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Date: Thu, 14 Apr 2022 14:02:24 +0200
From: Thomas Huth <thuth@...hat.com>
To: Claudio Imbrenda <imbrenda@...ux.ibm.com>
Cc: kvm@...r.kernel.org,
Christian Borntraeger <borntraeger@...ux.ibm.com>,
Janosch Frank <frankja@...ux.ibm.com>,
linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
David Hildenbrand <david@...hat.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Shuah Khan <shuah@...nel.org>,
Janis Schoetterl-Glausch <scgl@...ux.ibm.com>
Subject: Re: [PATCH 2/4] KVM: s390: selftests: Use TAP interface in the
sync_regs test
On 14/04/2022 13.39, Claudio Imbrenda wrote:
> On Thu, 14 Apr 2022 12:53:20 +0200
> Thomas Huth <thuth@...hat.com> wrote:
>
>> The sync_regs test currently does not have any output (unless one
>> of the TEST_ASSERT statement fails), so it's hard to say for a user
>> whether a certain new sub-test has been included in the binary or
>> not. Let's make this a little bit more user-friendly and include
>> some TAP output via the kselftests.h interface.
>> To be able to distinguish the different sub-tests more easily, we
>> also break up the huge main() function here in more fine grained
>> parts.
>>
>> Signed-off-by: Thomas Huth <thuth@...hat.com>
>> ---
>> .../selftests/kvm/s390x/sync_regs_test.c | 86 ++++++++++++++-----
>> 1 file changed, 65 insertions(+), 21 deletions(-)
>>
>> diff --git a/tools/testing/selftests/kvm/s390x/sync_regs_test.c b/tools/testing/selftests/kvm/s390x/sync_regs_test.c
>> index caf7b8859a94..d5ddcbb82d12 100644
>> --- a/tools/testing/selftests/kvm/s390x/sync_regs_test.c
>> +++ b/tools/testing/selftests/kvm/s390x/sync_regs_test.c
>> @@ -21,6 +21,7 @@
>> #include "test_util.h"
>> #include "kvm_util.h"
>> #include "diag318_test_handler.h"
>> +#include "kselftest.h"
>>
>> #define VCPU_ID 5
>>
>> @@ -74,27 +75,9 @@ static void compare_sregs(struct kvm_sregs *left, struct kvm_sync_regs *right)
>> #define TEST_SYNC_FIELDS (KVM_SYNC_GPRS|KVM_SYNC_ACRS|KVM_SYNC_CRS|KVM_SYNC_DIAG318)
>> #define INVALID_SYNC_FIELD 0x80000000
>>
>> -int main(int argc, char *argv[])
>> +void test_read_invalid(struct kvm_vm *vm, struct kvm_run *run)
>> {
>> - struct kvm_vm *vm;
>> - struct kvm_run *run;
>> - struct kvm_regs regs;
>> - struct kvm_sregs sregs;
>> - int rv, cap;
>> -
>> - /* Tell stdout not to buffer its content */
>> - setbuf(stdout, NULL);
>> -
>> - cap = kvm_check_cap(KVM_CAP_SYNC_REGS);
>> - if (!cap) {
>> - print_skip("CAP_SYNC_REGS not supported");
>> - exit(KSFT_SKIP);
>> - }
>> -
>> - /* Create VM */
>> - vm = vm_create_default(VCPU_ID, 0, guest_code);
>> -
>> - run = vcpu_state(vm, VCPU_ID);
>> + int rv;
>>
>> /* Request reading invalid register set from VCPU. */
>> run->kvm_valid_regs = INVALID_SYNC_FIELD;
>> @@ -110,6 +93,11 @@ int main(int argc, char *argv[])
>> "Invalid kvm_valid_regs did not cause expected KVM_RUN error: %d\n",
>> rv);
>> vcpu_state(vm, VCPU_ID)->kvm_valid_regs = 0;
>> +}
>> +
>> +void test_set_invalid(struct kvm_vm *vm, struct kvm_run *run)
>> +{
>> + int rv;
>>
>> /* Request setting invalid register set into VCPU. */
>> run->kvm_dirty_regs = INVALID_SYNC_FIELD;
>> @@ -125,6 +113,13 @@ int main(int argc, char *argv[])
>> "Invalid kvm_dirty_regs did not cause expected KVM_RUN error: %d\n",
>> rv);
>> vcpu_state(vm, VCPU_ID)->kvm_dirty_regs = 0;
>> +}
>> +
>> +void test_req_and_verify_all_valid_regs(struct kvm_vm *vm, struct kvm_run *run)
>> +{
>> + struct kvm_sregs sregs;
>> + struct kvm_regs regs;
>> + int rv;
>>
>> /* Request and verify all valid register sets. */
>> run->kvm_valid_regs = TEST_SYNC_FIELDS;
>> @@ -146,6 +141,13 @@ int main(int argc, char *argv[])
>>
>> vcpu_sregs_get(vm, VCPU_ID, &sregs);
>> compare_sregs(&sregs, &run->s.regs);
>> +}
>> +
>> +void test_set_and_verify_various_reg_values(struct kvm_vm *vm, struct kvm_run *run)
>> +{
>> + struct kvm_sregs sregs;
>> + struct kvm_regs regs;
>> + int rv;
>>
>> /* Set and verify various register values */
>> run->s.regs.gprs[11] = 0xBAD1DEA;
>> @@ -180,6 +182,11 @@ int main(int argc, char *argv[])
>>
>> vcpu_sregs_get(vm, VCPU_ID, &sregs);
>> compare_sregs(&sregs, &run->s.regs);
>> +}
>> +
>> +void test_clear_kvm_dirty_regs_bits(struct kvm_vm *vm, struct kvm_run *run)
>> +{
>> + int rv;
>>
>> /* Clear kvm_dirty_regs bits, verify new s.regs values are
>> * overwritten with existing guest values.
>> @@ -200,8 +207,45 @@ int main(int argc, char *argv[])
>> TEST_ASSERT(run->s.regs.diag318 != 0x4B1D,
>> "diag318 sync regs value incorrect 0x%llx.",
>> run->s.regs.diag318);
>> +}
>> +
>> +struct testdef {
>> + const char *name;
>> + void (*test)(struct kvm_vm *vm, struct kvm_run *run);
>> +} testlist[] = {
>> + { "read invalid", test_read_invalid },
>> + { "set invalid", test_set_invalid },
>> + { "request+verify all valid regs", test_req_and_verify_all_valid_regs },
>> + { "set+verify various regs", test_set_and_verify_various_reg_values },
>> + { "clear kvm_dirty_regs bits", test_clear_kvm_dirty_regs_bits },
>> +};
>> +
>> +int main(int argc, char *argv[])
>> +{
>> + static struct kvm_run *run;
>> + static struct kvm_vm *vm;
>> + int idx;
>> +
>> + /* Tell stdout not to buffer its content */
>> + setbuf(stdout, NULL);
>> +
>> + if (!kvm_check_cap(KVM_CAP_SYNC_REGS))
>> + ksft_exit_skip("CAP_SYNC_REGS not supported");
>
> I'm not an expert on the TAP format, but wouldn't it be more meaningful
> to print the header first? (like you do in the previous patch)
It shouldn't matter much, without the header, TAP version 12 will be used:
https://testanything.org/tap-specification.html
With header, it switches to version 13:
https://testanything.org/tap-version-13-specification.html
But the "1..0" lines (which signal a complete skip) are part of both
versions, so we should be fine here.
(but I can also move it in case I have to respin anyway)
Thomas
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