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// 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 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_vcpu *vcpu;
struct kvm_vm *vm;
struct kvm_run *run;
uint64_t reg;
uint64_t diag318_info;
vm = vm_create_with_one_vcpu(&vcpu, guest_code);
vcpu_run(vcpu);
run = vcpu->run;
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_has_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;
}
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