projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| efaa83a3 CW |
1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 2 | /* | |
| 3 | * Test handler for the s390x DIAGNOSE 0x0318 instruction. | |
| 4 | * | |
| 5 | * Copyright (C) 2020, IBM | |
| 6 | */ | |
| 7 | ||
| 8 | #include "test_util.h" | |
| 9 | #include "kvm_util.h" | |
| 10 | ||
| efaa83a3 CW |
11 | #define ICPT_INSTRUCTION 0x04 |
| 12 | #define IPA0_DIAG 0x8300 | |
| 13 | ||
| 14 | static void guest_code(void) | |
| 15 | { | |
| 16 | uint64_t diag318_info = 0x12345678; | |
| 17 | ||
| 18 | asm volatile ("diag %0,0,0x318\n" : : "d" (diag318_info)); | |
| 19 | } | |
| 20 | ||
| 21 | /* | |
| 22 | * The DIAGNOSE 0x0318 instruction call must be handled via userspace. As such, | |
| 23 | * we create an ad-hoc VM here to handle the instruction then extract the | |
| 24 | * necessary data. It is up to the caller to decide what to do with that data. | |
| 25 | */ | |
| 26 | static uint64_t diag318_handler(void) | |
| 27 | { | |
| 7cdcdfe5 | 28 | struct kvm_vcpu *vcpu; |
| efaa83a3 CW |
29 | struct kvm_vm *vm; |
| 30 | struct kvm_run *run; | |
| 31 | uint64_t reg; | |
| 32 | uint64_t diag318_info; | |
| 33 | ||
| 7cdcdfe5 | 34 | vm = vm_create_with_one_vcpu(&vcpu, guest_code); |
| 768e9a61 | 35 | vcpu_run(vcpu); |
| 7cdcdfe5 | 36 | run = vcpu->run; |
| efaa83a3 | 37 | |
| c96f57b0 | 38 | TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_S390_SIEIC); |
| efaa83a3 CW |
39 | TEST_ASSERT(run->s390_sieic.icptcode == ICPT_INSTRUCTION, |
| 40 | "Unexpected intercept code: 0x%x", run->s390_sieic.icptcode); | |
| 41 | TEST_ASSERT((run->s390_sieic.ipa & 0xff00) == IPA0_DIAG, | |
| 42 | "Unexpected IPA0 code: 0x%x", (run->s390_sieic.ipa & 0xff00)); | |
| 43 | ||
| 44 | reg = (run->s390_sieic.ipa & 0x00f0) >> 4; | |
| 45 | diag318_info = run->s.regs.gprs[reg]; | |
| 46 | ||
| 47 | TEST_ASSERT(diag318_info != 0, "DIAGNOSE 0x0318 info not set"); | |
| 48 | ||
| 49 | kvm_vm_free(vm); | |
| 50 | ||
| 51 | return diag318_info; | |
| 52 | } | |
| 53 | ||
| 54 | uint64_t get_diag318_info(void) | |
| 55 | { | |
| 56 | static uint64_t diag318_info; | |
| 57 | static bool printed_skip; | |
| 58 | ||
| 59 | /* | |
| 60 | * If KVM does not support diag318, then return 0 to | |
| 61 | * ensure tests do not break. | |
| 62 | */ | |
| 3ea9b809 | 63 | if (!kvm_has_cap(KVM_CAP_S390_DIAG318)) { |
| efaa83a3 CW |
64 | if (!printed_skip) { |
| 65 | fprintf(stdout, "KVM_CAP_S390_DIAG318 not supported. " | |
| 66 | "Skipping diag318 test.\n"); | |
| 67 | printed_skip = true; | |
| 68 | } | |
| 69 | return 0; | |
| 70 | } | |
| 71 | ||
| 72 | /* | |
| 73 | * If a test has previously requested the diag318 info, | |
| 74 | * then don't bother spinning up a temporary VM again. | |
| 75 | */ | |
| 76 | if (!diag318_info) | |
| 77 | diag318_info = diag318_handler(); | |
| 78 | ||
| 79 | return diag318_info; | |
| 80 | } |