diff mbox series

[v3] self_tests/kvm: sync_regs test for diag318

Message ID 20201203215212.243145-1-walling@linux.ibm.com
State Superseded
Headers show
Series [v3] self_tests/kvm: sync_regs test for diag318 | expand

Commit Message

Collin Walling Dec. 3, 2020, 9:52 p.m. UTC
The DIAGNOSE 0x0318 instruction, unique to s390x, is a privileged call
that must be intercepted via SIE, handled in userspace, and the
information set by the instruction is communicated back to KVM.

To test the instruction interception, an ad-hoc handler is defined which
simply has a VM execute the instruction and then userspace will extract
the necessary info. The handler is defined such that the instruction
invocation occurs only once. It is up to the caller to determine how the
info returned by this handler should be used.

The diag318 info is communicated from userspace to KVM via a sync_regs
call. This is tested during a sync_regs test, where the diag318 info is
requested via the handler, then the info is stored in the appropriate
register in KVM via a sync registers call.

If KVM does not support diag318, then the tests will print a message
stating that diag318 was skipped, and the asserts will simply test
against a value of 0.

Signed-off-by: Collin Walling <walling@linux.ibm.com>
---

v3 changes: no longer testing the reset code, as it is handled
entirely via userspace. The respective reset tests have been removed

---
 tools/testing/selftests/kvm/Makefile          |  2 +-
 .../kvm/include/s390x/diag318_test_handler.h  | 13 +++
 .../kvm/lib/s390x/diag318_test_handler.c      | 82 +++++++++++++++++++
 tools/testing/selftests/kvm/s390x/resets.c    |  1 +
 .../selftests/kvm/s390x/sync_regs_test.c      | 16 +++-
 5 files changed, 112 insertions(+), 2 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/include/s390x/diag318_test_handler.h
 create mode 100644 tools/testing/selftests/kvm/lib/s390x/diag318_test_handler.c

Comments

Janosch Frank Dec. 7, 2020, 8:16 a.m. UTC | #1
On 12/3/20 10:52 PM, Collin Walling wrote:
> The DIAGNOSE 0x0318 instruction, unique to s390x, is a privileged call


s/call/instruction/

> that must be intercepted via SIE, handled in userspace, and the

> information set by the instruction is communicated back to KVM.

> 

> To test the instruction interception, an ad-hoc handler is defined which

> simply has a VM execute the instruction and then userspace will extract

> the necessary info. The handler is defined such that the instruction

> invocation occurs only once. It is up to the caller to determine how the

> info returned by this handler should be used.

> 

> The diag318 info is communicated from userspace to KVM via a sync_regs

> call. This is tested during a sync_regs test, where the diag318 info is

> requested via the handler, then the info is stored in the appropriate

> register in KVM via a sync registers call.

> 

> If KVM does not support diag318, then the tests will print a message

> stating that diag318 was skipped, and the asserts will simply test

> against a value of 0.

> 

> Signed-off-by: Collin Walling <walling@linux.ibm.com>


Acked-by: Janosch Frank <frankja@linux.ibm.com>


Some nits below.

> ---

> 

> v3 changes: no longer testing the reset code, as it is handled

> entirely via userspace. The respective reset tests have been removed

> 

> ---

>  tools/testing/selftests/kvm/Makefile          |  2 +-

>  .../kvm/include/s390x/diag318_test_handler.h  | 13 +++

>  .../kvm/lib/s390x/diag318_test_handler.c      | 82 +++++++++++++++++++

>  tools/testing/selftests/kvm/s390x/resets.c    |  1 +

>  .../selftests/kvm/s390x/sync_regs_test.c      | 16 +++-

>  5 files changed, 112 insertions(+), 2 deletions(-)

>  create mode 100644 tools/testing/selftests/kvm/include/s390x/diag318_test_handler.h

>  create mode 100644 tools/testing/selftests/kvm/lib/s390x/diag318_test_handler.c

> 

> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile

> index 3d14ef77755e..426c78449044 100644

> --- a/tools/testing/selftests/kvm/Makefile

> +++ b/tools/testing/selftests/kvm/Makefile

> @@ -36,7 +36,7 @@ endif

>  LIBKVM = lib/assert.c lib/elf.c lib/io.c lib/kvm_util.c lib/sparsebit.c lib/test_util.c

>  LIBKVM_x86_64 = lib/x86_64/processor.c lib/x86_64/vmx.c lib/x86_64/svm.c lib/x86_64/ucall.c lib/x86_64/handlers.S

>  LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c

> -LIBKVM_s390x = lib/s390x/processor.c lib/s390x/ucall.c

> +LIBKVM_s390x = lib/s390x/processor.c lib/s390x/ucall.c lib/s390x/diag318_test_handler.c

>  

>  TEST_GEN_PROGS_x86_64 = x86_64/cr4_cpuid_sync_test

>  TEST_GEN_PROGS_x86_64 += x86_64/evmcs_test

> diff --git a/tools/testing/selftests/kvm/include/s390x/diag318_test_handler.h b/tools/testing/selftests/kvm/include/s390x/diag318_test_handler.h

> new file mode 100644

> index 000000000000..b0ed71302722

> --- /dev/null

> +++ b/tools/testing/selftests/kvm/include/s390x/diag318_test_handler.h

> @@ -0,0 +1,13 @@

> +/* SPDX-License-Identifier: GPL-2.0-or-later

> + *

> + * Test handler for the s390x DIAGNOSE 0x0318 instruction.

> + *

> + * Copyright (C) 2020, IBM

> + */

> +

> +#ifndef SELFTEST_KVM_DIAG318_TEST_HANDLER

> +#define SELFTEST_KVM_DIAG318_TEST_HANDLER

> +

> +uint64_t get_diag318_info(void);

> +

> +#endif

> diff --git a/tools/testing/selftests/kvm/lib/s390x/diag318_test_handler.c b/tools/testing/selftests/kvm/lib/s390x/diag318_test_handler.c

> new file mode 100644

> index 000000000000..1e0b766efeb7

> --- /dev/null

> +++ b/tools/testing/selftests/kvm/lib/s390x/diag318_test_handler.c

> @@ -0,0 +1,82 @@

> +// SPDX-License-Identifier: GPL-2.0-or-later

> +/*

> + * Test handler for the s390x DIAGNOSE 0x0318 instruction.

