[S390] noexec protection
This provides a noexec protection on s390 hardware. Our hardware does
not have any bits left in the pte for a hw noexec bit, so this is a
different approach using shadow page tables and a special addressing
mode that allows separate address spaces for code and data.
As a special feature of our "secondary-space" addressing mode, separate
page tables can be specified for the translation of data addresses
(storage operands) and instruction addresses. The shadow page table is
used for the instruction addresses and the standard page table for the
data addresses.
The shadow page table is linked to the standard page table by a pointer
in page->lru.next of the struct page corresponding to the page that
contains the standard page table (since page->private is not really
private with the pte_lock and the page table pages are not in the LRU
list).
Depending on the software bits of a pte, it is either inserted into
both page tables or just into the standard (data) page table. Pages of
a vma that does not have the VM_EXEC bit set get mapped only in the
data address space. Any try to execute code on such a page will cause a
page translation exception. The standard reaction to this is a SIGSEGV
with two exceptions: the two system call opcodes 0x0a77 (sys_sigreturn)
and 0x0aad (sys_rt_sigreturn) are allowed. They are stored by the
kernel to the signal stack frame. Unfortunately, the signal return
mechanism cannot be modified to use an SA_RESTORER because the
exception unwinding code depends on the system call opcode stored
behind the signal stack frame.
This feature requires that user space is executed in secondary-space
mode and the kernel in home-space mode, which means that the addressing
modes need to be switched and that the noexec protection only works
for user space.
After switching the addressing modes, we cannot use the mvcp/mvcs
instructions anymore to copy between kernel and user space. A new
mvcos instruction has been added to the z9 EC/BC hardware which allows
to copy between arbitrary address spaces, but on older hardware the
page tables need to be walked manually.
Signed-off-by: Gerald Schaefer <geraldsc@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/include/asm-s390/compat.h b/include/asm-s390/compat.h
index 356a0b1..296f4f1 100644
--- a/include/asm-s390/compat.h
+++ b/include/asm-s390/compat.h
@@ -6,6 +6,34 @@
#include <linux/types.h>
#include <linux/sched.h>
+#define PSW32_MASK_PER 0x40000000UL
+#define PSW32_MASK_DAT 0x04000000UL
+#define PSW32_MASK_IO 0x02000000UL
+#define PSW32_MASK_EXT 0x01000000UL
+#define PSW32_MASK_KEY 0x00F00000UL
+#define PSW32_MASK_MCHECK 0x00040000UL
+#define PSW32_MASK_WAIT 0x00020000UL
+#define PSW32_MASK_PSTATE 0x00010000UL
+#define PSW32_MASK_ASC 0x0000C000UL
+#define PSW32_MASK_CC 0x00003000UL
+#define PSW32_MASK_PM 0x00000f00UL
+
+#define PSW32_ADDR_AMODE31 0x80000000UL
+#define PSW32_ADDR_INSN 0x7FFFFFFFUL
+
+#define PSW32_BASE_BITS 0x00080000UL
+
+#define PSW32_ASC_PRIMARY 0x00000000UL
+#define PSW32_ASC_ACCREG 0x00004000UL
