qemu.git
2 months agorust: qemu_api: add a documentation header for all modules
Paolo Bonzini [Thu, 30 Jan 2025 10:11:18 +0000 (11:11 +0100)]
rust: qemu_api: add a documentation header for all modules

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2 months agoi386: enable rust hpet for pc when rust is enabled
Zhao Liu [Mon, 10 Feb 2025 03:00:51 +0000 (11:00 +0800)]
i386: enable rust hpet for pc when rust is enabled

Add HPET configuration in PC's Kconfig options, and select HPET device
(Rust version) if Rust is supported.

Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250210030051.2562726-11-zhao1.liu@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2 months agorust/timer/hpet: add qom and qdev APIs support
Zhao Liu [Mon, 10 Feb 2025 03:00:50 +0000 (11:00 +0800)]
rust/timer/hpet: add qom and qdev APIs support

Implement QOM & QAPI support for HPET device.

Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250210030051.2562726-10-zhao1.liu@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2 months agorust/timer/hpet: add basic HPET timer and HPETState
Zhao Liu [Mon, 10 Feb 2025 03:00:49 +0000 (11:00 +0800)]
rust/timer/hpet: add basic HPET timer and HPETState

Add the HPETTimer and HPETState (HPET timer block), along with their
basic methods and register definitions.

This is in preparation for supporting the QAPI interfaces.

Note, wrap all items in HPETState that may be changed in the callback
called by C code into the BqlCell/BqlRefCell.

Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250210030051.2562726-9-zhao1.liu@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2 months agorust/timer/hpet: define hpet_fw_cfg
Zhao Liu [Mon, 10 Feb 2025 03:00:48 +0000 (11:00 +0800)]
rust/timer/hpet: define hpet_fw_cfg

Define HPETFwEntry structure with the same memory layout as
hpet_fw_entry in C.

Further, define the global hpet_cfg variable in Rust which is the
same as the C version. This hpet_cfg variable in Rust will replace
the C version one and allows both Rust code and C code to access it.

The Rust version of hpet_cfg is self-contained, avoiding unsafe
access to C code.

Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250210030051.2562726-8-zhao1.liu@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2 months agorust: add bindings for timer
Zhao Liu [Mon, 10 Feb 2025 03:00:47 +0000 (11:00 +0800)]
rust: add bindings for timer

Add timer bindings to help handle idiomatic Rust callbacks.

Additionally, wrap QEMUClockType in ClockType binding to avoid unsafe
calls in device code.

Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250210030051.2562726-7-zhao1.liu@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2 months agorust: add bindings for memattrs
Zhao Liu [Sat, 25 Jan 2025 12:51:32 +0000 (20:51 +0800)]
rust: add bindings for memattrs

The MemTxAttrs structure contains bitfield members, and bindgen is
unable to generate an equivalent macro definition for
MEMTXATTRS_UNSPECIFIED.

Therefore, manually define a global constant variable
MEMTXATTRS_UNSPECIFIED to support calls from Rust code.

Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250125125137.1223277-6-zhao1.liu@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2 months agorust: add bindings for gpio_{in|out} initialization
Zhao Liu [Mon, 10 Feb 2025 03:00:45 +0000 (11:00 +0800)]
rust: add bindings for gpio_{in|out} initialization

Wrap qdev_init_gpio_{in|out} as methods in DeviceMethods. And for
qdev_init_gpio_in, based on FnCall, it can support idiomatic Rust
callback without the need for C style wrapper.

Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250210030051.2562726-5-zhao1.liu@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2 months agorust/irq: Add a helper to convert [InterruptSource] to pointer
Zhao Liu [Mon, 10 Feb 2025 03:00:44 +0000 (11:00 +0800)]
rust/irq: Add a helper to convert [InterruptSource] to pointer

This is useful when taking an InterruptSource slice and passing it to C
function.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250210030051.2562726-4-zhao1.liu@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2 months agorust/qdev: add the macro to define bit property
Zhao Liu [Mon, 10 Feb 2025 03:00:43 +0000 (11:00 +0800)]
rust/qdev: add the macro to define bit property

HPET device (Rust device) needs to define the bit type property.

Add a variant of define_property macro to define bit type property.

Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250210030051.2562726-3-zhao1.liu@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2 months agoi386/fw_cfg: move hpet_cfg definition to hpet.c
Zhao Liu [Mon, 10 Feb 2025 03:00:42 +0000 (11:00 +0800)]
i386/fw_cfg: move hpet_cfg definition to hpet.c

HPET device needs to access and update hpet_cfg variable, but now it is
defined in hw/i386/fw_cfg.c and Rust code can't access it.

Move hpet_cfg definition to hpet.c (and rename it to hpet_fw_cfg). This
allows Rust HPET device implements its own global hpet_fw_cfg variable,
and will further reduce the use of unsafe C code access and calls in the
Rust HPET implementation.

Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250210030051.2562726-2-zhao1.liu@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2 months agorust: pl011: convert pl011_create to safe Rust
Paolo Bonzini [Mon, 10 Feb 2025 15:11:58 +0000 (16:11 +0100)]
rust: pl011: convert pl011_create to safe Rust

Not a major change but, as a small but significant step in creating
qdev bindings, show how pl011_create can be written without "unsafe"
calls (apart from converting pointers to references).

This also provides a starting point for creating Error** bindings.

