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// SPDX-License-Identifier: GPL-2.0
/*
* A test for GUEST_PRINTF
*
* Copyright 2022, Google, Inc. and/or its affiliates.
*/
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include "test_util.h"
#include "kvm_util.h"
#include "processor.h"
struct guest_vals {
uint64_t a;
uint64_t b;
uint64_t type;
};
static struct guest_vals vals;
/* GUEST_PRINTF()/GUEST_ASSERT_FMT() does not support float or double. */
#define TYPE_LIST \
TYPE(test_type_i64, I64, "%ld", int64_t) \
TYPE(test_type_u64, U64u, "%lu", uint64_t) \
TYPE(test_type_x64, U64x, "0x%lx", uint64_t) \
TYPE(test_type_X64, U64X, "0x%lX", uint64_t) \
TYPE(test_type_u32, U32u, "%u", uint32_t) \
TYPE(test_type_x32, U32x, "0x%x", uint32_t) \
TYPE(test_type_X32, U32X, "0x%X", uint32_t) \
TYPE(test_type_int, INT, "%d", int) \
TYPE(test_type_char, CHAR, "%c", char) \
TYPE(test_type_str, STR, "'%s'", const char *) \
TYPE(test_type_ptr, PTR, "%p", uintptr_t)
enum args_type {
#define TYPE(fn, ext, fmt_t, T) TYPE_##ext,
TYPE_LIST
#undef TYPE
};
static void run_test(struct kvm_vcpu *vcpu, const char *expected_printf,
const char *expected_assert);
#define BUILD_TYPE_STRINGS_AND_HELPER(fn, ext, fmt_t, T) \
const char *PRINTF_FMT_##ext = "Got params a = " fmt_t " and b = " fmt_t; \
const char *ASSERT_FMT_##ext = "Expected " fmt_t ", got " fmt_t " instead"; \
static void fn(struct kvm_vcpu *vcpu, T a, T b) \
{ \
char expected_printf[UCALL_BUFFER_LEN]; \
char expected_assert[UCALL_BUFFER_LEN]; \
\
snprintf(expected_printf, UCALL_BUFFER_LEN, PRINTF_FMT_##ext, a, b); \
snprintf(expected_assert, UCALL_BUFFER_LEN, ASSERT_FMT_##ext, a, b); \
vals = (struct guest_vals){ (uint64_t)a, (uint64_t)b, TYPE_##ext }; \
sync_global_to_guest(vcpu->vm, vals); \
run_test(vcpu, expected_printf, expected_assert); \
}
#define TYPE(fn, ext, fmt_t, T) \
BUILD_TYPE_STRINGS_AND_HELPER(fn, ext, fmt_t, T)
TYPE_LIST
#undef TYPE
static void guest_code(void)
{
while (1) {
switch (vals.type) {
#define TYPE(fn, ext, fmt_t, T) \
case TYPE_##ext: \
GUEST_PRINTF(PRINTF_FMT_##ext, vals.a, vals.b); \
__GUEST_ASSERT(vals.a == vals.b, \
ASSERT_FMT_##ext, vals.a, vals.b); \
break;
TYPE_LIST
#undef TYPE
default:
GUEST_SYNC(vals.type);
}
GUEST_DONE();
}
}
/*
* Unfortunately this gets a little messy because 'assert_msg' doesn't
* just contains the matching string, it also contains additional assert
* info. Fortunately the part that matches should be at the very end of
* 'assert_msg'.
*/
static void ucall_abort(const char *assert_msg, const char *expected_assert_msg)
{
int len_str = strlen(assert_msg);
int len_substr = strlen(expected_assert_msg);
int offset = len_str - len_substr;
TEST_ASSERT(len_substr <= len_str,
"Expected '%s' to be a substring of '%s'\n",
assert_msg, expected_assert_msg);
TEST_ASSERT(strcmp(&assert_msg[offset], expected_assert_msg) == 0,
"Unexpected mismatch. Expected: '%s', got: '%s'",
expected_assert_msg, &assert_msg[offset]);
}
static void run_test(struct kvm_vcpu *vcpu, const char *expected_printf,
const char *expected_assert)
{
struct kvm_run *run = vcpu->run;
struct ucall uc;
while (1) {
vcpu_run(vcpu);
TEST_ASSERT(run->exit_reason == UCALL_EXIT_REASON,
"Unexpected exit reason: %u (%s),\n",
run->exit_reason, exit_reason_str(run->exit_reason));
switch (get_ucall(vcpu, &uc)) {
case UCALL_SYNC:
TEST_FAIL("Unknown 'args_type' = %lu", uc.args[1]);
break;
case UCALL_PRINTF:
TEST_ASSERT(strcmp(uc.buffer, expected_printf) == 0,
"Unexpected mismatch. Expected: '%s', got: '%s'",
expected_printf, uc.buffer);
break;
case UCALL_ABORT:
ucall_abort(uc.buffer, expected_assert);
break;
case UCALL_DONE:
return;
default:
TEST_FAIL("Unknown ucall %lu", uc.cmd);
}
}
}
static void guest_code_limits(void)
{
char test_str[UCALL_BUFFER_LEN + 10];
memset(test_str, 'a', sizeof(test_str));
test_str[sizeof(test_str) - 1] = 0;
GUEST_PRINTF("%s", test_str);
}
static void test_limits(void)
{
struct kvm_vcpu *vcpu;
struct kvm_run *run;
struct kvm_vm *vm;
struct ucall uc;
vm = vm_create_with_one_vcpu(&vcpu, guest_code_limits);
run = vcpu->run;
vcpu_run(vcpu);
TEST_ASSERT(run->exit_reason == UCALL_EXIT_REASON,
"Unexpected exit reason: %u (%s),\n",
run->exit_reason, exit_reason_str(run->exit_reason));
TEST_ASSERT(get_ucall(vcpu, &uc) == UCALL_ABORT,
"Unexpected ucall command: %lu, Expected: %u (UCALL_ABORT)\n",
uc.cmd, UCALL_ABORT);
kvm_vm_free(vm);
}
int main(int argc, char *argv[])
{
struct kvm_vcpu *vcpu;
struct kvm_vm *vm;
vm = vm_create_with_one_vcpu(&vcpu, guest_code);
test_type_i64(vcpu, -1, -1);
test_type_i64(vcpu, -1, 1);
test_type_i64(vcpu, 0x1234567890abcdef, 0x1234567890abcdef);
test_type_i64(vcpu, 0x1234567890abcdef, 0x1234567890abcdee);
test_type_u64(vcpu, 0x1234567890abcdef, 0x1234567890abcdef);
test_type_u64(vcpu, 0x1234567890abcdef, 0x1234567890abcdee);
test_type_x64(vcpu, 0x1234567890abcdef, 0x1234567890abcdef);
test_type_x64(vcpu, 0x1234567890abcdef, 0x1234567890abcdee);
test_type_X64(vcpu, 0x1234567890abcdef, 0x1234567890abcdef);
test_type_X64(vcpu, 0x1234567890abcdef, 0x1234567890abcdee);
test_type_u32(vcpu, 0x90abcdef, 0x90abcdef);
test_type_u32(vcpu, 0x90abcdef, 0x90abcdee);
test_type_x32(vcpu, 0x90abcdef, 0x90abcdef);
test_type_x32(vcpu, 0x90abcdef, 0x90abcdee);
test_type_X32(vcpu, 0x90abcdef, 0x90abcdef);
test_type_X32(vcpu, 0x90abcdef, 0x90abcdee);
test_type_int(vcpu, -1, -1);
test_type_int(vcpu, -1, 1);
test_type_int(vcpu, 1, 1);
test_type_char(vcpu, 'a', 'a');
test_type_char(vcpu, 'a', 'A');
test_type_char(vcpu, 'a', 'b');
test_type_str(vcpu, "foo", "foo");
test_type_str(vcpu, "foo", "bar");
test_type_ptr(vcpu, 0x1234567890abcdef, 0x1234567890abcdef);
test_type_ptr(vcpu, 0x1234567890abcdef, 0x1234567890abcdee);
kvm_vm_free(vm);
test_limits();
return 0;
}
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