Merge remote-tracking branch 'remotes/bonzini/tags/for-upstream' into staging

* xsetbv fix (x86 targets TCG)
* remove unused functions
* qht segfault and memory leak fixes
* NBD fixes
* Fix for non-power-of-2 discard granularity
* Memory hotplug fixes
* Migration regressions
* IOAPIC fixes and (disabled by default) EOI register support
* Various other small fixes

# gpg: Signature made Wed 03 Aug 2016 18:01:05 BST
# gpg:                using RSA key 0xBFFBD25F78C7AE83
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>"
# gpg:                 aka "Paolo Bonzini <pbonzini@redhat.com>"
# Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4  E2F7 7E15 100C CD36 69B1
#      Subkey fingerprint: F133 3857 4B66 2389 866C  7682 BFFB D25F 78C7 AE83

* remotes/bonzini/tags/for-upstream: (25 commits)
  util: Fix assertion in iov_copy() upon zero 'bytes' and non-zero 'offset'
  qdev: Fix use after free in qdev_init_nofail error path
  Reorganize help output of '-display' option
  x86: ioapic: add support for explicit EOI
  x86: ioapic: ignore level irq during processing
  apic: fix broken migration for kvm-apic
  fw_cfg: Make base type "fw_cfg" abstract
  block: Cater to iscsi with non-power-of-2 discard
  osdep: Document differences in rounding macros
  nbd: Limit nbdflags to 16 bits
  nbd: Fix bad flag detection on server
  i2c: fix migration regression introduced by broadcast support
  mptsas: really fix migration compatibility
  qdist: return "(empty)" instead of NULL when printing an empty dist
  qdist: use g_renew and g_new instead of g_realloc and g_malloc.
  qdist: fix memory leak during binning
  target-i386: fix typo in xsetbv implementation
  qht: do not segfault when gathering stats from an uninitialized qht
  util: Drop inet_listen()
  util: drop unix_nonblocking_connect()
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 15 insertions, 13 deletions

diff --git a/nbd/client.c b/nbd/client.c
index 78a7195c45..a92f1e2275 100644
--- a/nbd/client.c
+++ b/nbd/client.c
@@ -408,7 +408,7 @@ static QIOChannel *nbd_receive_starttls(QIOChannel *ioc,
 }
 
 
-int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint32_t *flags,
+int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint16_t *flags,
                           QCryptoTLSCreds *tlscreds, const char *hostname,
                           QIOChannel **outioc,
                           off_t *size, Error **errp)
@@ -468,7 +468,6 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint32_t *flags,
         uint32_t opt;
         uint32_t namesize;
         uint16_t globalflags;
-        uint16_t exportflags;
         bool fixedNewStyle = false;
 
         if (read_sync(ioc, &globalflags, sizeof(globalflags)) !=
@@ -477,7 +476,6 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint32_t *flags,
             goto fail;
         }
         globalflags = be16_to_cpu(globalflags);
-        *flags = globalflags << 16;
         TRACE("Global flags are %" PRIx32, globalflags);
         if (globalflags & NBD_FLAG_FIXED_NEWSTYLE) {
             fixedNewStyle = true;
@@ -545,17 +543,15 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint32_t *flags,
             goto fail;
         }
         *size = be64_to_cpu(s);
-        TRACE("Size is %" PRIu64, *size);
 
-        if (read_sync(ioc, &exportflags, sizeof(exportflags)) !=
-            sizeof(exportflags)) {
+        if (read_sync(ioc, flags, sizeof(*flags)) != sizeof(*flags)) {
             error_setg(errp, "Failed to read export flags");
             goto fail;
         }
-        exportflags = be16_to_cpu(exportflags);
-        *flags |= exportflags;
-        TRACE("Export flags are %" PRIx16, exportflags);
+        be16_to_cpus(flags);
     } else if (magic == NBD_CLIENT_MAGIC) {
+        uint32_t oldflags;
+
         if (name) {
             error_setg(errp, "Server does not support export names");
             goto fail;
@@ -572,16 +568,22 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint32_t *flags,
         *size = be64_to_cpu(s);
         TRACE("Size is %" PRIu64, *size);
 
-        if (read_sync(ioc, flags, sizeof(*flags)) != sizeof(*flags)) {
+        if (read_sync(ioc, &oldflags, sizeof(oldflags)) != sizeof(oldflags)) {
             error_setg(errp, "Failed to read export flags");
             goto fail;
         }
-        *flags = be32_to_cpu(*flags);
+        be32_to_cpus(&oldflags);
+        if (oldflags & ~0xffff) {
+            error_setg(errp, "Unexpected export flags %0x" PRIx32, oldflags);
+            goto fail;
+        }
+        *flags = oldflags;
     } else {
         error_setg(errp, "Bad magic received");
         goto fail;
     }
 
+    TRACE("Size is %" PRIu64 ", export flags %" PRIx16, *size, *flags);
     if (read_sync(ioc, &buf, 124) != 124) {
         error_setg(errp, "Failed to read reserved block");
         goto fail;
@@ -593,7 +595,7 @@ fail:
 }
 
 #ifdef __linux__
-int nbd_init(int fd, QIOChannelSocket *sioc, uint32_t flags, off_t size)
+int nbd_init(int fd, QIOChannelSocket *sioc, uint16_t flags, off_t size)
 {
     unsigned long sectors = size / BDRV_SECTOR_SIZE;
     if (size / BDRV_SECTOR_SIZE != sectors) {
@@ -689,7 +691,7 @@ int nbd_disconnect(int fd)
 }
 
 #else
-int nbd_init(int fd, QIOChannelSocket *ioc, uint32_t flags, off_t size)
+int nbd_init(int fd, QIOChannelSocket *ioc, uint16_t flags, off_t size)
 {
     return -ENOTSUP;
 }