Merge tag 'pull-ppc-20220526' of https://gitlab.com/danielhb/qemu into staging

ppc patch queue for 2022-05-26:

Most of the changes are enhancements/fixes made in TCG ppc emulation
code. Several bugs fixes were made across the board as well.

Changes include:

- tcg and target/ppc: VSX MMA implementation, fixes in helper
declarations to use call flags, memory ordering, tlbie and others
- pseries: fixed stdout-path setting with -machine graphics=off
- pseries: allow use of elf parser for kernel address
- other assorted fixes and improvements

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# gpg: Signature made Thu 26 May 2022 02:35:58 PM PDT
# gpg:                using EDDSA key 17EBFF9923D01800AF2838193CD9CA96DE033164
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* tag 'pull-ppc-20220526' of https://gitlab.com/danielhb/qemu: (34 commits)
  linux-user: Add PowerPC ISA 3.1 and MMA to hwcap
  target/ppc: Implemented [pm]xvbf16ger2*
  target/ppc: Implemented pmxvf*ger*
  target/ppc: Implemented xvf16ger*
  target/ppc: Implemented xvf*ger*
  target/ppc: Implemented pmxvi*ger* instructions
  target/ppc: Implemented xvi*ger* instructions
  target/ppc: Implement xxm[tf]acc and xxsetaccz
  target/ppc: Implement lwsync with weaker memory ordering
  tcg/ppc: Optimize memory ordering generation with lwsync
  tcg/ppc: ST_ST memory ordering is not provided with eieio
  target/ppc: Fix eieio memory ordering semantics
  target/ppc: declare vmsumsh[ms] helper with call flags
  target/ppc: declare vmsumuh[ms] helper with call flags
  target/ppc: declare vmsum[um]bm helpers with call flags
  target/ppc: introduce do_va_helper
  target/ppc: declare xxextractuw and xxinsertw helpers with call flags
  target/ppc: declare xvxsigsp helper with call flags
  target/ppc: declare xscvspdpn helper with call flags
  target/ppc: Use TCG_CALL_NO_RWG_SE in fsel helper
  ...

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/docs/system/ppc/pseries.rst b/docs/system/ppc/pseries.rst
index d9b65ad4e8..3e1bbe6726 100644
--- a/docs/system/ppc/pseries.rst
+++ b/docs/system/ppc/pseries.rst
@@ -32,14 +32,43 @@ Missing devices
 Firmware
 ========
 
+The pSeries platform in QEMU comes with 2 firmwares:
+
 `SLOF <https://github.com/aik/SLOF>`_ (Slimline Open Firmware) is an
 implementation of the `IEEE 1275-1994, Standard for Boot (Initialization
 Configuration) Firmware: Core Requirements and Practices
 <https://standards.ieee.org/standard/1275-1994.html>`_.
 
+SLOF performs bus scanning, PCI resource allocation, provides the client
+interface to boot from block devices and network.
+
 QEMU includes a prebuilt image of SLOF which is updated when a more recent
 version is required.
 
+VOF (Virtual Open Firmware) is a minimalistic firmware to work with
+``-machine pseries,x-vof=on``. When enabled, the firmware acts as a slim
+shim and QEMU implements parts of the IEEE 1275 Open Firmware interface.
+
+VOF does not have device drivers, does not do PCI resource allocation and
+relies on ``-kernel`` used with Linux kernels recent enough (v5.4+)
+to PCI resource assignment. It is ideal to use with petitboot.
+
+Booting via ``-kernel`` supports the following:
+
++-------------------+-------------------+------------------+
+| kernel            | pseries,x-vof=off | pseries,x-vof=on |
++===================+===================+==================+
+| vmlinux BE        |     ✓             |     ✓            |
++-------------------+-------------------+------------------+
+| vmlinux LE        |     ✓             |     ✓            |
++-------------------+-------------------+------------------+
+| zImage.pseries BE |     x             |     ✓¹           |
++-------------------+-------------------+------------------+
+| zImage.pseries LE |     ✓             |     ✓            |
++-------------------+-------------------+------------------+
+
+¹ must set kernel-addr=0
+
 Build directions
 ================