migration: rename qemu_update_position to qemu_file_credit_transfer

The qemu_update_position method name gives the misleading impression
that it is changing the current file offset. Most of the files are
just streams, however, so there's no concept of a file offset in the
general case.

What this method is actually used for is to report on the number of
bytes that have been transferred out of band from the main I/O methods.
This new name better reflects this purpose.

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

migration: rename qemu_ftell to qemu_file_total_transferred

The name 'ftell' gives the misleading impression that the QEMUFile
objects are seekable. This is not the case, as in general we just
have an opaque stream. The users of this method are only interested
in the total bytes processed. This switches to a new name that
reflects the intended usage.

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
   dgilbert: Wrapped long line

migration: rename 'pos' field in QEMUFile to 'bytes_processed'

The field name 'pos' gives the misleading impression that the QEMUFile
objects are seekable. This is not the case, as in general we just
have an opaque stream. The users of this method are only interested
in the total bytes processed. This switches to a new name that
reflects the intended usage.

Every QIOChannel backed impl of QEMUFile is currently ignoring the
'pos' field.

The only QEMUFile impl using 'pos' as an offset for I/O is the block
device vmstate. A later patch is introducing a QIOChannel impl for the
vmstate, and to handle this it is tracking a file offset itself
internally to the QIOChannel impl. So when we later eliminate the
QEMUFileOps callbacks later, the 'pos' field will no longer be used
from any I/O read/write methods.

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
  dgilbert: Fixed long line

migration: rename rate limiting fields in QEMUFile

This renames the following QEMUFile fields

 * bytes_xfer -> rate_limit_used
 * xfer_limit -> rate_limit_max

The intent is to make it clear that 'bytes_xfer' is specifically related
to rate limiting of data and applies to data queued, which need not have
been transferred on the wire yet if a flush hasn't taken place.

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

migration: remove unreachble RDMA code in save_hook impl

The QEMUFile 'save_hook' callback has a 'size_t size' parameter.

The RDMA impl of this has logic that takes different actions
depending on whether the value is zero or non-zero. It has
commented out logic that would have taken further actions
if the value was negative.

The only place where the 'save_hook' callback is invoked is
the ram_control_save_page() method, which passes 'size'
through from its caller. The only caller of this method is
in turn control_save_page(). This method unconditionally
passes the 'TARGET_PAGE_SIZE' constant for the 'size' parameter.

IOW, the only scenario for 'size' that can execute in the
qemu_rdma_save_page method is 'size > 0'. The remaining code
has been unreachable since RDMA support was first introduced
9 years ago.

Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

migration: switch to use QIOChannelNull for dummy channel

This removes one further custom impl of QEMUFile, in favour of a
QIOChannel based impl.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

io: add a QIOChannelNull equivalent to /dev/null

This is for code which needs a portable equivalent to a QIOChannelFile
connected to /dev/null.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

migration: Change zero_copy_send from migration parameter to migration capability

When originally implemented, zero_copy_send was designed as a Migration
paramenter.

But taking into account how is that supposed to work, and how
the difference between a capability and a parameter, it only makes sense
that zero-copy-send would work better as a capability.

Taking into account how recently the change got merged, it was decided
that it's still time to make it right, and convert zero_copy_send into
a Migration capability.

Signed-off-by: Leonardo Bras <leobras@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Acked-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
  dgilbert: always define the capability, even on non-Linux but error if
set; avoids build problems with the capability

QIOChannelSocket: Fix zero-copy send so socket flush works

Somewhere between v6 and v7 the of the zero-copy-send patchset a crucial
part of the flushing mechanism got missing: incrementing zero_copy_queued.

Without that, the flushing interface becomes a no-op, and there is no
guarantee the buffer is really sent.

This can go as bad as causing a corruption in RAM during migration.

Fixes: 2bc58ffc2926 ("QIOChannelSocket: Implement io_writev zero copy flag & io_flush for CONFIG_LINUX")
Reported-by: 徐闯 <xuchuangxclwt@bytedance.com>
Signed-off-by: Leonardo Bras <leobras@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

QIOChannelSocket: Introduce assert and reduce ifdefs to improve readability

During implementation of MSG_ZEROCOPY feature, a lot of #ifdefs were
introduced, particularly at qio_channel_socket_writev().

Rewrite some of those changes so it's easier to read.

Also, introduce an assert to help detect incorrect zero-copy usage is when
it's disabled on build.

Signed-off-by: Leonardo Bras <leobras@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
  dgilbert: Fixed up thinko'd g_assert_unreachable->g_assert_not_reached

migration: Remove RDMA_UNREGISTRATION_EXAMPLE

Nobody has ever showed up to unregister individual pages, and another
set of patches written by Daniel P. Berrangé <berrange@redhat.com>
just remove qemu_rdma_signal_unregister() function needed here.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

Merge tag 'pull-aspeed-20220622' of https://github.com/legoater/qemu into staging

aspeed queue:

* Extra avocado tests using buildroot images
* Conversion of the I2C model to the registerfield interface
* Support for the I2C new register interface on AST2600
* Various I2C enhancements
* I2C support for the AST1030
* Improvement of the Aspeed SMC and m25p80 qtest

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# =OsUe
# -----END PGP SIGNATURE-----
# gpg: Signature made Wed 22 Jun 2022 01:00:38 AM PDT
# gpg:                using RSA key A0F66548F04895EBFE6B0B6051A343C7CFFBECA1
# gpg: Good signature from "Cédric Le Goater <clg@kaod.org>" [undefined]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: A0F6 6548 F048 95EB FE6B  0B60 51A3 43C7 CFFB ECA1

* tag 'pull-aspeed-20220622' of https://github.com/legoater/qemu:
  hw: m25p80: fixing individual test failure when tests are running in isolation
  aspeed/hace: Add missing newlines to unimp messages
  aspeed/i2c: Enable SLAVE_ADDR_RX_MATCH always
  hw/i2c/aspeed: add DEV_ADDR in old register mode
  hw/i2c/aspeed: rework raise interrupt trace event
  aspeed: Add I2C buses to AST1030 model
  aspeed/i2c: Add ast1030 controller models
  aspeed: i2c: Move regs and helpers to header file
  aspeed: i2c: Add PKT_DONE IRQ to trace
  aspeed: i2c: Add new mode support
  aspeed: i2c: Use reg array instead of individual vars
  aspeed: i2c: Migrate to registerfields API
  hw/registerfields: Add shared fields macros
  test/avocado/machine_aspeed.py: Add an I2C RTC test
  test/avocado/machine_aspeed.py: Add I2C tests to ast2600-evb
  test/avocado/machine_aspeed.py: Add I2C tests to ast2500-evb
  test/avocado/machine_aspeed.py: Add tests using buildroot images
  test/avocado/machine_aspeed.py: Move OpenBMC tests
  aspeed: Remove fake RTC device on ast2500-evb

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

hw: m25p80: fixing individual test failure when tests are running in isolation

Signed-off-by: Iris Chen <irischenlj@fb.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

aspeed/hace: Add missing newlines to unimp messages

Signed-off-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

aspeed/i2c: Enable SLAVE_ADDR_RX_MATCH always

There is no 'slave match interrupt' enable bit in the Interrupt
Control Register. Consider it is always enabled and extend the mask
value 'bus->regs[intr_ctrl_reg]' with the SLAVE_ADDR_RX_MATCH bit when
the interrupt is raised.