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2 months agorust: chardev, qdev: add bindings to qdev_prop_set_chr
Paolo Bonzini [Mon, 3 Feb 2025 10:04:07 +0000 (11:04 +0100)]
rust: chardev, qdev: add bindings to qdev_prop_set_chr

Because the argument to the function is an Owned<Chardev>, this also
adds an ObjectType implementation to Chardev.

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2 months agorust: irq: define ObjectType for IRQState
Paolo Bonzini [Mon, 3 Feb 2025 10:04:07 +0000 (11:04 +0100)]
rust: irq: define ObjectType for IRQState

This is a small preparation in order to use an Owned<IRQState> for the argument
to sysbus_connect_irq.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2 months agorust: bindings for MemoryRegionOps
Paolo Bonzini [Fri, 17 Jan 2025 17:14:25 +0000 (18:14 +0100)]
rust: bindings for MemoryRegionOps

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2 months agorust: bindings: add Send and Sync markers for types that have bindings
Paolo Bonzini [Fri, 13 Dec 2024 16:09:35 +0000 (17:09 +0100)]
rust: bindings: add Send and Sync markers for types that have bindings

This is needed for the MemoryRegionOps<T> to be declared as static;
Rust requires static elements to be Sync.

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2 months agorust: qdev: switch from legacy reset to Resettable
Paolo Bonzini [Fri, 17 Jan 2025 10:26:48 +0000 (11:26 +0100)]
rust: qdev: switch from legacy reset to Resettable

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2 months agorust: qdev: make ObjectImpl a supertrait of DeviceImpl
Paolo Bonzini [Tue, 7 Jan 2025 11:01:18 +0000 (12:01 +0100)]
rust: qdev: make ObjectImpl a supertrait of DeviceImpl

In practice it has to be implemented always in order to access an
implementation of ClassInitImpl<ObjectClass>.  Make the relationship
explicit in the code.

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2 months agorust: qom: allow initializing interface vtables
Paolo Bonzini [Fri, 17 Jan 2025 10:23:14 +0000 (11:23 +0100)]
rust: qom: allow initializing interface vtables

Unlike regular classes, interface vtables can only be obtained via
object_class_dynamic_cast.  Provide a wrapper that allows accessing
the vtable and pass it to a ClassInitImpl implementation, for example
ClassInitImpl<ResettableClass>.

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2 months agorust: qdev: add clock creation
Paolo Bonzini [Fri, 17 Jan 2025 10:21:26 +0000 (11:21 +0100)]
rust: qdev: add clock creation

Add a Rust version of qdev_init_clock_in, which can be used in
instance_init.  There are a couple differences with the C
version:

- in Rust the object keeps its own reference to the clock (in addition to
  the one embedded in the NamedClockList), and the reference is dropped
  automatically by instance_finalize(); this is encoded in the signature
  of DeviceClassMethods::init_clock_in, which makes the lifetime of the
  clock independent of that of the object it holds.  This goes unnoticed
  in the C version and is due to the existence of aliases.

- also, anything that happens during instance_init uses the pinned_init
  framework to operate on a partially initialized object, and is done
  through class methods (i.e. through DeviceClassMethods rather than
  DeviceMethods) because the device does not exist yet.  Therefore, Rust
  code *must* create clocks from instance_init, which is stricter than C.

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2 months agorust: callbacks: allow passing optional callbacks as ()
Paolo Bonzini [Fri, 6 Dec 2024 16:08:49 +0000 (17:08 +0100)]
rust: callbacks: allow passing optional callbacks as ()

In some cases, callbacks are optional.  Using "Some(function)" and "None"
does not work well, because when someone writes "None" the compiler does
not know what to use for "F" in "Option<F>".

Therefore, adopt () to mean a "null" callback.  It is possible to enforce
that a callback is valid by adding a "let _: () = F::ASSERT_IS_SOME" before
the invocation of F::call.

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2 months agorust: qom: add object creation functionality
Paolo Bonzini [Thu, 31 Oct 2024 13:27:36 +0000 (14:27 +0100)]
rust: qom: add object creation functionality

The basic object lifecycle test can now be implemented using safe code!

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2 months agorust: qom: add reference counting functionality
Paolo Bonzini [Fri, 17 Jan 2025 11:00:01 +0000 (12:00 +0100)]
rust: qom: add reference counting functionality

Add a smart pointer that allows to add and remove references from
QOM objects.  It's important to note that while all QOM objects have a
reference count, in practice not all of them have their lifetime guarded
by it.  Embedded objects, specifically, are confined to the lifetime of
the owner.

When writing Rust bindings this is important, because embedded objects are
*never* used through the "Owned<>" smart pointer that is introduced here.

