skiboot v6.0.17 release notes

Signed-off-by: Stewart Smith <stewart@linux.ibm.com>

doc/release-notes/skiboot-6.0.17.rst

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+.. _skiboot-6.0.17:
+
+==============
+skiboot-6.0.17
+==============
+
+skiboot 6.0.17 was released on Wednesday February 20th, 2019. It replaces
+:ref:`skiboot-6.0.16` as the current stable release in the 6.0.x series.
+
+It is recommended that 6.0.17 be used instead of any previous 6.0.x version
+due to the bug fixes it contains.
+
+Bug fixes included in this release are:
+
+- core/opal: Print PIR value in exit path, which is useful for debugging.
+- core/ipmi: Improve error message
+- hdata: Fix dtc warnings
+
+  Fix dtc warnings related to mcbist node ::
+
+    Warning (reg_format): "reg" property in /xscom@623fc00000000/mcbist@1 has invalid length (4 bytes) (#address-cells == 1, #size-cells == 1)
+    Warning (reg_format): "reg" property in /xscom@623fc00000000/mcbist@2 has invalid length (4 bytes) (#address-cells == 1, #size-cells == 1)
+    Warning (reg_format): "reg" property in /xscom@603fc00000000/mcbist@1 has invalid length (4 bytes) (#address-cells == 1, #size-cells == 1)
+    Warning (reg_format): "reg" property in /xscom@603fc00000000/mcbist@2 has invalid length (4 bytes) (#address-cells == 1, #size-cells == 1)
+
+  Ideally we should add proper xscom range here... but we are not getting that
+  information in HDAT today. Lets fix warning until we get proper data in HDAT.
+- hdata/test: workaround dtc bugs
+
+  In dtc v1.4.5 to at least v1.4.7 there have been a few bugs introduced
+  that change the layout of what's produced in the dts. In order to be
+  immune from them, we should use the (provided) dtdiff utility, but we
+  also need to run the dts we're diffing against through a dtb cycle in
+  order to ensure we get the same format as what the hdat_to_dt to dts
+  conversion will.
+
+  This fixes a bunch of unit test failures on the version of dtc shipped
+  with recent Linux distros such as Fedora 29.
+- firmware-versions: Add test case for parsing VERSION
+
+  Also make it possible to use with afl-lop/afl-fuzz just to help make
+  *sure* we're all good.
+
+  Additionally, if we hit a entry in VERSION that is larger than our
+  buffer size, we skip over it gracefully rather than overwriting the
+  stack. This is only a problem if VERSION isn't trusted, which as of
+  4b8cc05a94513816d43fb8bd6178896b430af08f it is verified as part of
+  Secure Boot.
+- core/cpu: HID update race
+
+  If the per-core HID register is updated concurrently by multiple
+  threads, updates can get lost. This has been observed during fast
+  reboot where the HILE bit does not get cleared on all cores, which
+  can cause machine check exception interrupts to crash.
+
+  Fix this by only updating HID on thread0.
+- cpufeatures: Always advertise POWER8NVL as DD2
+
+  Despite the major version of PVR being 1 (0x004c0100) for POWER8NVL,
+  these chips are functionally equalent to P8/P8E DD2 levels.
+
+  This advertises POWER8NVL as DD2. As the result, skiboot adds
+  ibm,powerpc-cpu-features/processor-control-facility for such CPUs and
+  the linux kernel can use hypervisor doorbell messages to wake secondary
+  threads; otherwise "KVM: CPU %d seems to be stuck" would appear because
+  of missing LPCR_PECEDH.