Signed-off-by: Cédric Le Goater <clg@kaod.org>

hw/i2c/aspeed: add DEV_ADDR in old register mode

Add support for writing and reading the device address register in old
register mode.

On the AST2400 (only 1 slave address)

  * no upper bits

On the AST2500 (2 possible slave addresses),

  * bit[31] : Slave Address match indicator
  * bit[30] : Slave Address Receiving pending

On the AST2600 (3 possible slave addresses),

  * bit[31-30] : Slave Address match indicator
  * bit[29] : Slave Address Receiving pending

The model could be more precise to take into account all fields but
since the Linux driver is masking the register value being set, it
should be fine. See commit 3fb2e2aeafb2 ("i2c: aspeed: disable
additional device addresses on ast2[56]xx") from Zeiv. This can be
addressed later.

Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
[ clg: add details to commit log ]
Message-Id: <20220601210831.67259-3-its@irrelevant.dk>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

hw/i2c/aspeed: rework raise interrupt trace event

Build a single string instead of having several parameters on the trace
event.

Suggested-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
[ clg: simplified trace buffer creation ]
Message-Id: <20220601210831.67259-2-its@irrelevant.dk>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

aspeed: Add I2C buses to AST1030 model

Instantiate the I2C buses in AST1030 model and create two slave device
for ast1030-evb.

Signed-off-by: Troy Lee <troy_lee@aspeedtech.com>
Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
Signed-off-by: Steven Lee <steven_lee@aspeedtech.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
[ clg : - adapted to current AST1030 upstream models
        - changed AST2600 to AST1030 in comment
        - fixed typo in commit log ]
Message-Id: <20220324100439.478317-3-troy_lee@aspeedtech.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

aspeed/i2c: Add ast1030 controller models

Based on :

  https://lore.kernel.org/qemu-devel/20220324100439.478317-2-troy_lee@aspeedtech.com/

Cc: Troy Lee <troy_lee@aspeedtech.com>
Cc: Jamin Lin <jamin_lin@aspeedtech.com>
Cc: Steven Lee <steven_lee@aspeedtech.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

aspeed: i2c: Move regs and helpers to header file

Moves register definitions and short commonly used inlined functiosn to
the header file to help tidy up the implementation file.

Signed-off-by: Joe Komlodi <komlodi@google.com>
Change-Id: I34dff7485b6bbe3c9482715ccd94dbd65dc5f324
Message-Id: <20220331043248.2237838-8-komlodi@google.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

aspeed: i2c: Add PKT_DONE IRQ to trace

Signed-off-by: Joe Komlodi <komlodi@google.com>
Change-Id: I566eb09f4b9016e24570572f367627f6594039f5
Message-Id: <20220331043248.2237838-7-komlodi@google.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

aspeed: i2c: Add new mode support

On AST2600, I2C has a secondary mode, called "new mode", which changes
the layout of registers, adds some minor behavior changes, and
introduces a new way to transfer data called "packet mode".

Most of the bit positions of the fields are the same between old and new
mode, so we use SHARED_FIELD_XX macros to reuse most of the code between
the different modes.

For packet mode, most of the command behavior is the same compared to
other modes, but there are some minor changes to how interrupts are
handled compared to other modes.

Signed-off-by: Joe Komlodi <komlodi@google.com>
Change-Id: I072f8301964f623afc74af1fe50c12e5caef199e
Message-Id: <20220331043248.2237838-6-komlodi@google.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

aspeed: i2c: Use reg array instead of individual vars

Using a register array will allow us to represent old-mode and new-mode
I2C registers by using the same underlying register array, instead of
adding an entire new set of variables to represent new mode.

As part of this, we also do additional cleanup to use ARRAY_FIELD_
macros instead of FIELD_ macros on registers.

Signed-off-by: Joe Komlodi <komlodi@google.com>
Change-Id: Ib94996b17c361b8490c042b43c99d8abc69332e3
[ clg: use of memset in aspeed_i2c_bus_reset() ]
Message-Id: <20220331043248.2237838-5-komlodi@google.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

aspeed: i2c: Migrate to registerfields API

This cleans up some of the field accessing, setting, and clearing
bitwise operations, and wraps them in macros instead.

Signed-off-by: Joe Komlodi <komlodi@google.com>
Change-Id: I33018d6325fa04376e7c29dc4a49ab389a8e333a
Message-Id: <20220331043248.2237838-4-komlodi@google.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

hw/registerfields: Add shared fields macros

Occasionally a peripheral will have different operating modes, where the
MMIO layout changes, but some of the register fields have the same offsets
and behaviors.

To help support this, we add SHARED_FIELD_XX macros that create SHIFT,
LENGTH, and MASK macros for the fields that are shared across registers,
and accessors for these fields.

An example use may look as follows:
There is a peripheral with registers REG_MODE1 and REG_MODE2 at
different addreses, and both have a field FIELD1 initialized by
SHARED_FIELD().

Depending on what mode the peripheral is operating in, the user could
extract FIELD1 via
SHARED_ARRAY_FIELD_EX32(s->regs, R_REG_MODE1, FIELD1)
or
SHARED_ARRAY_FIELD_EX32(s->regs, R_REG_MODE2, FIELD1)

Signed-off-by: Joe Komlodi <komlodi@google.com>
Change-Id: Id3dc53e7d2f8741c95697cbae69a81bb699fa3cb
Message-Id: <20220331043248.2237838-2-komlodi@google.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

test/avocado/machine_aspeed.py: Add an I2C RTC test

Add an RTC device and check that the output of the hwclock command
matches the current year.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

test/avocado/machine_aspeed.py: Add I2C tests to ast2600-evb

Create a named I2C temperature sensor device on the command line,
instantiate device from Linux since it is not part of the device tree,
and check the temperature is correctly reported under sysfs.

Signed-off-by: Cédric Le Goater <clg@kaod.org>

test/avocado/machine_aspeed.py: Add I2C tests to ast2500-evb

Create a named I2C temperature sensor device on the command line,
instantiate device from Linux since it is not part of the device tree,
and check the temperature is correctly reported under sysfs.

Signed-off-by: Cédric Le Goater <clg@kaod.org>

test/avocado/machine_aspeed.py: Add tests using buildroot images

Buildroot images are smaller than the OpenBMC images and faster to
run. Built from source using :

  http://patchwork.ozlabs.org/project/buildroot/list/?series=303465

Signed-off-by: Cédric Le Goater <clg@kaod.org>

test/avocado/machine_aspeed.py: Move OpenBMC tests

It's easier to run. Keep test_arm_ast2600_debian() under the
boot_linux_console.py file because it requires the extract_from_deb()
helper. We could remove it when we have tests for the AST2600.