+#define PSW32_ASC_SECONDARY 0x00008000UL
+#define PSW32_ASC_HOME 0x0000C000UL
+
+#define PSW32_MASK_MERGE(CURRENT,NEW) \
+ (((CURRENT) & ~(PSW32_MASK_CC|PSW32_MASK_PM)) | \
+ ((NEW) & (PSW32_MASK_CC|PSW32_MASK_PM)))
+
+extern long psw32_user_bits;
+
#define COMPAT_USER_HZ 100
typedef u32 compat_size_t;
diff --git a/include/asm-s390/lowcore.h b/include/asm-s390/lowcore.h
index 74f7389..4a31d0a 100644
--- a/include/asm-s390/lowcore.h
+++ b/include/asm-s390/lowcore.h
@@ -220,7 +220,8 @@
__u32 kernel_asce; /* 0xc4c */
__u32 user_asce; /* 0xc50 */
__u32 panic_stack; /* 0xc54 */
- __u8 pad10[0xc60-0xc58]; /* 0xc58 */
+ __u32 user_exec_asce; /* 0xc58 */
+ __u8 pad10[0xc60-0xc5c]; /* 0xc5c */
/* entry.S sensitive area start */
struct cpuinfo_S390 cpu_data; /* 0xc60 */
__u32 ipl_device; /* 0xc7c */
@@ -310,7 +311,8 @@
__u64 kernel_asce; /* 0xd58 */
__u64 user_asce; /* 0xd60 */
__u64 panic_stack; /* 0xd68 */
- __u8 pad10[0xd80-0xd70]; /* 0xd70 */
+ __u64 user_exec_asce; /* 0xd70 */
+ __u8 pad10[0xd80-0xd78]; /* 0xd78 */
/* entry.S sensitive area start */
struct cpuinfo_S390 cpu_data; /* 0xd80 */
__u32 ipl_device; /* 0xdb8 */
diff --git a/include/asm-s390/mmu_context.h b/include/asm-s390/mmu_context.h
index bcf24a8..1d21da2 100644
--- a/include/asm-s390/mmu_context.h
+++ b/include/asm-s390/mmu_context.h
@@ -9,6 +9,7 @@
#ifndef __S390_MMU_CONTEXT_H
#define __S390_MMU_CONTEXT_H
+#include <asm/pgalloc.h>
/*
* get a new mmu context.. S390 don't know about contexts.
*/
@@ -16,29 +17,44 @@
#define destroy_context(mm) do { } while (0)
+#ifndef __s390x__
+#define LCTL_OPCODE "lctl"
+#define PGTABLE_BITS (_SEGMENT_TABLE|USER_STD_MASK)
+#else
+#define LCTL_OPCODE "lctlg"
+#define PGTABLE_BITS (_REGION_TABLE|USER_STD_MASK)
+#endif
+
static inline void enter_lazy_tlb(struct mm_struct *mm,
struct task_struct *tsk)
{
}
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
- struct task_struct *tsk)
+ struct task_struct *tsk)
{
- if (prev != next) {
-#ifndef __s390x__
- S390_lowcore.user_asce = (__pa(next->pgd)&PAGE_MASK) |
- (_SEGMENT_TABLE|USER_STD_MASK);
- /* Load home space page table origin. */
- asm volatile("lctl 13,13,%0"
- : : "m" (S390_lowcore.user_asce) );
-#else /* __s390x__ */
- S390_lowcore.user_asce = (__pa(next->pgd) & PAGE_MASK) |
- (_REGION_TABLE|USER_STD_MASK);
- /* Load home space page table origin. */
- asm volatile("lctlg 13,13,%0"
- : : "m" (S390_lowcore.user_asce) );
-#endif /* __s390x__ */
- }
+ pgd_t *shadow_pgd = get_shadow_pgd(next->pgd);
+
+ if (prev != next) {
+ S390_lowcore.user_asce = (__pa(next->pgd) & PAGE_MASK) |
+ PGTABLE_BITS;
+ if (shadow_pgd) {
+ /* Load primary/secondary space page table origin. */
+ S390_lowcore.user_exec_asce =
+ (__pa(shadow_pgd) & PAGE_MASK) | PGTABLE_BITS;
+ asm volatile(LCTL_OPCODE" 1,1,%0\n"
+ LCTL_OPCODE" 7,7,%1"
+ : : "m" (S390_lowcore.user_exec_asce),
+ "m" (S390_lowcore.user_asce) );
+ } else if (switch_amode) {
+ /* Load primary space page table origin. */
+ asm volatile(LCTL_OPCODE" 1,1,%0"
+ : : "m" (S390_lowcore.user_asce) );
+ } else
+ /* Load home space page table origin. */
+ asm volatile(LCTL_OPCODE" 13,13,%0"
+ : : "m" (S390_lowcore.user_asce) );
+ }
cpu_set(smp_processor_id(), next->cpu_vm_mask);
}
@@ -51,4 +67,4 @@
set_fs(current->thread.mm_segment);
}
-#endif
+#endif /* __S390_MMU_CONTEXT_H */
diff --git a/include/asm-s390/pgalloc.h b/include/asm-s390/pgalloc.h
index 0707a7e..56c8a6c 100644
--- a/include/asm-s390/pgalloc.h
+++ b/include/asm-s390/pgalloc.h
@@ -47,6 +47,17 @@
if (!pgd)
return NULL;
+ if (s390_noexec) {
+ pgd_t *shadow_pgd = (pgd_t *)
+ __get_free_pages(GFP_KERNEL, PGD_ALLOC_ORDER);
+ struct page *page = virt_to_page(pgd);
+
+ if (!shadow_pgd) {
+ free_pages((unsigned long) pgd, PGD_ALLOC_ORDER);
+ return NULL;
+ }
+ page->lru.next = (void *) shadow_pgd;
+ }
for (i = 0; i < PTRS_PER_PGD; i++)
#ifndef __s390x__
pmd_clear(pmd_offset(pgd + i, i*PGDIR_SIZE));
@@ -58,6 +69,10 @@
static inline void pgd_free(pgd_t *pgd)
{
+ pgd_t *shadow_pgd = get_shadow_pgd(pgd);
+
+ if (shadow_pgd)
+ free_pages((unsigned long) shadow_pgd, PGD_ALLOC_ORDER);
free_pages((unsigned long) pgd, PGD_ALLOC_ORDER);
}
@@ -71,6 +86,7 @@
#define pmd_free(x) do { } while (0)
#define __pmd_free_tlb(tlb,x) do { } while (0)
#define pgd_populate(mm, pmd, pte) BUG()
+#define pgd_populate_kernel(mm, pmd, pte) BUG()
#else /* __s390x__ */
static inline pmd_t * pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr)
{
@@ -79,6 +95,17 @@
if (!pmd)
return NULL;
+ if (s390_noexec) {
+ pmd_t *shadow_pmd = (pmd_t *)
+ __get_free_pages(GFP_KERNEL, PMD_ALLOC_ORDER);
+ struct page *page = virt_to_page(pmd);
+
+ if (!shadow_pmd) {
+ free_pages((unsigned long) pmd, PMD_ALLOC_ORDER);
+ return NULL;
+ }
+ page->lru.next = (void *) shadow_pmd;
+ }
for (i=0; i < PTRS_PER_PMD; i++)
pmd_clear(pmd + i);
return pmd;
@@ -86,6 +113,10 @@
static inline void pmd_free (pmd_t *pmd)
{
+ pmd_t *shadow_pmd = get_shadow_pmd(pmd);
+
+ if (shadow_pmd)
+ free_pages((unsigned long) shadow_pmd, PMD_ALLOC_ORDER);
free_pages((unsigned long) pmd, PMD_ALLOC_ORDER);
}
@@ -95,11 +126,22 @@
pmd_free(pmd); \
} while (0)
-static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
+static inline void
+pgd_populate_kernel(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
{
pgd_val(*pgd) = _PGD_ENTRY | __pa(pmd);
}
+static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
+{
+ pgd_t *shadow_pgd = get_shadow_pgd(pgd);
+ pmd_t *shadow_pmd = get_shadow_pmd(pmd);
+
+ if (shadow_pgd && shadow_pmd)
+ pgd_populate_kernel(mm, shadow_pgd, shadow_pmd);
+ pgd_populate_kernel(mm, pgd, pmd);
+}
+
#endif /* __s390x__ */
static inline void
@@ -119,7 +161,13 @@
static inline void
pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page)
{
- pmd_populate_kernel(mm, pmd, (pte_t *)page_to_phys(page));
+ pte_t *pte = (pte_t *)page_to_phys(page);
+ pmd_t *shadow_pmd = get_shadow_pmd(pmd);
+ pte_t *shadow_pte = get_shadow_pte(pte);
+
+ pmd_populate_kernel(mm, pmd, pte);
+ if (shadow_pmd && shadow_pte)
+ pmd_populate_kernel(mm, shadow_pmd, shadow_pte);
}
/*
@@ -133,6 +181,17 @@
if (!pte)
return NULL;
+ if (s390_noexec) {
+ pte_t *shadow_pte = (pte_t *)
+ __get_free_page(GFP_KERNEL|__GFP_REPEAT);
+ struct page *page = virt_to_page(pte);
+
+ if (!shadow_pte) {
+ free_page((unsigned long) pte);
+ return NULL;
+ }
+ page->lru.next = (void *) shadow_pte;
+ }
for (i=0; i < PTRS_PER_PTE; i++) {
pte_clear(mm, vmaddr, pte + i);
vmaddr += PAGE_SIZE;
@@ -151,14 +210,30 @@
static inline void pte_free_kernel(pte_t *pte)
{
- free_page((unsigned long) pte);
+ pte_t *shadow_pte = get_shadow_pte(pte);
+
+ if (shadow_pte)
+ free_page((unsigned long) shadow_pte);
+ free_page((unsigned long) pte);
}
static inline void pte_free(struct page *pte)
{
- __free_page(pte);
+ struct page *shadow_page = get_shadow_page(pte);
+
+ if (shadow_page)
+ __free_page(shadow_page);
+ __free_page(pte);
}
-#define __pte_free_tlb(tlb,pte) tlb_remove_page(tlb,pte)
+#define __pte_free_tlb(tlb, pte) \
+({ \
+ struct mmu_gather *__tlb = (tlb); \
+ struct page *__pte = (pte); \
+ struct page *shadow_page = get_shadow_page(__pte); \
+ if (shadow_page) \
+ tlb_remove_page(__tlb, shadow_page); \
+ tlb_remove_page(__tlb, __pte); \
+})
#endif /* _S390_PGALLOC_H */
diff --git a/include/asm-s390/pgtable.h b/include/asm-s390/pgtable.h
index 304ee77..13c1654 100644
--- a/include/asm-s390/pgtable.h
+++ b/include/asm-s390/pgtable.h
@@ -224,6 +224,8 @@
#define _PAGE_TYPE_FILE 0x601 /* bit 0x002 is used for offset !! */
#define _PAGE_TYPE_RO 0x200
#define _PAGE_TYPE_RW 0x000
+#define _PAGE_TYPE_EX_RO 0x202
+#define _PAGE_TYPE_EX_RW 0x002
/*
* PTE type bits are rather complicated. handle_pte_fault uses pte_present,
@@ -244,11 +246,13 @@
* _PAGE_TYPE_FILE 11?1 -> 11?1
* _PAGE_TYPE_RO 0100 -> 1100
* _PAGE_TYPE_RW 0000 -> 1000
+ * _PAGE_TYPE_EX_RO 0110 -> 1110
+ * _PAGE_TYPE_EX_RW 0010 -> 1010
*
- * pte_none is true for bits combinations 1000, 1100
+ * pte_none is true for bits combinations 1000, 1010, 1100, 1110
* pte_present is true for bits combinations 0000, 0010, 0100, 0110, 1001
* pte_file is true for bits combinations 1101, 1111
- * swap pte is 1011 and 0001, 0011, 0101, 0111, 1010 and 1110 are invalid.
+ * swap pte is 1011 and 0001, 0011, 0101, 0111 are invalid.
*/
#ifndef __s390x__
@@ -313,33 +317,100 @@
#define PAGE_NONE __pgprot(_PAGE_TYPE_NONE)
#define PAGE_RO __pgprot(_PAGE_TYPE_RO)
#define PAGE_RW __pgprot(_PAGE_TYPE_RW)
+#define PAGE_EX_RO __pgprot(_PAGE_TYPE_EX_RO)
+#define PAGE_EX_RW __pgprot(_PAGE_TYPE_EX_RW)
#define PAGE_KERNEL PAGE_RW
#define PAGE_COPY PAGE_RO
/*
- * The S390 can't do page protection for execute, and considers that the
- * same are read. Also, write permissions imply read permissions. This is
- * the closest we can get..
+ * Dependent on the EXEC_PROTECT option s390 can do execute protection.
+ * Write permission always implies read permission. In theory with a
+ * primary/secondary page table execute only can be implemented but
+ * it would cost an additional bit in the pte to distinguish all the
+ * different pte types. To avoid that execute permission currently
+ * implies read permission as well.
