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KVM: s390: selftests: Extended user_operexec tests

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There is a possibility that the user_operexec capability
only works if facility bit 74 is enabled. This is now fixed,
but add a selftest to demonstrate that.

Signed-off-by: Eric Farman <farman@linux.ibm.com>
Acked-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-ID: <20260507200836.3500368-3-farman@linux.ibm.com>
This commit is contained in:
Eric Farman 2026-05-07 22:08:35 +02:00 committed by Claudio Imbrenda
parent 02d61d3370
commit 1a4794f17d
2 changed files with 116 additions and 0 deletions
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6
tools/testing/selftests/kvm/include/s390/facility.h
View File

@ -11,6 +11,7 @@
#ifndef SELFTEST_KVM_FACILITY_H
#define SELFTEST_KVM_FACILITY_H
#include <linux/atomic.h>
#include <linux/bitops.h>
/* alt_stfle_fac_list[16] + stfle_fac_list[16] */
@ -19,6 +20,11 @@
extern u64 stfl_doublewords[NB_STFL_DOUBLEWORDS];
extern bool stfle_flag;
static inline bool clear_bit_inv(unsigned long nr, unsigned long *ptr)
{
return clear_bit(nr ^ (BITS_PER_LONG - 1), ptr);
}
static inline bool test_bit_inv(unsigned long nr, const unsigned long *ptr)
{
return test_bit(nr ^ (BITS_PER_LONG - 1), ptr);

110
tools/testing/selftests/kvm/s390/user_operexec.c
View File

@ -6,6 +6,7 @@
* Authors:
* Janosch Frank <frankja@linux.ibm.com>
*/
#include "facility.h"
#include "kselftest.h"
#include "kvm_util.h"
#include "test_util.h"
@ -109,6 +110,111 @@ static void test_user_operexec_combined(void)
kvm_vm_free(vm);
}
static struct kvm_vm *create_vm_without_sthyi(void)
{
struct kvm_s390_vm_cpu_processor info;
struct kvm_vm *vm;
vm = vm_create(1);
kvm_device_attr_get(vm->fd, KVM_S390_VM_CPU_MODEL,
KVM_S390_VM_CPU_PROCESSOR, &info);
clear_bit_inv(74, (unsigned long *)&info.fac_list);
kvm_device_attr_set(vm->fd, KVM_S390_VM_CPU_MODEL,
KVM_S390_VM_CPU_PROCESSOR, &info);
return vm;
}
static void test_user_instr0_no_stfle_74(void)
{
struct kvm_vcpu *vcpu;
struct kvm_vm *vm;
int rc;
vm = create_vm_without_sthyi();
rc = __vm_enable_cap(vm, KVM_CAP_S390_USER_INSTR0, 0);
TEST_ASSERT_EQ(0, rc);
vcpu = vm_vcpu_add(vm, 0, guest_code_instr0);
vcpu_run(vcpu);
TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_S390_SIEIC);
TEST_ASSERT_EQ(vcpu->run->s390_sieic.icptcode, ICPT_OPEREXC);
TEST_ASSERT_EQ(vcpu->run->s390_sieic.ipa, 0x0000);
kvm_vm_free(vm);
}
static void test_user_operexec_no_stfle_74(void)
{
struct kvm_vcpu *vcpu;
struct kvm_vm *vm;
int rc;
vm = create_vm_without_sthyi();
rc = __vm_enable_cap(vm, KVM_CAP_S390_USER_OPEREXEC, 0);
TEST_ASSERT_EQ(0, rc);
vcpu = vm_vcpu_add(vm, 0, guest_code_user_operexec);
vcpu_run(vcpu);
TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_S390_SIEIC);
TEST_ASSERT_EQ(vcpu->run->s390_sieic.icptcode, ICPT_OPEREXC);
TEST_ASSERT_EQ(vcpu->run->s390_sieic.ipa, 0x0807);
kvm_vm_free(vm);
}
static void test_instr0_combined_no_stfle_74(void)
{
struct kvm_vcpu *vcpu;
struct kvm_vm *vm;
int rc;
vm = create_vm_without_sthyi();
rc = __vm_enable_cap(vm, KVM_CAP_S390_USER_INSTR0, 0);
TEST_ASSERT_EQ(0, rc);
rc = __vm_enable_cap(vm, KVM_CAP_S390_USER_OPEREXEC, 0);
TEST_ASSERT_EQ(0, rc);
vcpu = vm_vcpu_add(vm, 0, guest_code_instr0);
vcpu_run(vcpu);
TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_S390_SIEIC);
TEST_ASSERT_EQ(vcpu->run->s390_sieic.icptcode, ICPT_OPEREXC);
TEST_ASSERT_EQ(vcpu->run->s390_sieic.ipa, 0x0000);
kvm_vm_free(vm);
}
static void test_operexec_combined_no_stfle_74(void)
{
struct kvm_vcpu *vcpu;
struct kvm_vm *vm;
int rc;
vm = create_vm_without_sthyi();
rc = __vm_enable_cap(vm, KVM_CAP_S390_USER_INSTR0, 0);
TEST_ASSERT_EQ(0, rc);
rc = __vm_enable_cap(vm, KVM_CAP_S390_USER_OPEREXEC, 0);
TEST_ASSERT_EQ(0, rc);
vcpu = vm_vcpu_add(vm, 0, guest_code_user_operexec);
vcpu_run(vcpu);
TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_S390_SIEIC);
TEST_ASSERT_EQ(vcpu->run->s390_sieic.icptcode, ICPT_OPEREXC);
TEST_ASSERT_EQ(vcpu->run->s390_sieic.ipa, 0x0807);
kvm_vm_free(vm);
}
/*
* Run all tests above.
*
@ -122,6 +228,10 @@ static struct testdef {
{ "instr0", test_user_instr0 },
{ "operexec", test_user_operexec },
{ "operexec_combined", test_user_operexec_combined},
{ "instr0_no_stfle_74", test_user_instr0_no_stfle_74 },
{ "instr0_combined_no_stfle_74", test_instr0_combined_no_stfle_74 },
{ "operexec_combined_no_stfle_74", test_operexec_combined_no_stfle_74 },
{ "operexec_no_stfle_74", test_user_operexec_no_stfle_74 },
};
int main(int argc, char *argv[])