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-rw-r--r--arch/s390/Kconfig15
-rw-r--r--arch/s390/defconfig1
-rw-r--r--arch/s390/include/asm/mmu_context.h4
-rw-r--r--arch/s390/include/asm/pgalloc.h3
-rw-r--r--arch/s390/include/asm/setup.h17
-rw-r--r--arch/s390/kernel/setup.c36
-rw-r--r--arch/s390/kernel/vdso.c9
-rw-r--r--arch/s390/kvm/Kconfig1
-rw-r--r--arch/s390/lib/uaccess_mvcos.c4
-rw-r--r--arch/s390/mm/fault.c4
-rw-r--r--arch/s390/mm/pgtable.c2
11 files changed, 38 insertions, 58 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 16c673096a2..c80235206c0 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -220,23 +220,8 @@ config AUDIT_ARCH
bool
default y
-config S390_SWITCH_AMODE
- bool "Switch kernel/user addressing modes"
- help
- This option allows to switch the addressing modes of kernel and user
- space. The kernel parameter switch_amode=on will enable this feature,
- default is disabled. Enabling this (via kernel parameter) on machines
- earlier than IBM System z9-109 EC/BC will reduce system performance.
-
- Note that this option will also be selected by selecting the execute
- protection option below. Enabling the execute protection via the
- noexec kernel parameter will also switch the addressing modes,
- independent of the switch_amode kernel parameter.
-
-
config S390_EXEC_PROTECT
bool "Data execute protection"
- select S390_SWITCH_AMODE
help
This option allows to enable a buffer overflow protection for user
space programs and it also selects the addressing mode option above.
diff --git a/arch/s390/defconfig b/arch/s390/defconfig
index ab4464486b7..f4e53c6708d 100644
--- a/arch/s390/defconfig
+++ b/arch/s390/defconfig
@@ -185,7 +185,6 @@ CONFIG_HOTPLUG_CPU=y
CONFIG_COMPAT=y
CONFIG_SYSVIPC_COMPAT=y
CONFIG_AUDIT_ARCH=y
-CONFIG_S390_SWITCH_AMODE=y
CONFIG_S390_EXEC_PROTECT=y
#
diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h
index fc7edd6f41b..976e273988c 100644
--- a/arch/s390/include/asm/mmu_context.h
+++ b/arch/s390/include/asm/mmu_context.h
@@ -36,7 +36,7 @@ static inline int init_new_context(struct task_struct *tsk,
mm->context.has_pgste = 1;
mm->context.alloc_pgste = 1;
} else {
- mm->context.noexec = s390_noexec;
+ mm->context.noexec = (user_mode == SECONDARY_SPACE_MODE);
mm->context.has_pgste = 0;
mm->context.alloc_pgste = 0;
}
@@ -58,7 +58,7 @@ static inline void update_mm(struct mm_struct *mm, struct task_struct *tsk)
pgd_t *pgd = mm->pgd;
S390_lowcore.user_asce = mm->context.asce_bits | __pa(pgd);
- if (switch_amode) {
+ if (user_mode != HOME_SPACE_MODE) {
/* Load primary space page table origin. */
pgd = mm->context.noexec ? get_shadow_table(pgd) : pgd;
S390_lowcore.user_exec_asce = mm->context.asce_bits | __pa(pgd);
diff --git a/arch/s390/include/asm/pgalloc.h b/arch/s390/include/asm/pgalloc.h
index ddad5903341..68940d0bad9 100644
--- a/arch/s390/include/asm/pgalloc.h
+++ b/arch/s390/include/asm/pgalloc.h
@@ -143,7 +143,8 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm)
spin_lock_init(&mm->context.list_lock);
INIT_LIST_HEAD(&mm->context.crst_list);
INIT_LIST_HEAD(&mm->context.pgtable_list);
- return (pgd_t *) crst_table_alloc(mm, s390_noexec);
+ return (pgd_t *)
+ crst_table_alloc(mm, user_mode == SECONDARY_SPACE_MODE);
}
#define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd)
diff --git a/arch/s390/include/asm/setup.h b/arch/s390/include/asm/setup.h
index e37478e8728..52a779c337e 100644
--- a/arch/s390/include/asm/setup.h
+++ b/arch/s390/include/asm/setup.h
@@ -49,17 +49,12 @@ extern unsigned long memory_end;
void detect_memory_layout(struct mem_chunk chunk[]);
-#ifdef CONFIG_S390_SWITCH_AMODE