*/
/*xwr*/
#define __P000 PAGE_NONE
#define __P001 PAGE_RO
#define __P010 PAGE_RO
#define __P011 PAGE_RO
-#define __P100 PAGE_RO
-#define __P101 PAGE_RO
-#define __P110 PAGE_RO
-#define __P111 PAGE_RO
+#define __P100 PAGE_EX_RO
+#define __P101 PAGE_EX_RO
+#define __P110 PAGE_EX_RO
+#define __P111 PAGE_EX_RO
#define __S000 PAGE_NONE
#define __S001 PAGE_RO
#define __S010 PAGE_RW
#define __S011 PAGE_RW
-#define __S100 PAGE_RO
-#define __S101 PAGE_RO
-#define __S110 PAGE_RW
-#define __S111 PAGE_RW
+#define __S100 PAGE_EX_RO
+#define __S101 PAGE_EX_RO
+#define __S110 PAGE_EX_RW
+#define __S111 PAGE_EX_RW
+
+#ifndef __s390x__
+# define PMD_SHADOW_SHIFT 1
+# define PGD_SHADOW_SHIFT 1
+#else /* __s390x__ */
+# define PMD_SHADOW_SHIFT 2
+# define PGD_SHADOW_SHIFT 2
+#endif /* __s390x__ */
+
+static inline struct page *get_shadow_page(struct page *page)
+{
+ if (s390_noexec && !list_empty(&page->lru))
+ return virt_to_page(page->lru.next);
+ return NULL;
+}
+
+static inline pte_t *get_shadow_pte(pte_t *ptep)
+{
+ unsigned long pteptr = (unsigned long) (ptep);
+
+ if (s390_noexec) {
+ unsigned long offset = pteptr & (PAGE_SIZE - 1);
+ void *addr = (void *) (pteptr ^ offset);
+ struct page *page = virt_to_page(addr);
+ if (!list_empty(&page->lru))
+ return (pte_t *) ((unsigned long) page->lru.next |
+ offset);
+ }
+ return NULL;
+}
+
+static inline pmd_t *get_shadow_pmd(pmd_t *pmdp)
+{
+ unsigned long pmdptr = (unsigned long) (pmdp);
+
+ if (s390_noexec) {
+ unsigned long offset = pmdptr &
+ ((PAGE_SIZE << PMD_SHADOW_SHIFT) - 1);
+ void *addr = (void *) (pmdptr ^ offset);
+ struct page *page = virt_to_page(addr);
+ if (!list_empty(&page->lru))
+ return (pmd_t *) ((unsigned long) page->lru.next |
+ offset);
+ }
+ return NULL;
+}
+
+static inline pgd_t *get_shadow_pgd(pgd_t *pgdp)
+{
+ unsigned long pgdptr = (unsigned long) (pgdp);
+
+ if (s390_noexec) {
+ unsigned long offset = pgdptr &
+ ((PAGE_SIZE << PGD_SHADOW_SHIFT) - 1);
+ void *addr = (void *) (pgdptr ^ offset);
+ struct page *page = virt_to_page(addr);
+ if (!list_empty(&page->lru))
+ return (pgd_t *) ((unsigned long) page->lru.next |
+ offset);
+ }
+ return NULL;
+}
/*
* Certain architectures need to do special things when PTEs
@@ -348,7 +419,16 @@
*/
static inline void set_pte(pte_t *pteptr, pte_t pteval)
{
+ pte_t *shadow_pte = get_shadow_pte(pteptr);
+
*pteptr = pteval;
+ if (shadow_pte) {
+ if (!(pte_val(pteval) & _PAGE_INVALID) &&
+ (pte_val(pteval) & _PAGE_SWX))
+ pte_val(*shadow_pte) = pte_val(pteval) | _PAGE_RO;
+ else
+ pte_val(*shadow_pte) = _PAGE_TYPE_EMPTY;
+ }
}
#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
@@ -466,7 +546,7 @@
static inline void pgd_clear(pgd_t * pgdp) { }
-static inline void pmd_clear(pmd_t * pmdp)
+static inline void pmd_clear_kernel(pmd_t * pmdp)
{
pmd_val(pmdp[0]) = _PAGE_TABLE_INV;
