The patch titled
Subject: selftests/vm/pkeys: introduce a sub-page allocator
has been added to the -mm tree. Its filename is
selftests-vm-pkeys-introduce-a-sub-page-allocator.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/selftests-vm-pkeys-introduce-a-sub-page-allocator.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/selftests-vm-pkeys-introduce-a-sub-page-allocator.patch
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------------------------------------------------------
From: Ram Pai <linuxram@xxxxxxxxxx>
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/c4a82fa962ec71015b994fab1aaf83bdfd091553.1585646528.git.sandipan@xxxxxxxxxxxxx
Signed-off-by: Ram Pai <linuxram@xxxxxxxxxx>
Signed-off-by: Thiago Jung Bauermann <bauerman@xxxxxxxxxxxxx>
Signed-off-by: Sandipan Das <sandipan@xxxxxxxxxxxxx>
Acked-by: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Florian Weimer <fweimer@xxxxxxxxxx>
Cc: "Desnes A. Nunes do Rosario" <desnesn@xxxxxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Michal Suchanek <msuchanek@xxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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(+)
--- 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
@@ -106,4 +106,29 @@ 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:
_
Patches currently in -mm which might be from linuxram@xxxxxxxxxx are
selftests-x86-pkeys-move-selftests-to-arch-neutral-directory.patch
selftests-vm-pkeys-rename-all-references-to-pkru-to-a-generic-name.patch
selftests-vm-pkeys-move-generic-definitions-to-header-file.patch
selftests-vm-pkeys-fix-pkey_disable_clear.patch
selftests-vm-pkeys-fix-assertion-in-pkey_disable_set-clear.patch
selftests-vm-pkeys-fix-alloc_random_pkey-to-make-it-really-random.patch
selftests-vm-pkeys-introduce-generic-pkey-abstractions.patch
selftests-vm-pkeys-introduce-powerpc-support.patch
selftests-vm-pkeys-fix-assertion-in-test_pkey_alloc_exhaust.patch
selftests-vm-pkeys-improve-checks-to-determine-pkey-support.patch
selftests-vm-pkeys-associate-key-on-a-mapped-page-and-detect-access-violation.patch
selftests-vm-pkeys-associate-key-on-a-mapped-page-and-detect-write-violation.patch
selftests-vm-pkeys-detect-write-violation-on-a-mapped-access-denied-key-page.patch
selftests-vm-pkeys-introduce-a-sub-page-allocator.patch
selftests-vm-pkeys-test-correct-behaviour-of-pkey-0.patch
selftests-vm-pkeys-override-access-right-definitions-on-powerpc.patch