-extern unsigned int switch_amode;
-#else
-#define switch_amode (0)
-#endif
-
-#ifdef CONFIG_S390_EXEC_PROTECT
-extern unsigned int s390_noexec;
-#else
-#define s390_noexec (0)
-#endif
+#define PRIMARY_SPACE_MODE 0
+#define ACCESS_REGISTER_MODE 1
+#define SECONDARY_SPACE_MODE 2
+#define HOME_SPACE_MODE 3
+
+extern unsigned int user_mode;
/*
* Machine features detected in head.S
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 061479ff029..0663287fa1b 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -305,9 +305,8 @@ static int __init early_parse_mem(char *p)
}
early_param("mem", early_parse_mem);
-#ifdef CONFIG_S390_SWITCH_AMODE
-unsigned int switch_amode = 0;
-EXPORT_SYMBOL_GPL(switch_amode);
+unsigned int user_mode = HOME_SPACE_MODE;
+EXPORT_SYMBOL_GPL(user_mode);
static int set_amode_and_uaccess(unsigned long user_amode,
unsigned long user32_amode)
@@ -340,23 +339,29 @@ static int set_amode_and_uaccess(unsigned long user_amode,
*/
static int __init early_parse_switch_amode(char *p)
{
- switch_amode = 1;
+ if (user_mode != SECONDARY_SPACE_MODE)
+ user_mode = PRIMARY_SPACE_MODE;
return 0;
}
early_param("switch_amode", early_parse_switch_amode);
-#else /* CONFIG_S390_SWITCH_AMODE */
-static inline int set_amode_and_uaccess(unsigned long user_amode,
- unsigned long user32_amode)
+static int __init early_parse_user_mode(char *p)
{
+ if (p && strcmp(p, "primary") == 0)
+ user_mode = PRIMARY_SPACE_MODE;
+#ifdef CONFIG_S390_EXEC_PROTECT
+ else if (p && strcmp(p, "secondary") == 0)
+ user_mode = SECONDARY_SPACE_MODE;
+#endif
+ else if (!p || strcmp(p, "home") == 0)
+ user_mode = HOME_SPACE_MODE;
+ else
+ return 1;
return 0;
}
-#endif /* CONFIG_S390_SWITCH_AMODE */
+early_param("user_mode", early_parse_user_mode);
#ifdef CONFIG_S390_EXEC_PROTECT
-unsigned int s390_noexec = 0;
-EXPORT_SYMBOL_GPL(s390_noexec);
-
/*
* Enable execute protection?
*/
@@ -364,8 +369,7 @@ static int __init early_parse_noexec(char *p)
{
if (!strncmp(p, "off", 3))
return 0;
- switch_amode = 1;
- s390_noexec = 1;
+ user_mode = SECONDARY_SPACE_MODE;
return 0;
}
early_param("noexec", early_parse_noexec);
@@ -373,7 +377,7 @@ early_param("noexec", early_parse_noexec);
static void setup_addressing_mode(void)
{
- if (s390_noexec) {
+ if (user_mode == SECONDARY_SPACE_MODE) {
if (set_amode_and_uaccess(PSW_ASC_SECONDARY,
PSW32_ASC_SECONDARY))
pr_info("Execute protection active, "
@@ -381,7 +385,7 @@ static void setup_addressing_mode(void)
else
pr_info("Execute protection active, "
"mvcos not available\n");
- } else if (switch_amode) {
+ } else if (user_mode == PRIMARY_SPACE_MODE) {
if (set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY))
pr_info("Address spaces switched, "
"mvcos available\n");
@@ -411,7 +415,7 @@ setup_lowcore(void)
lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
lc->restart_psw.addr =
PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
- if (switch_amode)
+ if (user_mode != HOME_SPACE_MODE)
lc->restart_psw.mask |= PSW_ASC_HOME;
lc->external_new_psw.mask = psw_kernel_bits;
lc->external_new_psw.addr =
diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c
index adfb32aa6d5..5f99e66c51c 100644
--- a/arch/s390/kernel/vdso.c
+++ b/arch/s390/kernel/vdso.c
@@ -86,7 +86,8 @@ static void vdso_init_data(struct vdso_data *vd)
unsigned int facility_list;
facility_list = stfl();
- vd->ectg_available = switch_amode && (facility_list & 1);
+ vd->ectg_available =
+ user_mode != HOME_SPACE_MODE && (facility_list & 1);
}
#ifdef CONFIG_64BIT
@@ -114,7 +115,7 @@ int vdso_alloc_per_cpu(int cpu, struct _lowcore *lowcore)
