test: Postcopy

This is a postcopy test (x86 only) that actually runs the guest
and checks the memory contents.

The test runs from an x86 boot block with the hex embedded in the test;
the source for this is:

...........

.code16
.org 0x7c00
	.file	"fill.s"
	.text
	.globl	start
	.type	start, @function
start:             # at 0x7c00 ?
        cli
        lgdt gdtdesc
        mov $1,%eax
        mov %eax,%cr0  # Protected mode enable
        data32 ljmp $8,$0x7c20

.org 0x7c20
.code32
        # A20 enable - not sure I actually need this
        inb $0x92,%al
        or  $2,%al
        outb %al, $0x92

        # set up DS for the whole of RAM (needed on KVM)
        mov $16,%eax
        mov %eax,%ds

        mov $65,%ax
        mov $0x3f8,%dx
        outb %al,%dx

        # bl keeps a counter so we limit the output speed
        mov $0, %bl
mainloop:
        # Start from 1MB
        mov $(1024*1024),%eax
innerloop:
        incb (%eax)
        add $4096,%eax
        cmp $(100*1024*1024),%eax
        jl innerloop

        inc %bl
        jnz mainloop

        mov $66,%ax
        mov $0x3f8,%dx
        outb %al,%dx

	jmp mainloop

        # GDT magic from old (GPLv2)  Grub startup.S
        .p2align        2       /* force 4-byte alignment */
gdt:
        .word   0, 0
        .byte   0, 0, 0, 0

        /* -- code segment --
         * base = 0x00000000, limit = 0xFFFFF (4 KiB Granularity), present
         * type = 32bit code execute/read, DPL = 0
         */
        .word   0xFFFF, 0
        .byte   0, 0x9A, 0xCF, 0

        /* -- data segment --
         * base = 0x00000000, limit 0xFFFFF (4 KiB Granularity), present
         * type = 32 bit data read/write, DPL = 0
         */
        .word   0xFFFF, 0
        .byte   0, 0x92, 0xCF, 0

gdtdesc:
        .word   0x27                    /* limit */
        .long   gdt                     /* addr */

/* I'm a bootable disk */
.org 0x7dfe
        .byte 0x55
        .byte 0xAA

...........

and that can be assembled by the following magic:
    as --32 -march=i486 fill.s -o fill.o
    objcopy -O binary fill.o fill.boot
    dd if=fill.boot of=bootsect bs=256 count=2 skip=124
    xxd -i bootsect

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>
Message-id: 1465816605-29488-5-git-send-email-dgilbert@redhat.com
Message-Id: <1465816605-29488-5-git-send-email-dgilbert@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2016-06-13 12:16:43 +01:00 committed by Amit Shah
parent d3bf5418e2
commit ea0c6d6239
2 changed files with 457 additions and 0 deletions

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@ -234,6 +234,7 @@ endif
check-qtest-i386-y += tests/test-netfilter$(EXESUF) check-qtest-i386-y += tests/test-netfilter$(EXESUF)
check-qtest-i386-y += tests/test-filter-mirror$(EXESUF) check-qtest-i386-y += tests/test-filter-mirror$(EXESUF)
check-qtest-i386-y += tests/test-filter-redirector$(EXESUF) check-qtest-i386-y += tests/test-filter-redirector$(EXESUF)
check-qtest-i386-y += tests/postcopy-test$(EXESUF)
check-qtest-x86_64-y = $(check-qtest-i386-y) check-qtest-x86_64-y = $(check-qtest-i386-y)
gcov-files-i386-y += i386-softmmu/hw/timer/mc146818rtc.c gcov-files-i386-y += i386-softmmu/hw/timer/mc146818rtc.c
gcov-files-x86_64-y = $(subst i386-softmmu/,x86_64-softmmu/,$(gcov-files-i386-y)) gcov-files-x86_64-y = $(subst i386-softmmu/,x86_64-softmmu/,$(gcov-files-i386-y))
@ -599,6 +600,7 @@ tests/usb-hcd-uhci-test$(EXESUF): tests/usb-hcd-uhci-test.o $(libqos-usb-obj-y)
tests/usb-hcd-ehci-test$(EXESUF): tests/usb-hcd-ehci-test.o $(libqos-usb-obj-y) tests/usb-hcd-ehci-test$(EXESUF): tests/usb-hcd-ehci-test.o $(libqos-usb-obj-y)
tests/usb-hcd-xhci-test$(EXESUF): tests/usb-hcd-xhci-test.o $(libqos-usb-obj-y) tests/usb-hcd-xhci-test$(EXESUF): tests/usb-hcd-xhci-test.o $(libqos-usb-obj-y)
tests/pc-cpu-test$(EXESUF): tests/pc-cpu-test.o tests/pc-cpu-test$(EXESUF): tests/pc-cpu-test.o
tests/postcopy-test$(EXESUF): tests/postcopy-test.o
tests/vhost-user-test$(EXESUF): tests/vhost-user-test.o qemu-char.o qemu-timer.o $(qtest-obj-y) $(test-io-obj-y) tests/vhost-user-test$(EXESUF): tests/vhost-user-test.o qemu-char.o qemu-timer.o $(qtest-obj-y) $(test-io-obj-y)
tests/qemu-iotests/socket_scm_helper$(EXESUF): tests/qemu-iotests/socket_scm_helper.o tests/qemu-iotests/socket_scm_helper$(EXESUF): tests/qemu-iotests/socket_scm_helper.o
tests/test-qemu-opts$(EXESUF): tests/test-qemu-opts.o $(test-util-obj-y) tests/test-qemu-opts$(EXESUF): tests/test-qemu-opts.o $(test-util-obj-y)

455
tests/postcopy-test.c Normal file
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@ -0,0 +1,455 @@
/*
* QTest testcase for postcopy
*
* Copyright (c) 2016 Red Hat, Inc. and/or its affiliates
* based on the vhost-user-test.c that is:
* Copyright (c) 2014 Virtual Open Systems Sarl.
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include <glib.h>
#include "libqtest.h"
#include "qemu/option.h"
#include "qemu/range.h"
#include "sysemu/char.h"
#include "sysemu/sysemu.h"
#include <qemu/sockets.h>
const unsigned start_address = 1024 * 1024;
const unsigned end_address = 100 * 1024 * 1024;
bool got_stop;
#if defined(__linux__)
#include <sys/mman.h>
#include <sys/syscall.h>
#include <sys/vfs.h>
#endif
#if defined(__linux__) && defined(__NR_userfaultfd) && defined(CONFIG_EVENTFD)
#include <sys/eventfd.h>
#include <sys/ioctl.h>
#include <linux/userfaultfd.h>
static bool ufd_version_check(void)
{
struct uffdio_api api_struct;
uint64_t ioctl_mask;
int ufd = ufd = syscall(__NR_userfaultfd, O_CLOEXEC);
if (ufd == -1) {
g_test_message("Skipping test: userfaultfd not available");
return false;
}
api_struct.api = UFFD_API;
api_struct.features = 0;
if (ioctl(ufd, UFFDIO_API, &api_struct)) {
g_test_message("Skipping test: UFFDIO_API failed");
return false;
}
ioctl_mask = (__u64)1 << _UFFDIO_REGISTER |
(__u64)1 << _UFFDIO_UNREGISTER;
if ((api_struct.ioctls & ioctl_mask) != ioctl_mask) {
g_test_message("Skipping test: Missing userfault feature");
return false;
}
return true;
}
#else
static bool ufd_version_check(void)
{
g_test_message("Skipping test: Userfault not available (builtdtime)");
return false;
}
#endif
static const char *tmpfs;
/* A simple PC boot sector that modifies memory (1-100MB) quickly
* outputing a 'B' every so often if it's still running.
*/
unsigned char bootsect[] = {
0xfa, 0x0f, 0x01, 0x16, 0x74, 0x7c, 0x66, 0xb8, 0x01, 0x00, 0x00, 0x00,
0x0f, 0x22, 0xc0, 0x66, 0xea, 0x20, 0x7c, 0x00, 0x00, 0x08, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe4, 0x92, 0x0c, 0x02,
0xe6, 0x92, 0xb8, 0x10, 0x00, 0x00, 0x00, 0x8e, 0xd8, 0x66, 0xb8, 0x41,
0x00, 0x66, 0xba, 0xf8, 0x03, 0xee, 0xb3, 0x00, 0xb8, 0x00, 0x00, 0x10,
0x00, 0xfe, 0x00, 0x05, 0x00, 0x10, 0x00, 0x00, 0x3d, 0x00, 0x00, 0x40,
0x06, 0x7c, 0xf2, 0xfe, 0xc3, 0x75, 0xe9, 0x66, 0xb8, 0x42, 0x00, 0x66,
0xba, 0xf8, 0x03, 0xee, 0xeb, 0xde, 0x66, 0x90, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0x00, 0x9a, 0xcf, 0x00,
0xff, 0xff, 0x00, 0x00, 0x00, 0x92, 0xcf, 0x00, 0x27, 0x00, 0x5c, 0x7c,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x55, 0xaa
};
/*
* Wait for some output in the serial output file,
* we get an 'A' followed by an endless string of 'B's
* but on the destination we won't have the A.
*/
static void wait_for_serial(const char *side)
{
char *serialpath = g_strdup_printf("%s/%s", tmpfs, side);
FILE *serialfile = fopen(serialpath, "r");
do {
int readvalue = fgetc(serialfile);
switch (readvalue) {
case 'A':
/* Fine */
break;
case 'B':
/* It's alive! */
fclose(serialfile);
g_free(serialpath);
return;
case EOF:
fseek(serialfile, 0, SEEK_SET);
usleep(1000);
break;
default:
fprintf(stderr, "Unexpected %d on %s serial\n", readvalue, side);
g_assert_not_reached();
}
} while (true);
}
/*
* Events can get in the way of responses we are actually waiting for.
*/
static QDict *return_or_event(QDict *response)
{
const char *event_string;
if (!qdict_haskey(response, "event")) {
return response;
}
/* OK, it was an event */
event_string = qdict_get_str(response, "event");
if (!strcmp(event_string, "STOP")) {
got_stop = true;
}
QDECREF(response);
return return_or_event(qtest_qmp_receive(global_qtest));
}
/*
* It's tricky to use qemu's migration event capability with qtest,
* events suddenly appearing confuse the qmp()/hmp() responses.
* so wait for a couple of passes to have happened before
* going postcopy.
*/
static uint64_t get_migration_pass(void)
{
QDict *rsp, *rsp_return, *rsp_ram;
uint64_t result;
rsp = return_or_event(qmp("{ 'execute': 'query-migrate' }"));
rsp_return = qdict_get_qdict(rsp, "return");
if (!qdict_haskey(rsp_return, "ram")) {
/* Still in setup */
result = 0;
} else {
rsp_ram = qdict_get_qdict(rsp_return, "ram");
result = qdict_get_try_int(rsp_ram, "dirty-sync-count", 0);
QDECREF(rsp);
}
return result;
}
static void wait_for_migration_complete(void)
{
QDict *rsp, *rsp_return;
bool completed;
do {
const char *status;
rsp = return_or_event(qmp("{ 'execute': 'query-migrate' }"));
rsp_return = qdict_get_qdict(rsp, "return");
status = qdict_get_str(rsp_return, "status");
completed = strcmp(status, "completed") == 0;
g_assert_cmpstr(status, !=, "failed");
QDECREF(rsp);
usleep(1000 * 100);
} while (!completed);
}
static void wait_for_migration_pass(void)
{
uint64_t initial_pass = get_migration_pass();
uint64_t pass;
/* Wait for the 1st sync */
do {
initial_pass = get_migration_pass();
if (got_stop || initial_pass) {
break;
}
usleep(1000 * 100);
} while (true);
do {
usleep(1000 * 100);
pass = get_migration_pass();
} while (pass == initial_pass && !got_stop);
}
static void check_guests_ram(void)
{
/* Our ASM test will have been incrementing one byte from each page from
* 1MB to <100MB in order.
* This gives us a constraint that any page's byte should be equal or less
* than the previous pages byte (mod 256); and they should all be equal
* except for one transition at the point where we meet the incrementer.
* (We're running this with the guest stopped).
*/
unsigned address;
uint8_t first_byte;
uint8_t last_byte;
bool hit_edge = false;
bool bad = false;
qtest_memread(global_qtest, start_address, &first_byte, 1);
last_byte = first_byte;
for (address = start_address + 4096; address < end_address; address += 4096)
{
uint8_t b;
qtest_memread(global_qtest, address, &b, 1);
if (b != last_byte) {
if (((b + 1) % 256) == last_byte && !hit_edge) {
/* This is OK, the guest stopped at the point of
* incrementing the previous page but didn't get
* to us yet.
*/
hit_edge = true;
} else {
fprintf(stderr, "Memory content inconsistency at %x"
" first_byte = %x last_byte = %x current = %x"
" hit_edge = %x\n",
address, first_byte, last_byte, b, hit_edge);
bad = true;
}
}
last_byte = b;
}
g_assert_false(bad);
}
static void cleanup(const char *filename)
{
char *path = g_strdup_printf("%s/%s", tmpfs, filename);
unlink(path);
}
static void test_migrate(void)
{
char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs);
QTestState *global = global_qtest, *from, *to;
unsigned char dest_byte_a, dest_byte_b, dest_byte_c, dest_byte_d;
gchar *cmd;
QDict *rsp;
char *bootpath = g_strdup_printf("%s/bootsect", tmpfs);