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2 months agorust: docs: document naming convention
Paolo Bonzini [Thu, 13 Feb 2025 11:12:43 +0000 (12:12 +0100)]
rust: docs: document naming convention

As agreed in the "vtables and procedural macros" thread on
the mailing list.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2 months agoMerge tag 'pull-loongarch-20250212' of https://gitlab.com/bibo-mao/qemu into staging
Stefan Hajnoczi [Wed, 12 Feb 2025 14:16:36 +0000 (09:16 -0500)]
Merge tag 'pull-loongarch-20250212' of https://gitlab.com/bibo-mao/qemu into staging

loongarch queue

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# gpg: Good signature from "bibo mao <maobibo@loongson.cn>" [unknown]
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#      Subkey fingerprint: 0D86 42A3 A265 9F80 B0B3  D1A4 1F7B 0C12 51AC E7D1

* tag 'pull-loongarch-20250212' of https://gitlab.com/bibo-mao/qemu:
  hw/loongarch/virt: CPU irq line connection improvement
  hw/loongarch/virt: Remove unused ipistate
  hw/loongarch/virt: Set iocsr address space when CPU is created
  hw/loongarch/virt: Add separate file for fdt building
  hw/loongarch/virt: Rename function prefix name
  hw/loongarch/virt: Rename filename acpi-build with virt-acpi-build

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2 months agoMerge tag 'pull-nbd-2025-02-11' of https://repo.or.cz/qemu/ericb into staging
Stefan Hajnoczi [Wed, 12 Feb 2025 13:48:44 +0000 (08:48 -0500)]
Merge tag 'pull-nbd-2025-02-11' of https://repo.or.cz/qemu/ericb into staging

NBD patches for 2025-02-11

- Add --handshake-limit option to qemu-nbd

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* tag 'pull-nbd-2025-02-11' of https://repo.or.cz/qemu/ericb:
  nbd/server: Allow users to adjust handshake limit in QMP
  qemu-nbd: Allow users to adjust handshake limit

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2 months agoMerge tag 'pull-target-arm-20250211' of https://git.linaro.org/people/pmaydell/qemu...
Stefan Hajnoczi [Wed, 12 Feb 2025 13:48:33 +0000 (08:48 -0500)]
Merge tag 'pull-target-arm-20250211' of https://git.linaro.org/people/pmaydell/qemu-arm into staging

target-arm queue:
 * target/alpha: Don't corrupt error_code with unknown softfloat flags
 * target/arm: Implement FEAT_AFP and FEAT_RPRES

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# gpg: Good signature from "Peter Maydell <peter.maydell@linaro.org>" [full]
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# gpg:                 aka "Peter Maydell <pmaydell@chiark.greenend.org.uk>" [full]
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# Primary key fingerprint: E1A5 C593 CD41 9DE2 8E83  15CF 3C25 25ED 1436 0CDE

* tag 'pull-target-arm-20250211' of https://git.linaro.org/people/pmaydell/qemu-arm: (68 commits)
  target/arm: Sink fp_status and fpcr access into do_fmlal*
  target/arm: Read fz16 from env->vfp.fpcr
  target/arm: Simplify DO_VFP_cmp in vfp_helper.c
  target/arm: Simplify fp_status indexing in mve_helper.c
  target/arm: Remove fp_status_a32
  target/arm: Remove fp_status_a64
  target/arm: Remove fp_status_f16_a32
  target/arm: Remove fp_status_f16_a64
  target/arm: Remove ah_fp_status
  target/arm: Remove ah_fp_status_f16
  target/arm: Remove standard_fp_status
  target/arm: Remove standard_fp_status_f16
  target/arm: Introduce CPUARMState.vfp.fp_status[]
  target/arm: Enable FEAT_RPRES for -cpu max
  target/arm: Implement increased precision FRSQRTE
  target/arm: Implement increased precision FRECPE
  target/arm: Plumb FEAT_RPRES frecpe and frsqrte through to new helper
  target/arm: Enable FEAT_AFP for '-cpu max'
  target/arm: Handle FPCR.AH in SVE FMLSLB, FMLSLT (vectors)
  target/arm: Handle FPCR.AH in SVE FMLSL (indexed)
  ...

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2 months agoMerge tag 'pull-vfio-20250211' of https://github.com/legoater/qemu into staging
Stefan Hajnoczi [Wed, 12 Feb 2025 13:48:07 +0000 (08:48 -0500)]
Merge tag 'pull-vfio-20250211' of https://github.com/legoater/qemu into staging

vfio queue:

* Coverity fix
* IGD cleanups using VFIOQuirk
* SIGSEV fix in IOMMUFD host IOMMU device
* Improved error reporting for MMIO region mapping failures

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# gpg: Signature made Tue 11 Feb 2025 08:23:00 EST
# gpg:                using RSA key A0F66548F04895EBFE6B0B6051A343C7CFFBECA1
# gpg: Good signature from "Cédric Le Goater <clg@redhat.com>" [full]
# gpg:                 aka "Cédric Le Goater <clg@kaod.org>" [full]
# Primary key fingerprint: A0F6 6548 F048 95EB FE6B  0B60 51A3 43C7 CFFB ECA1

* tag 'pull-vfio-20250211' of https://github.com/legoater/qemu:
  vfio: Remove superfluous error report in vfio_listener_region_add()
  vfio: Remove reports of DMA mapping errors in backends
  vfio: Improve error reporting when MMIO region mapping fails
  vfio: Introduce vfio_get_vfio_device()
  vfio: Rephrase comment in vfio_listener_region_add() error path
  vfio/pci: Replace "iommu_device" by "vIOMMU"
  util/error: Introduce warn_report_err_once()
  vfio/iommufd: Fix SIGSEV in iommufd_cdev_attach()
  vfio/igd: use VFIOConfigMirrorQuirk for mirrored registers
  vfio/pci: introduce config_offset field in VFIOConfigMirrorQuirk
  vfio/pci: declare generic quirks in a new header file
  vfio/igd: Fix potential overflow in igd_gtt_memory_size()

