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VFIO fixes 2018-08-23 

- Fix coverity reported issue with use of realpath (Alex Williamson)
 
  - Cleanup file descriptor in error path (Alex Williamson)
 
  - Fix postcopy use of new balloon inhibitor (Alex Williamson)
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Merge remote-tracking branch 'remotes/awilliam/tags/vfio-fixes-20180823.1' into staging

VFIO fixes 2018-08-23

 - Fix coverity reported issue with use of realpath (Alex Williamson)

 - Cleanup file descriptor in error path (Alex Williamson)

 - Fix postcopy use of new balloon inhibitor (Alex Williamson)

# gpg: Signature made Thu 23 Aug 2018 17:46:41 BST
# gpg:                using RSA key 239B9B6E3BB08B22
# gpg: Good signature from "Alex Williamson <alex.williamson@redhat.com>"
# gpg:                 aka "Alex Williamson <alex@shazbot.org>"
# gpg:                 aka "Alex Williamson <alwillia@redhat.com>"
# gpg:                 aka "Alex Williamson <alex.l.williamson@gmail.com>"
# Primary key fingerprint: 42F6 C04E 540B D1A9 9E7B  8A90 239B 9B6E 3BB0 8B22

* remotes/awilliam/tags/vfio-fixes-20180823.1:
  postcopy: Synchronize usage of the balloon inhibitor
  vfio/pci: Fix failure to close file descriptor on error
  vfio/pci: Handle subsystem realpath() returning NULL

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2018-08-25 10:59:06 +01:00
parent cc9821fa9a 154304cd6e
commit 17182bb47f
3 changed files with 18 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
hw/vfio/common.c
View File

@ -1432,6 +1432,7 @@ int vfio_get_device(VFIOGroup *group, const char *name,
if (!QLIST_EMPTY(&group->device_list)) {
error_setg(errp,
"Inconsistent device balloon setting within group");
close(fd);
return -1;
}

2
hw/vfio/pci.c
View File

@ -2879,7 +2879,7 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
tmp = g_strdup_printf("%s/subsystem", vdev->vbasedev.sysfsdev);
subsys = realpath(tmp, NULL);
g_free(tmp);
is_mdev = (strcmp(subsys, "/sys/bus/mdev") == 0);
is_mdev = subsys && (strcmp(subsys, "/sys/bus/mdev") == 0);
free(subsys);
trace_vfio_mdev(vdev->vbasedev.name, is_mdev);

18
migration/postcopy-ram.c
View File

@ -509,6 +509,20 @@ int postcopy_ram_incoming_init(MigrationIncomingState *mis)
return 0;
}
/*
* Manage a single vote to the QEMU balloon inhibitor for all postcopy usage,
* last caller wins.
*/
static void postcopy_balloon_inhibit(bool state)
{
static bool cur_state = false;
if (state != cur_state) {
qemu_balloon_inhibit(state);
cur_state = state;
}
}
/*
* At the end of a migration where postcopy_ram_incoming_init was called.
*/
@ -539,7 +553,7 @@ int postcopy_ram_incoming_cleanup(MigrationIncomingState *mis)
mis->have_fault_thread = false;
}
qemu_balloon_inhibit(false);
postcopy_balloon_inhibit(false);
if (enable_mlock) {
if (os_mlock() < 0) {
@ -1109,7 +1123,7 @@ int postcopy_ram_enable_notify(MigrationIncomingState *mis)
* Ballooning can mark pages as absent while we're postcopying
* that would cause false userfaults.
*/
qemu_balloon_inhibit(true);
postcopy_balloon_inhibit(true);
trace_postcopy_ram_enable_notify();