pmd_val(pmdp[1]) = _PAGE_TABLE_INV;
@@ -474,24 +554,55 @@
pmd_val(pmdp[3]) = _PAGE_TABLE_INV;
}
+static inline void pmd_clear(pmd_t * pmdp)
+{
+ pmd_t *shadow_pmd = get_shadow_pmd(pmdp);
+
+ pmd_clear_kernel(pmdp);
+ if (shadow_pmd)
+ pmd_clear_kernel(shadow_pmd);
+}
+
#else /* __s390x__ */
-static inline void pgd_clear(pgd_t * pgdp)
+static inline void pgd_clear_kernel(pgd_t * pgdp)
{
pgd_val(*pgdp) = _PGD_ENTRY_INV | _PGD_ENTRY;
}
-static inline void pmd_clear(pmd_t * pmdp)
+static inline void pgd_clear(pgd_t * pgdp)
+{
+ pgd_t *shadow_pgd = get_shadow_pgd(pgdp);
+
+ pgd_clear_kernel(pgdp);
+ if (shadow_pgd)
+ pgd_clear_kernel(shadow_pgd);
+}
+
+static inline void pmd_clear_kernel(pmd_t * pmdp)
{
pmd_val(*pmdp) = _PMD_ENTRY_INV | _PMD_ENTRY;
pmd_val1(*pmdp) = _PMD_ENTRY_INV | _PMD_ENTRY;
}
+static inline void pmd_clear(pmd_t * pmdp)
+{
+ pmd_t *shadow_pmd = get_shadow_pmd(pmdp);
+
+ pmd_clear_kernel(pmdp);
+ if (shadow_pmd)
+ pmd_clear_kernel(shadow_pmd);
+}
+
#endif /* __s390x__ */
static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
+ pte_t *shadow_pte = get_shadow_pte(ptep);
+
pte_val(*ptep) = _PAGE_TYPE_EMPTY;
+ if (shadow_pte)
+ pte_val(*shadow_pte) = _PAGE_TYPE_EMPTY;
}
/*
@@ -609,8 +720,11 @@
unsigned long address, pte_t *ptep)
{
pte_t pte = *ptep;
+ pte_t *shadow_pte = get_shadow_pte(ptep);
__ptep_ipte(address, ptep);
+ if (shadow_pte)
+ __ptep_ipte(address, shadow_pte);
return pte;
}
diff --git a/include/asm-s390/processor.h b/include/asm-s390/processor.h
index 7a7f50e..5af8535 100644
--- a/include/asm-s390/processor.h
+++ b/include/asm-s390/processor.h
@@ -145,7 +145,7 @@
#define start_thread(regs, new_psw, new_stackp) do { \
set_fs(USER_DS); \
- regs->psw.mask = PSW_USER_BITS; \
+ regs->psw.mask = psw_user_bits; \
regs->psw.addr = new_psw | PSW_ADDR_AMODE; \
regs->gprs[15] = new_stackp ; \
} while (0)
@@ -154,14 +154,14 @@
#define start_thread(regs, new_psw, new_stackp) do { \
set_fs(USER_DS); \
- regs->psw.mask = PSW_USER_BITS; \
+ regs->psw.mask = psw_user_bits; \
regs->psw.addr = new_psw; \
regs->gprs[15] = new_stackp; \
} while (0)
#define start_thread31(regs, new_psw, new_stackp) do { \
set_fs(USER_DS); \
- regs->psw.mask = PSW_USER32_BITS; \
+ regs->psw.mask = psw_user32_bits; \
regs->psw.addr = new_psw; \
regs->gprs[15] = new_stackp; \
} while (0)
diff --git a/include/asm-s390/ptrace.h b/include/asm-s390/ptrace.h
index 7b768c5..fa6ca87 100644
--- a/include/asm-s390/ptrace.h
+++ b/include/asm-s390/ptrace.h
@@ -266,17 +266,12 @@
#define PSW_ASC_SECONDARY 0x0000800000000000UL
#define PSW_ASC_HOME 0x0000C00000000000UL
-#define PSW_USER32_BITS (PSW_BASE32_BITS | PSW_MASK_DAT | PSW_ASC_HOME | \
- PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | \
- PSW_MASK_PSTATE | PSW_DEFAULT_KEY)
+extern long psw_user32_bits;
#endif /* __s390x__ */