> + *

> + * Copyright (C) 2020, IBM

> + */

> +

> +#include "test_util.h"

> +#include "kvm_util.h"

> +

> +#define VCPU_ID	5


The sync_regs test has the same ID, will this be a problem?

> +

> +#define ICPT_INSTRUCTION	0x04

> +#define IPA0_DIAG		0x8300

> +

> +static void guest_code(void)

> +{

> +	uint64_t diag318_info = 0x12345678;

> +

> +	asm volatile ("diag %0,0,0x318\n" : : "d" (diag318_info));

> +}

> +

> +/*

> + * The DIAGNOSE 0x0318 instruction call must be handled via userspace. As such,

> + * we create an ad-hoc VM here to handle the instruction then extract the

> + * necessary data. It is up to the caller to decide what to do with that data.

> + */

> +static uint64_t diag318_handler(void)

> +{

> +	struct kvm_vm *vm;

> +	struct kvm_run *run;

> +	uint64_t reg;

> +	uint64_t diag318_info;

> +

> +	vm = vm_create_default(VCPU_ID, 0, guest_code);

> +	vcpu_run(vm, VCPU_ID);

> +	run = vcpu_state(vm, VCPU_ID);

> +

> +	TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC,

> +		    "DIAGNOSE 0x0318 instruction was not intercepted");

> +	TEST_ASSERT(run->s390_sieic.icptcode == ICPT_INSTRUCTION,

> +		    "Unexpected intercept code: 0x%x", run->s390_sieic.icptcode);

> +	TEST_ASSERT((run->s390_sieic.ipa & 0xff00) == IPA0_DIAG,

> +		    "Unexpected IPA0 code: 0x%x", (run->s390_sieic.ipa & 0xff00));

> +

> +	reg = (run->s390_sieic.ipa & 0x00f0) >> 4;

> +	diag318_info = run->s.regs.gprs[reg];

> +

> +	TEST_ASSERT(diag318_info != 0, "DIAGNOSE 0x0318 info not set");

> +

> +	kvm_vm_free(vm);

> +

> +	return diag318_info;

> +}

> +

> +uint64_t get_diag318_info(void)

> +{

> +	static uint64_t diag318_info;

> +	static bool printed_skip;

> +

> +	/*

> +	 * If KVM does not support diag318, then return 0 to

> +	 * ensure tests do not break.

> +	 */

> +	if (!kvm_check_cap(KVM_CAP_S390_DIAG318)) {

> +		if (!printed_skip) {

> +			fprintf(stdout, "KVM_CAP_S390_DIAG318 not supported. "

> +				"Skipping diag318 test.\n");

> +			printed_skip = true;

> +		}

> +		return 0;

> +	}

> +

> +	/*

> +	 * If a test has previously requested the diag318 info,

> +	 * then don't bother spinning up a temporary VM again.

> +	 */

> +	if (!diag318_info)

> +		diag318_info = diag318_handler();

> +

> +	return diag318_info;

> +}

> diff --git a/tools/testing/selftests/kvm/s390x/resets.c b/tools/testing/selftests/kvm/s390x/resets.c

> index b143db6d8693..b3d7d4ac2d54 100644

> --- a/tools/testing/selftests/kvm/s390x/resets.c

> +++ b/tools/testing/selftests/kvm/s390x/resets.c

> @@ -110,6 +110,7 @@ static void assert_clear(void)

>  

>  	TEST_ASSERT(!memcmp(sync_regs->vrs, regs_null, sizeof(sync_regs->vrs)),

>  		    "vrs0-15 == 0 (sync_regs)");

> +


Whitespace damage

>  }

>  

>  static void assert_initial_noclear(void)

> diff --git a/tools/testing/selftests/kvm/s390x/sync_regs_test.c b/tools/testing/selftests/kvm/s390x/sync_regs_test.c

> index 5731ccf34917..caf7b8859a94 100644

> --- a/tools/testing/selftests/kvm/s390x/sync_regs_test.c

> +++ b/tools/testing/selftests/kvm/s390x/sync_regs_test.c

> @@ -20,6 +20,7 @@

>  

>  #include "test_util.h"

>  #include "kvm_util.h"

> +#include "diag318_test_handler.h"

>  

>  #define VCPU_ID 5

>  

> @@ -70,7 +71,7 @@ static void compare_sregs(struct kvm_sregs *left, struct kvm_sync_regs *right)

>  

>  #undef REG_COMPARE

>  

> -#define TEST_SYNC_FIELDS   (KVM_SYNC_GPRS|KVM_SYNC_ACRS|KVM_SYNC_CRS)

> +#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[])

> @@ -152,6 +153,12 @@ int main(int argc, char *argv[])

>  

>  	run->kvm_valid_regs = TEST_SYNC_FIELDS;

>  	run->kvm_dirty_regs = KVM_SYNC_GPRS | KVM_SYNC_ACRS;

> +

> +	if (get_diag318_info() > 0) {

> +		run->s.regs.diag318 = get_diag318_info();

> +		run->kvm_dirty_regs |= KVM_SYNC_DIAG318;

> +	}

> +

>  	rv = _vcpu_run(vm, VCPU_ID);

>  	TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv);

>  	TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC,

> @@ -164,6 +171,9 @@ int main(int argc, char *argv[])

>  	TEST_ASSERT(run->s.regs.acrs[0]  == 1 << 11,

>  		    "acr0 sync regs value incorrect 0x%x.",

>  		    run->s.regs.acrs[0]);

> +	TEST_ASSERT(run->s.regs.diag318 == get_diag318_info(),

> +		    "diag318 sync regs value incorrect 0x%llx.",

> +		    run->s.regs.diag318);

>  

>  	vcpu_regs_get(vm, VCPU_ID, &regs);

>  	compare_regs(&regs, &run->s.regs);

> @@ -177,6 +187,7 @@ int main(int argc, char *argv[])

>  	run->kvm_valid_regs = TEST_SYNC_FIELDS;

>  	run->kvm_dirty_regs = 0;

>  	run->s.regs.gprs[11] = 0xDEADBEEF;

> +	run->s.regs.diag318 = 0x4B1D;

>  	rv = _vcpu_run(vm, VCPU_ID);

>  	TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv);

>  	TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC,

> @@ -186,6 +197,9 @@ int main(int argc, char *argv[])

>  	TEST_ASSERT(run->s.regs.gprs[11] != 0xDEADBEEF,

>  		    "r11 sync regs value incorrect 0x%llx.",

>  		    run->s.regs.gprs[11]);

> +	TEST_ASSERT(run->s.regs.diag318 != 0x4B1D,

> +		    "diag318 sync regs value incorrect 0x%llx.",

> +		    run->s.regs.diag318);

>  

>  	kvm_vm_free(vm);

>  

>
Christian Borntraeger Dec. 7, 2020, 8:19 a.m. UTC | #2
On 07.12.20 09:16, Janosch Frank wrote:
> On 12/3/20 10:52 PM, Collin Walling wrote:

>> The DIAGNOSE 0x0318 instruction, unique to s390x, is a privileged call

> 

> s/call/instruction/

> 

>> that must be intercepted via SIE, handled in userspace, and the

>> information set by the instruction is communicated back to KVM.

>>

>> To test the instruction interception, an ad-hoc handler is defined which

>> simply has a VM execute the instruction and then userspace will extract

>> the necessary info. The handler is defined such that the instruction

>> invocation occurs only once. It is up to the caller to determine how the

>> info returned by this handler should be used.

>>

>> The diag318 info is communicated from userspace to KVM via a sync_regs

>> call. This is tested during a sync_regs test, where the diag318 info is

>> requested via the handler, then the info is stored in the appropriate

>> register in KVM via a sync registers call.

>>

>> If KVM does not support diag318, then the tests will print a message

>> stating that diag318 was skipped, and the asserts will simply test

>> against a value of 0.

>>

>> Signed-off-by: Collin Walling <walling@linux.ibm.com>

> 

> Acked-by: Janosch Frank <frankja@linux.ibm.com>

> 

> Some nits below.


Collin, can you have a look at the nits and resubmit soon? Then I can pick this
for 5.11.

> 

>> ---

>>

>> v3 changes: no longer testing the reset code, as it is handled

>> entirely via userspace. The respective reset tests have been removed

>>

>> ---

>>  tools/testing/selftests/kvm/Makefile          |  2 +-

>>  .../kvm/include/s390x/diag318_test_handler.h  | 13 +++

>>  .../kvm/lib/s390x/diag318_test_handler.c      | 82 +++++++++++++++++++

>>  tools/testing/selftests/kvm/s390x/resets.c    |  1 +

>>  .../selftests/kvm/s390x/sync_regs_test.c      | 16 +++-

>>  5 files changed, 112 insertions(+), 2 deletions(-)

>>  create mode 100644 tools/testing/selftests/kvm/include/s390x/diag318_test_handler.h

>>  create mode 100644 tools/testing/selftests/kvm/lib/s390x/diag318_test_handler.c

>>

>> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile

>> index 3d14ef77755e..426c78449044 100644

>> --- a/tools/testing/selftests/kvm/Makefile

>> +++ b/tools/testing/selftests/kvm/Makefile

>> @@ -36,7 +36,7 @@ endif

>>  LIBKVM = lib/assert.c lib/elf.c lib/io.c lib/kvm_util.c lib/sparsebit.c lib/test_util.c

>>  LIBKVM_x86_64 = lib/x86_64/processor.c lib/x86_64/vmx.c lib/x86_64/svm.c lib/x86_64/ucall.c lib/x86_64/handlers.S

>>  LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c

>> -LIBKVM_s390x = lib/s390x/processor.c lib/s390x/ucall.c

>> +LIBKVM_s390x = lib/s390x/processor.c lib/s390x/ucall.c lib/s390x/diag318_test_handler.c

>>  

>>  TEST_GEN_PROGS_x86_64 = x86_64/cr4_cpuid_sync_test

>>  TEST_GEN_PROGS_x86_64 += x86_64/evmcs_test

>> diff --git a/tools/testing/selftests/kvm/include/s390x/diag318_test_handler.h b/tools/testing/selftests/kvm/include/s390x/diag318_test_handler.h

>> new file mode 100644

>> index 000000000000..b0ed71302722

>> --- /dev/null

>> +++ b/tools/testing/selftests/kvm/include/s390x/diag318_test_handler.h

>> @@ -0,0 +1,13 @@

>> +/* SPDX-License-Identifier: GPL-2.0-or-later

>> + *

>> + * Test handler for the s390x DIAGNOSE 0x0318 instruction.

>> + *

>> + * Copyright (C) 2020, IBM

>> + */

>> +

>> +#ifndef SELFTEST_KVM_DIAG318_TEST_HANDLER

>> +#define SELFTEST_KVM_DIAG318_TEST_HANDLER

>> +

>> +uint64_t get_diag318_info(void);

>> +

>> +#endif

>> diff --git a/tools/testing/selftests/kvm/lib/s390x/diag318_test_handler.c b/tools/testing/selftests/kvm/lib/s390x/diag318_test_handler.c

>> new file mode 100644

>> index 000000000000..1e0b766efeb7

>> --- /dev/null

>> +++ b/tools/testing/selftests/kvm/lib/s390x/diag318_test_handler.c

>> @@ -0,0 +1,82 @@

>> +// SPDX-License-Identifier: GPL-2.0-or-later

>> +/*

>> + * Test handler for the s390x DIAGNOSE 0x0318 instruction.

>> + *

>> + * Copyright (C) 2020, IBM

>> + */

>> +

>> +#include "test_util.h"

>> +#include "kvm_util.h"

>> +

>> +#define VCPU_ID	5

> 

> The sync_regs test has the same ID, will this be a problem?

> 

>> +

>> +#define ICPT_INSTRUCTION	0x04

>> +#define IPA0_DIAG		0x8300

>> +

>> +static void guest_code(void)

>> +{

>> +	uint64_t diag318_info = 0x12345678;

>> +

>> +	asm volatile ("diag %0,0,0x318\n" : : "d" (diag318_info));

>> +}

>> +

>> +/*

>> + * The DIAGNOSE 0x0318 instruction call must be handled via userspace. As such,

>> + * we create an ad-hoc VM here to handle the instruction then extract the

>> + * necessary data. It is up to the caller to decide what to do with that data.

>> + */

>> +static uint64_t diag318_handler(void)

>> +{

>> +	struct kvm_vm *vm;

>> +	struct kvm_run *run;

>> +	uint64_t reg;

>> +	uint64_t diag318_info;

>> +

>> +	vm = vm_create_default(VCPU_ID, 0, guest_code);

>> +	vcpu_run(vm, VCPU_ID);

>> +	run = vcpu_state(vm, VCPU_ID);

>> +

>> +	TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC,

>> +		    "DIAGNOSE 0x0318 instruction was not intercepted");

>> +	TEST_ASSERT(run->s390_sieic.icptcode == ICPT_INSTRUCTION,

>> +		    "Unexpected intercept code: 0x%x", run->s390_sieic.icptcode);

>> +	TEST_ASSERT((run->s390_sieic.ipa & 0xff00) == IPA0_DIAG,

>> +		    "Unexpected IPA0 code: 0x%x", (run->s390_sieic.ipa & 0xff00));

>> +

>> +	reg = (run->s390_sieic.ipa & 0x00f0) >> 4;

>> +	diag318_info = run->s.regs.gprs[reg];

>> +

>> +	TEST_ASSERT(diag318_info != 0, "DIAGNOSE 0x0318 info not set");

>> +

>> +	kvm_vm_free(vm);

>> +

>> +	return diag318_info;

>> +}

>> +

>> +uint64_t get_diag318_info(void)

>> +{

>> +	static uint64_t diag318_info;

>> +	static bool printed_skip;

>> +

>> +	/*

>> +	 * If KVM does not support diag318, then return 0 to

>> +	 * ensure tests do not break.

>> +	 */

>> +	if (!kvm_check_cap(KVM_CAP_S390_DIAG318)) {

>> +		if (!printed_skip) {

>> +			fprintf(stdout, "KVM_CAP_S390_DIAG318 not supported. "

>> +				"Skipping diag318 test.\n");

>> +			printed_skip = true;

>> +		}

>> +		return 0;

>> +	}

>> +

>> +	/*

>> +	 * If a test has previously requested the diag318 info,

>> +	 * then don't bother spinning up a temporary VM again.

>> +	 */

>> +	if (!diag318_info)

>> +		diag318_info = diag318_handler();

>> +

>> +	return diag318_info;

>> +}

>> diff --git a/tools/testing/selftests/kvm/s390x/resets.c b/tools/testing/selftests/kvm/s390x/resets.c

>> index b143db6d8693..b3d7d4ac2d54 100644

>> --- a/tools/testing/selftests/kvm/s390x/resets.c

>> +++ b/tools/testing/selftests/kvm/s390x/resets.c

>> @@ -110,6 +110,7 @@ static void assert_clear(void)

>>  

>>  	TEST_ASSERT(!memcmp(sync_regs->vrs, regs_null, sizeof(sync_regs->vrs)),

>>  		    "vrs0-15 == 0 (sync_regs)");

>> +

> 

> Whitespace damage

> 

>>  }

>>  

>>  static void assert_initial_noclear(void)

>> diff --git a/tools/testing/selftests/kvm/s390x/sync_regs_test.c b/tools/testing/selftests/kvm/s390x/sync_regs_test.c

>> index 5731ccf34917..caf7b8859a94 100644

>> --- a/tools/testing/selftests/kvm/s390x/sync_regs_test.c

>> +++ b/tools/testing/selftests/kvm/s390x/sync_regs_test.c

>> @@ -20,6 +20,7 @@

>>  

>>  #include "test_util.h"

>>  #include "kvm_util.h"

>> +#include "diag318_test_handler.h"

>>  

>>  #define VCPU_ID 5

>>  

>> @@ -70,7 +71,7 @@ static void compare_sregs(struct kvm_sregs *left, struct kvm_sync_regs *right)

>>  

>>  #undef REG_COMPARE

>>  

>> -#define TEST_SYNC_FIELDS   (KVM_SYNC_GPRS|KVM_SYNC_ACRS|KVM_SYNC_CRS)

>> +#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[])

>> @@ -152,6 +153,12 @@ int main(int argc, char *argv[])

>>  

>>  	run->kvm_valid_regs = TEST_SYNC_FIELDS;

>>  	run->kvm_dirty_regs = KVM_SYNC_GPRS | KVM_SYNC_ACRS;

>> +

>> +	if (get_diag318_info() > 0) {

>> +		run->s.regs.diag318 = get_diag318_info();

>> +		run->kvm_dirty_regs |= KVM_SYNC_DIAG318;

>> +	}

>> +

>>  	rv = _vcpu_run(vm, VCPU_ID);

>>  	TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv);

>>  	TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC,

>> @@ -164,6 +171,9 @@ int main(int argc, char *argv[])

>>  	TEST_ASSERT(run->s.regs.acrs[0]  == 1 << 11,

>>  		    "acr0 sync regs value incorrect 0x%x.",

>>  		    run->s.regs.acrs[0]);

