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Setting KVM_CAP_S390_USER_OPEREXEC will forward all operation exceptions to user space. This also includes the 0x0000 instructions managed by KVM_CAP_S390_USER_INSTR0. It's helpful if user space wants to emulate instructions which do not (yet) have an opcode. While we're at it refine the documentation for KVM_CAP_S390_USER_INSTR0. Signed-off-by: Janosch Frank <frankja@linux.ibm.com> Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Acked-by: Christian Borntraeger <borntraeger@linux.ibm.com> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
141 lines
3.4 KiB
C
141 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Test operation exception forwarding.
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*
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* Copyright IBM Corp. 2025
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*
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* Authors:
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* Janosch Frank <frankja@linux.ibm.com>
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*/
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#include "kselftest.h"
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#include "kvm_util.h"
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#include "test_util.h"
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#include "sie.h"
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#include <linux/kvm.h>
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static void guest_code_instr0(void)
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{
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asm(".word 0x0000");
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}
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static void test_user_instr0(void)
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{
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struct kvm_vcpu *vcpu;
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struct kvm_vm *vm;
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int rc;
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vm = vm_create_with_one_vcpu(&vcpu, guest_code_instr0);
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rc = __vm_enable_cap(vm, KVM_CAP_S390_USER_INSTR0, 0);
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TEST_ASSERT_EQ(0, rc);
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vcpu_run(vcpu);
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TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_S390_SIEIC);
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TEST_ASSERT_EQ(vcpu->run->s390_sieic.icptcode, ICPT_OPEREXC);
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TEST_ASSERT_EQ(vcpu->run->s390_sieic.ipa, 0);
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kvm_vm_free(vm);
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}
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static void guest_code_user_operexec(void)
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{
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asm(".word 0x0807");
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}
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static void test_user_operexec(void)
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{
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struct kvm_vcpu *vcpu;
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struct kvm_vm *vm;
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int rc;
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vm = vm_create_with_one_vcpu(&vcpu, guest_code_user_operexec);
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rc = __vm_enable_cap(vm, KVM_CAP_S390_USER_OPEREXEC, 0);
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TEST_ASSERT_EQ(0, rc);
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vcpu_run(vcpu);
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TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_S390_SIEIC);
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TEST_ASSERT_EQ(vcpu->run->s390_sieic.icptcode, ICPT_OPEREXC);
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TEST_ASSERT_EQ(vcpu->run->s390_sieic.ipa, 0x0807);
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kvm_vm_free(vm);
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/*
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* Since user_operexec is the superset it can be used for the
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* 0 instruction.
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*/
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vm = vm_create_with_one_vcpu(&vcpu, guest_code_instr0);
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rc = __vm_enable_cap(vm, KVM_CAP_S390_USER_OPEREXEC, 0);
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TEST_ASSERT_EQ(0, rc);
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vcpu_run(vcpu);
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TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_S390_SIEIC);
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TEST_ASSERT_EQ(vcpu->run->s390_sieic.icptcode, ICPT_OPEREXC);
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TEST_ASSERT_EQ(vcpu->run->s390_sieic.ipa, 0);
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kvm_vm_free(vm);
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}
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/* combine user_instr0 and user_operexec */
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static void test_user_operexec_combined(void)
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{
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struct kvm_vcpu *vcpu;
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struct kvm_vm *vm;
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int rc;
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vm = vm_create_with_one_vcpu(&vcpu, guest_code_user_operexec);
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rc = __vm_enable_cap(vm, KVM_CAP_S390_USER_INSTR0, 0);
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TEST_ASSERT_EQ(0, rc);
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rc = __vm_enable_cap(vm, KVM_CAP_S390_USER_OPEREXEC, 0);
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TEST_ASSERT_EQ(0, rc);
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vcpu_run(vcpu);
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TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_S390_SIEIC);
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TEST_ASSERT_EQ(vcpu->run->s390_sieic.icptcode, ICPT_OPEREXC);
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TEST_ASSERT_EQ(vcpu->run->s390_sieic.ipa, 0x0807);
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kvm_vm_free(vm);
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/* Reverse enablement order */
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vm = vm_create_with_one_vcpu(&vcpu, guest_code_user_operexec);
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rc = __vm_enable_cap(vm, KVM_CAP_S390_USER_OPEREXEC, 0);
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TEST_ASSERT_EQ(0, rc);
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rc = __vm_enable_cap(vm, KVM_CAP_S390_USER_INSTR0, 0);
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TEST_ASSERT_EQ(0, rc);
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vcpu_run(vcpu);
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TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_S390_SIEIC);
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TEST_ASSERT_EQ(vcpu->run->s390_sieic.icptcode, ICPT_OPEREXC);
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TEST_ASSERT_EQ(vcpu->run->s390_sieic.ipa, 0x0807);
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kvm_vm_free(vm);
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}
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/*
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* Run all tests above.
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*
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* Enablement after VCPU has been added is automatically tested since
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* we enable the capability after VCPU creation.
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*/
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static struct testdef {
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const char *name;
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void (*test)(void);
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} testlist[] = {
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{ "instr0", test_user_instr0 },
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{ "operexec", test_user_operexec },
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{ "operexec_combined", test_user_operexec_combined},
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};
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int main(int argc, char *argv[])
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{
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int idx;
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TEST_REQUIRE(kvm_has_cap(KVM_CAP_S390_USER_INSTR0));
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ksft_print_header();
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ksft_set_plan(ARRAY_SIZE(testlist));
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for (idx = 0; idx < ARRAY_SIZE(testlist); idx++) {
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testlist[idx].test();
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ksft_test_result_pass("%s\n", testlist[idx].name);
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}
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ksft_finished();
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}
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