HMP pull

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Merge remote-tracking branch 'dgilbert/tags/pull-hmp-20170517' into staging

HMP pull

# gpg: Signature made Wed 17 May 2017 07:03:39 PM BST
# gpg:                using RSA key 0x0516331EBC5BFDE7
# gpg: Good signature from "Dr. David Alan Gilbert (RH2) <dgilbert@redhat.com>"
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 45F5 C71B 4A0C B7FB 977A  9FA9 0516 331E BC5B FDE7

* dgilbert/tags/pull-hmp-20170517:
  ramblock: add new hmp command "info ramblock"
  utils: provide size_to_str()
  ramblock: add RAMBLOCK_FOREACH()

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

exec.c

@@ -71,6 +71,8 @@
 #include "qemu/mmap-alloc.h"
 #endif
 
+#include "monitor/monitor.h"
+
 //#define DEBUG_SUBPAGE
 
 #if !defined(CONFIG_USER_ONLY)
@@ -1013,7 +1015,7 @@ static RAMBlock *qemu_get_ram_block(ram_addr_t addr)
     if (block && addr - block->offset < block->max_length) {
         return block;
     }
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         if (addr - block->offset < block->max_length) {
             goto found;
         }
@@ -1368,6 +1370,26 @@ void qemu_mutex_unlock_ramlist(void)
     qemu_mutex_unlock(&ram_list.mutex);
 }
 
+void ram_block_dump(Monitor *mon)
+{
+    RAMBlock *block;
+    char *psize;
+
+    rcu_read_lock();
+    monitor_printf(mon, "%24s %8s  %18s %18s %18s\n",
+                   "Block Name", "PSize", "Offset", "Used", "Total");
+    RAMBLOCK_FOREACH(block) {
+        psize = size_to_str(block->page_size);
+        monitor_printf(mon, "%24s %8s  0x%016" PRIx64 " 0x%016" PRIx64
+                       " 0x%016" PRIx64 "\n", block->idstr, psize,
+                       (uint64_t)block->offset,
+                       (uint64_t)block->used_length,
+                       (uint64_t)block->max_length);
+        g_free(psize);
+    }
+    rcu_read_unlock();
+}
+
 #ifdef __linux__
 /*
  * FIXME TOCTTOU: this iterates over memory backends' mem-path, which
@@ -1613,12 +1635,12 @@ static ram_addr_t find_ram_offset(ram_addr_t size)
         return 0;
     }
 
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         ram_addr_t end, next = RAM_ADDR_MAX;
 
         end = block->offset + block->max_length;
 
-        QLIST_FOREACH_RCU(next_block, &ram_list.blocks, next) {
+        RAMBLOCK_FOREACH(next_block) {
             if (next_block->offset >= end) {
                 next = MIN(next, next_block->offset);
             }
@@ -1644,7 +1666,7 @@ unsigned long last_ram_page(void)
     ram_addr_t last = 0;
 
     rcu_read_lock();
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         last = MAX(last, block->offset + block->max_length);
     }
     rcu_read_unlock();
@@ -1694,7 +1716,7 @@ void qemu_ram_set_idstr(RAMBlock *new_block, const char *name, DeviceState *dev)
     pstrcat(new_block->idstr, sizeof(new_block->idstr), name);
 
     rcu_read_lock();
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         if (block != new_block &&
             !strcmp(block->idstr, new_block->idstr)) {
             fprintf(stderr, "RAMBlock \"%s\" already registered, abort!\n",
@@ -1728,7 +1750,7 @@ size_t qemu_ram_pagesize_largest(void)
     RAMBlock *block;
     size_t largest = 0;
 
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         largest = MAX(largest, qemu_ram_pagesize(block));
     }
 
@@ -1874,7 +1896,7 @@ static void ram_block_add(RAMBlock *new_block, Error **errp)
      * QLIST (which has an RCU-friendly variant) does not have insertion at
      * tail, so save the last element in last_block.
      */
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         last_block = block;
         if (block->max_length < new_block->max_length) {
             break;
@@ -2056,7 +2078,7 @@ void qemu_ram_remap(ram_addr_t addr, ram_addr_t length)
     int flags;
     void *area, *vaddr;
 
