KVM: s390: selftests: Add regression tests for PFCR subfunctions

Check if the PFCR query reported in userspace coincides with the
kernel reported function list. Right now we don't mask the functions
in the kernel so they have to be the same.

Signed-off-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Reviewed-by: Hariharan Mari <hari55@linux.ibm.com>
Link: https://lore.kernel.org/r/20241107152319.77816-5-brueckner@linux.ibm.com
[frankja@linux.ibm.com: Added commit description]
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Message-ID: <20241107152319.77816-5-brueckner@linux.ibm.com>

diff --git a/tools/arch/s390/include/uapi/asm/kvm.h b/tools/arch/s390/include/uapi/asm/kvm.h
index 05eaf6d..60345dd 100644 (file)
--- a/tools/arch/s390/include/uapi/asm/kvm.h
+++ b/tools/arch/s390/include/uapi/asm/kvm.h
@@ -469,7 +469,8 @@ struct kvm_s390_vm_cpu_subfunc {
        __u8 kdsa[16];          /* with MSA9 */
        __u8 sortl[32];         /* with STFLE.150 */
        __u8 dfltcc[32];        /* with STFLE.151 */
-       __u8 reserved[1728];
+       __u8 pfcr[16];          /* with STFLE.201 */
+       __u8 reserved[1712];
 };
 
 #define KVM_S390_VM_CPU_PROCESSOR_UV_FEAT_GUEST        6

diff --git a/tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c b/tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c
index 222ba1c..2725588 100644 (file)
--- a/tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c
+++ b/tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c
@@ -214,6 +214,19 @@ static void test_dfltcc_asm_block(u8 (*query)[32])
                        : "cc", "0", "1");
 }
 
+/*
+ * Testing Perform Function with Concurrent Results (PFCR)
+ * CPU subfunctions's ASM block
+ */
+static void test_pfcr_asm_block(u8 (*query)[16])
+{
+       asm volatile("  lghi    0,0\n"
+                       "       .insn   rsy,0xeb0000000016,0,0,%[query]\n"
+                       : [query] "=QS" (*query)
+                       :
+                       : "cc", "0");
+}
+
 typedef void (*testfunc_t)(u8 (*array)[]);
 
 struct testdef {
@@ -249,6 +262,8 @@ struct testdef {
        { "SORTL", cpu_subfunc.sortl, sizeof(cpu_subfunc.sortl), test_sortl_asm_block, 150 },
        /* DFLTCC - Facility bit 151 */
        { "DFLTCC", cpu_subfunc.dfltcc, sizeof(cpu_subfunc.dfltcc), test_dfltcc_asm_block, 151 },
+       /* Concurrent-function facility - Facility bit 201 */
+       { "PFCR", cpu_subfunc.pfcr, sizeof(cpu_subfunc.pfcr), test_pfcr_asm_block, 201 },
 };
 
 int main(int argc, char *argv[])