@@ -39,7 +39,6 @@ obj-$(CONFIG_MEM_ACCESS) += mem_access.o
obj-y += mm.o
obj-y += monitor.o
obj-y += p2m.o
-obj-y += percpu.o
obj-y += platform.o
obj-y += platform_hypercall.o
obj-y += physdev.o
@@ -2,6 +2,7 @@
#define __ASM_SMP_H
#ifndef __ASSEMBLY__
+#include <xen/percpu.h>
#include <xen/cpumask.h>
#include <asm/current.h>
#endif
@@ -12,12 +13,6 @@ extern unsigned long smp_up_cpu;
DECLARE_PER_CPU(cpumask_var_t, cpu_sibling_mask);
DECLARE_PER_CPU(cpumask_var_t, cpu_core_mask);
-/*
- * Do we, for platform reasons, need to actually keep CPUs online when we
- * would otherwise prefer them to be off?
- */
-#define park_offline_cpus false
-
extern void noreturn stop_cpu(void);
extern int arch_smp_init(void);
deleted file mode 100644
@@ -1,85 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#include <xen/percpu.h>
-#include <xen/cpu.h>
-#include <xen/init.h>
-#include <xen/mm.h>
-#include <xen/rcupdate.h>
-
-unsigned long __per_cpu_offset[NR_CPUS];
-#define INVALID_PERCPU_AREA (-(long)__per_cpu_start)
-#define PERCPU_ORDER (get_order_from_bytes(__per_cpu_data_end-__per_cpu_start))
-
-void __init percpu_init_areas(void)
-{
- unsigned int cpu;
- for ( cpu = 1; cpu < NR_CPUS; cpu++ )
- __per_cpu_offset[cpu] = INVALID_PERCPU_AREA;
-}
-
-static int init_percpu_area(unsigned int cpu)
-{
- char *p;
- if ( __per_cpu_offset[cpu] != INVALID_PERCPU_AREA )
- return -EBUSY;
- if ( (p = alloc_xenheap_pages(PERCPU_ORDER, 0)) == NULL )
- return -ENOMEM;
- memset(p, 0, __per_cpu_data_end - __per_cpu_start);
- __per_cpu_offset[cpu] = p - __per_cpu_start;
- return 0;
-}
-
-struct free_info {
- unsigned int cpu;
- struct rcu_head rcu;
-};
-static DEFINE_PER_CPU(struct free_info, free_info);
-
-static void _free_percpu_area(struct rcu_head *head)
-{
- struct free_info *info = container_of(head, struct free_info, rcu);
- unsigned int cpu = info->cpu;
- char *p = __per_cpu_start + __per_cpu_offset[cpu];
- free_xenheap_pages(p, PERCPU_ORDER);
- __per_cpu_offset[cpu] = INVALID_PERCPU_AREA;
-}
-
-static void free_percpu_area(unsigned int cpu)
-{
- struct free_info *info = &per_cpu(free_info, cpu);
- info->cpu = cpu;
- call_rcu(&info->rcu, _free_percpu_area);
-}
-
-static int cpu_percpu_callback(
- struct notifier_block *nfb, unsigned long action, void *hcpu)
-{
- unsigned int cpu = (unsigned long)hcpu;
- int rc = 0;
-
- switch ( action )
- {
- case CPU_UP_PREPARE:
- rc = init_percpu_area(cpu);
- break;
- case CPU_UP_CANCELED:
- case CPU_DEAD:
- free_percpu_area(cpu);
- break;
- default:
- break;
- }
-
- return notifier_from_errno(rc);
-}
-
-static struct notifier_block cpu_percpu_nfb = {
- .notifier_call = cpu_percpu_callback,
- .priority = 100 /* highest priority */
-};
-
-static int __init percpu_presmp_init(void)
-{
- register_cpu_notifier(&cpu_percpu_nfb);
- return 0;
-}
-presmp_initcall(percpu_presmp_init);
@@ -7,10 +7,4 @@
DECLARE_PER_CPU(cpumask_var_t, cpu_sibling_mask);
DECLARE_PER_CPU(cpumask_var_t, cpu_core_mask);
-/*
- * Do we, for platform reasons, need to actually keep CPUs online when we
- * would otherwise prefer them to be off?
