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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2022 Oxide Computer Company
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <strings.h>
#include <libgen.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/sysmacros.h>
#include <sys/debug.h>
#include <sys/vmm.h>
#include <sys/vmm_dev.h>
#include <vmmapi.h>
#include "in_guest.h"
#include "test_defs.h"
typedef struct reading {
hrtime_t when;
uint32_t value;
} reading_t;
static bool
check_reading(reading_t before, reading_t after, uint_t divisor,
uint_t tick_margin, uint_t ppm_margin)
{
hrtime_t time_delta = after.when - before.when;
uint32_t tick_delta;
/*
* The ticks margin should shrink proportionally to how coarsely the
* timer clock is being divided.
*/
tick_margin /= divisor;
/* timer is counting down, so act appropriately */
if (after.value > before.value) {
/* handle rollover */
tick_delta = (UINT32_MAX - after.value) + before.value;
} else {
tick_delta = before.value - after.value;
}
/* is the number of ticks OK? */
if (tick_delta < LAPIC_TARGET_TICKS) {
test_fail_msg("inadequate passage of ticks %u < %u\n",
tick_delta, LAPIC_TARGET_TICKS);
} else if ((tick_delta - LAPIC_TARGET_TICKS) > tick_margin) {
(void) printf("%u ticks outside margin %u\n", tick_delta,
LAPIC_TARGET_TICKS + tick_margin);
return (false);
}
hrtime_t time_target = (tick_delta * NANOSEC * divisor) / LAPIC_FREQ;
hrtime_t offset;
if (time_delta < time_target) {
offset = time_target - time_delta;
} else {
offset = time_delta - time_target;
}
uint64_t ppm = (offset * 1000000) / time_target;
(void) printf("params: tick_margin=%u ppm_margin=%lu divisor=%u\n",
tick_margin, ppm_margin, divisor);
(void) printf("%u ticks in %lu ns (error %lu ppm)\n",
tick_delta, time_delta, ppm);
if (ppm > ppm_margin) {
(void) printf("UNACCEPTABLE!\n");
return (false);
}
return (true);
}
static void
test_for_divisor(struct vmctx *ctx, uint_t divisor, struct vm_entry *ventry,
struct vm_exit *vexit)
{
reading_t readings[2];
uint_t nread = 0;
uint_t nrepeat = 0;
const uint_t margin_ticks = MAX(1, LAPIC_TARGET_TICKS / 5000);
const uint_t margin_ppm = 400;
do {
const enum vm_exit_kind kind =
test_run_vcpu(ctx, 0, ventry, vexit);
if (kind == VEK_REENTR) {
continue;
} else if (kind != VEK_UNHANDLED) {
test_fail_vmexit(vexit);
}
/* input the divisor */
if (vexit_match_inout(vexit, true, IOP_TEST_PARAM, 4, NULL)) {
ventry_fulfill_inout(vexit, ventry, divisor);
continue;
}
uint32_t v;
if (vexit_match_inout(vexit, false, IOP_TEST_VALUE, 4, &v)) {
readings[nread].when = gethrtime();
readings[nread].value = v;
ventry_fulfill_inout(vexit, ventry, 0);
nread++;
if (nread != 2) {
continue;
}
if (check_reading(readings[0], readings[1], divisor,
margin_ticks, margin_ppm)) {
(void) printf("good result\n");
return;
} else {
nrepeat++;
if (nrepeat < 3) {
nread = 0;
(void) printf("retry %u\n", nrepeat);
continue;
}
test_fail_msg("bad result after %u retries\n",
nrepeat);
}
} else {
test_fail_vmexit(vexit);
}
} while (true);
}
int
main(int argc, char *argv[])
{
const char *test_suite_name = basename(argv[0]);
struct vmctx *ctx = NULL;
int err;
ctx = test_initialize(test_suite_name);
err = test_setup_vcpu(ctx, 0, MEM_LOC_PAYLOAD, MEM_LOC_STACK);
if (err != 0) {
test_fail_errno(err, "Could not initialize vcpu0");
}
struct vm_entry ventry = { 0 };
struct vm_exit vexit = { 0 };
test_for_divisor(ctx, 2, &ventry, &vexit);
test_for_divisor(ctx, 4, &ventry, &vexit);
test_for_divisor(ctx, 16, &ventry, &vexit);
test_pass();
return (0);
}
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