81 lines
1.9 KiB
C
81 lines
1.9 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Test handler for the s390x DIAGNOSE 0x0318 instruction.
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*
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* Copyright (C) 2020, IBM
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*/
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#include "test_util.h"
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#include "kvm_util.h"
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#define ICPT_INSTRUCTION 0x04
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#define IPA0_DIAG 0x8300
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static void guest_code(void)
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{
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uint64_t diag318_info = 0x12345678;
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asm volatile ("diag %0,0,0x318\n" : : "d" (diag318_info));
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}
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/*
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* The DIAGNOSE 0x0318 instruction call must be handled via userspace. As such,
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* we create an ad-hoc VM here to handle the instruction then extract the
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* necessary data. It is up to the caller to decide what to do with that data.
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*/
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static uint64_t diag318_handler(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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struct kvm_run *run;
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uint64_t reg;
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uint64_t diag318_info;
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vm = vm_create_with_one_vcpu(&vcpu, guest_code);
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vcpu_run(vcpu);
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run = vcpu->run;
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TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_S390_SIEIC);
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TEST_ASSERT(run->s390_sieic.icptcode == ICPT_INSTRUCTION,
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"Unexpected intercept code: 0x%x", run->s390_sieic.icptcode);
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TEST_ASSERT((run->s390_sieic.ipa & 0xff00) == IPA0_DIAG,
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"Unexpected IPA0 code: 0x%x", (run->s390_sieic.ipa & 0xff00));
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reg = (run->s390_sieic.ipa & 0x00f0) >> 4;
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diag318_info = run->s.regs.gprs[reg];
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TEST_ASSERT(diag318_info != 0, "DIAGNOSE 0x0318 info not set");
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kvm_vm_free(vm);
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return diag318_info;
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}
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uint64_t get_diag318_info(void)
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{
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static uint64_t diag318_info;
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static bool printed_skip;
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/*
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* If KVM does not support diag318, then return 0 to
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* ensure tests do not break.
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*/
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if (!kvm_has_cap(KVM_CAP_S390_DIAG318)) {
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if (!printed_skip) {
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fprintf(stdout, "KVM_CAP_S390_DIAG318 not supported. "
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"Skipping diag318 test.\n");
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printed_skip = true;
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}
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return 0;
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}
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/*
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* If a test has previously requested the diag318 info,
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* then don't bother spinning up a temporary VM again.
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*/
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if (!diag318_info)
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diag318_info = diag318_handler();
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return diag318_info;
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}
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