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         offset = addr - block->offset;
         if (offset < block->max_length) {
             vaddr = ramblock_ptr(block, offset);
@@ -2202,7 +2224,7 @@ RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset,
         goto found;
     }
 
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         /* This case append when the block is not mapped. */
         if (block->host == NULL) {
             continue;
@@ -2235,7 +2257,7 @@ RAMBlock *qemu_ram_block_by_name(const char *name)
 {
     RAMBlock *block;
 
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         if (!strcmp(name, block->idstr)) {
             return block;
         }
@@ -3459,7 +3481,7 @@ int qemu_ram_foreach_block(RAMBlockIterFunc func, void *opaque)
     int ret = 0;
 
     rcu_read_lock();
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         ret = func(block->idstr, block->host, block->offset,
                    block->used_length, opaque);
         if (ret) {

hmp-commands-info.hx

@@ -785,6 +785,20 @@ STEXI
 @item info dump
 @findex dump
 Display the latest dump status.
+ETEXI
+
+    {
+        .name       = "ramblock",
+        .args_type  = "",
+        .params     = "",
+        .help       = "Display system ramblock information",
+        .cmd        = hmp_info_ramblock,
+    },
+
+STEXI
+@item info ramblock
+@findex ramblock
+Dump all the ramblocks of the system.
 ETEXI
 
     {

hmp.c

@@ -39,6 +39,7 @@
 #include "qemu-io.h"
 #include "qemu/cutils.h"
 #include "qemu/error-report.h"
+#include "exec/ramlist.h"
 #include "hw/intc/intc.h"
 
 #ifdef CONFIG_SPICE
@@ -2743,6 +2744,11 @@ void hmp_info_dump(Monitor *mon, const QDict *qdict)
     qapi_free_DumpQueryResult(result);
 }
 
+void hmp_info_ramblock(Monitor *mon, const QDict *qdict)
+{
+    ram_block_dump(mon);
+}
+
 void hmp_hotpluggable_cpus(Monitor *mon, const QDict *qdict)
 {
     Error *err = NULL;

hmp.h

@@ -140,6 +140,7 @@ void hmp_rocker_ports(Monitor *mon, const QDict *qdict);
 void hmp_rocker_of_dpa_flows(Monitor *mon, const QDict *qdict);
 void hmp_rocker_of_dpa_groups(Monitor *mon, const QDict *qdict);
 void hmp_info_dump(Monitor *mon, const QDict *qdict);
+void hmp_info_ramblock(Monitor *mon, const QDict *qdict);
 void hmp_hotpluggable_cpus(Monitor *mon, const QDict *qdict);
 void hmp_info_vm_generation_id(Monitor *mon, const QDict *qdict);
 

include/exec/ramlist.h

@@ -4,6 +4,7 @@
 #include "qemu/queue.h"
 #include "qemu/thread.h"
 #include "qemu/rcu.h"
+#include "qemu/rcu_queue.h"
 
 typedef struct RAMBlockNotifier RAMBlockNotifier;
 
@@ -54,6 +55,10 @@ typedef struct RAMList {
 } RAMList;
 extern RAMList ram_list;
 
+/* Should be holding either ram_list.mutex, or the RCU lock. */
+#define  RAMBLOCK_FOREACH(block)  \
+    QLIST_FOREACH_RCU(block, &ram_list.blocks, next)
+
 void qemu_mutex_lock_ramlist(void);
 void qemu_mutex_unlock_ramlist(void);
 
@@ -68,5 +73,6 @@ void ram_block_notifier_remove(RAMBlockNotifier *n);
 void ram_block_notify_add(void *host, size_t size);
 void ram_block_notify_remove(void *host, size_t size);
 
+void ram_block_dump(Monitor *mon);
 
 #endif /* RAMLIST_H */

include/qemu-common.h

@@ -145,6 +145,7 @@ void qemu_hexdump(const char *buf, FILE *fp, const char *prefix, size_t size);
 int parse_debug_env(const char *name, int max, int initial);
 
 const char *qemu_ether_ntoa(const MACAddr *mac);
+char *size_to_str(uint64_t val);
 void page_size_init(void);
 
 /* returns non-zero if dump is in progress, otherwise zero is

migration/ram.c

@@ -655,7 +655,7 @@ uint64_t ram_pagesize_summary(void)
     RAMBlock *block;
     uint64_t summary = 0;
 
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         summary |= block->page_size;
     }
 
@@ -683,7 +683,7 @@ static void migration_bitmap_sync(RAMState *rs)
 
     qemu_mutex_lock(&rs->bitmap_mutex);
     rcu_read_lock();
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         migration_bitmap_sync_range(rs, block, 0, block->used_length);
     }
     rcu_read_unlock();
@@ -1415,8 +1415,9 @@ uint64_t ram_bytes_total(void)
     uint64_t total = 0;
 
     rcu_read_lock();
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next)
+    RAMBLOCK_FOREACH(block) {
         total += block->used_length;
+    }
     rcu_read_unlock();
     return total;
 }
@@ -1507,7 +1508,7 @@ void ram_postcopy_migrated_memory_release(MigrationState *ms)
 {
     struct RAMBlock *block;
 
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         unsigned long *bitmap = block->bmap;
         unsigned long range = block->used_length >> TARGET_PAGE_BITS;
         unsigned long run_start = find_next_zero_bit(bitmap, range, 0);
@@ -1585,7 +1586,7 @@ static int postcopy_each_ram_send_discard(MigrationState *ms)
     struct RAMBlock *block;
     int ret;
 
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         PostcopyDiscardState *pds =
             postcopy_discard_send_init(ms, block->idstr);
 
@@ -1968,7 +1969,7 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
 
     qemu_put_be64(f, ram_bytes_total() | RAM_SAVE_FLAG_MEM_SIZE);
 
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         qemu_put_byte(f, strlen(block->idstr));
         qemu_put_buffer(f, (uint8_t *)block->idstr, strlen(block->idstr));
         qemu_put_be64(f, block->used_length);

qapi/string-output-visitor.c

@@ -211,10 +211,8 @@ static void print_type_size(Visitor *v, const char *name, uint64_t *obj,
                             Error **errp)
 {
     StringOutputVisitor *sov = to_sov(v);
-    static const char suffixes[] = { 'B', 'K', 'M', 'G', 'T', 'P', 'E' };
+    uint64_t val;
-    uint64_t div, val;
+    char *out, *psize;
-    char *out;
-    int i;
 
     if (!sov->human) {
         out = g_strdup_printf("%"PRIu64, *obj);
@@ -223,19 +221,11 @@ static void print_type_size(Visitor *v, const char *name, uint64_t *obj,
     }
 
     val = *obj;
-
+    psize = size_to_str(val);
-    /* The exponent (returned in i) minus one gives us
+    out = g_strdup_printf("%"PRIu64" (%s)", val, psize);
-     * floor(log2(val * 1024 / 1000).  The correction makes us
-     * switch to the higher power when the integer part is >= 1000.
-     */
-    frexp(val / (1000.0 / 1024.0), &i);
-    i = (i - 1) / 10;
-    assert(i < ARRAY_SIZE(suffixes));
-    div = 1ULL << (i * 10);
-
-    out = g_strdup_printf("%"PRIu64" (%0.3g %c%s)", val,
-                          (double)val/div, suffixes[i], i ? "iB" : "");
     string_output_set(sov, out);
+
+    g_free(psize);
 }
 
 static void print_type_bool(Visitor *v, const char *name, bool *obj,

util/cutils.c

@@ -619,3 +619,28 @@ const char *qemu_ether_ntoa(const MACAddr *mac)
 
     return ret;
 }
+
+/*
+ * Return human readable string for size @val.
+ * @val can be anything that uint64_t allows (no more than "16 EiB").
+ * Use IEC binary units like KiB, MiB, and so forth.
+ * Caller is responsible for passing it to g_free().
+ */
+char *size_to_str(uint64_t val)
+{
+    static const char *suffixes[] = { "", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei" };
+    unsigned long div;
+    int i;
+
+    /*
+     * The exponent (returned in i) minus one gives us
+     * floor(log2(val * 1024 / 1000).  The correction makes us
+     * switch to the higher power when the integer part is >= 1000.
+     * (see e41b509d68afb1f for more info)
+     */
+    frexp(val / (1000.0 / 1024.0), &i);
+    i = (i - 1) / 10;
+    div = 1ULL << (i * 10);
+
+    return g_strdup_printf("%0.3g %sB", (double)val / div, suffixes[i]);
+}