test: port postcopy test to ppc64

As userfaultfd syscall is available on powerpc, migration
postcopy can be used.

This patch adds the support needed to test this on powerpc,
instead of using a bootsector to run code to modify memory,
we use a FORTH script in "boot-command" property.

As spapr machine doesn't support "-prom-env" argument
(the nvram is initialized by SLOF and not by QEMU),
"boot-command" is provided to SLOF via a file mapped nvram
(with "-drive file=...,if=pflash")

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

tests/Makefile.include

@@ -268,6 +268,7 @@ check-qtest-sparc-y += tests/prom-env-test$(EXESUF)
 #check-qtest-sparc64-y += tests/prom-env-test$(EXESUF)
 check-qtest-microblazeel-y = $(check-qtest-microblaze-y)
 check-qtest-xtensaeb-y = $(check-qtest-xtensa-y)
+check-qtest-ppc64-y += tests/postcopy-test$(EXESUF)
 
 check-qtest-generic-y += tests/qom-test$(EXESUF)
 

tests/postcopy-test.c

@@ -18,6 +18,9 @@
 #include "qemu/sockets.h"
 #include "sysemu/char.h"
 #include "sysemu/sysemu.h"
+#include "hw/nvram/openbios_firmware_abi.h"
+
+#define MIN_NVRAM_SIZE 8192 /* from spapr_nvram.c */
 
 const unsigned start_address = 1024 * 1024;
 const unsigned end_address = 100 * 1024 * 1024;
@@ -122,6 +125,44 @@ unsigned char bootsect[] = {
   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x55, 0xaa
 };
 
+static void init_bootfile_x86(const char *bootpath)
+{
+    FILE *bootfile = fopen(bootpath, "wb");
+
+    g_assert_cmpint(fwrite(bootsect, 512, 1, bootfile), ==, 1);
+    fclose(bootfile);
+}
+
+static void init_bootfile_ppc(const char *bootpath)
+{
+    FILE *bootfile;
+    char buf[MIN_NVRAM_SIZE];
+    struct OpenBIOS_nvpart_v1 *header = (struct OpenBIOS_nvpart_v1 *)buf;
+
+    memset(buf, 0, MIN_NVRAM_SIZE);
+
+    /* Create a "common" partition in nvram to store boot-command property */
+
+    header->signature = OPENBIOS_PART_SYSTEM;
+    memcpy(header->name, "common", 6);
+    OpenBIOS_finish_partition(header, MIN_NVRAM_SIZE);
+
+    /* FW_MAX_SIZE is 4MB, but slof.bin is only 900KB,
+     * so let's modify memory between 1MB and 100MB
+     * to do like PC bootsector
+     */
+
+    sprintf(buf + 16,
+            "boot-command=hex .\" _\" begin %x %x do i c@ 1 + i c! 1000 +loop "
+            ".\" B\" 0 until", end_address, start_address);
+
+    /* Write partition to the NVRAM file */
+
+    bootfile = fopen(bootpath, "wb");
+    g_assert_cmpint(fwrite(buf, MIN_NVRAM_SIZE, 1, bootfile), ==, 1);
+    fclose(bootfile);
+}
+
 /*
  * Wait for some output in the serial output file,
  * we get an 'A' followed by an endless string of 'B's
@@ -131,10 +172,29 @@ static void wait_for_serial(const char *side)
 {
     char *serialpath = g_strdup_printf("%s/%s", tmpfs, side);
     FILE *serialfile = fopen(serialpath, "r");
+    const char *arch = qtest_get_arch();
+    int started = (strcmp(side, "src_serial") == 0 &&
+                   strcmp(arch, "ppc64") == 0) ? 0 : 1;
 
     do {
         int readvalue = fgetc(serialfile);
 
+        if (!started) {
+            /* SLOF prints its banner before starting test,
+             * to ignore it, mark the start of the test with '_',
+             * ignore all characters until this marker
+             */
+            switch (readvalue) {
+            case '_':
+                started = 1;
+                break;
+            case EOF:
+                fseek(serialfile, 0, SEEK_SET);
+                usleep(1000);
+                break;
+            }
+            continue;
+        }
         switch (readvalue) {
         case 'A':
             /* Fine */
@@ -147,6 +207,8 @@ static void wait_for_serial(const char *side)
             return;
 
         case EOF:
+            started = (strcmp(side, "src_serial") == 0 &&
+                       strcmp(arch, "ppc64") == 0) ? 0 : 1;
             fseek(serialfile, 0, SEEK_SET);
             usleep(1000);
             break;
@@ -295,32 +357,48 @@ 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;
+    gchar *cmd, *cmd_src, *cmd_dst;
     QDict *rsp;
 
     char *bootpath = g_strdup_printf("%s/bootsect", tmpfs);
-    FILE *bootfile = fopen(bootpath, "wb");
+    const char *arch = qtest_get_arch();
 
     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);
+    if (strcmp(arch, "i386") == 0 || strcmp(arch, "x86_64") == 0) {
+        init_bootfile_x86(bootpath);
+        cmd_src = 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);
+        cmd_dst = 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);
+    } else if (strcmp(arch, "ppc64") == 0) {
+        init_bootfile_ppc(bootpath);
+        cmd_src = g_strdup_printf("-machine accel=kvm:tcg -m 256M"
+                                  " -name pcsource,debug-threads=on"
+                                  " -serial file:%s/src_serial"
+                                  " -drive file=%s,if=pflash,format=raw",
+                                  tmpfs, bootpath);
+        cmd_dst = g_strdup_printf("-machine accel=kvm:tcg -m 256M"
+                                  " -name pcdest,debug-threads=on"
+                                  " -serial file:%s/dest_serial"
+                                  " -incoming %s",
+                                  tmpfs, uri);
+    } else {
+        g_assert_not_reached();
+    }
 
-    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);
+    from = qtest_start(cmd_src);
+    g_free(cmd_src);
+
+    to = qtest_init(cmd_dst);
+    g_free(cmd_dst);
 
     global_qtest = from;
     rsp = qmp("{ 'execute': 'migrate-set-capabilities',"