1 files changed, 133 insertions, 0 deletions
diff --git a/tools/testing/selftests/vm/pkey-powerpc.h b/tools/testing/selftests/vm/pkey-powerpc.h
new file mode 100644
index 000000000000..1ebb586b2fbc
--- /dev/null
+++ b/tools/testing/selftests/vm/pkey-powerpc.h
@@ -0,0 +1,133 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _PKEYS_POWERPC_H
+#define _PKEYS_POWERPC_H
+
+#ifndef SYS_mprotect_key
+# define SYS_mprotect_key	386
+#endif
+#ifndef SYS_pkey_alloc
+# define SYS_pkey_alloc		384
+# define SYS_pkey_free		385
+#endif
+#define REG_IP_IDX		PT_NIP
+#define REG_TRAPNO		PT_TRAP
+#define gregs			gp_regs
+#define fpregs			fp_regs
+#define si_pkey_offset		0x20
+
+#undef PKEY_DISABLE_ACCESS
+#define PKEY_DISABLE_ACCESS	0x3  /* disable read and write */
+
+#undef PKEY_DISABLE_WRITE
+#define PKEY_DISABLE_WRITE	0x2
+
+#define NR_PKEYS		32
+#define NR_RESERVED_PKEYS_4K	27 /* pkey-0, pkey-1, exec-only-pkey
+				      and 24 other keys that cannot be
+				      represented in the PTE */
+#define NR_RESERVED_PKEYS_64K_3KEYS	3 /* PowerNV and KVM: pkey-0,
+					     pkey-1 and exec-only key */
+#define NR_RESERVED_PKEYS_64K_4KEYS	4 /* PowerVM: pkey-0, pkey-1,
+					     pkey-31 and exec-only key */
+#define PKEY_BITS_PER_PKEY	2
+#define HPAGE_SIZE		(1UL << 24)
+#define PAGE_SIZE		sysconf(_SC_PAGESIZE)
+
+static inline u32 pkey_bit_position(int pkey)
+{
+	return (NR_PKEYS - pkey - 1) * PKEY_BITS_PER_PKEY;
+}
+
+static inline u64 __read_pkey_reg(void)
+{
+	u64 pkey_reg;
+
+	asm volatile("mfspr %0, 0xd" : "=r" (pkey_reg));
+
+	return pkey_reg;
+}
+
+static inline void __write_pkey_reg(u64 pkey_reg)
+{
+	u64 amr = pkey_reg;
+
+	dprintf4("%s() changing %016llx to %016llx\n",
+			 __func__, __read_pkey_reg(), pkey_reg);
+
+	asm volatile("isync; mtspr 0xd, %0; isync"
+		     : : "r" ((unsigned long)(amr)) : "memory");
+
+	dprintf4("%s() pkey register after changing %016llx to %016llx\n",
+			__func__, __read_pkey_reg(), pkey_reg);
+}
+
+static inline int cpu_has_pkeys(void)
+{
+	/* No simple way to determine this */
+	return 1;
+}
+
+static inline bool arch_is_powervm()
+{
+	struct stat buf;
+
+	if ((stat("/sys/firmware/devicetree/base/ibm,partition-name", &buf) == 0) &&
+	    (stat("/sys/firmware/devicetree/base/hmc-managed?", &buf) == 0) &&
+	    (stat("/sys/firmware/devicetree/base/chosen/qemu,graphic-width", &buf) == -1) )
+		return true;
+
+	return false;
+}
+
+static inline int get_arch_reserved_keys(void)
+{
+	if (sysconf(_SC_PAGESIZE) == 4096)
+		return NR_RESERVED_PKEYS_4K;
+	else
+		if (arch_is_powervm())
+			return NR_RESERVED_PKEYS_64K_4KEYS;
+		else
+			return NR_RESERVED_PKEYS_64K_3KEYS;
+}
+
+void expect_fault_on_read_execonly_key(void *p1, int pkey)
+{
+	/*
+	 * powerpc does not allow userspace to change permissions of exec-only
+	 * keys since those keys are not allocated by userspace. The signal
+	 * handler wont be able to reset the permissions, which means the code
+	 * will infinitely continue to segfault here.
+	 */
+	return;
+}
+
+/* 4-byte instructions * 16384 = 64K page */
+#define __page_o_noops() asm(".rept 16384 ; nop; .endr")
+
+void *malloc_pkey_with_mprotect_subpage(long size, int prot, u16 pkey)
+{
+	void *ptr;
+	int ret;
+
+	dprintf1("doing %s(size=%ld, prot=0x%x, pkey=%d)\n", __func__,
+			size, prot, pkey);
+	pkey_assert(pkey < NR_PKEYS);
+	ptr = mmap(NULL, size, prot, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
+	pkey_assert(ptr != (void *)-1);
+
+	ret = syscall(__NR_subpage_prot, ptr, size, NULL);
+	if (ret) {
+		perror("subpage_perm");
+		return PTR_ERR_ENOTSUP;
+	}
+
+	ret = mprotect_pkey((void *)ptr, PAGE_SIZE, prot, pkey);
+	pkey_assert(!ret);
+	record_pkey_malloc(ptr, size, prot);
+
+	dprintf1("%s() for pkey %d @ %p\n", __func__, pkey, ptr);
+	return ptr;
+}
+
+#endif /* _PKEYS_POWERPC_H */