Signed-off-by: Cédric Le Goater <clg@kaod.org>

aspeed: Remove fake RTC device on ast2500-evb

The board has no such device. It might have been useful for some tests
in the past, it's not anymore and the same can be achieved on the
command line.

Signed-off-by: Cédric Le Goater <clg@kaod.org>

Merge tag 'pull-tcg-20220621' of https://gitlab.com/rth7680/qemu into staging

Speed empty timer list in qemu_clock_deadline_ns_all.
Implement remainder for Power3.1 hosts.
Optimize ppc host icache flushing.
Cleanups to tcg_accel_ops_init.
Fix mmio crash accessing unmapped physical memory.

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# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>" [ultimate]

* tag 'pull-tcg-20220621' of https://gitlab.com/rth7680/qemu:
  util/cacheflush: Optimize flushing when ppc host has coherent icache
  util/cacheflush: Merge aarch64 ctr_el0 usage
  util: Merge cacheflush.c and cacheinfo.c
  softmmu: Always initialize xlat in address_space_translate_for_iotlb
  qemu-timer: Skip empty timer lists before locking in qemu_clock_deadline_ns_all
  accel/tcg: Reorganize tcg_accel_ops_init()
  accel/tcg: Init TCG cflags in vCPU thread handler
  target/avr: Drop avr_cpu_memory_rw_debug()
  tcg/ppc: implement rem[u]_i{32,64} with mod[su][wd]

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

util/cacheflush: Optimize flushing when ppc host has coherent icache

On linux, the AT_HWCAP bit PPC_FEATURE_ICACHE_SNOOP indicates
that we can use a simplified 3 instruction flush sequence.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-Id: <20220519141131.29839-1-npiggin@gmail.com>
[rth: update after merging cacheflush.c and cacheinfo.c]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20220621014837.189139-4-richard.henderson@linaro.org>

util/cacheflush: Merge aarch64 ctr_el0 usage

Merge init_ctr_el0 into arch_cache_info.  In flush_idcache_range,
use the pre-computed line sizes from the global variables.
Use CONFIG_DARWIN in preference to __APPLE__.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20220621014837.189139-3-richard.henderson@linaro.org>

util: Merge cacheflush.c and cacheinfo.c

Combine the two files into cacheflush.c.  There's a couple of bits
that would be helpful to share between the two, and combining them
seems better than exporting the bits.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20220621014837.189139-2-richard.henderson@linaro.org>

softmmu: Always initialize xlat in address_space_translate_for_iotlb

The bug is an uninitialized memory read, along the translate_fail
path, which results in garbage being read from iotlb_to_section,
which can lead to a crash in io_readx/io_writex.

The bug may be fixed by writing any value with zero
in ~TARGET_PAGE_MASK, so that the call to iotlb_to_section using
the xlat'ed address returns io_mem_unassigned, as desired by the
translate_fail path.

It is most useful to record the original physical page address,
which will eventually be logged by memory_region_access_valid
when the access is rejected by unassigned_mem_accepts.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1065
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20220621153829.366423-1-richard.henderson@linaro.org>

qemu-timer: Skip empty timer lists before locking in qemu_clock_deadline_ns_all

This decreases qemu_clock_deadline_ns_all's share from 23.2% to 13% in a
profile of icount-enabled aarch64-softmmu.

Signed-off-by: Idan Horowitz <idan.horowitz@gmail.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220114004358.299534-2-idan.horowitz@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

Merge tag 'pull-ppc-20220621' of https://gitlab.com/danielhb/qemu into staging

ppc patch queue for 2022-06-21:

- tcg and target/ppc: vector divide instructions and a vbpermd fix for
  BE hosts
- ppc440_uc.c: fix boot of sam460ex machine
- target/ppc: fix stop state on cpu reset
- xive2: Access direct mapped thread contexts from all chips
- a couple of Coverity fixes

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* tag 'pull-ppc-20220621' of https://gitlab.com/danielhb/qemu:
  target/ppc: cpu_init: Clean up stop state on cpu reset
  target/ppc: fix unreachable code in fpu_helper.c
  target/ppc: avoid int32 multiply overflow in int_helper.c
  ppc/pnv: fix extra indent spaces with DEFINE_PROP*
  pnv/xive2: Access direct mapped thread contexts from all chips
  target/ppc: fix vbpermd in big endian hosts
  ppc: fix boot with sam460ex
  target/ppc: Implemented vector module quadword
  target/ppc: Implemented vector module word/doubleword
  target/ppc: Implemented remaining vector divide extended
  host-utils: Implemented signed 256-by-128 division
  host-utils: Implemented unsigned 256-by-128 division
  target/ppc: Implemented vector divide extended word
  target/ppc: Implemented vector divide quadword
  target/ppc: Implemented vector divide instructions

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

accel/tcg: Reorganize tcg_accel_ops_init()

Reorg TCG AccelOpsClass initialization to emphasis icount
mode share more code with single-threaded TCG.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220323171751.78612-7-philippe.mathieu.daude@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

accel/tcg: Init TCG cflags in vCPU thread handler

Move TCG cflags initialization to thread handler.
Remove the duplicated assert checks.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20220323171751.78612-6-philippe.mathieu.daude@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

target/avr: Drop avr_cpu_memory_rw_debug()

CPUClass::memory_rw_debug() holds a callback for GDB memory access.
If not provided, cpu_memory_rw_debug() is used by the GDB stub.
Drop avr_cpu_memory_rw_debug() which does nothing special.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20220322095004.70682-1-bmeng.cn@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg/ppc: implement rem[u]_i{32,64} with mod[su][wd]

Power ISA v3.0 introduced mod[su][wd] insns that can be used to
implement rem[u]_i{32,64}.

Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

target/ppc: cpu_init: Clean up stop state on cpu reset

The 'resume_as_sreset' attribute of a cpu is set when a thread is
entering a stop state on ppc books. It causes the thread to be
re-routed to vector 0x100 when woken up by an exception. So it must be
cleared on reset or a thread might be re-routed unexpectedly after a
reset, when it was not in a stop state and/or when the appropriate
exception handler isn't set up yet.

Using skiboot, it can be tested by resetting the system when it is
quiet and most threads are idle and in stop state.

After the reset occurs, skiboot elects a primary thread and all the
others wait in secondary_wait. The primary thread does all the system
initialization from main_cpu_entry() and at some point, the
decrementer interrupt starts ticking. The exception vector for the
decrementer interrupt is in place, so that shouldn't be a
problem. However, if that primary thread was in stop state prior to
the reset, and because the resume_as_sreset parameters is still set,
it is re-routed to exception vector 0x100. Which, at that time, is
still defined as the entry point for BML. So that primary thread
restarts as new and ends up being treated like any other secondary
thread. All threads are now waiting in secondary_wait.

