it is
+ * more efficient to have it off the stack and not to allocate
+ * it on demand. Preemption is disabled and this code is
+ * non-reentrant.
+ */
+ struct cpumask *cond_cpumask = this_cpu_ptr(&flush_tlb_mask);
+ int cpu;
+
+ cpumask_clear(cond_cpumask);
+
+ for_each_cpu(cpu, cpumask) {
+ if (tlb_is_not_lazy(cpu))
+ __cpumask_set_cpu(cpu, cond_cpumask);
+ }
+ on_each_cpu_mask(cond_cpumask, flush_tlb_func, (void *)info, true);
+ }
}
-void flush_tlb_others(const struct cpumask *cpumask,
+void flush_tlb_multi(const struct cpumask *cpumask,
const struct flush_tlb_info *info)
{
- __flush_tlb_others(cpumask, info);
+ __flush_tlb_multi(cpumask, info);
}
/*
@@ -847,7 +880,7 @@ static DEFINE_PER_CPU_SHARED_ALIGNED(struct flush_tlb_info, flush_tlb_info);
static DEFINE_PER_CPU(unsigned int, flush_tlb_info_idx);
#endif
-static inline struct flush_tlb_info *get_flush_tlb_info(struct mm_struct *mm,
+static struct flush_tlb_info *get_flush_tlb_info(struct mm_struct *mm,
unsigned long start, unsigned long end,
unsigned int stride_shift, bool freed_tables,
u64 new_tlb_gen)
@@ -869,11 +902,12 @@ static inline struct flush_tlb_info *get_flush_tlb_info(struct mm_struct *mm,
info->stride_shift = stride_shift;
info->freed_tables = freed_tables;
info->new_tlb_gen = new_tlb_gen;
+ info->initiating_cpu = smp_processor_id();
return info;
}
-static inline void put_flush_tlb_info(void)
+static void put_flush_tlb_info(void)
{
#ifdef CONFIG_DEBUG_VM
/* Complete reentrancy prevention checks */
@@ -905,16 +939,20 @@ void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
info = get_flush_tlb_info(mm, start, end, stride_shift, freed_tables,
new_tlb_gen);
- if (mm == this_cpu_read(cpu_tlbstate.loaded_mm)) {
+ /*
+ * flush_tlb_multi() is not optimized for the common case in which only
+ * a local TLB flush is needed. Optimize this use-case by calling
+ * flush_tlb_func_local() directly in this case.
+ */
+ if (cpumask_any_but(mm_cpumask(mm), cpu) < nr_cpu_ids) {
+ flush_tlb_multi(mm_cpumask(mm), info);
+ } else if (mm == this_cpu_read(cpu_tlbstate.loaded_mm)) {
lockdep_assert_irqs_enabled();
local_irq_disable();
- flush_tlb_func_local(info, TLB_LOCAL_MM_SHOOTDOWN);
+ flush_tlb_func(info);
local_irq_enable();
}
- if (cpumask_any_but(mm_cpumask(mm), cpu) < nr_cpu_ids)
- flush_tlb_others(mm_cpumask(mm), info);
-
put_flush_tlb_info();
put_cpu();
}
@@ -1119,34 +1157,30 @@ void __flush_tlb_all(void)
}
EXPORT_SYMBOL_GPL(__flush_tlb_all);
-/*
- * arch_tlbbatch_flush() performs a full TLB flush regardless of the active mm.
- * This means that the 'struct flush_tlb_info' that describes which mappings to
- * flush is actually fixed. We therefore set a single fixed struct and use it in
- * arch_tlbbatch_flush().
- */
-static const struct flush_tlb_info full_flush_tlb_info = {
- .mm = NULL,
- .start = 0,
- .end = TLB_FLUSH_ALL,
-};
-
void arch_tlbbatch_flush(struct arch_tlbflush_unmap_batch *batch)
{
+ struct flush_tlb_info *info;
+
int cpu = get_cpu();
- if (cpumask_test_cpu(cpu, &batch->cpumask)) {
+ info = get_flush_tlb_info(NULL, 0, TLB_FLUSH_ALL, 0, false, 0);
+ /*
+ * flush_tlb_multi() is not optimized for the common case in which only
+ * a local TLB flush is needed. Optimize this use-case by calling
+ * flush_tlb_func_local() directly in this case.
+ */
+ if (cpumask_any_but(&batch->cpumask, cpu) < nr_cpu_ids) {
+ flush_tlb_multi(&batch->cpumask, info);
+ } else if (cpumask_test_cpu(cpu, &batch->cpumask)) {
lockdep_assert_irqs_enabled();
local_irq_disable();
- flush_tlb_func_local(&full_flush_tlb_info, TLB_LOCAL_SHOOTDOWN);
+ flush_tlb_func(info);
local_irq_enable();
}
- if (cpumask_any_but(&batch->cpumask, cpu) < nr_cpu_ids)
- flush_tlb_others(&batch->cpumask, &full_flush_tlb_info);
-
cpumask_clear(&batch->cpumask);
+ put_flush_tlb_info();
put_cpu();
}
diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c
index 1e28c880f642..ade789e73ee4 100644
--- a/arch/x86/xen/mmu_pv.c
+++ b/arch/x86/xen/mmu_pv.c
@@ -1247,8 +1247,8 @@ static void xen_flush_tlb_one_user(unsigned long addr)
preempt_enable();
}
-static void xen_flush_tlb_others(const struct cpumask *cpus,
- const struct flush_tlb_info *info)
+static void xen_flush_tlb_multi(const struct cpumask *cpus,
+ const struct flush_tlb_info *info)
{
struct {
struct mmuext_op op;
@@ -1258,7 +1258,7 @@ static void xen_flush_tlb_others(const struct cpumask *cpus,
const size_t mc_entry_size = sizeof(args->op) +
sizeof(args->mask[0]) * BITS_TO_LONGS(num_possible_cpus());
- trace_xen_mmu_flush_tlb_others(cpus, info->mm, info->start, info->end);
+ trace_xen_mmu_flush_tlb_multi(cpus, info->mm, info->start, info->end);
if (cpumask_empty(cpus))
return; /* nothing to do */
@@ -1267,9 +1267,8 @@ static void xen_flush_tlb_others(const struct cpumask *cpus,
args = mcs.args;
args->op.arg2.vcpumask = to_cpumask(args->mask);
- /* Remove us, and any offline CPUS. */
+ /* Remove any offline CPUs */
cpumask_and(to_cpumask(args->mask), cpus, cpu_online_mask);
- cpumask_clear_cpu(smp_processor_id(), to_cpumask(args->mask));
args->op.cmd = MMUEXT_TLB_FLUSH_MULTI;
if (info->end != TLB_FLUSH_ALL &&
@@ -2086,7 +2085,7 @@ static const struct pv_mmu_ops xen_mmu_ops __initconst = {
.flush_tlb_user = xen_flush_tlb,
.flush_tlb_kernel = xen_flush_tlb,
.flush_tlb_one_user = xen_flush_tlb_one_user,
- .flush_tlb_others = xen_flush_tlb_others,
+ .flush_tlb_multi = xen_flush_tlb_multi,
.tlb_remove_table = tlb_remove_table,
.pgd_alloc = xen_pgd_alloc,
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-24 09:30:34 +0000