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2 months agohw/loongarch/virt: CPU irq line connection improvement
Bibo Mao [Wed, 5 Feb 2025 03:36:14 +0000 (11:36 +0800)]
hw/loongarch/virt: CPU irq line connection improvement

Interrupt controller extioi and ipi connect to CPU with irq line method.
With command -smp x, -device la464-loongarch-cpu, smp.cpus is not
accurate for all possible CPU objects, possible_cpu_arch_ids() is used.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Reviewed-by: Bibo Mao <maobibo@loongson.cn>
2 months agohw/loongarch/virt: Remove unused ipistate
Bibo Mao [Wed, 5 Feb 2025 03:36:13 +0000 (11:36 +0800)]
hw/loongarch/virt: Remove unused ipistate

Field ipistate in LoongArch CPU object is not used any more,
remove it here.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Reviewed-by: Bibo Mao <maobibo@loongson.cn>
2 months agohw/loongarch/virt: Set iocsr address space when CPU is created
Bibo Mao [Wed, 5 Feb 2025 03:36:12 +0000 (11:36 +0800)]
hw/loongarch/virt: Set iocsr address space when CPU is created

There is only one iocsr address space for the whole virt-machine
board. When CPU is created, the one of percpu points to that of
the board.

Here set iocsr address space when CPU is created rather than IPI
creation stage.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Reviewed-by: Bibo Mao <maobibo@loongson.cn>
2 months agohw/loongarch/virt: Add separate file for fdt building
Bibo Mao [Sat, 8 Feb 2025 07:06:55 +0000 (15:06 +0800)]
hw/loongarch/virt: Add separate file for fdt building

Similiar with virt-acpi-build.c, file virt-fdt-build.c is added here.
And move functions relative with fdt table building to the file.

It is only code movement and there is no function change.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
2 months agohw/loongarch/virt: Rename function prefix name
Bibo Mao [Sat, 8 Feb 2025 07:06:54 +0000 (15:06 +0800)]
hw/loongarch/virt: Rename function prefix name

Replace function prefix name loongarch_xxx with virt_xxx in file
virt-acpi-build.c

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
2 months agohw/loongarch/virt: Rename filename acpi-build with virt-acpi-build
Bibo Mao [Sat, 8 Feb 2025 07:06:53 +0000 (15:06 +0800)]
hw/loongarch/virt: Rename filename acpi-build with virt-acpi-build

File acpi-build.c is relative with virt machine type, rename it with
virt-acpi-build.c

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
2 months agonbd/server: Allow users to adjust handshake limit in QMP
Eric Blake [Mon, 3 Feb 2025 22:26:07 +0000 (16:26 -0600)]
nbd/server: Allow users to adjust handshake limit in QMP

Although defaulting the handshake limit to 10 seconds was a nice QoI
change to weed out intentionally slow clients, it can interfere with
integration testing done with manual NBD_OPT commands over 'nbdsh
--opt-mode'.  Expose a QMP knob 'handshake-max-secs' to allow the user
to alter the timeout away from the default.

The parameter name here intentionally matches the spelling of the
constant added in commit fb1c2aaa98, and not the command-line spelling
added in the previous patch for qemu-nbd; that's because in QMP,
longer names serve as good self-documentation, and unlike the command
line, machines don't have problems generating longer spellings.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-ID: <20250203222722.650694-6-eblake@redhat.com>
[eblake: s/max-secs/max-seconds/ in QMP]
Acked-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2 months agoqemu-nbd: Allow users to adjust handshake limit
Eric Blake [Mon, 3 Feb 2025 22:26:06 +0000 (16:26 -0600)]
qemu-nbd: Allow users to adjust handshake limit

Although defaulting the handshake limit to 10 seconds was a nice QoI
change to weed out intentionally slow clients, it can interfere with
integration testing done with manual NBD_OPT commands over 'nbdsh
--opt-mode'.  Expose a command line option to allow the user to alter
the timeout away from the default.  This option is unlikely to be used
in enough scenarios to warrant a short option letter.

The option --handshake-limit intentionally differs from the name of
the constant added in commit fb1c2aaa98 (limit instead of max_secs)
and the QMP name to be added in the next commit; this is because
typing a longer command-line name is undesirable and there is
sufficient --help text to document the units.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-ID: <20250203222722.650694-5-eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
2 months agoMerge tag 'pull-request-2025-02-11' of https://gitlab.com/thuth/qemu into staging
Stefan Hajnoczi [Tue, 11 Feb 2025 18:27:31 +0000 (13:27 -0500)]
Merge tag 'pull-request-2025-02-11' of https://gitlab.com/thuth/qemu into staging

* Convert more avocado tests to the functional framework
* Add a test for the sam460ex machine
* Fix the broken FreeBSD CI job by updating it to the latest version

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# gpg: Signature made Tue 11 Feb 2025 07:28:26 EST
# gpg:                using RSA key 27B88847EEE0250118F3EAB92ED9D774FE702DB5
# gpg:                issuer "thuth@redhat.com"
# gpg: Good signature from "Thomas Huth <th.huth@gmx.de>" [full]
# gpg:                 aka "Thomas Huth <thuth@redhat.com>" [full]
# gpg:                 aka "Thomas Huth <huth@tuxfamily.org>" [full]
# gpg:                 aka "Thomas Huth <th.huth@posteo.de>" [unknown]
# Primary key fingerprint: 27B8 8847 EEE0 2501 18F3  EAB9 2ED9 D774 FE70 2DB5

* tag 'pull-request-2025-02-11' of https://gitlab.com/thuth/qemu:
  gitlab-ci.d/cirrus: Update the FreeBSD job to v14.2
  gitlab: use new(ish) cirrus-vars command for creating config
  gitlab: don't fail cirrus CI jobs when credits are exhausted
  tests/functional: Add a ppc sam460ex test
  tests/functional: Convert the hotplug_blk avocado test
  tests/functional/test_aarch64_virt: Fix vulkan test without egl-headless
  tests/functional: Convert the aarch64 xen test to the functional framework

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2 months agotarget/arm: Sink fp_status and fpcr access into do_fmlal*
Richard Henderson [Sat, 1 Feb 2025 16:40:12 +0000 (16:40 +0000)]
target/arm: Sink fp_status and fpcr access into do_fmlal*

Sink common code from the callers into do_fmlal
and do_fmlal_idx.  Reorder the arguments to minimize
the re-sorting from the caller's arguments.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20250129013857.135256-35-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2 months agotarget/arm: Read fz16 from env->vfp.fpcr
Richard Henderson [Sat, 1 Feb 2025 16:40:11 +0000 (16:40 +0000)]
target/arm: Read fz16 from env->vfp.fpcr

Read the bit from the source, rather than from the proxy via
get_flush_inputs_to_zero.  This makes it clear that it does
not matter which of the float_status structures is used.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20250129013857.135256-34-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2 months agotarget/arm: Simplify DO_VFP_cmp in vfp_helper.c
Richard Henderson [Sat, 1 Feb 2025 16:40:10 +0000 (16:40 +0000)]
target/arm: Simplify DO_VFP_cmp in vfp_helper.c

Pass ARMFPStatusFlavour index instead of fp_status[FOO].

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20250129013857.135256-17-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2 months agotarget/arm: Simplify fp_status indexing in mve_helper.c
Richard Henderson [Sat, 1 Feb 2025 16:40:09 +0000 (16:40 +0000)]
target/arm: Simplify fp_status indexing in mve_helper.c

Select on index instead of pointer.
No functional change.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20250129013857.135256-16-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2 months agotarget/arm: Remove fp_status_a32
Richard Henderson [Sat, 1 Feb 2025 16:40:08 +0000 (16:40 +0000)]
target/arm: Remove fp_status_a32

Replace with fp_status[FPST_A32].  As this was the last of the
old structures, we can remove the anonymous union and struct.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20250129013857.135256-15-richard.henderson@linaro.org
[PMM: tweak to account for change to is_ebf()]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2 months agotarget/arm: Remove fp_status_a64
Richard Henderson [Sat, 1 Feb 2025 16:40:07 +0000 (16:40 +0000)]
target/arm: Remove fp_status_a64

Replace with fp_status[FPST_A64].

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20250129013857.135256-14-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2 months agotarget/arm: Remove fp_status_f16_a32
Richard Henderson [Sat, 1 Feb 2025 16:40:06 +0000 (16:40 +0000)]
target/arm: Remove fp_status_f16_a32

Replace with fp_status[FPST_A32_F16].

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20250129013857.135256-13-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2 months agotarget/arm: Remove fp_status_f16_a64
Richard Henderson [Sat, 1 Feb 2025 16:40:05 +0000 (16:40 +0000)]
target/arm: Remove fp_status_f16_a64

Replace with fp_status[FPST_A64_F16].

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20250129013857.135256-12-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2 months agotarget/arm: Remove ah_fp_status
Richard Henderson [Sat, 1 Feb 2025 16:40:04 +0000 (16:40 +0000)]
target/arm: Remove ah_fp_status

Replace with fp_status[FPST_AH].

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20250129013857.135256-11-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2 months agotarget/arm: Remove ah_fp_status_f16
Richard Henderson [Sat, 1 Feb 2025 16:40:03 +0000 (16:40 +0000)]
target/arm: Remove ah_fp_status_f16

Replace with fp_status[FPST_AH_F16].

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20250129013857.135256-10-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2 months agotarget/arm: Remove standard_fp_status
Richard Henderson [Sat, 1 Feb 2025 16:40:02 +0000 (16:40 +0000)]
target/arm: Remove standard_fp_status

Replace with fp_status[FPST_STD].

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20250129013857.135256-9-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2 months agotarget/arm: Remove standard_fp_status_f16
Richard Henderson [Sat, 1 Feb 2025 16:40:01 +0000 (16:40 +0000)]
target/arm: Remove standard_fp_status_f16

Replace with fp_status[FPST_STD_F16].

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20250129013857.135256-8-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2 months agotarget/arm: Introduce CPUARMState.vfp.fp_status[]
Richard Henderson [Sat, 1 Feb 2025 16:40:00 +0000 (16:40 +0000)]
target/arm: Introduce CPUARMState.vfp.fp_status[]

Move ARMFPStatusFlavour to cpu.h with which to index
this array.  For now, place the array in an anonymous
union with the existing structures.  Adjust the order
of the existing structures to match the enum.

