| Message ID | 20240823130947.38323-6-hari55@linux.ibm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | KVM: s390: selftests: Add regression tests for CPU subfunctions | expand |
On Fri Aug 23, 2024 at 3:05 PM CEST, Hariharan Mari wrote: > Extend the existing regression test framework for s390x CPU subfunctions > to include tests for the Perform Locked Operation (PLO) subfunction > functions. > > PLO was introduced in the very first 64-bit machine generation. > Hence it is assumed PLO is always installed in the Z Arch. > The test procedure follows the established pattern. > > Suggested-by: Janosch Frank <frankja@linux.ibm.com> > Signed-off-by: Hariharan Mari <hari55@linux.ibm.com> > Reviewed-by: Janosch Frank <frankja@linux.ibm.com> LGTM Reviewed-by: Christoph Schlameuss <schlameuss@linux.ibm.com> > --- > .../kvm/s390x/cpumodel_subfuncs_test.c | 32 +++++++++++++++++++ > 1 file changed, 32 insertions(+) > > diff --git a/tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c b/tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c > index fe45fb131583..222ba1cc3cac 100644 > --- a/tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c > +++ b/tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c > @@ -19,6 +19,8 @@ > > #include "kvm_util.h" > > +#define PLO_FUNCTION_MAX 256 > + > /* Query available CPU subfunctions */ > struct kvm_s390_vm_cpu_subfunc cpu_subfunc; > > @@ -33,6 +35,31 @@ static void get_cpu_machine_subfuntions(struct kvm_vm *vm, > TEST_ASSERT(!r, "Get cpu subfunctions failed r=%d errno=%d", r, errno); > } > > +static inline int plo_test_bit(unsigned char nr) > +{ > + unsigned long function = nr | 0x100; > + int cc; > + > + asm volatile(" lgr 0,%[function]\n" > + /* Parameter registers are ignored for "test bit" */ > + " plo 0,0,0,0(0)\n" > + " ipm %0\n" > + " srl %0,28\n" > + : "=d" (cc) > + : [function] "d" (function) > + : "cc", "0"); > + return cc == 0; > +} > + > +/* Testing Perform Locked Operation (PLO) CPU subfunction's ASM block */ > +static void test_plo_asm_block(u8 (*query)[32]) > +{ > + for (int i = 0; i < PLO_FUNCTION_MAX; ++i) { > + if (plo_test_bit(i)) > + (*query)[i >> 3] |= 0x80 >> (i & 7); > + } > +} > + > /* Testing Crypto Compute Message Authentication Code (KMAC) CPU subfunction's ASM block */ > static void test_kmac_asm_block(u8 (*query)[16]) > { > @@ -196,6 +223,11 @@ struct testdef { > testfunc_t test; > int facility_bit; > } testlist[] = { > + /* > + * PLO was introduced in the very first 64-bit machine generation. > + * Hence it is assumed PLO is always installed in Z Arch. > + */ > + { "PLO", cpu_subfunc.plo, sizeof(cpu_subfunc.plo), test_plo_asm_block, 1 }, > /* MSA - Facility bit 17 */ > { "KMAC", cpu_subfunc.kmac, sizeof(cpu_subfunc.kmac), test_kmac_asm_block, 17 }, > { "KMC", cpu_subfunc.kmc, sizeof(cpu_subfunc.kmc), test_kmc_asm_block, 17 },
diff --git a/tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c b/tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c index fe45fb131583..222ba1cc3cac 100644 --- a/tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c +++ b/tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c @@ -19,6 +19,8 @@ #include "kvm_util.h" +#define PLO_FUNCTION_MAX 256 + /* Query available CPU subfunctions */ struct kvm_s390_vm_cpu_subfunc cpu_subfunc; @@ -33,6 +35,31 @@ static void get_cpu_machine_subfuntions(struct kvm_vm *vm, TEST_ASSERT(!r, "Get cpu subfunctions failed r=%d errno=%d", r, errno); } +static inline int plo_test_bit(unsigned char nr) +{ + unsigned long function = nr | 0x100; + int cc; + + asm volatile(" lgr 0,%[function]\n" + /* Parameter registers are ignored for "test bit" */ + " plo 0,0,0,0(0)\n" + " ipm %0\n" + " srl %0,28\n" + : "=d" (cc) + : [function] "d" (function) + : "cc", "0"); + return cc == 0; +} + +/* Testing Perform Locked Operation (PLO) CPU subfunction's ASM block */ +static void test_plo_asm_block(u8 (*query)[32]) +{ + for (int i = 0; i < PLO_FUNCTION_MAX; ++i) { + if (plo_test_bit(i)) + (*query)[i >> 3] |= 0x80 >> (i & 7); + } +} + /* Testing Crypto Compute Message Authentication Code (KMAC) CPU subfunction's ASM block */ static void test_kmac_asm_block(u8 (*query)[16]) { @@ -196,6 +223,11 @@ struct testdef { testfunc_t test; int facility_bit; } testlist[] = { + /* + * PLO was introduced in the very first 64-bit machine generation. + * Hence it is assumed PLO is always installed in Z Arch. + */ + { "PLO", cpu_subfunc.plo, sizeof(cpu_subfunc.plo), test_plo_asm_block, 1 }, /* MSA - Facility bit 17 */ { "KMAC", cpu_subfunc.kmac, sizeof(cpu_subfunc.kmac), test_kmac_asm_block, 17 }, { "KMC", cpu_subfunc.kmc, sizeof(cpu_subfunc.kmc), test_kmc_asm_block, 17 },