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+.. _skiboot-6.3.1:
+
+==============
+skiboot-6.3.1
+==============
+
+skiboot 6.3.1 was released on Friday May 10th, 2019. It replaces
+:ref:`skiboot-6.3` as the current stable release in the 6.3.x series.
+
+It is recommended that 6.3.1 be used instead of 6.3 version
+due to the bug fixes it contains.
+
+Bug fixes included in this release are:
+
+- platforms/astbmc: Check for SBE validation step
+
+  On some POWER8 astbmc systems an update to the SBE requires pausing at
+  runtime to ensure integrity of the SBE. If this is required the BMC will
+  set a chassis boot option IPMI flag using the OEM parameter 0x62. If
+  Skiboot sees this flag is set it waits until the SBE update is complete
+  and the flag is cleared.
+  Unfortunately the mystery operation that validates the SBE also leaves
+  it in a bad state and unable to be used for timer operations. To
+  workaround this the flag is checked as soon as possible (ie. when IPMI
+  and the console are set up), and once complete the system is rebooted.
+
+- ipmi: ensure forward progress on ipmi_queue_msg_sync()
+
+  BT responses are handled using a timer doing the polling. To hope to
+  get an answer to an IPMI synchronous message, the timer needs to run.
+
+  We can't just check all timers though as there may be a timer that
+  wants a lock that's held by a code path calling ipmi_queue_msg_sync(),
+  and if we did enforce that as a requirement, it's a pretty subtle
+  API that is asking to be broken.
+
+  So, if we just run a poll function to crank anything that the IPMI
+  backend needs, then we should be fine.
+
+  This issue shows up very quickly under QEMU when loading the first
+  flash resource with the IPMI HIOMAP backend.
+
+- pci/iov: Remove skiboot VF tracking
+
+  This feature was added a few years ago in response to a request to make
+  the MaxPayloadSize (MPS) field of a Virtual Function match the MPS of the
+  Physical Function that hosts it.
+
+  The SR-IOV specification states the the MPS field of the VF is "ResvP".
+  This indicates the VF will use whatever MPS is configured on the PF and
+  that the field should be treated as a reserved field in the config space
+  of the VF. In other words, a SR-IOV spec compliant VF should always return
+  zero in the MPS field.  Adding hacks in OPAL to make it non-zero is...
+  misguided at best.
+
+  Additionally, there is a bug in the way pci_device structures are handled
+  by VFs that results in a crash on fast-reboot that occurs if VFs are
+  enabled and then disabled prior to rebooting. This patch fixes the bug by
+  removing the code entirely. This patch has no impact on SR-IOV support on
+  the host operating system.