It results in a full system hang with no message on the console, as
the uart hasn't been init'ed yet. It's actually not obvious to realise
what's happening if not tracing reset (-d cpu_reset). The fix is
simply to clear the 'resume_as_sreset' attribute on reset.

Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20220617095222.612212-1-fbarrat@linux.ibm.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

target/ppc: fix unreachable code in fpu_helper.c

Commit c29018cc7395 added an env->fpscr OR operation using a ternary
that checks if 'error' is not zero:

    env->fpscr |= error ? FP_FEX : 0;

However, in the current body of do_fpscr_check_status(), 'error' is
granted to be always non-zero at that point. The result is that Coverity
is less than pleased:

  Control flow issues  (DEADCODE)
Execution cannot reach the expression "0ULL" inside this statement:
"env->fpscr |= (error ? 1073...".

Remove the ternary and always make env->fpscr |= FP_FEX.

Cc: Lucas Mateus Castro (alqotel) <lucas.araujo@eldorado.org.br>
Cc: Richard Henderson <richard.henderson@linaro.org>
Fixes: Coverity CID 1489442
Fixes: c29018cc7395 ("target/ppc: Implemented xvf*ger*")
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Lucas Mateus Castro (alqotel) <lucas.araujo@eldorado.org.br>
Message-Id: <20220602191048.137511-1-danielhb413@gmail.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

target/ppc: avoid int32 multiply overflow in int_helper.c

Coverity is not thrilled about the multiply operations being done in
ger_rank8() and ger_rank2(), giving an error like the following:

Integer handling issues  (OVERFLOW_BEFORE_WIDEN)
    Potentially overflowing expression "sextract32(a, 4 * i, 4) *
sextract32(b, 4 * i, 4)" with type "int" (32 bits, signed) is evaluated
using 32-bit arithmetic, and then used in a context that expects an
expression of type "int64_t" (64 bits, signed).

Fix both instances where this occur by adding an int64_t cast in the
first operand, forcing the result to be 64 bit.

Fixes: Coverity CID 1489444, 1489443
Fixes: 345531533f26 ("target/ppc: Implemented xvi*ger* instructions")
Cc: Lucas Mateus Castro (alqotel) <lucas.araujo@eldorado.org.br>
Cc: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Lucas Mateus Castro (alqotel) <lucas.araujo@eldorado.org.br>
Message-Id: <20220602141449.118173-1-danielhb413@gmail.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

ppc/pnv: fix extra indent spaces with DEFINE_PROP*

The DEFINE_PROP* macros in pnv files are using extra spaces for no good
reason.

Cc: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Message-Id: <20220602215351.149910-1-danielhb413@gmail.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

pnv/xive2: Access direct mapped thread contexts from all chips

When accessing a thread context through the IC BAR, the offset of the
page in the BAR identifies the CPU. From that offset, we can compute
the PIR (processor ID register) of the CPU to do the data structure
lookup. On P10, the current code assumes an access for node 0 when
computing the PIR. Everything is almost in place to allow access for
other nodes though. So this patch reworks how the PIR value is
computed so that we can access all thread contexts through the IC BAR.

The PIR is already correct on P9, so no need to modify anything there.

Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20220602165310.558810-1-fbarrat@linux.ibm.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

target/ppc: fix vbpermd in big endian hosts

The extract64 arguments are not endian dependent as they are only used
for bitwise operations. The current behavior in little-endian hosts is
correct; since the indexes in VRB are in PowerISA-ordering, we should
always invert the value before calling extract64. Also, using the VsrD
macro, we can have a single EXTRACT_BIT definition for big and
little-endian with the correct behavior.

Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220601125355.1266165-1-matheus.ferst@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

ppc: fix boot with sam460ex

Recent changes to pcie_host corrected size of its internal region to
match what it expects: only the low 28 bits are ever decoded. Previous
code just ignored bit 29 (if size was 1 << 29) in the address which does
not make much sense.  We are now asserting on size > 1 << 28 instead,
but PPC 4xx actually allows guest to configure different sizes, and some
firmwares seem to set it to 1 << 29.

This caused e.g. qemu-system-ppc -M sam460ex to exit with an assert when
the guest writes a value to CFGMSK register when trying to map config
space. This is done in the board firmware in ppc4xx_init_pcie_port() in
roms/u-boot-sam460ex/arch/powerpc/cpu/ppc4xx/4xx_pcie.c

It's not clear what the proper fix should be but for now let's force the
size to 256MB, so anything outside the expected address range is
ignored.

Fixes: commit 1f1a7b2269 ("include/hw/pci/pcie_host: Correct PCIE_MMCFG_SIZE_MAX")
Reviewed-by: BALATON Zoltan <balaton@eik.bme.hu>
Tested-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20220526224229.95183-1-mst@redhat.com>
[danielhb: changed commit msg as BALATON Zoltan suggested]
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

target/ppc: Implemented vector module quadword

Implement the following PowerISA v3.1 instructions:
vmodsq: Vector Modulo Signed Quadword
vmoduq: Vector Modulo Unsigned Quadword

Signed-off-by: Lucas Mateus Castro (alqotel) <lucas.araujo@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/744
Message-Id: <20220525134954.85056-9-lucas.araujo@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

target/ppc: Implemented vector module word/doubleword

Implement the following PowerISA v3.1 instructions:
vmodsw: Vector Modulo Signed Word
vmoduw: Vector Modulo Unsigned Word
vmodsd: Vector Modulo Signed Doubleword
vmodud: Vector Modulo Unsigned Doubleword

Signed-off-by: Lucas Mateus Castro (alqotel) <lucas.araujo@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220525134954.85056-8-lucas.araujo@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

target/ppc: Implemented remaining vector divide extended

Implement the following PowerISA v3.1 instructions:
vdivesd: Vector Divide Extended Signed Doubleword
vdiveud: Vector Divide Extended Unsigned Doubleword
vdivesq: Vector Divide Extended Signed Quadword
vdiveuq: Vector Divide Extended Unsigned Quadword

Signed-off-by: Lucas Mateus Castro (alqotel) <lucas.araujo@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220525134954.85056-7-lucas.araujo@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

host-utils: Implemented signed 256-by-128 division

Based on already existing QEMU implementation created a signed
256 bit by 128 bit division needed to implement the vector divide
extended signed quadword instruction from PowerISA 3.1

Signed-off-by: Lucas Mateus Castro (alqotel) <lucas.araujo@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220525134954.85056-6-lucas.araujo@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

host-utils: Implemented unsigned 256-by-128 division

Based on already existing QEMU implementation, created an unsigned 256
bit by 128 bit division needed to implement the vector divide extended
unsigned instruction from PowerISA3.1

