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Priyankar Jain 1d9fa7a859 dbus-vmstate: Increase the size of input stream buffer used during load 
This commit fixes an issue where migration is failing in the load phase
because of a false alarm about data unavailability.

Following is the error received when the amount of data to be transferred
exceeds the default buffer size setup by G_BUFFERED_INPUT_STREAM(4KiB),
even when the maximum data size supported by this backend is 1MiB
(DBUS_VMSTATE_SIZE_LIMIT):

  dbus_vmstate_post_load: Invalid vmstate size: 4364
  qemu-kvm: error while loading state for instance 0x0 of device 'dbus-vmstate/dbus-vmstate'

This commit sets the size of the input stream buffer used during load to
DBUS_VMSTATE_SIZE_LIMIT which is the maximum amount of data a helper can
send during save phase.
Secondly, this commit makes sure that the input stream buffer is loaded before
checking the size of the data available in it, rectifying the false alarm about
data unavailability.

Fixes: 5010cec2bc ("Add dbus-vmstate object")
Signed-off-by: Priyankar Jain <priyankar.jain@nutanix.com>
Message-Id: <cdaad4718e62bf22fd5e93ef3e252de20da5c17c.1612273156.git.priyankar.jain@nutanix.com>
[ Modified printf format for gsize ]
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
 		2021-04-01 15:27:44 +04:00
..
tpm qdev: Rename qdev_get_prop_ptr() to object_field_prop_ptr() 2020-12-18 15:20:18 -05:00
Kconfig tpm: Move backend code under the 'backends/' directory 2020-06-19 07:25:55 -04:00
confidential-guest-support.c confidential guest support: Introduce new confidential guest support class 2021-02-08 16:57:37 +11:00
cryptodev-builtin.c cryptodev: Fix Lesser GPL version number 2020-10-27 16:48:49 +01:00
cryptodev-vhost-user.c cryptodev: Fix Lesser GPL version number 2020-10-27 16:48:49 +01:00
cryptodev-vhost.c cryptodev: Fix Lesser GPL version number 2020-10-27 16:48:49 +01:00
cryptodev.c cryptodev: Fix Lesser GPL version number 2020-10-27 16:48:49 +01:00
dbus-vmstate.c dbus-vmstate: Increase the size of input stream buffer used during load 2021-04-01 15:27:44 +04:00
hostmem-file.c hostmem: Don't report pmem attribute if unsupported 2021-02-18 18:34:47 -05:00
hostmem-memfd.c memory: alloc RAM from file at offset 2021-02-09 20:53:56 +00:00
hostmem-ram.c machine: alias -mem-path and -mem-prealloc into memory-foo backend 2020-02-19 16:49:53 +00:00
hostmem.c machine: add missing doc for memory-backend option 2021-02-08 14:43:54 +01:00
meson.build confidential guest support: Introduce new confidential guest support class 2021-02-08 16:57:37 +11:00
rng-builtin.c replay: rng-builtin support 2021-02-08 15:15:32 +01:00
rng-egd.c rng-egd: Register "chardev" as class property 2020-10-13 15:56:30 -04:00
rng-random.c rng-random: register "filename" as class property 2020-10-13 15:56:30 -04:00
rng.c rng: Register "opened" as class property 2020-10-13 15:56:30 -04:00
trace-events Add dbus-vmstate object 2020-01-06 18:41:32 +04:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00
vhost-user.c vhost-user: Register "chardev" as class property 2020-10-13 15:56:30 -04:00