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-rw-r--r--arch/s390/include/asm/cpacf.h109
-rw-r--r--arch/s390/include/asm/ftrace.h8
-rw-r--r--arch/s390/include/asm/gmap.h2
-rw-r--r--arch/s390/include/asm/mmu.h5
-rw-r--r--arch/s390/include/asm/mmu_context.h1
-rw-r--r--arch/s390/include/asm/pgtable.h20
-rw-r--r--arch/s390/include/asm/processor.h1
-rw-r--r--arch/s390/include/asm/stacktrace.h12
8 files changed, 127 insertions, 31 deletions
diff --git a/arch/s390/include/asm/cpacf.h b/arch/s390/include/asm/cpacf.h
index b378e2b57a..c786538e39 100644
--- a/arch/s390/include/asm/cpacf.h
+++ b/arch/s390/include/asm/cpacf.h
@@ -166,28 +166,86 @@
typedef struct { unsigned char bytes[16]; } cpacf_mask_t;
-/**
- * cpacf_query() - check if a specific CPACF function is available
- * @opcode: the opcode of the crypto instruction
- * @func: the function code to test for
- *
- * Executes the query function for the given crypto instruction @opcode
- * and checks if @func is available
- *
- * Returns 1 if @func is available for @opcode, 0 otherwise
+/*
+ * Prototype for a not existing function to produce a link
+ * error if __cpacf_query() or __cpacf_check_opcode() is used
+ * with an invalid compile time const opcode.
*/
-static __always_inline void __cpacf_query(unsigned int opcode, cpacf_mask_t *mask)
+void __cpacf_bad_opcode(void);
+
+static __always_inline void __cpacf_query_rre(u32 opc, u8 r1, u8 r2,
+ cpacf_mask_t *mask)
{
asm volatile(
- " lghi 0,0\n" /* query function */
- " lgr 1,%[mask]\n"
- " spm 0\n" /* pckmo doesn't change the cc */
- /* Parameter regs are ignored, but must be nonzero and unique */
- "0: .insn rrf,%[opc] << 16,2,4,6,0\n"
- " brc 1,0b\n" /* handle partial completion */
- : "=m" (*mask)
- : [mask] "d" ((unsigned long)mask), [opc] "i" (opcode)
- : "cc", "0", "1");
+ " la %%r1,%[mask]\n"
+ " xgr %%r0,%%r0\n"
+ " .insn rre,%[opc] << 16,%[r1],%[r2]\n"
+ : [mask] "=R" (*mask)
+ : [opc] "i" (opc),
+ [r1] "i" (r1), [r2] "i" (r2)
+ : "cc", "r0", "r1");
+}
+
+static __always_inline void __cpacf_query_rrf(u32 opc,
+ u8 r1, u8 r2, u8 r3, u8 m4,
+ cpacf_mask_t *mask)
+{
+ asm volatile(
+ " la %%r1,%[mask]\n"
+ " xgr %%r0,%%r0\n"
+ " .insn rrf,%[opc] << 16,%[r1],%[r2],%[r3],%[m4]\n"
+ : [mask] "=R" (*mask)
+ : [opc] "i" (opc), [r1] "i" (r1), [r2] "i" (r2),
+ [r3] "i" (r3), [m4] "i" (m4)
+ : "cc", "r0", "r1");
+}
+
+static __always_inline void __cpacf_query(unsigned int opcode,
+ cpacf_mask_t *mask)
+{
+ switch (opcode) {
+ case CPACF_KDSA:
+ __cpacf_query_rre(CPACF_KDSA, 0, 2, mask);
+ break;
+ case CPACF_KIMD:
+ __cpacf_query_rre(CPACF_KIMD, 0, 2, mask);
+ break;
+ case CPACF_KLMD:
+ __cpacf_query_rre(CPACF_KLMD, 0, 2, mask);
+ break;
+ case CPACF_KM:
+ __cpacf_query_rre(CPACF_KM, 2, 4, mask);
+ break;
+ case CPACF_KMA:
+ __cpacf_query_rrf(CPACF_KMA, 2, 4, 6, 0, mask);
+ break;
+ case CPACF_KMAC:
+ __cpacf_query_rre(CPACF_KMAC, 0, 2, mask);
+ break;
+ case CPACF_KMC:
+ __cpacf_query_rre(CPACF_KMC, 2, 4, mask);
+ break;
+ case CPACF_KMCTR:
+ __cpacf_query_rrf(CPACF_KMCTR, 2, 4, 6, 0, mask);
+ break;
+ case CPACF_KMF:
+ __cpacf_query_rre(CPACF_KMF, 2, 4, mask);
+ break;
+ case CPACF_KMO:
+ __cpacf_query_rre(CPACF_KMO, 2, 4, mask);
+ break;
+ case CPACF_PCC:
+ __cpacf_query_rre(CPACF_PCC, 0, 0, mask);
+ break;
+ case CPACF_PCKMO:
+ __cpacf_query_rre(CPACF_PCKMO, 0, 0, mask);
+ break;
+ case CPACF_PRNO:
+ __cpacf_query_rre(CPACF_PRNO, 2, 4, mask);
+ break;
+ default:
+ __cpacf_bad_opcode();
+ }
}
static __always_inline int __cpacf_check_opcode(unsigned int opcode)
@@ -211,10 +269,21 @@ static __always_inline int __cpacf_check_opcode(unsigned int opcode)
case CPACF_KMA:
return test_facility(146); /* check for MSA8 */
default:
- BUG();
+ __cpacf_bad_opcode();
+ return 0;
}
}
+/**
+ * cpacf_query() - check if a specific CPACF function is available
+ * @opcode: the opcode of the crypto instruction
+ * @func: the function code to test for
+ *
+ * Executes the query function for the given crypto instruction @opcode
+ * and checks if @func is available
+ *
+ * Returns 1 if @func is available for @opcode, 0 otherwise
+ */
static __always_inline int cpacf_query(unsigned int opcode, cpacf_mask_t *mask)
{
if (__cpacf_check_opcode(opcode)) {
diff --git a/arch/s390/include/asm/ftrace.h b/arch/s390/include/asm/ftrace.h
index 621f23d5ae..77e479d44f 100644
--- a/arch/s390/include/asm/ftrace.h
+++ b/arch/s390/include/asm/ftrace.h
@@ -8,12 +8,8 @@
#ifndef __ASSEMBLY__
-#ifdef CONFIG_CC_IS_CLANG
-/* https://llvm.org/pr41424 */
-#define ftrace_return_address(n) 0UL
-#else
-#define ftrace_return_address(n) __builtin_return_address(n)
-#endif
+unsigned long return_address(unsigned int n);
+#define ftrace_return_address(n) return_address(n)
void ftrace_caller(void);
diff --git a/arch/s390/include/asm/gmap.h b/arch/s390/include/asm/gmap.h
index 5cc46e0dde..9725586f42 100644
--- a/arch/s390/include/asm/gmap.h
+++ b/arch/s390/include/asm/gmap.h
@@ -146,7 +146,7 @@ int gmap_mprotect_notify(struct gmap *, unsigned long start,
void gmap_sync_dirty_log_pmd(struct gmap *gmap, unsigned long dirty_bitmap[4],
unsigned long gaddr, unsigned long vmaddr);
-int gmap_mark_unmergeable(void);
+int s390_disable_cow_sharing(void);
void s390_unlist_old_asce(struct gmap *gmap);
int s390_replace_asce(struct gmap *gmap);
void s390_uv_destroy_pfns(unsigned long count, unsigned long *pfns);
diff --git a/arch/s390/include/asm/mmu.h b/arch/s390/include/asm/mmu.h
index bb1b4bef18..4c2dc7abc2 100644
--- a/arch/s390/include/asm/mmu.h
+++ b/arch/s390/include/asm/mmu.h
@@ -32,6 +32,11 @@ typedef struct {
unsigned int uses_skeys:1;
/* The mmu context uses CMM. */
unsigned int uses_cmm:1;
+ /*
+ * The mmu context allows COW-sharing of memory pages (KSM, zeropage).
+ * Note that COW-sharing during fork() is currently always allowed.
+ */
+ unsigned int allow_cow_sharing:1;
/* The gmaps associated with this context are allowed to use huge pages. */
unsigned int allow_gmap_hpage_1m:1;
} mm_context_t;
diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h
index 929af18b09..a7789a9f62 100644
--- a/arch/s390/include/asm/mmu_context.h
+++ b/arch/s390/include/asm/mmu_context.h
@@ -35,6 +35,7 @@ static inline int init_new_context(struct task_struct *tsk,
mm->context.has_pgste = 0;
mm->context.uses_skeys = 0;
mm->context.uses_cmm = 0;
+ mm->context.allow_cow_sharing = 1;
mm->context.allow_gmap_hpage_1m = 0;
#endif
switch (mm->context.asce_limit) {
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 60950e7a25..1077c1daec 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -566,10 +566,20 @@ static inline pud_t set_pud_bit(pud_t pud, pgprot_t prot)
}
/*
- * In the case that a guest uses storage keys
- * faults should no longer be backed by zero pages
+ * As soon as the guest uses storage keys or enables PV, we deduplicate all
+ * mapped shared zeropages and prevent new shared zeropages from getting
+ * mapped.
*/
-#define mm_forbids_zeropage mm_has_pgste
+#define mm_forbids_zeropage mm_forbids_zeropage
+static inline int mm_forbids_zeropage(struct mm_struct *mm)
+{
+#ifdef CONFIG_PGSTE
+ if (!mm->context.allow_cow_sharing)
+ return 1;
+#endif
+ return 0;
+}
+
static inline int mm_uses_skeys(struct mm_struct *mm)
{
#ifdef CONFIG_PGSTE
@@ -1768,8 +1778,10 @@ static inline pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma,
static inline pmd_t pmdp_invalidate(struct vm_area_struct *vma,
unsigned long addr, pmd_t *pmdp)
{
- pmd_t pmd = __pmd(pmd_val(*pmdp) | _SEGMENT_ENTRY_INVALID);
+ pmd_t pmd;
+ VM_WARN_ON_ONCE(!pmd_present(*pmdp));
+ pmd = __pmd(pmd_val(*pmdp) | _SEGMENT_ENTRY_INVALID);
return pmdp_xchg_direct(vma->vm_mm, addr, pmdp, pmd);
}
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index db9982f0e8..bbbdc5abe2 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -98,6 +98,7 @@ void cpu_detect_mhz_feature(void);
extern const struct seq_operations cpuinfo_op;
extern void execve_tail(void);
+unsigned long vdso_text_size(void);
unsigned long vdso_size(void);
/*
diff --git a/arch/s390/include/asm/stacktrace.h b/arch/s390/include/asm/stacktrace.h
index 433fde85b1..85b6738b82 100644
--- a/arch/s390/include/asm/stacktrace.h
+++ b/arch/s390/include/asm/stacktrace.h
@@ -2,6 +2,7 @@
#ifndef _ASM_S390_STACKTRACE_H
#define _ASM_S390_STACKTRACE_H
+#include <linux/stacktrace.h>
#include <linux/uaccess.h>
#include <linux/ptrace.h>
@@ -12,6 +13,17 @@ struct stack_frame_user {
unsigned long empty2[4];
};
+struct stack_frame_vdso_wrapper {
+ struct stack_frame_user sf;
+ unsigned long return_address;
+};
+
+struct perf_callchain_entry_ctx;
+
+void arch_stack_walk_user_common(stack_trace_consume_fn consume_entry, void *cookie,
+ struct perf_callchain_entry_ctx *entry,
+ const struct pt_regs *regs, bool perf);
+
enum stack_type {
STACK_TYPE_UNKNOWN,
STACK_TYPE_TASK,