Simplify fpstatus_ptr() using the new array.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20250129013857.135256-7-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2 months agotarget/arm: Enable FEAT_RPRES for -cpu max
Peter Maydell [Sat, 1 Feb 2025 16:39:59 +0000 (16:39 +0000)]
target/arm: Enable FEAT_RPRES for -cpu max

Now the emulation is complete, we can enable FEAT_RPRES for the 'max'
CPU type.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Implement increased precision FRSQRTE
Peter Maydell [Sat, 1 Feb 2025 16:39:58 +0000 (16:39 +0000)]
target/arm: Implement increased precision FRSQRTE

Implement the increased precision variation of FRSQRTE.  In the
pseudocode this corresponds to the handling of the
"increasedprecision" boolean in the FPRSqrtEstimate() and
RecipSqrtEstimate() functions.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Implement increased precision FRECPE
Peter Maydell [Sat, 1 Feb 2025 16:39:57 +0000 (16:39 +0000)]
target/arm: Implement increased precision FRECPE

Implement the increased precision variation of FRECPE.  In the
pseudocode this corresponds to the handling of the
"increasedprecision" boolean in the FPRecipEstimate() and
RecipEstimate() functions.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Plumb FEAT_RPRES frecpe and frsqrte through to new helper
Peter Maydell [Sat, 1 Feb 2025 16:39:56 +0000 (16:39 +0000)]
target/arm: Plumb FEAT_RPRES frecpe and frsqrte through to new helper

FEAT_RPRES implements an "increased precision" variant of the single
precision FRECPE and FRSQRTE instructions from an 8 bit to a 12
bit mantissa. This applies only when FPCR.AH == 1. Note that the
halfprec and double versions of these insns retain the 8 bit
precision regardless.

In this commit we add all the plumbing to make these instructions
call a new helper function when the increased-precision is in
effect. In the following commit we will provide the actual change
in behaviour in the helpers.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Enable FEAT_AFP for '-cpu max'
Peter Maydell [Sat, 1 Feb 2025 16:39:55 +0000 (16:39 +0000)]
target/arm: Enable FEAT_AFP for '-cpu max'

Now that we have completed the handling for FPCR.{AH,FIZ,NEP}, we
can enable FEAT_AFP for '-cpu max', and document that we support it.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Handle FPCR.AH in SVE FMLSLB, FMLSLT (vectors)
Richard Henderson [Sat, 1 Feb 2025 16:39:54 +0000 (16:39 +0000)]
target/arm: Handle FPCR.AH in SVE FMLSLB, FMLSLT (vectors)

Handle FPCR.AH's requirement to not negate the sign of a NaN in SVE
FMLSL (indexed), using the usual trick of negating by XOR when AH=0
and by muladd flags when AH=1.

Since we have the CPUARMState* in the helper anyway, we can
look directly at env->vfp.fpcr and don't need toa pass in the
FPCR.AH value via the SIMD data word.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20250129013857.135256-33-richard.henderson@linaro.org
[PMM: tweaked commit message]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2 months agotarget/arm: Handle FPCR.AH in SVE FMLSL (indexed)
Richard Henderson [Sat, 1 Feb 2025 16:39:53 +0000 (16:39 +0000)]
target/arm: Handle FPCR.AH in SVE FMLSL (indexed)

Handle FPCR.AH's requirement to not negate the sign of a NaN in SVE
FMLSL (indexed), using the usual trick of negating by XOR when AH=0
and by muladd flags when AH=1.

Since we have the CPUARMState* in the helper anyway, we can
look directly at env->vfp.fpcr and don't need toa pass in the
FPCR.AH value via the SIMD data word.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20250129013857.135256-32-richard.henderson@linaro.org
[PMM: commit message tweaked]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2 months agotarget/arm: Handle FPCR.AH in FMLSL (by element and vector)
Richard Henderson [Sat, 1 Feb 2025 16:39:52 +0000 (16:39 +0000)]
target/arm: Handle FPCR.AH in FMLSL (by element and vector)

Handle FPCR.AH's requirement to not negate the sign of a NaN
in FMLSL by element and vector, using the usual trick of
negating by XOR when AH=0 and by muladd flags when AH=1.

Since we have the CPUARMState* in the helper anyway, we can
look directly at env->vfp.fpcr and don't need toa pass in the
FPCR.AH value via the SIMD data word.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20250129013857.135256-31-richard.henderson@linaro.org
[PMM: commit message tweaked]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2 months agotarget/arm: Handle FPCR.AH in SVE FCMLA
Richard Henderson [Sat, 1 Feb 2025 16:39:51 +0000 (16:39 +0000)]
target/arm: Handle FPCR.AH in SVE FCMLA

The negation step in SVE FCMLA mustn't negate a NaN when FPCR.AH is
set.  Use the same approach as we did for A64 FCMLA of passing in
FPCR.AH and using it to select whether to negate by XOR or by the
muladd negate_product flag.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20250129013857.135256-28-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2 months agotarget/arm: Handle FPCR.AH in FCMLA by index
Richard Henderson [Sat, 1 Feb 2025 16:39:50 +0000 (16:39 +0000)]
target/arm: Handle FPCR.AH in FCMLA by index

The negation step in FCMLA by index mustn't negate a NaN when
FPCR.AH is set. Use the same approach as vector FCMLA of
passing in FPCR.AH and using it to select whether to negate
by XOR or by the muladd negate_product flag.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20250129013857.135256-27-richard.henderson@linaro.org
[PMM: Expanded commit message]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2 months agotarget/arm: Handle FPCR.AH in vector FCMLA
Richard Henderson [Sat, 1 Feb 2025 16:39:49 +0000 (16:39 +0000)]
target/arm: Handle FPCR.AH in vector FCMLA