- */
-#define park_offline_cpus false
-
#endif
@@ -141,7 +141,6 @@ void smp_send_state_dump(unsigned int cpu)
/* domain.c */
DEFINE_PER_CPU(struct vcpu *, curr_vcpu);
-unsigned long __per_cpu_offset[NR_CPUS];
void context_switch(struct vcpu *prev, struct vcpu *next)
{
@@ -10,12 +10,6 @@
DECLARE_PER_CPU(cpumask_var_t, cpu_sibling_mask);
DECLARE_PER_CPU(cpumask_var_t, cpu_core_mask);
-/*
- * Do we, for platform reasons, need to actually keep CPUs online when we
- * would otherwise prefer them to be off?
- */
-#define park_offline_cpus false
-
/*
* Mapping between Xen logical cpu index and hartid.
*/
@@ -133,7 +133,6 @@ void smp_send_state_dump(unsigned int cpu)
/* domain.c */
DEFINE_PER_CPU(struct vcpu *, curr_vcpu);
-unsigned long __per_cpu_offset[NR_CPUS];
void context_switch(struct vcpu *prev, struct vcpu *next)
{
@@ -54,7 +54,6 @@ obj-y += mpparse.o
obj-y += nmi.o
obj-y += numa.o
obj-y += pci.o
-obj-y += percpu.o
obj-y += physdev.o
obj-$(CONFIG_COMPAT) += x86_64/physdev.o
obj-$(CONFIG_X86_PSR) += psr.o
@@ -1,3 +1,2 @@
# SPDX-License-Identifier: GPL-2.0-only
generic-y += div64.h
-generic-y += percpu.h
new file mode 100644
@@ -0,0 +1,14 @@
+#ifndef __X86_PERCPU_H__
+#define __X86_PERCPU_H__
+
+#define PARK_OFFLINE_CPUS_VAR
+
+/*
+ * Force uses of per_cpu() with an invalid area to attempt to access the
+ * middle of the non-canonical address space resulting in a #GP, rather than a
+ * possible #PF at (NULL + a little) which has security implications in the
+ * context of PV guests.
+ */
+#define INVALID_PERCPU_AREA (0x8000000000000000UL - (unsigned long)__per_cpu_start)
+
+#endif /* __X86_PERCPU_H__ */
deleted file mode 100644
@@ -1,112 +0,0 @@
-#include <xen/percpu.h>
-#include <xen/cpu.h>
-#include <xen/init.h>
-#include <xen/mm.h>
-#include <xen/rcupdate.h>
-
-unsigned long __per_cpu_offset[NR_CPUS];
-
-/*
- * Force uses of per_cpu() with an invalid area to attempt to access the
- * middle of the non-canonical address space resulting in a #GP, rather than a
- * possible #PF at (NULL + a little) which has security implications in the
- * context of PV guests.