-#define PSW_KERNEL_BITS (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY | \
- PSW_MASK_MCHECK | PSW_DEFAULT_KEY)
-#define PSW_USER_BITS (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | \
- PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | \
- PSW_MASK_PSTATE | PSW_DEFAULT_KEY)
+extern long psw_kernel_bits;
+extern long psw_user_bits;
/* This macro merges a NEW PSW mask specified by the user into
the currently active PSW mask CURRENT, modifying only those
diff --git a/include/asm-s390/setup.h b/include/asm-s390/setup.h
index 5427697..6b68ddd 100644
--- a/include/asm-s390/setup.h
+++ b/include/asm-s390/setup.h
@@ -42,6 +42,18 @@
extern struct mem_chunk memory_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
+
/*
* Machine features detected in head.S
*/
diff --git a/include/asm-s390/smp.h b/include/asm-s390/smp.h
index 2d9e153..b957e4c 100644
--- a/include/asm-s390/smp.h
+++ b/include/asm-s390/smp.h
@@ -110,7 +110,7 @@
static inline void smp_send_stop(void)
{
/* Disable all interrupts/machine checks */
- __load_psw_mask(PSW_KERNEL_BITS & ~PSW_MASK_MCHECK);
+ __load_psw_mask(psw_kernel_bits & ~PSW_MASK_MCHECK);
}
#define smp_cpu_not_running(cpu) 1
diff --git a/include/asm-s390/system.h b/include/asm-s390/system.h
index bd0b05a..bbe137c 100644
--- a/include/asm-s390/system.h
+++ b/include/asm-s390/system.h
@@ -373,8 +373,8 @@
__load_psw_mask(mask | (__raw_local_irq_stosm(0x00) & ~(-1UL >> 8)));
}
-#define local_mcck_enable() __set_psw_mask(PSW_KERNEL_BITS)
-#define local_mcck_disable() __set_psw_mask(PSW_KERNEL_BITS & ~PSW_MASK_MCHECK)
+#define local_mcck_enable() __set_psw_mask(psw_kernel_bits)
+#define local_mcck_disable() __set_psw_mask(psw_kernel_bits & ~PSW_MASK_MCHECK)
#ifdef CONFIG_SMP
diff --git a/include/asm-s390/tlbflush.h b/include/asm-s390/tlbflush.h
index fa4dc91..66793f5 100644
--- a/include/asm-s390/tlbflush.h
+++ b/include/asm-s390/tlbflush.h
@@ -3,6 +3,7 @@
#include <linux/mm.h>
#include <asm/processor.h>
+#include <asm/pgalloc.h>
/*
* TLB flushing:
@@ -102,6 +103,14 @@
if (unlikely(cpus_empty(mm->cpu_vm_mask)))
return;
if (MACHINE_HAS_IDTE) {
+ pgd_t *shadow_pgd = get_shadow_pgd(mm->pgd);
+
+ if (shadow_pgd) {
+ asm volatile(
+ " .insn rrf,0xb98e0000,0,%0,%1,0"
+ : : "a" (2048),
+ "a" (__pa(shadow_pgd) & PAGE_MASK) : "cc" );
+ }
asm volatile(
" .insn rrf,0xb98e0000,0,%0,%1,0"
: : "a" (2048), "a" (__pa(mm->pgd)&PAGE_MASK) : "cc");
diff --git a/include/asm-s390/uaccess.h b/include/asm-s390/uaccess.h
index 73ac4e8..0235970 100644
--- a/include/asm-s390/uaccess.h
+++ b/include/asm-s390/uaccess.h
@@ -90,6 +90,8 @@
extern struct uaccess_ops uaccess;
extern struct uaccess_ops uaccess_std;
extern struct uaccess_ops uaccess_mvcos;
+extern struct uaccess_ops uaccess_mvcos_switch;
+extern struct uaccess_ops uaccess_pt;
static inline int __put_user_fn(size_t size, void __user *ptr, void *x)
{