Signed-off-by: Lucas Mateus Castro (alqotel) <lucas.araujo@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220525134954.85056-5-lucas.araujo@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

target/ppc: Implemented vector divide extended word

Implement the following PowerISA v3.1 instructions:
vdivesw: Vector Divide Extended Signed Word
vdiveuw: Vector Divide Extended Unsigned Word

Signed-off-by: Lucas Mateus Castro (alqotel) <lucas.araujo@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220525134954.85056-4-lucas.araujo@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

target/ppc: Implemented vector divide quadword

Implement the following PowerISA v3.1 instructions:
vdivsq: Vector Divide Signed Quadword
vdivuq: Vector Divide Unsigned Quadword

Signed-off-by: Lucas Mateus Castro (alqotel) <lucas.araujo@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220525134954.85056-3-lucas.araujo@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

target/ppc: Implemented vector divide instructions

Implement the following PowerISA v3.1 instructions:
vdivsw: Vector Divide Signed Word
vdivuw: Vector Divide Unsigned Word
vdivsd: Vector Divide Signed Doubleword
vdivud: Vector Divide Unsigned Doubleword

Signed-off-by: Lucas Mateus Castro (alqotel) <lucas.araujo@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220525134954.85056-2-lucas.araujo@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

Merge tag 'bsd-user-syscall-2022q2-pull-request' of ssh://github.com/qemu-bsd-user/qemu-bsd-user into staging

bsd-user: Next round of syscalls

Implement the next round of system calls. These are open, openat, close,
fdatasync, fsync, close_from, revoke, access, eacccess, facccessat, chdir,
fchdir, rename, renameat, mkdir, mkdirat, rmdir, _getcwd, dup, dup2, truncate,
ftruncate, acct and sync. In addition, the helper functions needed for these to
work are included. With the helper functions, all of these system calls are the
'obvious' wrapper...

# -----BEGIN PGP SIGNATURE-----
# Comment: GPGTools - https://gpgtools.org
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# -----END PGP SIGNATURE-----
# gpg: Signature made Sun 19 Jun 2022 11:04:28 AM PDT
# gpg:                using RSA key 2035F894B00AA3CF7CCDE1B76C1CD1287DB01100
# gpg: Good signature from "Warner Losh <wlosh@netflix.com>" [unknown]
# gpg:                 aka "Warner Losh <imp@bsdimp.com>" [unknown]
# gpg:                 aka "Warner Losh <imp@freebsd.org>" [unknown]
# gpg:                 aka "Warner Losh <imp@village.org>" [unknown]
# gpg:                 aka "Warner Losh <wlosh@bsdimp.com>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 2035 F894 B00A A3CF 7CCD  E1B7 6C1C D128 7DB0 1100

* tag 'bsd-user-syscall-2022q2-pull-request' of ssh://github.com/qemu-bsd-user/qemu-bsd-user:
  bsd-user: Implement acct and sync
  bsd-user: Implement trunctate and ftruncate
  bsd-user: Implement dup and dup2
  bsd-user: Implement rmdir and undocumented __getcwd
  bsd-user: Implement mkdir and mkdirat
  bsd-user: Implement link, linkat, unlink and unlinkat
  bsd-user: Implement rename and renameat
  bsd-user: Implement chdir and fchdir
  bsd-user: Implement revoke, access, eaccess and faccessat
  bsd-user: Implement fdatasync, fsync and close_from
  bsd-user: Implement open, openat and close

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

Merge tag 'for_upstream' of git://git./virt/kvm/mst/qemu into staging

virtio,pc,pci: fixes,cleanups,features

more CXL patches
RSA support for crypto
fixes, cleanups all over the place

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
# -----BEGIN PGP SIGNATURE-----
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# -----END PGP SIGNATURE-----
# gpg: Signature made Thu 16 Jun 2022 09:56:19 AM PDT
# gpg:                using RSA key 5D09FD0871C8F85B94CA8A0D281F0DB8D28D5469
# gpg:                issuer "mst@redhat.com"
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>" [undefined]
# gpg:                 aka "Michael S. Tsirkin <mst@redhat.com>" [undefined]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 0270 606B 6F3C DF3D 0B17  0970 C350 3912 AFBE 8E67
#      Subkey fingerprint: 5D09 FD08 71C8 F85B 94CA  8A0D 281F 0DB8 D28D 5469

* tag 'for_upstream' of git://git.kernel.org/pub/scm/virt/kvm/mst/qemu:
  acpi/erst: fix fallthrough code upon validation failure
  vhost: also check queue state in the vhost_dev_set_log error routine
  crypto: Introduce RSA algorithm
  virtio-iommu: Add an assert check in translate routine
  virtio-iommu: Use recursive lock to avoid deadlock
  virtio-iommu: Add bypass mode support to assigned device
  virtio/vhost-user: Fix wrong vhost notifier GPtrArray size
  docs/cxl: Add switch documentation
  pci-bridge/cxl_downstream: Add a CXL switch downstream port
  pci-bridge/cxl_upstream: Add a CXL switch upstream port

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

acpi/erst: fix fallthrough code upon validation failure

At any step when any validation fail in check_erst_backend_storage(), there is
no need to continue further through other validation checks. Further, by
continuing even when record_size is 0, we run the risk of triggering a divide
by zero error if we continued with other validation checks. Hence, we should
simply return from this function upon validation failure.

CC: Peter Maydell <peter.maydell@linaro.org>
CC: Eric DeVolder <eric.devolder@oracle.com>
Signed-off-by: Ani Sinha <ani@anisinha.ca>
Message-Id: <20220513141005.1929422-1-ani@anisinha.ca>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Eric DeVolder <eric.devolder@oracle.com>

vhost: also check queue state in the vhost_dev_set_log error routine

When check queue state in the vhost_dev_set_log routine, it miss the error
routine check, this patch also check queue state in error case.

Fixes: 1e5a050f5798 ("check queue state in the vhost_dev_set_log routine")
Signed-off-by: Ni Xun <richardni@tencent.com>
Reviewed-by: Zhigang Lu <tonnylu@tencent.com>
Message-Id: <OS0PR01MB57139163F3F3955960675B52EAA79@OS0PR01MB5713.jpnprd01.prod.outlook.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

crypto: Introduce RSA algorithm

There are two parts in this patch:
1, support akcipher service by cryptodev-builtin driver
2, virtio-crypto driver supports akcipher service

In principle, we should separate this into two patches, to avoid
compiling error, merge them into one.

Then virtio-crypto gets request from guest side, and forwards the
request to builtin driver to handle it.

Test with a guest linux:
1, The self-test framework of crypto layer works fine in guest kernel
2, Test with Linux guest(with asym support), the following script
test(note that pkey_XXX is supported only in a newer version of keyutils):
  - both public key & private key
  - create/close session
  - encrypt/decrypt/sign/verify basic driver operation
  - also test with kernel crypto layer(pkey add/query)

All the cases work fine.

