83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
|
// 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 VCPU_ID 6
|
||
|
|
|
||
|
|
#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_vm *vm;
|
||
|
|
struct kvm_run *run;
|
||
|
|
uint64_t reg;
|
||
|
|
uint64_t diag318_info;
|
||
|
|
|
||
|
|
vm = vm_create_default(VCPU_ID, 0, guest_code);
|
||
|
|
vcpu_run(vm, VCPU_ID);
|
||
|
|
run = vcpu_state(vm, VCPU_ID);
|
||
|
|
|
||
|
|
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_check_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;
|
||
|
|
}
|