KVM: selftests: Compile s390 tests with -march=z10

The guest used in s390 kvm selftests is not be set up to handle all
instructions the compiler might emit, i.e. vector instructions, leading
to crashes.
Limit what the compiler emits to the oldest machine model currently
supported by Linux.

Signed-off-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Link: https://lore.kernel.org/r/20230127174552.3370169-1-nsg@linux.ibm.com
Message-Id: <20230127174552.3370169-1-nsg@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>

diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 1750f91dd936291a524cc89859a09ea0c1aea46b..df0989949eb51e11937218c47ee5b6150a1d7914 100644 (file)
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -200,6 +200,9 @@ CFLAGS += -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 \
        -I$(LINUX_TOOL_ARCH_INCLUDE) -I$(LINUX_HDR_PATH) -Iinclude \
        -I$(<D) -Iinclude/$(ARCH_DIR) -I ../rseq -I.. $(EXTRA_CFLAGS) \
        $(KHDR_INCLUDES)
+ifeq ($(ARCH),s390)
+       CFLAGS += -march=z10
+endif
 
 no-pie-option := $(call try-run, echo 'int main(void) { return 0; }' | \
         $(CC) -Werror $(CFLAGS) -no-pie -x c - -o "$$TMP", -no-pie)