introduce a new allocator that allocates 4k hardware-pages to back 64k linux-page. This allocator is only applicable on powerpc.
cc: Dave Hansen dave.hansen@intel.com cc: Florian Weimer fweimer@redhat.com Signed-off-by: Ram Pai linuxram@us.ibm.com Signed-off-by: Thiago Jung Bauermann bauerman@linux.ibm.com --- 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(+), 0 deletions(-)
diff --git a/tools/testing/selftests/vm/pkey-helpers.h b/tools/testing/selftests/vm/pkey-helpers.h index 288ccff..a00eee6 100644 --- a/tools/testing/selftests/vm/pkey-helpers.h +++ b/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 @@ static inline void sigsafe_printf(const char *format, ...) void expected_pkey_fault(int pkey); int sys_pkey_alloc(unsigned long flags, u64 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" diff --git a/tools/testing/selftests/vm/pkey-powerpc.h b/tools/testing/selftests/vm/pkey-powerpc.h index 957f6f6..af44eed 100644 --- a/tools/testing/selftests/vm/pkey-powerpc.h +++ b/tools/testing/selftests/vm/pkey-powerpc.h @@ -98,4 +98,29 @@ void expect_fault_on_read_execonly_key(void *p1, u16 pkey) /* 8-bytes of instruction * 16384bytes = 1 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 */ diff --git a/tools/testing/selftests/vm/pkey-x86.h b/tools/testing/selftests/vm/pkey-x86.h index 6820c10..322da49 100644 --- a/tools/testing/selftests/vm/pkey-x86.h +++ b/tools/testing/selftests/vm/pkey-x86.h @@ -176,4 +176,9 @@ void expect_fault_on_read_execonly_key(void *p1, u16 pkey) expected_pkey_fault(pkey); }
+void *malloc_pkey_with_mprotect_subpage(long size, int prot, u16 pkey) +{ + return PTR_ERR_ENOTSUP; +} + #endif /* _PKEYS_X86_H */ diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c index b5a9e6c..cbd87f8 100644 --- a/tools/testing/selftests/vm/protection_keys.c +++ b/tools/testing/selftests/vm/protection_keys.c @@ -887,6 +887,7 @@ void setup_hugetlbfs(void) 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: