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 $0x3f8,%dx
outb %al,%dx
jmp mainloop
# GDT magic from old (GPLv2) Grub startup.S
.p2align 2 /* force 4-byte alignment */
gdt:
.word 0, 0
.byte 0, 0, 0, 0
/* -- code segment --
* base = 0x00000000, limit = 0xFFFFF (4 KiB Granularity), present
* type = 32bit code execute/read, DPL = 0
*/
.word 0xFFFF, 0
.byte 0, 0x9A, 0xCF, 0
/* -- data segment --
* base = 0x00000000, limit 0xFFFFF (4 KiB Granularity), present
* type = 32 bit data read/write, DPL = 0
*/
.word 0xFFFF, 0
.byte 0, 0x92, 0xCF, 0
gdtdesc:
.word 0x27 /* limit */
.long gdt /* addr */
/* I'm a bootable disk */
.org 0x7dfe
.byte 0x55
.byte 0xAA
...........
and that can be assembled by the following magic:
as --32 -march=i486 fill.s -o fill.o
objcopy -O binary fill.o fill.boot
dd if=fill.boot of=bootsect bs=256 count=2 skip=124
xxd -i bootsect
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>
Message-id: 1465816605-29488-5-git-send-email-dgilbert@redhat.com
Message-Id: <1465816605-29488-5-git-send-email-dgilbert@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert
Amit Shah
parent
d3bf5418e2
commit
ea0c6d6239
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@ -234,6 +234,7 @@ endif
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check-qtest-i386-y += tests/test-netfilter$(EXESUF)
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check-qtest-i386-y += tests/test-filter-mirror$(EXESUF)
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check-qtest-i386-y += tests/test-filter-redirector$(EXESUF)
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check-qtest-i386-y += tests/postcopy-test$(EXESUF)
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check-qtest-x86_64-y = $(check-qtest-i386-y)
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gcov-files-i386-y += i386-softmmu/hw/timer/mc146818rtc.c
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gcov-files-x86_64-y = $(subst i386-softmmu/,x86_64-softmmu/,$(gcov-files-i386-y))
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@ -599,6 +600,7 @@ tests/usb-hcd-uhci-test$(EXESUF): tests/usb-hcd-uhci-test.o $(libqos-usb-obj-y)
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tests/usb-hcd-ehci-test$(EXESUF): tests/usb-hcd-ehci-test.o $(libqos-usb-obj-y)
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tests/usb-hcd-xhci-test$(EXESUF): tests/usb-hcd-xhci-test.o $(libqos-usb-obj-y)
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tests/pc-cpu-test$(EXESUF): tests/pc-cpu-test.o
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tests/postcopy-test$(EXESUF): tests/postcopy-test.o
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tests/vhost-user-test$(EXESUF): tests/vhost-user-test.o qemu-char.o qemu-timer.o $(qtest-obj-y) $(test-io-obj-y)
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tests/qemu-iotests/socket_scm_helper$(EXESUF): tests/qemu-iotests/socket_scm_helper.o
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tests/test-qemu-opts$(EXESUF): tests/test-qemu-opts.o $(test-util-obj-y)
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@ -0,0 +1,455 @@
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/*
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* QTest testcase for postcopy
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*
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* Copyright (c) 2016 Red Hat, Inc. and/or its affiliates
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* based on the vhost-user-test.c that is:
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* Copyright (c) 2014 Virtual Open Systems Sarl.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include <glib.h>
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#include "libqtest.h"
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#include "qemu/option.h"
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#include "qemu/range.h"
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#include "sysemu/char.h"
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#include "sysemu/sysemu.h"
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#include <qemu/sockets.h>
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const unsigned start_address = 1024 * 1024;
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const unsigned end_address = 100 * 1024 * 1024;
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bool got_stop;
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#if defined(__linux__)
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#include <sys/mman.h>
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#include <sys/syscall.h>
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#include <sys/vfs.h>
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#endif
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#if defined(__linux__) && defined(__NR_userfaultfd) && defined(CONFIG_EVENTFD)
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#include <sys/eventfd.h>
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#include <sys/ioctl.h>
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#include <linux/userfaultfd.h>
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static bool ufd_version_check(void)
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{
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struct uffdio_api api_struct;
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uint64_t ioctl_mask;
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int ufd = ufd = syscall(__NR_userfaultfd, O_CLOEXEC);
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if (ufd == -1) {
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g_test_message("Skipping test: userfaultfd not available");
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return false;
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}
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api_struct.api = UFFD_API;
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api_struct.features = 0;
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if (ioctl(ufd, UFFDIO_API, &api_struct)) {
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g_test_message("Skipping test: UFFDIO_API failed");
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return false;
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}
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ioctl_mask = (__u64)1 << _UFFDIO_REGISTER |
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(__u64)1 << _UFFDIO_UNREGISTER;
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if ((api_struct.ioctls & ioctl_mask) != ioctl_mask) {
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g_test_message("Skipping test: Missing userfault feature");
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return false;
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}
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return true;
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}
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#else
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static bool ufd_version_check(void)
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{
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g_test_message("Skipping test: Userfault not available (builtdtime)");
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return false;
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}
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#endif
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static const char *tmpfs;
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/* A simple PC boot sector that modifies memory (1-100MB) quickly
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* outputing a 'B' every so often if it's still running.
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*/
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unsigned char bootsect[] = {
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0xfa, 0x0f, 0x01, 0x16, 0x74, 0x7c, 0x66, 0xb8, 0x01, 0x00, 0x00, 0x00,
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0x0f, 0x22, 0xc0, 0x66, 0xea, 0x20, 0x7c, 0x00, 0x00, 0x08, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe4, 0x92, 0x0c, 0x02,
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0xe6, 0x92, 0xb8, 0x10, 0x00, 0x00, 0x00, 0x8e, 0xd8, 0x66, 0xb8, 0x41,
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0x00, 0x66, 0xba, 0xf8, 0x03, 0xee, 0xb3, 0x00, 0xb8, 0x00, 0x00, 0x10,
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0x00, 0xfe, 0x00, 0x05, 0x00, 0x10, 0x00, 0x00, 0x3d, 0x00, 0x00, 0x40,
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0x06, 0x7c, 0xf2, 0xfe, 0xc3, 0x75, 0xe9, 0x66, 0xb8, 0x42, 0x00, 0x66,
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0xba, 0xf8, 0x03, 0xee, 0xeb, 0xde, 0x66, 0x90, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0x00, 0x9a, 0xcf, 0x00,
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0xff, 0xff, 0x00, 0x00, 0x00, 0x92, 0xcf, 0x00, 0x27, 0x00, 0x5c, 0x7c,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x55, 0xaa
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};
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/*
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* Wait for some output in the serial output file,
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* we get an 'A' followed by an endless string of 'B's
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* but on the destination we won't have the A.
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*/
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static void wait_for_serial(const char *side)
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{
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char *serialpath = g_strdup_printf("%s/%s", tmpfs, side);
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FILE *serialfile = fopen(serialpath, "r");
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do {
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int readvalue = fgetc(serialfile);
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switch (readvalue) {
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case 'A':
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/* Fine */
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break;
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case 'B':
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/* It's alive! */
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fclose(serialfile);
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g_free(serialpath);
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return;
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case EOF:
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fseek(serialfile, 0, SEEK_SET);
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usleep(1000);
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break;
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default:
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fprintf(stderr, "Unexpected %d on %s serial\n", readvalue, side);
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g_assert_not_reached();
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}
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} while (true);
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}
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/*
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* Events can get in the way of responses we are actually waiting for.