The negation step in FCMLA mustn't negate a NaN when FPCR.AH
is set. Handle this by passing FPCR.AH to the helper via the
SIMD data field, and use this to select whether to do the
negation via XOR or via the muladd negate_product flag.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20250129013857.135256-26-richard.henderson@linaro.org
[PMM: Expanded commit message]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2 months agotarget/arm: Handle FPCR.AH in SVE FTMAD
Peter Maydell [Sat, 1 Feb 2025 16:39:48 +0000 (16:39 +0000)]
target/arm: Handle FPCR.AH in SVE FTMAD

The negation step in the SVE FTMAD insn mustn't negate a NaN when
FPCR.AH is set.  Pass FPCR.AH to the helper via the SIMD data field,
so we can select the correct behaviour.

Because the operand is known to be negative, negating the operand
is the same as taking the absolute value.  Defer this to the muladd
operation via flags, so that it happens after NaN detection, which
is correct for FPCR.AH.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Handle FPCR.AH in SVE FTSSEL
Peter Maydell [Sat, 1 Feb 2025 16:39:47 +0000 (16:39 +0000)]
target/arm: Handle FPCR.AH in SVE FTSSEL

The negation step in the SVE FTSSEL insn mustn't negate a NaN when
FPCR.AH is set.  Pass FPCR.AH to the helper via the SIMD data field
and use that to determine whether to do the negation.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Handle FPCR.AH in negation step in SVE FMLS (vector)
Peter Maydell [Sat, 1 Feb 2025 16:39:46 +0000 (16:39 +0000)]
target/arm: Handle FPCR.AH in negation step in SVE FMLS (vector)

Handle the FPCR.AH "don't negate the sign of a NaN" semantics fro the
SVE FMLS (vector) insns, by providing new helpers for the AH=1 case
which end up passing fpcr_ah = true to the do_fmla_zpzzz_* functions
that do the work.

The float*_muladd functions have a flags argument that can
perform optional negation of various operand.  We don't use
that for "normal" arm fmla, because the muladd flags are not
applied when an input is a NaN.  But since FEAT_AFP does not
negate NaNs, this behaviour is exactly what we need.

The non-AH helpers pass in a zero flags argument and control the
negation via the neg1 and neg3 arguments; the AH helpers always pass
in neg1 and neg3 as zero and control the negation via the flags
argument.  This allows us to avoid conditional branches within the
inner loop.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Handle FPCR.AH in negation in FMLS (vector)
Peter Maydell [Sat, 1 Feb 2025 16:39:45 +0000 (16:39 +0000)]
target/arm: Handle FPCR.AH in negation in FMLS (vector)

Handle the FPCR.AH "don't negate the sign of a NaN" semantics
in FMLS (vector), by implementing a new set of helpers for
the AH=1 case.

The float_muladd_negate_product flag produces the same result
as negating either of the multiplication operands, assuming
neither of the operands are NaNs.  But since FEAT_AFP does not
negate NaNs, this behaviour is exactly what we need.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Handle FPCR.AH in negation step in FMLS (indexed)
Peter Maydell [Sat, 1 Feb 2025 16:39:44 +0000 (16:39 +0000)]
target/arm: Handle FPCR.AH in negation step in FMLS (indexed)

Handle the FPCR.AH "don't negate the sign of a NaN" semantics in FMLS
(indexed). We do this by creating 6 new helpers, which allow us to
do the negation either by XOR (for AH=0) or by muladd flags
(for AH=1).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
[PMM: Mostly from RTH's patch; error in index order into fns[][]
 fixed]
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Handle FPCR.AH in FRECPS and FRSQRTS vector insns
Peter Maydell [Sat, 1 Feb 2025 16:39:43 +0000 (16:39 +0000)]
target/arm: Handle FPCR.AH in FRECPS and FRSQRTS vector insns

Handle the FPCR.AH "don't negate the sign of a NaN" semantics
in the vector versions of FRECPS and FRSQRTS, by implementing
new vector wrappers that call the _ah_ scalar helpers.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Handle FPCR.AH in FRECPS and FRSQRTS scalar insns
Peter Maydell [Sat, 1 Feb 2025 16:39:42 +0000 (16:39 +0000)]
target/arm: Handle FPCR.AH in FRECPS and FRSQRTS scalar insns

Handle the FPCR.AH semantics that we do not change the sign of an
input NaN in the FRECPS and FRSQRTS scalar insns, by providing
new helper functions that do the CHS part of the operation
differently.

Since the extra helper functions would be very repetitive if written
out longhand, we condense them and the existing non-AH helpers into
being emitted via macros.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Handle FPCR.AH in negation steps in FCADD
Peter Maydell [Sat, 1 Feb 2025 16:39:41 +0000 (16:39 +0000)]
target/arm: Handle FPCR.AH in negation steps in FCADD

The negation steps in FCADD must honour FPCR.AH's "don't change the
sign of a NaN" semantics.  Implement this by encoding FPCR.AH into
the SIMD data field passed to the helper and using that to decide
whether to negate the values.