Run script in guest:
rm -rf *.der *.pem *.pfx
modprobe pkcs8_key_parser # if CONFIG_PKCS8_PRIVATE_KEY_PARSER=m
rm -rf /tmp/data
dd if=/dev/random of=/tmp/data count=1 bs=20

openssl req -nodes -x509 -newkey rsa:2048 -keyout key.pem -out cert.pem -subj "/C=CN/ST=BJ/L=HD/O=qemu/OU=dev/CN=qemu/emailAddress=qemu@qemu.org"
openssl pkcs8 -in key.pem -topk8 -nocrypt -outform DER -out key.der
openssl x509 -in cert.pem -inform PEM -outform DER -out cert.der

PRIV_KEY_ID=`cat key.der | keyctl padd asymmetric test_priv_key @s`
echo "priv key id = "$PRIV_KEY_ID
PUB_KEY_ID=`cat cert.der | keyctl padd asymmetric test_pub_key @s`
echo "pub key id = "$PUB_KEY_ID

keyctl pkey_query $PRIV_KEY_ID 0
keyctl pkey_query $PUB_KEY_ID 0

echo "Enc with priv key..."
keyctl pkey_encrypt $PRIV_KEY_ID 0 /tmp/data enc=pkcs1 >/tmp/enc.priv
echo "Dec with pub key..."
keyctl pkey_decrypt $PRIV_KEY_ID 0 /tmp/enc.priv enc=pkcs1 >/tmp/dec
cmp /tmp/data /tmp/dec

echo "Sign with priv key..."
keyctl pkey_sign $PRIV_KEY_ID 0 /tmp/data enc=pkcs1 hash=sha1 > /tmp/sig
echo "Verify with pub key..."
keyctl pkey_verify $PRIV_KEY_ID 0 /tmp/data /tmp/sig enc=pkcs1 hash=sha1

echo "Enc with pub key..."
keyctl pkey_encrypt $PUB_KEY_ID 0 /tmp/data enc=pkcs1 >/tmp/enc.pub
echo "Dec with priv key..."
keyctl pkey_decrypt $PRIV_KEY_ID 0 /tmp/enc.pub enc=pkcs1 >/tmp/dec
cmp /tmp/data /tmp/dec

echo "Verify with pub key..."
keyctl pkey_verify $PUB_KEY_ID 0 /tmp/data /tmp/sig enc=pkcs1 hash=sha1

Reviewed-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: lei he <helei.sig11@bytedance.com
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Message-Id: <20220611064243.24535-2-pizhenwei@bytedance.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

virtio-iommu: Add an assert check in translate routine

With address space switch supported, dma access translation only
happen after endpoint is attached to a non-bypass domain.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Message-Id: <20220613061010.2674054-4-zhenzhong.duan@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

virtio-iommu: Use recursive lock to avoid deadlock

When switching address space with mutex lock hold, mapping will be
replayed for assigned device. This will trigger relock deadlock.

Also release the mutex resource in unrealize routine.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Message-Id: <20220613061010.2674054-3-zhenzhong.duan@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

virtio-iommu: Add bypass mode support to assigned device

Currently assigned devices can not work in virtio-iommu bypass mode.
Guest driver fails to probe the device due to DMA failure. And the
reason is because of lacking GPA -> HPA mappings when VM is created.

Add a root container memory region to hold both bypass memory region
and iommu memory region, so the switch between them is supported
just like the implementation in virtual VT-d.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Message-Id: <20220613061010.2674054-2-zhenzhong.duan@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

virtio/vhost-user: Fix wrong vhost notifier GPtrArray size

In fetch_or_create_notifier, idx begins with 0. So the GPtrArray size
should be idx + 1 and g_ptr_array_set_size should be called with idx + 1.

This wrong GPtrArray size causes fetch_or_create_notifier return an invalid
address. Passing this invalid pointer to vhost_user_host_notifier_remove
causes assert fail:

    qemu/include/qemu/int128.h:27: int128_get64: Assertion `r == a' failed.
shutting down, reason=crashed

Backends like dpdk-vdpa which sends out vhost notifier requests almost always
hit qemu crash.

Fixes: 503e355465 ("virtio/vhost-user: dynamically assign VhostUserHostNotifiers")
Signed-off-by: Yajun Wu <yajunw@nvidia.com>
Acked-by: Parav Pandit <parav@nvidia.com>
Change-Id: I87e0f7591ca9a59d210879b260704a2d9e9d6bcd
Message-Id: <20220526034851.683258-1-yajunw@nvidia.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Eddie Dong <eddie.dong@intel.com>

docs/cxl: Add switch documentation

Switches were already introduced, but now we support them update
the documentation to provide an example in diagram and
qemu command line parameter forms.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20220616145126.8002-4-Jonathan.Cameron@huawei.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

pci-bridge/cxl_downstream: Add a CXL switch downstream port

Emulation of a simple CXL Switch downstream port.
The Device ID has been allocated for this use.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20220616145126.8002-3-Jonathan.Cameron@huawei.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

pci-bridge/cxl_upstream: Add a CXL switch upstream port

An initial simple upstream port emulation to allow the creation
of CXL switches. The Device ID has been allocated for this use.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20220616145126.8002-2-Jonathan.Cameron@huawei.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

Merge tag 'pull-9p-20220616' of https://github.com/cschoenebeck/qemu into staging

9pfs: fix 'Twalk' protocol violation

Actual fix is patch 5, whereas patch 4 being preparatory, all other
patches are test cases to guard this Twalk issue.

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# -----END PGP SIGNATURE-----
# gpg: Signature made Thu 16 Jun 2022 03:59:44 AM PDT
# gpg:                using RSA key 96D8D110CF7AF8084F88590134C2B58765A47395
# gpg:                issuer "qemu_oss@crudebyte.com"
# gpg: Good signature from "Christian Schoenebeck <qemu_oss@crudebyte.com>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: ECAB 1A45 4014 1413 BA38  4926 30DB 47C3 A012 D5F4
#      Subkey fingerprint: 96D8 D110 CF7A F808 4F88  5901 34C2 B587 65A4 7395

* tag 'pull-9p-20220616' of https://github.com/cschoenebeck/qemu:
  tests/9pfs: check fid being unaffected in fs_walk_2nd_nonexistent
  tests/9pfs: guard recent 'Twalk' behaviour fix
  9pfs: fix 'Twalk' to only send error if no component walked
  9pfs: refactor 'name_idx' -> 'nwalked' in v9fs_walk()
  tests/9pfs: compare QIDs in fs_walk_none() test
  tests/9pfs: Twalk with nwname=0
  tests/9pfs: walk to non-existent dir

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

Merge tag 'for-upstream' of https://gitlab.com/bonzini/qemu into staging

* statistics subsystem
* virtio reset cleanups
* build system cleanups
* fix Cirrus CI