- */
-#define INVALID_PERCPU_AREA (0x8000000000000000UL - (unsigned long)__per_cpu_start)
-#define PERCPU_ORDER get_order_from_bytes(__per_cpu_data_end - __per_cpu_start)
-
-void __init percpu_init_areas(void)
-{
- unsigned int cpu;
-
- for ( cpu = 1; cpu < NR_CPUS; cpu++ )
- __per_cpu_offset[cpu] = INVALID_PERCPU_AREA;
-}
-
-static int init_percpu_area(unsigned int cpu)
-{
- char *p;
-
- if ( __per_cpu_offset[cpu] != INVALID_PERCPU_AREA )
- return 0;
-
- if ( (p = alloc_xenheap_pages(PERCPU_ORDER, 0)) == NULL )
- return -ENOMEM;
-
- memset(p, 0, __per_cpu_data_end - __per_cpu_start);
- __per_cpu_offset[cpu] = p - __per_cpu_start;
-
- return 0;
-}
-
-struct free_info {
- unsigned int cpu;
- struct rcu_head rcu;
-};
-static DEFINE_PER_CPU(struct free_info, free_info);
-
-static void cf_check _free_percpu_area(struct rcu_head *head)
-{
- struct free_info *info = container_of(head, struct free_info, rcu);
- unsigned int cpu = info->cpu;
- char *p = __per_cpu_start + __per_cpu_offset[cpu];
-
- free_xenheap_pages(p, PERCPU_ORDER);
- __per_cpu_offset[cpu] = INVALID_PERCPU_AREA;
-}
-
-static void free_percpu_area(unsigned int cpu)
-{
- struct free_info *info = &per_cpu(free_info, cpu);
-
- info->cpu = cpu;
- call_rcu(&info->rcu, _free_percpu_area);
-}
-
-static int cf_check cpu_percpu_callback(
- struct notifier_block *nfb, unsigned long action, void *hcpu)
-{
- unsigned int cpu = (unsigned long)hcpu;
- int rc = 0;
-
- switch ( action )
- {
- case CPU_UP_PREPARE:
- rc = init_percpu_area(cpu);
- break;
- case CPU_UP_CANCELED:
- case CPU_DEAD:
- case CPU_RESUME_FAILED:
- if ( !park_offline_cpus && system_state != SYS_STATE_suspend )
- free_percpu_area(cpu);
- break;
- case CPU_REMOVE:
- if ( park_offline_cpus )
- free_percpu_area(cpu);
- break;
- }
-
- return notifier_from_errno(rc);
-}
-
-static struct notifier_block cpu_percpu_nfb = {
- .notifier_call = cpu_percpu_callback,
- .priority = 100 /* highest priority */
-};
-
-static int __init cf_check percpu_presmp_init(void)
-{
- register_cpu_notifier(&cpu_percpu_nfb);
-
- return 0;
-}
-presmp_initcall(percpu_presmp_init);
-
-/*
- * Local variables:
- * mode: C
- * c-file-style: "BSD"
- * c-basic-offset: 4
- * indent-tabs-mode: nil
- * End:
- */
@@ -31,6 +31,7 @@ obj-y += notifier.o
obj-$(CONFIG_NUMA) += numa.o
obj-y += page_alloc.o
obj-y += pdx.o
+obj-y += percpu.o
obj-$(CONFIG_PERF_COUNTERS) += perfc.o
obj-bin-$(CONFIG_HAS_PMAP) += pmap.init.o
obj-y += preempt.o
new file mode 100644
@@ -0,0 +1,116 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#include <xen/percpu.h>
+#include <xen/cpu.h>
+#include <xen/init.h>
+#include <xen/mm.h>
+#include <xen/rcupdate.h>
+#include <xen/sections.h>
+
+#ifndef INVALID_PERCPU_AREA
+#define INVALID_PERCPU_AREA (-(long)__per_cpu_start)
+#endif
+
+#define PERCPU_ORDER get_order_from_bytes(__per_cpu_data_end - __per_cpu_start)
+
+extern char __per_cpu_start[];
+extern const char __per_cpu_data_end[];
+
+unsigned long __read_mostly __per_cpu_offset[NR_CPUS];
+
+void __init percpu_init_areas(void)
+{
+ unsigned int cpu;
+
+ for ( cpu = 1; cpu < NR_CPUS; cpu++ )
+ __per_cpu_offset[cpu] = INVALID_PERCPU_AREA;
+}
+
+static int init_percpu_area(unsigned int cpu)
+{
+ char *p;
+
+ if ( __per_cpu_offset[cpu] != INVALID_PERCPU_AREA )
