selftests/powerpc: Add test for real address error handling

Add test for real address or control memory address access
error handling, using NX-GZIP engine.

The error is injected by accessing the control memory address
using illegal instruction, on successful handling the process
attempting to access control memory address using illegal
instruction receives SIGBUS.

Signed-off-by: Ganesh Goudar <ganeshgr@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220107141428.67862-2-ganeshgr@linux.ibm.com

diff --git a/tools/testing/selftests/powerpc/Makefile b/tools/testing/selftests/powerpc/Makefile
index 0830e63..4830372 100644 (file)
--- a/tools/testing/selftests/powerpc/Makefile
+++ b/tools/testing/selftests/powerpc/Makefile
@@ -31,7 +31,8 @@ SUB_DIRS = alignment          \
           vphn         \
           math         \
           ptrace       \
-          security
+          security     \
+          mce
 
 endif
 

diff --git a/tools/testing/selftests/powerpc/mce/Makefile b/tools/testing/selftests/powerpc/mce/Makefile
new file mode 100644 (file)
index 0000000..2424513
--- /dev/null
+++ b/tools/testing/selftests/powerpc/mce/Makefile
@@ -0,0 +1,7 @@
+#SPDX-License-Identifier: GPL-2.0-or-later
+
+TEST_GEN_PROGS := inject-ra-err
+
+include ../../lib.mk
+
+$(TEST_GEN_PROGS): ../harness.c

diff --git a/tools/testing/selftests/powerpc/mce/inject-ra-err.c b/tools/testing/selftests/powerpc/mce/inject-ra-err.c
new file mode 100644 (file)
index 0000000..94323c3
--- /dev/null
+++ b/tools/testing/selftests/powerpc/mce/inject-ra-err.c
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "vas-api.h"
+#include "utils.h"
+
+static bool faulted;
+
+static void sigbus_handler(int n, siginfo_t *info, void *ctxt_v)
+{
+       ucontext_t *ctxt = (ucontext_t *)ctxt_v;
+       struct pt_regs *regs = ctxt->uc_mcontext.regs;
+
+       faulted = true;
+       regs->nip += 4;
+}
+
+static int test_ra_error(void)
+{
+       struct vas_tx_win_open_attr attr;
+       int fd, *paste_addr;
+       char *devname = "/dev/crypto/nx-gzip";
+       struct sigaction act = {
+               .sa_sigaction = sigbus_handler,
+               .sa_flags = SA_SIGINFO,
+       };
+
+       memset(&attr, 0, sizeof(attr));
+       attr.version = 1;
+       attr.vas_id = 0;
+
+       SKIP_IF(access(devname, F_OK));
+
+       fd = open(devname, O_RDWR);
+       FAIL_IF(fd < 0);
+       FAIL_IF(ioctl(fd, VAS_TX_WIN_OPEN, &attr) < 0);
+       FAIL_IF(sigaction(SIGBUS, &act, NULL) != 0);
+
+       paste_addr = mmap(NULL, 4096, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0ULL);
+
+       /* The following assignment triggers exception */
+       mb();
+       *paste_addr = 1;
+       mb();
+
+       FAIL_IF(!faulted);
+
+       return 0;
+}
+
+int main(void)
+{
+       return test_harness(test_ra_error, "inject-ra-err");
+}
+

diff --git a/tools/testing/selftests/powerpc/mce/vas-api.h b/tools/testing/selftests/powerpc/mce/vas-api.h
new file mode 120000 (symlink)
index 0000000..1455c1b
--- /dev/null
+++ b/tools/testing/selftests/powerpc/mce/vas-api.h
@@ -0,0 +1 @@
+../../../../../arch/powerpc/include/uapi/asm/vas-api.h
\ No newline at end of file