FILE *bootfile = fopen(bootpath, "wb");
got_stop = false;
g_assert_cmpint(fwrite(bootsect, 512, 1, bootfile), ==, 1);
fclose(bootfile);
cmd = g_strdup_printf("-machine accel=kvm:tcg -m 150M"
" -name pcsource,debug-threads=on"
" -serial file:%s/src_serial"
" -drive file=%s,format=raw",
tmpfs, bootpath);
from = qtest_start(cmd);
g_free(cmd);
cmd = g_strdup_printf("-machine accel=kvm:tcg -m 150M"
" -name pcdest,debug-threads=on"
" -serial file:%s/dest_serial"
" -drive file=%s,format=raw"
" -incoming %s",
tmpfs, bootpath, uri);
to = qtest_init(cmd);
g_free(cmd);
global_qtest = from;
rsp = qmp("{ 'execute': 'migrate-set-capabilities',"
"'arguments': { "
"'capabilities': [ {"
"'capability': 'postcopy-ram',"
"'state': true } ] } }");
g_assert(qdict_haskey(rsp, "return"));
QDECREF(rsp);
global_qtest = to;
rsp = qmp("{ 'execute': 'migrate-set-capabilities',"
"'arguments': { "
"'capabilities': [ {"
"'capability': 'postcopy-ram',"
"'state': true } ] } }");
g_assert(qdict_haskey(rsp, "return"));
QDECREF(rsp);
/* We want to pick a speed slow enough that the test completes
* quickly, but that it doesn't complete precopy even on a slow
* machine, so also set the downtime.
*/
global_qtest = from;
rsp = qmp("{ 'execute': 'migrate_set_speed',"
"'arguments': { 'value': 100000000 } }");
g_assert(qdict_haskey(rsp, "return"));
QDECREF(rsp);
/* 1ms downtime - it should never finish precopy */
rsp = qmp("{ 'execute': 'migrate_set_downtime',"
"'arguments': { 'value': 0.001 } }");
g_assert(qdict_haskey(rsp, "return"));
QDECREF(rsp);
/* Wait for the first serial output from the source */
wait_for_serial("src_serial");
cmd = g_strdup_printf("{ 'execute': 'migrate',"
"'arguments': { 'uri': '%s' } }",
uri);
rsp = qmp(cmd);
g_free(cmd);
g_assert(qdict_haskey(rsp, "return"));
QDECREF(rsp);
wait_for_migration_pass();
rsp = return_or_event(qmp("{ 'execute': 'migrate-start-postcopy' }"));
g_assert(qdict_haskey(rsp, "return"));
QDECREF(rsp);
if (!got_stop) {
qmp_eventwait("STOP");
}
global_qtest = to;
qmp_eventwait("RESUME");
wait_for_serial("dest_serial");
global_qtest = from;
wait_for_migration_complete();
qtest_quit(from);
global_qtest = to;
qtest_memread(to, start_address, &dest_byte_a, 1);
/* Destination still running, wait for a byte to change */
do {
qtest_memread(to, start_address, &dest_byte_b, 1);
usleep(10 * 1000);
} while (dest_byte_a == dest_byte_b);
qmp("{ 'execute' : 'stop'}");
/* With it stopped, check nothing changes */
qtest_memread(to, start_address, &dest_byte_c, 1);
sleep(1);
qtest_memread(to, start_address, &dest_byte_d, 1);
g_assert_cmpint(dest_byte_c, ==, dest_byte_d);
check_guests_ram();
qtest_quit(to);
g_free(uri);
global_qtest = global;
cleanup("bootsect");
cleanup("migsocket");
cleanup("src_serial");
cleanup("dest_serial");
}
int main(int argc, char **argv)
{
char template[] = "/tmp/postcopy-test-XXXXXX";
int ret;
g_test_init(&argc, &argv, NULL);
if (!ufd_version_check()) {
return 0;
}
tmpfs = mkdtemp(template);
if (!tmpfs) {
g_test_message("mkdtemp on path (%s): %s\n", template, strerror(errno));
}
g_assert(tmpfs);
module_call_init(MODULE_INIT_QOM);
qtest_add_func("/postcopy", test_migrate);
ret = g_test_run();
g_assert_cmpint(ret, ==, 0);
ret = rmdir(tmpfs);
if (ret != 0) {
g_test_message("unable to rmdir: path (%s): %s\n",
tmpfs, strerror(errno));
}
return ret;
}