[121/127] selftests/vm/pkeys: introduce a sub-page allocator

Commit Message

Andrew Morton June 4, 2020, 11:52 p.m. UTC

From: Ram Pai <[e-mail]>
Subject: selftests/vm/pkeys: introduce a sub-page allocator

This introduces a new allocator that allocates 4K hardware pages to back
64K linux pages.  This allocator is available only on powerpc.

Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Ram Pai <[e-mail]>
Signed-off-by: Thiago Jung Bauermann <[e-mail]>
Signed-off-by: Sandipan Das <[e-mail]>
Acked-by: Dave Hansen <[e-mail]>
Cc: Dave Hansen <[e-mail]>
Cc: Florian Weimer <[e-mail]>
Cc: "Desnes A. Nunes do Rosario" <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: "Aneesh Kumar K.V" <[e-mail]>
Cc: Michael Ellerman <[e-mail]>
Cc: Michal Hocko <[e-mail]>
Cc: Michal Suchanek <[e-mail]>
Cc: Shuah Khan <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 tools/testing/selftests/vm/pkey-helpers.h    |    6 ++++
 tools/testing/selftests/vm/pkey-powerpc.h    |   25 +++++++++++++++++
 tools/testing/selftests/vm/pkey-x86.h        |    5 +++
 tools/testing/selftests/vm/protection_keys.c |    1 
 4 files changed, 37 insertions(+)

Patch

--- a/tools/testing/selftests/vm/pkey-helpers.h~selftests-vm-pkeys-introduce-a-sub-page-allocator
+++ a/tools/testing/selftests/vm/pkey-helpers.h
@@ -28,6 +28,9 @@ 
 extern int dprint_in_signal;
 extern char dprint_in_signal_buffer[DPRINT_IN_SIGNAL_BUF_SIZE];
 
+extern int test_nr;
+extern int iteration_nr;
+
 #ifdef __GNUC__
 __attribute__((format(printf, 1, 2)))
 #endif
@@ -78,6 +81,9 @@  __attribute__((noinline)) int read_ptr(i
 void expected_pkey_fault(int pkey);
 int sys_pkey_alloc(unsigned long flags, unsigned long init_val);
 int sys_pkey_free(unsigned long pkey);
+int mprotect_pkey(void *ptr, size_t size, unsigned long orig_prot,
+		unsigned long pkey);
+void record_pkey_malloc(void *ptr, long size, int prot);
 
 #if defined(__i386__) || defined(__x86_64__) /* arch */
 #include "pkey-x86.h"
--- a/tools/testing/selftests/vm/pkey-powerpc.h~selftests-vm-pkeys-introduce-a-sub-page-allocator
+++ a/tools/testing/selftests/vm/pkey-powerpc.h
@@ -107,4 +107,29 @@  void expect_fault_on_read_execonly_key(v
 /* 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 */
--- a/tools/testing/selftests/vm/pkey-x86.h~selftests-vm-pkeys-introduce-a-sub-page-allocator
+++ a/tools/testing/selftests/vm/pkey-x86.h
@@ -173,4 +173,9 @@  void expect_fault_on_read_execonly_key(v
 	expected_pkey_fault(pkey);
 }
 
+void *malloc_pkey_with_mprotect_subpage(long size, int prot, u16 pkey)
+{
+	return PTR_ERR_ENOTSUP;
+}
+
 #endif /* _PKEYS_X86_H */
--- a/tools/testing/selftests/vm/protection_keys.c~selftests-vm-pkeys-introduce-a-sub-page-allocator
+++ a/tools/testing/selftests/vm/protection_keys.c
@@ -845,6 +845,7 @@  void *malloc_pkey_mmap_dax(long size, in
 void *(*pkey_malloc[])(long size, int prot, u16 pkey) = {
 
 	malloc_pkey_with_mprotect,
+	malloc_pkey_with_mprotect_subpage,
 	malloc_pkey_anon_huge,
 	malloc_pkey_hugetlb
 /* can not do direct with the pkey_mprotect() API: