| Message ID | 20240819140040.1087552-6-hari55@linux.ibm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | KVM: s390: selftests: Add regression tests for CPU subfunctions | expand |
On Mon Aug 19, 2024 at 3:54 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> > --- > .../kvm/s390x/cpumodel_subfuncs_test.c | 36 ++++++++++++++++++- > 1 file changed, 35 insertions(+), 1 deletion(-) > > diff --git a/tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c b/tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c > index 901c99fe79d9..255984a52365 100644 > --- a/tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c > +++ b/tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c > @@ -20,6 +20,8 @@ > > #include "kvm_util.h" > > +#define U8_MAX ((u8)~0U) > + > /** > * Query available CPU subfunctions > */ > @@ -37,6 +39,33 @@ 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 = (unsigned long)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 <= U8_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 > @@ -235,8 +264,13 @@ struct testdef { > u8 *subfunc_array; > size_t array_size; > testfunc_t test; > - bool facility_bit; > + int facility_bit; Why change that to int here? > } 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 },
diff --git a/tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c b/tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c index 901c99fe79d9..255984a52365 100644 --- a/tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c +++ b/tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c @@ -20,6 +20,8 @@ #include "kvm_util.h" +#define U8_MAX ((u8)~0U) + /** * Query available CPU subfunctions */ @@ -37,6 +39,33 @@ 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 = (unsigned long)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 <= U8_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 @@ -235,8 +264,13 @@ struct testdef { u8 *subfunc_array; size_t array_size; testfunc_t test; - bool facility_bit; + 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 },