# -----BEGIN PGP SIGNATURE-----
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# -----END PGP SIGNATURE-----
# gpg: Signature made Wed 15 Jun 2022 02:12:36 AM PDT
# gpg:                using RSA key F13338574B662389866C7682BFFBD25F78C7AE83
# gpg:                issuer "pbonzini@redhat.com"
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" [undefined]
# gpg:                 aka "Paolo Bonzini <pbonzini@redhat.com>" [undefined]
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* tag 'for-upstream' of https://gitlab.com/bonzini/qemu: (21 commits)
  build: include pc-bios/ part in the ROMS variable
  meson: put cross compiler info in a separate section
  q35：Enable TSEG only when G_SMRAME and TSEG_EN both enabled
  build: fix check for -fsanitize-coverage-allowlist
  tests/vm: allow running tests in an unconfigured source tree
  configure: cleanup -fno-pie detection
  configure: update list of preserved environment variables
  virtio-mmio: cleanup reset
  virtio: stop ioeventfd on reset
  virtio-mmio: stop ioeventfd on legacy reset
  s390x: simplify virtio_ccw_reset_virtio
  block: add more commands to preconfig mode
  hmp: add filtering of statistics by name
  qmp: add filtering of statistics by name
  hmp: add filtering of statistics by provider
  qmp: add filtering of statistics by provider
  hmp: add basic "info stats" implementation
  cutils: add functions for IEC and SI prefixes
  qmp: add filtering of statistics by target vCPU
  kvm: Support for querying fd-based stats
  ...

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

tests/9pfs: check fid being unaffected in fs_walk_2nd_nonexistent

Extend previously added test case by checking that fid was unaffected
by 'Twalk' request (i.e. when 2nd path component of request being
invalid). Do that by subsequently sending a 'Tgetattr' request with
the fid previously used for 'Twalk'; that 'Tgetattr' request should
return an 'Rlerror' response by 9p server with error code ENOENT as
that fid is basically invalid.

And as we are at it, also check that the QID returned by 'Twalk' is
not identical to the root node's QID.

Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Message-Id: <6f0813cafdbf683cdac8b1492dd4ef8699c5b1d9.1647339025.git.qemu_oss@crudebyte.com>

tests/9pfs: guard recent 'Twalk' behaviour fix

Previous 9p patch fixed 'Twalk' request handling, which was previously not
behaving as specified by the 9p2000 protocol spec. This patch adds a new test
case which guards the new 'Twalk' behaviour in question.

More specifically: it sends a 'Twalk' request where the 1st path component
is valid, whereas the 2nd path component transmitted to server does not
exist. The expected behaviour is that 9p server would respond by sending
a 'Rwalk' response with exactly 1 QID (instead of 'Rlerror' response).

Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Message-Id: <61bde2f44b87e24b70ec098dfb81765665b2dfcb.1647339025.git.qemu_oss@crudebyte.com>

9pfs: fix 'Twalk' to only send error if no component walked

Current implementation of 'Twalk' request handling always sends an 'Rerror'
response if any error occured. The 9p2000 protocol spec says though:

  "
  If the first element cannot be walked for any reason, Rerror is returned.
  Otherwise, the walk will return an Rwalk message containing nwqid qids
  corresponding, in order, to the files that are visited by the nwqid
  successful elementwise walks; nwqid is therefore either nwname or the index
  of the first elementwise walk that failed.
  "

  http://ericvh.github.io/9p-rfc/rfc9p2000.html#anchor33

For that reason we are no longer leaving from an error path in function
v9fs_walk(), unless really no path component could be walked successfully or
if the request has been interrupted.

Local variable 'nwalked' counts and reflects the number of path components
successfully processed by background I/O thread, whereas local variable
'name_idx' subsequently counts and reflects the number of path components
eventually accepted successfully by 9p server controller portion.

New local variable 'any_err' is an aggregate variable reflecting whether any
error occurred at all, while already existing variable 'err' only reflects
the last error.

Despite QIDs being delivered to client in a more relaxed way now, it is
important to note though that fid still must remain unaffected if any error
occurred.

Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Message-Id: <bc73e24258a75dc29458024c7936c8a036c3eac5.1647339025.git.qemu_oss@crudebyte.com>

9pfs: refactor 'name_idx' -> 'nwalked' in v9fs_walk()

The local variable 'name_idx' is used in two loops in function v9fs_walk().
Let the first loop use its own variable 'nwalked' instead, which we will
use in subsequent patch as the number of (requested) path components
successfully walked by background I/O thread.

Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Message-Id: <d506308e7e343023c4db95d0e6053dd2627ed3c1.1647339025.git.qemu_oss@crudebyte.com>

tests/9pfs: compare QIDs in fs_walk_none() test

Extend previously added fs_walk_none() test by comparing the QID
of the root fid with the QID of the cloned fid. They should be
equal.

Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Message-Id: <5bbe9c6931b4600a9a23742f5ff2d38c1188237d.1647339025.git.qemu_oss@crudebyte.com>

tests/9pfs: Twalk with nwname=0

Send Twalk request with nwname=0. In this case no QIDs should
be returned by 9p server; this is equivalent to walking to dot.

Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Message-Id: <b5ead2775000203607801f09bcefc04c493d8bfa.1647339025.git.qemu_oss@crudebyte.com>

tests/9pfs: walk to non-existent dir

Expect ENOENT Rlerror response when trying to walk to a
non-existent directory.

Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Based-on: <E1nTpyU-0000yR-9o@lizzy.crudebyte.com>
Message-Id: <1f5aa50ace3ba3861ea31e8888367518282065a6.1647339025.git.qemu_oss@crudebyte.com>

Merge tag 'block-pull-request' of https://gitlab.com/stefanha/qemu into staging

Pull request

This pull request includes an important aio=native I/O stall fix, the
experimental vifo-user server, the io_uring_register_ring_fd() optimization for
aio=io_uring, and an update to Vladimir Sementsov-Ogievskiy's maintainership
details.

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# -----END PGP SIGNATURE-----
# gpg: Signature made Wed 15 Jun 2022 08:50:56 AM PDT
# gpg:                using RSA key 8695A8BFD3F97CDAAC35775A9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" [full]
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>" [full]

* tag 'block-pull-request' of https://gitlab.com/stefanha/qemu:
  linux-aio: explain why max batch is checked in laio_io_unplug()
  linux-aio: fix unbalanced plugged counter in laio_io_unplug()
  vfio-user: handle reset of remote device
  vfio-user: handle device interrupts
  vfio-user: handle PCI BAR accesses
  vfio-user: handle DMA mappings
  vfio-user: IOMMU support for remote device
  vfio-user: handle PCI config space accesses
  vfio-user: run vfio-user context
  vfio-user: find and init PCI device
  vfio-user: instantiate vfio-user context
  vfio-user: define vfio-user-server object
  vfio-user: build library
  remote/machine: add vfio-user property
  remote/machine: add HotplugHandler for remote machine
  qdev: unplug blocker for devices
  Use io_uring_register_ring_fd() to skip fd operations
  MAINTAINERS: update Vladimir's address and repositories

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

linux-aio: explain why max batch is checked in laio_io_unplug()

It may not be obvious why laio_io_unplug() checks max batch. I discussed
this with Stefano and have added a comment summarizing the reason.

Cc: Stefano Garzarella <sgarzare@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Message-id: 20220609164712.1539045-3-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

linux-aio: fix unbalanced plugged counter in laio_io_unplug()

Every laio_io_plug() call has a matching laio_io_unplug() call. There is
a plugged counter that tracks the number of levels of plugging and
allows for nesting.

The plugged counter must reflect the balance between laio_io_plug() and
laio_io_unplug() calls accurately. Otherwise I/O stalls occur since
io_submit(2) calls are skipped while plugged.

Reported-by: Nikolay Tenev <nt@storpool.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Message-id: 20220609164712.1539045-2-stefanha@redhat.com
Cc: Stefano Garzarella <sgarzare@redhat.com>
Fixes: 68d7946648 ("linux-aio: add `dev_max_batch` parameter to laio_io_unplug()")
[Stefano Garzarella suggested adding a Fixes tag.
--Stefan]
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

vfio-user: handle reset of remote device

Adds handler to reset a remote device

Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 112eeadf3bc4c6cdb100bc3f9a6fcfc20b467c1b.1655151679.git.jag.raman@oracle.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

vfio-user: handle device interrupts

Forward remote device's interrupts to the guest

Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Message-id: 9523479eaafe050677f4de2af5dd0df18c27cfd9.1655151679.git.jag.raman@oracle.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

vfio-user: handle PCI BAR accesses

Determine the BARs used by the PCI device and register handlers to
manage the access to the same.

Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 3373e10b5be5f42846f0632d4382466e1698c505.1655151679.git.jag.raman@oracle.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

vfio-user: handle DMA mappings

Define and register callbacks to manage the RAM regions used for
device DMA

Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: faacbcd45c4d02c591f0dbfdc19041fbb3eae7eb.1655151679.git.jag.raman@oracle.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

vfio-user: IOMMU support for remote device

Assign separate address space for each device in the remote processes.

Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: afe0b0a97582cdad42b5b25636a29c523265a10a.1655151679.git.jag.raman@oracle.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

vfio-user: handle PCI config space accesses

Define and register handlers for PCI config space accesses

Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: be9d2ccf9b1d24e50dcd9c23404dbf284142cec7.1655151679.git.jag.raman@oracle.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

vfio-user: run vfio-user context

Setup a handler to run vfio-user context. The context is driven by
messages to the file descriptor associated with it - get the fd for
the context and hook up the handler with it

Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: e934b0090529d448b6a7972b21dfc3d7421ce494.1655151679.git.jag.raman@oracle.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

vfio-user: find and init PCI device

Find the PCI device with specified id. Initialize the device context
with the QEMU PCI device

Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 7798dbd730099b33fdd00c4c202cfe79e5c5c151.1655151679.git.jag.raman@oracle.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

vfio-user: instantiate vfio-user context

create a context with the vfio-user library to run a PCI device

Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: a452871ac8c812ff96fc4f0ce6037f4769953fab.1655151679.git.jag.raman@oracle.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

vfio-user: define vfio-user-server object

Define vfio-user object which is remote process server for QEMU. Setup
object initialization functions and properties necessary to instantiate
the object

Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: e45a17001e9b38f451543a664ababdf860e5f2f2.1655151679.git.jag.raman@oracle.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

vfio-user: build library

add the libvfio-user library as a submodule. build it as a meson
subproject.

libvfio-user is distributed with BSD 3-Clause license and
json-c with MIT (Expat) license

Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: c2adec87958b081d1dc8775d4aa05c897912f025.1655151679.git.jag.raman@oracle.com

[Changed submodule URL to QEMU's libvfio-user mirror on GitLab. The QEMU
project mirrors its dependencies so that it can provide full source code
even in the event that its dependencies become unavailable. Note that
the mirror repo is manually updated, so please contact me to make newer
libvfio-user commits available. If I become a bottleneck we can set up a
cronjob.

Updated scripts/meson-buildoptions.sh to match the meson_options.txt
change. Failure to do so can result in scripts/meson-buildoptions.sh
being modified by the build system later on and you end up with a dirty
working tree.
--Stefan]

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

remote/machine: add vfio-user property

Add vfio-user to x-remote machine. It is a boolean, which indicates if
the machine supports vfio-user protocol. The machine configures the bus
differently vfio-user and multiprocess protocols, so this property
informs it on how to configure the bus.

This property should be short lived. Once vfio-user fully replaces
multiprocess, this property could be removed.

Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 5d51a152a419cbda35d070b8e49b772b60a7230a.1655151679.git.jag.raman@oracle.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

remote/machine: add HotplugHandler for remote machine

Allow hotplugging of PCI(e) devices to remote machine

Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: d1e6cfa0afb528ad343758f9b1d918be0175c5e5.1655151679.git.jag.raman@oracle.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

qdev: unplug blocker for devices

Add blocker to prevent hot-unplug of devices

TYPE_VFIO_USER_SERVER, which is introduced shortly, attaches itself to a
PCIDevice on which it depends. If the attached PCIDevice gets removed
while the server in use, it could cause it crash. To prevent this,
TYPE_VFIO_USER_SERVER adds an unplug blocker for the PCIDevice.

Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: c41ef80b7cc063314d629737bed2159e5713f2e0.1655151679.git.jag.raman@oracle.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

Use io_uring_register_ring_fd() to skip fd operations

Linux recently added a new io_uring(7) optimization API that QEMU
doesn't take advantage of yet. The liburing library that QEMU uses
has added a corresponding new API calling io_uring_register_ring_fd().
When this API is called after creating the ring, the io_uring_submit()
library function passes a flag to the io_uring_enter(2) syscall
allowing it to skip the ring file descriptor fdget()/fdput()
operations. This saves some CPU cycles.

Signed-off-by: Sam Li <faithilikerun@gmail.com>
Message-id: 20220531105011.111082-1-faithilikerun@gmail.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

MAINTAINERS: update Vladimir's address and repositories

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Message-id: 20220526115432.138384-1-vsementsov@yandex-team.ru
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

build: include pc-bios/ part in the ROMS variable

Include the full path in TARGET_DIR, so that messages from sub-Makefiles
are clearer.  Also, prepare for possibly building firmware outside
pc-bios/ from the Makefile,

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

meson: put cross compiler info in a separate section

While at it, remove a dead assignment and simply inline the value of the
"target" variable, which is used just once.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

q35：Enable TSEG only when G_SMRAME and TSEG_EN both enabled

According to spec:
"TSEG Enable (T_EN): Enabling of SMRAM memory for Extended SMRAM space
only. When G_SMRAME = 1 and TSEG_EN = 1, the TSEG is enabled to appear
in the appropriate physical address space. Note that once D_LCK is set,
this bit becomes read only."

Changed to match the spec description.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Message-Id: <20220615034501.2733802-1-zhenzhong.duan@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>