Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging

pc,pci,virtio,hotplug fixes, enhancements

numa work by Hu Tao and others
memory hotplug by Igor
vhost-user by Nikolay, Antonios and others
guest virtio announcements by Jason
qtest fixes by Sergey
qdev hotplug fixes by Paolo
misc other fixes mostly by myself

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

* remotes/mst/tags/for_upstream: (109 commits)
  numa: use RAM_ADDR_FMT with ram_addr_t
  qapi/string-output-visitor: fix bugs
  tests: simplify code
  qapi: fix input visitor bugs
  acpi: rephrase comment
  qmp: add ACPI_DEVICE_OST event handling
  qmp: add query-acpi-ospm-status command
  acpi: implement ospm_status() method for PIIX4/ICH9_LPC devices
  acpi: introduce TYPE_ACPI_DEVICE_IF interface
  qmp: add query-memory-devices command
  numa: handle mmaped memory allocation failure correctly
  pc: acpi: do not hardcode preprocessor
  qmp: clean out whitespace
  qdev: recursively unrealize devices when unrealizing bus
  qdev: reorganize error reporting in bus_set_realized
  qapi: fix build on glib < 2.28
  qapi: make string output visitor parse int list
  qapi: make string input visitor parse int list
  tests: fix memory leak in test of string input visitor
  hmp: add info memdev
  ...

Conflicts:
	include/hw/i386/pc.h
[PMM: fixed minor conflict in pc.h]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

2 files changed, 92 insertions, 0 deletions

diff --git a/util/oslib-posix.c b/util/oslib-posix.c
index 8e9c770..1524ead 100644
--- a/util/oslib-posix.c
+++ b/util/oslib-posix.c
@@ -46,6 +46,7 @@ extern int daemon(int, int);
 #else
 #  define QEMU_VMALLOC_ALIGN getpagesize()
 #endif
+#define HUGETLBFS_MAGIC       0x958458f6
 
 #include <termios.h>
 #include <unistd.h>
@@ -58,9 +59,12 @@ extern int daemon(int, int);
 #include "qemu/sockets.h"
 #include <sys/mman.h>
 #include <libgen.h>
+#include <setjmp.h>
+#include <sys/signal.h>
 
 #ifdef CONFIG_LINUX
 #include <sys/syscall.h>
+#include <sys/vfs.h>
 #endif
 
 #ifdef __FreeBSD__
@@ -332,3 +336,72 @@ char *qemu_get_exec_dir(void)
 {
     return g_strdup(exec_dir);
 }
+
+static sigjmp_buf sigjump;
+
+static void sigbus_handler(int signal)
+{
+    siglongjmp(sigjump, 1);
+}
+
+static size_t fd_getpagesize(int fd)
+{
+#ifdef CONFIG_LINUX
+    struct statfs fs;
+    int ret;
+
+    if (fd != -1) {
+        do {
+            ret = fstatfs(fd, &fs);
+        } while (ret != 0 && errno == EINTR);
+
+        if (ret == 0 && fs.f_type == HUGETLBFS_MAGIC) {
+            return fs.f_bsize;
+        }
+    }
+#endif
+
+    return getpagesize();
+}
+
+void os_mem_prealloc(int fd, char *area, size_t memory)
+{
+    int ret, i;
+    struct sigaction act, oldact;
+    sigset_t set, oldset;
+    size_t hpagesize = fd_getpagesize(fd);
+
+    memset(&act, 0, sizeof(act));
+    act.sa_handler = &sigbus_handler;
+    act.sa_flags = 0;
+
+    ret = sigaction(SIGBUS, &act, &oldact);
+    if (ret) {
+        perror("os_mem_prealloc: failed to install signal handler");
+        exit(1);
+    }
+
+    /* unblock SIGBUS */
+    sigemptyset(&set);
+    sigaddset(&set, SIGBUS);
+    pthread_sigmask(SIG_UNBLOCK, &set, &oldset);
+
+    if (sigsetjmp(sigjump, 1)) {
+        fprintf(stderr, "os_mem_prealloc: failed to preallocate pages\n");
+        exit(1);
+    }
+
+    /* MAP_POPULATE silently ignores failures */
+    memory = (memory + hpagesize - 1) & -hpagesize;
+    for (i = 0; i < (memory/hpagesize); i++) {
+        memset(area + (hpagesize*i), 0, 1);
+    }
+
+    ret = sigaction(SIGBUS, &oldact, NULL);
+    if (ret) {
+        perror("os_mem_prealloc: failed to reinstall signal handler");
+        exit(1);
+    }
+
+    pthread_sigmask(SIG_SETMASK, &oldset, NULL);
+}
diff --git a/util/oslib-win32.c b/util/oslib-win32.c
index 157f10f..507cedd 100644
--- a/util/oslib-win32.c
+++ b/util/oslib-win32.c
@@ -446,3 +446,22 @@ gint g_poll(GPollFD *fds, guint nfds, gint timeout)
 
     return retval;
 }
+
+size_t getpagesize(void)
+{
+    SYSTEM_INFO system_info;
+
+    GetSystemInfo(&system_info);
+    return system_info.dwPageSize;
+}
+
+void os_mem_prealloc(int fd, char *area, size_t memory)
+{
+    int i;
+    size_t pagesize = getpagesize();
+
+    memory = (memory + pagesize - 1) & -pagesize;
+    for (i = 0; i < memory / pagesize; i++) {
+        memset(area + pagesize * i, 0, 1);
+    }
+}