lowcore->vdso_per_cpu_data = __LC_PASTE;
- if (!switch_amode || !vdso_enabled)
+ if (user_mode == HOME_SPACE_MODE || !vdso_enabled)
return 0;
segment_table = __get_free_pages(GFP_KERNEL, SEGMENT_ORDER);
@@ -160,7 +161,7 @@ void vdso_free_per_cpu(int cpu, struct _lowcore *lowcore)
unsigned long segment_table, page_table, page_frame;
u32 *psal, *aste;
- if (!switch_amode || !vdso_enabled)
+ if (user_mode == HOME_SPACE_MODE || !vdso_enabled)
return;
psal = (u32 *)(addr_t) lowcore->paste[4];
@@ -184,7 +185,7 @@ static void __vdso_init_cr5(void *dummy)
static void vdso_init_cr5(void)
{
- if (switch_amode && vdso_enabled)
+ if (user_mode != HOME_SPACE_MODE && vdso_enabled)
on_each_cpu(__vdso_init_cr5, NULL, 1);
}
#endif /* CONFIG_64BIT */
diff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig
index bf164fc2186..6ee55ae84ce 100644
--- a/arch/s390/kvm/Kconfig
+++ b/arch/s390/kvm/Kconfig
@@ -20,7 +20,6 @@ config KVM
depends on HAVE_KVM && EXPERIMENTAL
select PREEMPT_NOTIFIERS
select ANON_INODES
- select S390_SWITCH_AMODE
---help---
Support hosting paravirtualized guest machines using the SIE
virtualization capability on the mainframe. This should work
diff --git a/arch/s390/lib/uaccess_mvcos.c b/arch/s390/lib/uaccess_mvcos.c
index 58da3f46121..60455f104ea 100644
--- a/arch/s390/lib/uaccess_mvcos.c
+++ b/arch/s390/lib/uaccess_mvcos.c
@@ -162,7 +162,6 @@ static size_t clear_user_mvcos(size_t size, void __user *to)
return size;
}
-#ifdef CONFIG_S390_SWITCH_AMODE
static size_t strnlen_user_mvcos(size_t count, const char __user *src)
{
char buf[256];
@@ -200,7 +199,6 @@ static size_t strncpy_from_user_mvcos(size_t count, const char __user *src,
} while ((len_str == len) && (done < count));
return done;
}
-#endif /* CONFIG_S390_SWITCH_AMODE */
struct uaccess_ops uaccess_mvcos = {
.copy_from_user = copy_from_user_mvcos_check,
@@ -215,7 +213,6 @@ struct uaccess_ops uaccess_mvcos = {
.futex_atomic_cmpxchg = futex_atomic_cmpxchg_std,
};
-#ifdef CONFIG_S390_SWITCH_AMODE
struct uaccess_ops uaccess_mvcos_switch = {
.copy_from_user = copy_from_user_mvcos,
.copy_from_user_small = copy_from_user_mvcos,
@@ -228,4 +225,3 @@ struct uaccess_ops uaccess_mvcos_switch = {
.futex_atomic_op = futex_atomic_op_pt,
.futex_atomic_cmpxchg = futex_atomic_cmpxchg_pt,
};
-#endif
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 3df5b918cfe..77108e34fc1 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -112,7 +112,7 @@ static inline int user_space_fault(unsigned long trans_exc_code)
if (trans_exc_code == 2)
/* Access via secondary space, set_fs setting decides */
return current->thread.mm_segment.ar4;
- if (!switch_amode)
+ if (user_mode == HOME_SPACE_MODE)
/* User space if the access has been done via home space. */
return trans_exc_code == 3;
/*
@@ -168,7 +168,7 @@ static void do_no_context(struct pt_regs *regs, unsigned long error_code,
* terminate things with extreme prejudice.
*/
address = trans_exc_code & __FAIL_ADDR_MASK;
- if (user_space_fault(trans_exc_code) == 0)
+ if (!user_space_fault(trans_exc_code))
printk(KERN_ALERT "Unable to handle kernel pointer dereference"
" at virtual kernel address %p\n", (void *)address);
else
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index 2757c5616a0..ad621e06ada 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -269,7 +269,7 @@ int s390_enable_sie(void)
struct mm_struct *mm, *old_mm;
/* Do we have switched amode? If no, we cannot do sie */
- if (!switch_amode)
+ if (user_mode == HOME_SPACE_MODE)
return -EINVAL;
/* Do we have pgstes? if yes, we are done */
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-15 07:20:35 +0000