+ return park_offline_cpus ? 0 : -EBUSY;
+
+ if ( (p = alloc_xenheap_pages(PERCPU_ORDER, 0)) == NULL )
+ return -ENOMEM;
+
+ memset(p, 0, __per_cpu_data_end - __per_cpu_start);
+ __per_cpu_offset[cpu] = p - __per_cpu_start;
+
+ return 0;
+}
+
+struct free_info {
+ unsigned int cpu;
+ struct rcu_head rcu;
+};
+static DEFINE_PER_CPU(struct free_info, free_info);
+
+static void cf_check _free_percpu_area(struct rcu_head *head)
+{
+ struct free_info *info = container_of(head, struct free_info, rcu);
+ unsigned int cpu = info->cpu;
+ char *p = __per_cpu_start + __per_cpu_offset[cpu];
+
+ free_xenheap_pages(p, PERCPU_ORDER);
+ __per_cpu_offset[cpu] = INVALID_PERCPU_AREA;
+}
+
+static void free_percpu_area(unsigned int cpu)
+{
+ struct free_info *info = &per_cpu(free_info, cpu);
+
+ info->cpu = cpu;
+ call_rcu(&info->rcu, _free_percpu_area);
+}
+
+static int cf_check cpu_percpu_callback(
+ struct notifier_block *nfb, unsigned long action, void *hcpu)
+{
+ unsigned int cpu = (unsigned long)hcpu;
+ int rc = 0;
+
+ switch ( action )
+ {
+ case CPU_UP_PREPARE:
+ rc = init_percpu_area(cpu);
+ break;
+ case CPU_UP_CANCELED:
+ case CPU_DEAD:
+ case CPU_RESUME_FAILED:
+ if ( !park_offline_cpus && system_state != SYS_STATE_suspend )
+ free_percpu_area(cpu);
+ break;
+ case CPU_REMOVE:
+ if ( park_offline_cpus )
+ free_percpu_area(cpu);
+ break;
+ default:
+ break;
+ }
+
+ return notifier_from_errno(rc);
+}
+
+static struct notifier_block cpu_percpu_nfb = {
+ .notifier_call = cpu_percpu_callback,
+ .priority = 100 /* highest priority */
+};
+
+static int __init cf_check percpu_presmp_init(void)
+{
+ register_cpu_notifier(&cpu_percpu_nfb);
+
+ return 0;
+}
+presmp_initcall(percpu_presmp_init);
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
@@ -2,29 +2,6 @@
#ifndef __ASM_GENERIC_PERCPU_H__
#define __ASM_GENERIC_PERCPU_H__
-#ifndef __ASSEMBLY__
-
-#include <xen/types.h>
-#include <asm/current.h>
-
-extern char __per_cpu_start[];
-extern const char __per_cpu_data_end[];
-extern unsigned long __per_cpu_offset[NR_CPUS];
-void percpu_init_areas(void);
-
-#define per_cpu(var, cpu) \
- (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]))
-
-#define this_cpu(var) \
- (*RELOC_HIDE(&per_cpu__##var, get_per_cpu_offset()))
-
-#define per_cpu_ptr(var, cpu) \
- (*RELOC_HIDE(var, __per_cpu_offset[cpu]))
-#define this_cpu_ptr(var) \
- (*RELOC_HIDE(var, get_per_cpu_offset()))
-
-#endif
-
#endif /* __ASM_GENERIC_PERCPU_H__ */
/*
@@ -29,6 +29,36 @@
#include <asm/percpu.h>
+#ifndef __ASSEMBLY__
+
+#include <xen/types.h>
+#include <asm/current.h>
+
+#ifndef PARK_OFFLINE_CPUS_VAR
+/*
+ * Do we, for platform reasons, need to actually keep CPUs online when we
+ * would otherwise prefer them to be off?
+ */
+#define park_offline_cpus false
+#endif
+
+extern unsigned long __per_cpu_offset[];
+
+#define per_cpu(var, cpu) \
+ (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]))
+
+#define this_cpu(var) \
+ (*RELOC_HIDE(&per_cpu__##var, get_per_cpu_offset()))
+
+#define per_cpu_ptr(var, cpu) \
+ (*RELOC_HIDE(var, __per_cpu_offset[cpu]))
+#define this_cpu_ptr(var) \
+ (*RELOC_HIDE(var, get_per_cpu_offset()))
+
+void percpu_init_areas(void);
+
+#endif /* __ASSEMBLY__ */
+
/* Linux compatibility. */
#define get_cpu_var(var) this_cpu(var)
#define put_cpu_var(var)