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*/
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static QDict *return_or_event(QDict *response)
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{
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const char *event_string;
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if (!qdict_haskey(response, "event")) {
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return response;
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}
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/* OK, it was an event */
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event_string = qdict_get_str(response, "event");
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if (!strcmp(event_string, "STOP")) {
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got_stop = true;
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}
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QDECREF(response);
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return return_or_event(qtest_qmp_receive(global_qtest));
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}
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/*
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* It's tricky to use qemu's migration event capability with qtest,
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* events suddenly appearing confuse the qmp()/hmp() responses.
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* so wait for a couple of passes to have happened before
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* going postcopy.
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*/
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static uint64_t get_migration_pass(void)
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{
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QDict *rsp, *rsp_return, *rsp_ram;
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uint64_t result;
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rsp = return_or_event(qmp("{ 'execute': 'query-migrate' }"));
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rsp_return = qdict_get_qdict(rsp, "return");
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if (!qdict_haskey(rsp_return, "ram")) {
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/* Still in setup */
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result = 0;
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} else {
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rsp_ram = qdict_get_qdict(rsp_return, "ram");
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result = qdict_get_try_int(rsp_ram, "dirty-sync-count", 0);
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QDECREF(rsp);
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}
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return result;
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}
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static void wait_for_migration_complete(void)
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{
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QDict *rsp, *rsp_return;
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bool completed;
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do {
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const char *status;
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rsp = return_or_event(qmp("{ 'execute': 'query-migrate' }"));
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rsp_return = qdict_get_qdict(rsp, "return");
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status = qdict_get_str(rsp_return, "status");
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completed = strcmp(status, "completed") == 0;
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g_assert_cmpstr(status, !=, "failed");
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QDECREF(rsp);
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usleep(1000 * 100);
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} while (!completed);
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}
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static void wait_for_migration_pass(void)
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{
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uint64_t initial_pass = get_migration_pass();
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uint64_t pass;
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/* Wait for the 1st sync */
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do {
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initial_pass = get_migration_pass();
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if (got_stop || initial_pass) {
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break;
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}
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usleep(1000 * 100);
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} while (true);
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do {
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usleep(1000 * 100);
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pass = get_migration_pass();
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} while (pass == initial_pass && !got_stop);
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}
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static void check_guests_ram(void)
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{
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/* Our ASM test will have been incrementing one byte from each page from
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* 1MB to <100MB in order.
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* This gives us a constraint that any page's byte should be equal or less
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* than the previous pages byte (mod 256); and they should all be equal
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* except for one transition at the point where we meet the incrementer.
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* (We're running this with the guest stopped).
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*/
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unsigned address;
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uint8_t first_byte;
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uint8_t last_byte;
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bool hit_edge = false;
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bool bad = false;
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qtest_memread(global_qtest, start_address, &first_byte, 1);
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last_byte = first_byte;
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for (address = start_address + 4096; address < end_address; address += 4096)
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{
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uint8_t b;
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qtest_memread(global_qtest, address, &b, 1);
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if (b != last_byte) {
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if (((b + 1) % 256) == last_byte && !hit_edge) {
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/* This is OK, the guest stopped at the point of
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* incrementing the previous page but didn't get
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* to us yet.
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*/
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hit_edge = true;
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} else {
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fprintf(stderr, "Memory content inconsistency at %x"
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" first_byte = %x last_byte = %x current = %x"
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" hit_edge = %x\n",
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address, first_byte, last_byte, b, hit_edge);
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bad = true;
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}
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}
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last_byte = b;
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}
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g_assert_false(bad);
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}
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static void cleanup(const char *filename)
|
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{
|
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char *path = g_strdup_printf("%s/%s", tmpfs, filename);
|
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|
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unlink(path);
|
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}
|
||||
|
||||
static void test_migrate(void)
|
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{
|
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char *uri = g_strdup_printf("unix:%s/migsocket", tmpfs);
|
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QTestState *global = global_qtest, *from, *to;
|
||||
unsigned char dest_byte_a, dest_byte_b, dest_byte_c, dest_byte_d;
|
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gchar *cmd;
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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;
|
||||
}
|
||||
Loading…
Reference in New Issue