>> +	TEST_ASSERT(run->s.regs.diag318 == get_diag318_info(),

>> +		    "diag318 sync regs value incorrect 0x%llx.",

>> +		    run->s.regs.diag318);

>>  

>>  	vcpu_regs_get(vm, VCPU_ID, &regs);

>>  	compare_regs(&regs, &run->s.regs);

>> @@ -177,6 +187,7 @@ int main(int argc, char *argv[])

>>  	run->kvm_valid_regs = TEST_SYNC_FIELDS;

>>  	run->kvm_dirty_regs = 0;

>>  	run->s.regs.gprs[11] = 0xDEADBEEF;

>> +	run->s.regs.diag318 = 0x4B1D;

>>  	rv = _vcpu_run(vm, VCPU_ID);

>>  	TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv);

>>  	TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC,

>> @@ -186,6 +197,9 @@ int main(int argc, char *argv[])

>>  	TEST_ASSERT(run->s.regs.gprs[11] != 0xDEADBEEF,

>>  		    "r11 sync regs value incorrect 0x%llx.",

>>  		    run->s.regs.gprs[11]);

>> +	TEST_ASSERT(run->s.regs.diag318 != 0x4B1D,

>> +		    "diag318 sync regs value incorrect 0x%llx.",

>> +		    run->s.regs.diag318);

>>  

>>  	kvm_vm_free(vm);

>>  

>>

>
Collin Walling Dec. 7, 2020, 3:26 p.m. UTC | #3
On 12/7/20 3:16 AM, Janosch Frank wrote:
> On 12/3/20 10:52 PM, Collin Walling wrote:

>> The DIAGNOSE 0x0318 instruction, unique to s390x, is a privileged call

> 

> s/call/instruction/

> 

>> that must be intercepted via SIE, handled in userspace, and the

>> information set by the instruction is communicated back to KVM.

>>

>> To test the instruction interception, an ad-hoc handler is defined which

>> simply has a VM execute the instruction and then userspace will extract

>> the necessary info. The handler is defined such that the instruction

>> invocation occurs only once. It is up to the caller to determine how the

>> info returned by this handler should be used.

>>

>> The diag318 info is communicated from userspace to KVM via a sync_regs

>> call. This is tested during a sync_regs test, where the diag318 info is

>> requested via the handler, then the info is stored in the appropriate

>> register in KVM via a sync registers call.

>>

>> If KVM does not support diag318, then the tests will print a message

>> stating that diag318 was skipped, and the asserts will simply test

>> against a value of 0.

>>

>> Signed-off-by: Collin Walling <walling@linux.ibm.com>

> 

> Acked-by: Janosch Frank <frankja@linux.ibm.com>

> 

> Some nits below.

> 

>> ---

>>

>> v3 changes: no longer testing the reset code, as it is handled

>> entirely via userspace. The respective reset tests have been removed

>>

>> ---

>>  tools/testing/selftests/kvm/Makefile          |  2 +-

>>  .../kvm/include/s390x/diag318_test_handler.h  | 13 +++

>>  .../kvm/lib/s390x/diag318_test_handler.c      | 82 +++++++++++++++++++

>>  tools/testing/selftests/kvm/s390x/resets.c    |  1 +

>>  .../selftests/kvm/s390x/sync_regs_test.c      | 16 +++-

>>  5 files changed, 112 insertions(+), 2 deletions(-)

>>  create mode 100644 tools/testing/selftests/kvm/include/s390x/diag318_test_handler.h

>>  create mode 100644 tools/testing/selftests/kvm/lib/s390x/diag318_test_handler.c

>>

>> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile

>> index 3d14ef77755e..426c78449044 100644

>> --- a/tools/testing/selftests/kvm/Makefile

>> +++ b/tools/testing/selftests/kvm/Makefile

>> @@ -36,7 +36,7 @@ endif

>>  LIBKVM = lib/assert.c lib/elf.c lib/io.c lib/kvm_util.c lib/sparsebit.c lib/test_util.c

>>  LIBKVM_x86_64 = lib/x86_64/processor.c lib/x86_64/vmx.c lib/x86_64/svm.c lib/x86_64/ucall.c lib/x86_64/handlers.S

>>  LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c

>> -LIBKVM_s390x = lib/s390x/processor.c lib/s390x/ucall.c

>> +LIBKVM_s390x = lib/s390x/processor.c lib/s390x/ucall.c lib/s390x/diag318_test_handler.c

>>  

>>  TEST_GEN_PROGS_x86_64 = x86_64/cr4_cpuid_sync_test

>>  TEST_GEN_PROGS_x86_64 += x86_64/evmcs_test

>> diff --git a/tools/testing/selftests/kvm/include/s390x/diag318_test_handler.h b/tools/testing/selftests/kvm/include/s390x/diag318_test_handler.h

>> new file mode 100644

>> index 000000000000..b0ed71302722

>> --- /dev/null

>> +++ b/tools/testing/selftests/kvm/include/s390x/diag318_test_handler.h

>> @@ -0,0 +1,13 @@

>> +/* SPDX-License-Identifier: GPL-2.0-or-later

>> + *

>> + * Test handler for the s390x DIAGNOSE 0x0318 instruction.

>> + *

>> + * Copyright (C) 2020, IBM

>> + */

>> +

>> +#ifndef SELFTEST_KVM_DIAG318_TEST_HANDLER

>> +#define SELFTEST_KVM_DIAG318_TEST_HANDLER

>> +

>> +uint64_t get_diag318_info(void);

>> +

>> +#endif

>> diff --git a/tools/testing/selftests/kvm/lib/s390x/diag318_test_handler.c b/tools/testing/selftests/kvm/lib/s390x/diag318_test_handler.c

>> new file mode 100644

>> index 000000000000..1e0b766efeb7

>> --- /dev/null

>> +++ b/tools/testing/selftests/kvm/lib/s390x/diag318_test_handler.c

>> @@ -0,0 +1,82 @@

>> +// SPDX-License-Identifier: GPL-2.0-or-later

>> +/*

>> + * Test handler for the s390x DIAGNOSE 0x0318 instruction.

>> + *

>> + * Copyright (C) 2020, IBM

>> + */

>> +

>> +#include "test_util.h"

>> +#include "kvm_util.h"

>> +

>> +#define VCPU_ID	5

> 

> The sync_regs test has the same ID, will this be a problem?

> 


I'm unsure of any complications that may rise from two VCPU_IDs being
used at the same time. I had thought they were rather arbitrary and
mattered only on a per-VM caes (the diag318 handler and sync_regs tests
operate on separate VM instances).

But since I have to resubmit and better safe-than-sorry, I can increment
this by 1.

>> +

>> +#define ICPT_INSTRUCTION	0x04

>> +#define IPA0_DIAG		0x8300

>> +

>> +static void guest_code(void)

>> +{

>> +	uint64_t diag318_info = 0x12345678;

>> +

>> +	asm volatile ("diag %0,0,0x318\n" : : "d" (diag318_info));

>> +}

>> +

>> +/*

>> + * The DIAGNOSE 0x0318 instruction call must be handled via userspace. As such,

>> + * we create an ad-hoc VM here to handle the instruction then extract the

>> + * necessary data. It is up to the caller to decide what to do with that data.

>> + */

>> +static uint64_t diag318_handler(void)

>> +{

>> +	struct kvm_vm *vm;

>> +	struct kvm_run *run;

>> +	uint64_t reg;

>> +	uint64_t diag318_info;

>> +

>> +	vm = vm_create_default(VCPU_ID, 0, guest_code);

>> +	vcpu_run(vm, VCPU_ID);

>> +	run = vcpu_state(vm, VCPU_ID);

>> +

>> +	TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC,

>> +		    "DIAGNOSE 0x0318 instruction was not intercepted");

>> +	TEST_ASSERT(run->s390_sieic.icptcode == ICPT_INSTRUCTION,

>> +		    "Unexpected intercept code: 0x%x", run->s390_sieic.icptcode);

>> +	TEST_ASSERT((run->s390_sieic.ipa & 0xff00) == IPA0_DIAG,

>> +		    "Unexpected IPA0 code: 0x%x", (run->s390_sieic.ipa & 0xff00));

>> +

>> +	reg = (run->s390_sieic.ipa & 0x00f0) >> 4;

>> +	diag318_info = run->s.regs.gprs[reg];

>> +

>> +	TEST_ASSERT(diag318_info != 0, "DIAGNOSE 0x0318 info not set");

>> +

>> +	kvm_vm_free(vm);

>> +

>> +	return diag318_info;

>> +}

>> +

>> +uint64_t get_diag318_info(void)

>> +{

>> +	static uint64_t diag318_info;

>> +	static bool printed_skip;

>> +

>> +	/*

>> +	 * If KVM does not support diag318, then return 0 to

>> +	 * ensure tests do not break.

>> +	 */

>> +	if (!kvm_check_cap(KVM_CAP_S390_DIAG318)) {

>> +		if (!printed_skip) {

>> +			fprintf(stdout, "KVM_CAP_S390_DIAG318 not supported. "

>> +				"Skipping diag318 test.\n");

>> +			printed_skip = true;

>> +		}

>> +		return 0;

>> +	}

>> +

>> +	/*

>> +	 * If a test has previously requested the diag318 info,

>> +	 * then don't bother spinning up a temporary VM again.

>> +	 */

>> +	if (!diag318_info)

>> +		diag318_info = diag318_handler();

>> +

>> +	return diag318_info;

>> +}

>> diff --git a/tools/testing/selftests/kvm/s390x/resets.c b/tools/testing/selftests/kvm/s390x/resets.c

>> index b143db6d8693..b3d7d4ac2d54 100644

>> --- a/tools/testing/selftests/kvm/s390x/resets.c

>> +++ b/tools/testing/selftests/kvm/s390x/resets.c

>> @@ -110,6 +110,7 @@ static void assert_clear(void)

>>  

>>  	TEST_ASSERT(!memcmp(sync_regs->vrs, regs_null, sizeof(sync_regs->vrs)),

>>  		    "vrs0-15 == 0 (sync_regs)");

>> +

> 

> Whitespace damage


Good catch

> 

>>  }

>>  

>>  static void assert_initial_noclear(void)

>> diff --git a/tools/testing/selftests/kvm/s390x/sync_regs_test.c b/tools/testing/selftests/kvm/s390x/sync_regs_test.c

>> index 5731ccf34917..caf7b8859a94 100644

>> --- a/tools/testing/selftests/kvm/s390x/sync_regs_test.c

>> +++ b/tools/testing/selftests/kvm/s390x/sync_regs_test.c

>> @@ -20,6 +20,7 @@

>>  

>>  #include "test_util.h"

>>  #include "kvm_util.h"

>> +#include "diag318_test_handler.h"

>>  

>>  #define VCPU_ID 5

>>  

>> @@ -70,7 +71,7 @@ static void compare_sregs(struct kvm_sregs *left, struct kvm_sync_regs *right)

>>  

>>  #undef REG_COMPARE

>>  

>> -#define TEST_SYNC_FIELDS   (KVM_SYNC_GPRS|KVM_SYNC_ACRS|KVM_SYNC_CRS)

>> +#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[])

>> @@ -152,6 +153,12 @@ int main(int argc, char *argv[])

>>  

>>  	run->kvm_valid_regs = TEST_SYNC_FIELDS;

>>  	run->kvm_dirty_regs = KVM_SYNC_GPRS | KVM_SYNC_ACRS;

>> +

>> +	if (get_diag318_info() > 0) {

>> +		run->s.regs.diag318 = get_diag318_info();

>> +		run->kvm_dirty_regs |= KVM_SYNC_DIAG318;

>> +	}

>> +

>>  	rv = _vcpu_run(vm, VCPU_ID);

>>  	TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv);

>>  	TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC,

>> @@ -164,6 +171,9 @@ int main(int argc, char *argv[])

>>  	TEST_ASSERT(run->s.regs.acrs[0]  == 1 << 11,

>>  		    "acr0 sync regs value incorrect 0x%x.",

>>  		    run->s.regs.acrs[0]);

>> +	TEST_ASSERT(run->s.regs.diag318 == get_diag318_info(),

>> +		    "diag318 sync regs value incorrect 0x%llx.",

>> +		    run->s.regs.diag318);

>>  

>>  	vcpu_regs_get(vm, VCPU_ID, &regs);

>>  	compare_regs(&regs, &run->s.regs);

>> @@ -177,6 +187,7 @@ int main(int argc, char *argv[])

>>  	run->kvm_valid_regs = TEST_SYNC_FIELDS;

>>  	run->kvm_dirty_regs = 0;

>>  	run->s.regs.gprs[11] = 0xDEADBEEF;

>> +	run->s.regs.diag318 = 0x4B1D;

>>  	rv = _vcpu_run(vm, VCPU_ID);

>>  	TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv);

>>  	TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC,

>> @@ -186,6 +197,9 @@ int main(int argc, char *argv[])

>>  	TEST_ASSERT(run->s.regs.gprs[11] != 0xDEADBEEF,

>>  		    "r11 sync regs value incorrect 0x%llx.",

>>  		    run->s.regs.gprs[11]);

>> +	TEST_ASSERT(run->s.regs.diag318 != 0x4B1D,

>> +		    "diag318 sync regs value incorrect 0x%llx.",

>> +		    run->s.regs.diag318);

>>  

>>  	kvm_vm_free(vm);

>>  

>>

> 



-- 
Regards,
Collin

Stay safe and stay healthy
Collin Walling Dec. 7, 2020, 3:26 p.m. UTC | #4
On 12/7/20 3:19 AM, Christian Borntraeger wrote:
> 

> 

> On 07.12.20 09:16, Janosch Frank wrote:

>> On 12/3/20 10:52 PM, Collin Walling wrote:

>>> The DIAGNOSE 0x0318 instruction, unique to s390x, is a privileged call

>>

>> s/call/instruction/

>>

>>> that must be intercepted via SIE, handled in userspace, and the

>>> information set by the instruction is communicated back to KVM.

>>>

>>> To test the instruction interception, an ad-hoc handler is defined which

>>> simply has a VM execute the instruction and then userspace will extract

>>> the necessary info. The handler is defined such that the instruction

>>> invocation occurs only once. It is up to the caller to determine how the

>>> info returned by this handler should be used.

>>>

>>> The diag318 info is communicated from userspace to KVM via a sync_regs

>>> call. This is tested during a sync_regs test, where the diag318 info is

>>> requested via the handler, then the info is stored in the appropriate

>>> register in KVM via a sync registers call.

>>>

>>> If KVM does not support diag318, then the tests will print a message

>>> stating that diag318 was skipped, and the asserts will simply test

>>> against a value of 0.

>>>

>>> Signed-off-by: Collin Walling <walling@linux.ibm.com>

>>

>> Acked-by: Janosch Frank <frankja@linux.ibm.com>

>>

>> Some nits below.

> 

> Collin, can you have a look at the nits and resubmit soon? Then I can pick this

> for 5.11.

> 


Will do.

[...[


-- 
Regards,
Collin

Stay safe and stay healthy
diff mbox series

Patch

diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 3d14ef77755e..426c78449044 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -36,7 +36,7 @@  endif
 LIBKVM = lib/assert.c lib/elf.c lib/io.c lib/kvm_util.c lib/sparsebit.c lib/test_util.c
 LIBKVM_x86_64 = lib/x86_64/processor.c lib/x86_64/vmx.c lib/x86_64/svm.c lib/x86_64/ucall.c lib/x86_64/handlers.S
 LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c
-LIBKVM_s390x = lib/s390x/processor.c lib/s390x/ucall.c
+LIBKVM_s390x = lib/s390x/processor.c lib/s390x/ucall.c lib/s390x/diag318_test_handler.c
 
 TEST_GEN_PROGS_x86_64 = x86_64/cr4_cpuid_sync_test
 TEST_GEN_PROGS_x86_64 += x86_64/evmcs_test
diff --git a/tools/testing/selftests/kvm/include/s390x/diag318_test_handler.h b/tools/testing/selftests/kvm/include/s390x/diag318_test_handler.h
new file mode 100644
index 000000000000..b0ed71302722
--- /dev/null
+++ b/tools/testing/selftests/kvm/include/s390x/diag318_test_handler.h
@@ -0,0 +1,13 @@ 
+/* SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * Test handler for the s390x DIAGNOSE 0x0318 instruction.
+ *
+ * Copyright (C) 2020, IBM
+ */
+
+#ifndef SELFTEST_KVM_DIAG318_TEST_HANDLER
+#define SELFTEST_KVM_DIAG318_TEST_HANDLER
+
+uint64_t get_diag318_info(void);
+
+#endif
diff --git a/tools/testing/selftests/kvm/lib/s390x/diag318_test_handler.c b/tools/testing/selftests/kvm/lib/s390x/diag318_test_handler.c
new file mode 100644
index 000000000000..1e0b766efeb7
--- /dev/null
+++ b/tools/testing/selftests/kvm/lib/s390x/diag318_test_handler.c
@@ -0,0 +1,82 @@ 
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Test handler for the s390x DIAGNOSE 0x0318 instruction.
+ *
+ * Copyright (C) 2020, IBM
+ */
+
+#include "test_util.h"
+#include "kvm_util.h"
+
+#define VCPU_ID	5
+
+#define ICPT_INSTRUCTION	0x04
+#define IPA0_DIAG		0x8300
+
+static void guest_code(void)
+{
+	uint64_t diag318_info = 0x12345678;
+
+	asm volatile ("diag %0,0,0x318\n" : : "d" (diag318_info));
+}
+
+/*
+ * The DIAGNOSE 0x0318 instruction call must be handled via userspace. As such,
+ * we create an ad-hoc VM here to handle the instruction then extract the
+ * necessary data. It is up to the caller to decide what to do with that data.
+ */
+static uint64_t diag318_handler(void)
+{
+	struct kvm_vm *vm;
+	struct kvm_run *run;
+	uint64_t reg;
+	uint64_t diag318_info;
+
+	vm = vm_create_default(VCPU_ID, 0, guest_code);
+	vcpu_run(vm, VCPU_ID);
+	run = vcpu_state(vm, VCPU_ID);
+
+	TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC,
+		    "DIAGNOSE 0x0318 instruction was not intercepted");
+	TEST_ASSERT(run->s390_sieic.icptcode == ICPT_INSTRUCTION,
+		    "Unexpected intercept code: 0x%x", run->s390_sieic.icptcode);
+	TEST_ASSERT((run->s390_sieic.ipa & 0xff00) == IPA0_DIAG,
+		    "Unexpected IPA0 code: 0x%x", (run->s390_sieic.ipa & 0xff00));
+
+	reg = (run->s390_sieic.ipa & 0x00f0) >> 4;
+	diag318_info = run->s.regs.gprs[reg];
+
+	TEST_ASSERT(diag318_info != 0, "DIAGNOSE 0x0318 info not set");
+
+	kvm_vm_free(vm);
+
+	return diag318_info;
+}
+
+uint64_t get_diag318_info(void)
+{
+	static uint64_t diag318_info;
+	static bool printed_skip;
+
+	/*
+	 * If KVM does not support diag318, then return 0 to
+	 * ensure tests do not break.
+	 */
+	if (!kvm_check_cap(KVM_CAP_S390_DIAG318)) {
+		if (!printed_skip) {
+			fprintf(stdout, "KVM_CAP_S390_DIAG318 not supported. "
+				"Skipping diag318 test.\n");
+			printed_skip = true;
+		}
+		return 0;
+	}
+
+	/*
+	 * If a test has previously requested the diag318 info,
+	 * then don't bother spinning up a temporary VM again.
+	 */
+	if (!diag318_info)
+		diag318_info = diag318_handler();
+
+	return diag318_info;
+}
diff --git a/tools/testing/selftests/kvm/s390x/resets.c b/tools/testing/selftests/kvm/s390x/resets.c
index b143db6d8693..b3d7d4ac2d54 100644
--- a/tools/testing/selftests/kvm/s390x/resets.c
+++ b/tools/testing/selftests/kvm/s390x/resets.c
@@ -110,6 +110,7 @@  static void assert_clear(void)
 
 	TEST_ASSERT(!memcmp(sync_regs->vrs, regs_null, sizeof(sync_regs->vrs)),
 		    "vrs0-15 == 0 (sync_regs)");
+
 }
 
 static void assert_initial_noclear(void)
diff --git a/tools/testing/selftests/kvm/s390x/sync_regs_test.c b/tools/testing/selftests/kvm/s390x/sync_regs_test.c
index 5731ccf34917..caf7b8859a94 100644
--- a/tools/testing/selftests/kvm/s390x/sync_regs_test.c
+++ b/tools/testing/selftests/kvm/s390x/sync_regs_test.c
@@ -20,6 +20,7 @@ 
 
 #include "test_util.h"
 #include "kvm_util.h"
+#include "diag318_test_handler.h"
 
 #define VCPU_ID 5
 
@@ -70,7 +71,7 @@  static void compare_sregs(struct kvm_sregs *left, struct kvm_sync_regs *right)
 
 #undef REG_COMPARE
 
-#define TEST_SYNC_FIELDS   (KVM_SYNC_GPRS|KVM_SYNC_ACRS|KVM_SYNC_CRS)
+#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[])
@@ -152,6 +153,12 @@  int main(int argc, char *argv[])
 
 	run->kvm_valid_regs = TEST_SYNC_FIELDS;
 	run->kvm_dirty_regs = KVM_SYNC_GPRS | KVM_SYNC_ACRS;
+
+	if (get_diag318_info() > 0) {
+		run->s.regs.diag318 = get_diag318_info();
+		run->kvm_dirty_regs |= KVM_SYNC_DIAG318;
+	}
+
 	rv = _vcpu_run(vm, VCPU_ID);
 	TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv);
 	TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC,
@@ -164,6 +171,9 @@  int main(int argc, char *argv[])
 	TEST_ASSERT(run->s.regs.acrs[0]  == 1 << 11,
 		    "acr0 sync regs value incorrect 0x%x.",
 		    run->s.regs.acrs[0]);
+	TEST_ASSERT(run->s.regs.diag318 == get_diag318_info(),
+		    "diag318 sync regs value incorrect 0x%llx.",
+		    run->s.regs.diag318);
 
 	vcpu_regs_get(vm, VCPU_ID, &regs);
 	compare_regs(&regs, &run->s.regs);
@@ -177,6 +187,7 @@  int main(int argc, char *argv[])
 	run->kvm_valid_regs = TEST_SYNC_FIELDS;
 	run->kvm_dirty_regs = 0;
 	run->s.regs.gprs[11] = 0xDEADBEEF;
+	run->s.regs.diag318 = 0x4B1D;
 	rv = _vcpu_run(vm, VCPU_ID);
 	TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv);
 	TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC,
@@ -186,6 +197,9 @@  int main(int argc, char *argv[])
 	TEST_ASSERT(run->s.regs.gprs[11] != 0xDEADBEEF,
 		    "r11 sync regs value incorrect 0x%llx.",
 		    run->s.regs.gprs[11]);
+	TEST_ASSERT(run->s.regs.diag318 != 0x4B1D,
+		    "diag318 sync regs value incorrect 0x%llx.",
+		    run->s.regs.diag318);
 
 	kvm_vm_free(vm);