The construction of neg_imag and neg_real were done to make it easy
to apply both in parallel with two simple logical operations.  This
changed with FPCR.AH, which is more complex than that. Switch to
an approach closer to the pseudocode, where we extract the rot
parameter from the SIMD data word and negate the appropriate
input value.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Handle FPCR.AH in negation steps in SVE FCADD
Peter Maydell [Sat, 1 Feb 2025 16:39:40 +0000 (16:39 +0000)]
target/arm: Handle FPCR.AH in negation steps in SVE FCADD

The negation steps in FCADD must honour FPCR.AH's "don't change the
sign of a NaN" semantics.  Implement this in the same way we did for
the base ASIMD FCADD, by encoding FPCR.AH into the SIMD data field
passed to the helper and using that to decide whether to negate the
values.

The construction of neg_imag and neg_real were done to make it easy
to apply both in parallel with two simple logical operations.  This
changed with FPCR.AH, which is more complex than that. Switch to
an approach that follows the pseudocode more closely, by extracting
the 'rot=1' parameter from the SIMD data field and changing the
sign of the appropriate input value.

Note that there was a naming issue with neg_imag and neg_real.
They were named backward, with neg_imag being non-zero for rot=1,
and vice versa.  This was combined with reversed usage within the
loop, so that the negation in the end turned out correct.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Handle FPCR.AH in SVE FABD
Peter Maydell [Sat, 1 Feb 2025 16:39:39 +0000 (16:39 +0000)]
target/arm: Handle FPCR.AH in SVE FABD

Make the SVE FABD insn honour the FPCR.AH "don't negate the sign
of a NaN" semantics.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Handle FPCR.AH in SVE FABS
Peter Maydell [Sat, 1 Feb 2025 16:39:38 +0000 (16:39 +0000)]
target/arm: Handle FPCR.AH in SVE FABS

Make SVE FABS honour the FPCR.AH "don't negate the sign of a NaN"
semantics.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Handle FPCR.AH in SVE FNEG
Peter Maydell [Sat, 1 Feb 2025 16:39:37 +0000 (16:39 +0000)]
target/arm: Handle FPCR.AH in SVE FNEG

Make SVE FNEG honour the FPCR.AH "don't negate the sign of a NaN"
semantics.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Handle FPCR.AH in vector FABD
Peter Maydell [Sat, 1 Feb 2025 16:39:36 +0000 (16:39 +0000)]
target/arm: Handle FPCR.AH in vector FABD

Split the handling of vector FABD so that it calls a different set
of helpers when FPCR.AH is 1, which implement the "no negation of
the sign of a NaN" semantics.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Implement FPCR.AH handling for scalar FABS and FABD
Peter Maydell [Sat, 1 Feb 2025 16:39:35 +0000 (16:39 +0000)]
target/arm: Implement FPCR.AH handling for scalar FABS and FABD

FPCR.AH == 1 mandates that taking the absolute value of a NaN should
not change its sign bit.  This means we can no longer use
gen_vfp_abs*() everywhere but must instead generate slightly more
complex code when FPCR.AH is set.

Implement these semantics for scalar FABS and FABD.  This change also
affects all other instructions whose psuedocode calls FPAbs(); we
will extend the change to those instructions in following commits.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Implement FPCR.AH handling of negation of NaN
Peter Maydell [Sat, 1 Feb 2025 16:39:34 +0000 (16:39 +0000)]
target/arm: Implement FPCR.AH handling of negation of NaN

FPCR.AH == 1 mandates that negation of a NaN value should not flip
its sign bit.  This means we can no longer use gen_vfp_neg*()
everywhere but must instead generate slightly more complex code when
FPCR.AH is set.

Make this change for the scalar FNEG and for those places in
translate-a64.c which were previously directly calling
gen_vfp_neg*().

This change in semantics also affects any other instruction whose
pseudocode calls FPNeg(); in following commits we extend this
change to the other affected instructions.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Implement FPCR.AH semantics for SVE FMIN/FMAX vector
Peter Maydell [Sat, 1 Feb 2025 16:39:33 +0000 (16:39 +0000)]
target/arm: Implement FPCR.AH semantics for SVE FMIN/FMAX vector

Implement the FPCR.AH semantics for the SVE FMAX and FMIN
operations that take two vector operands.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Implement FPCR.AH semantics for SVE FMIN/FMAX immediate
Peter Maydell [Sat, 1 Feb 2025 16:39:32 +0000 (16:39 +0000)]
target/arm: Implement FPCR.AH semantics for SVE FMIN/FMAX immediate

Implement the FPCR.AH semantics for the SVE FMAX and FMIN operations
that take an immediate as the second operand.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Implement FPCR.AH semantics for SVE FMAXV and FMINV
Peter Maydell [Sat, 1 Feb 2025 16:39:31 +0000 (16:39 +0000)]
target/arm: Implement FPCR.AH semantics for SVE FMAXV and FMINV

Implement the FPCR.AH semantics for the SVE FMAXV and FMINV
vector-reduction-to-scalar max/min operations.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Implement FPCR.AH semantics for FMINP and FMAXP
Peter Maydell [Sat, 1 Feb 2025 16:39:30 +0000 (16:39 +0000)]
target/arm: Implement FPCR.AH semantics for FMINP and FMAXP

Implement the FPCR.AH semantics for the pairwise floating
point minimum/maximum insns FMINP and FMAXP.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Implement FPCR.AH semantics for FMAXV and FMINV
Peter Maydell [Sat, 1 Feb 2025 16:39:29 +0000 (16:39 +0000)]
target/arm: Implement FPCR.AH semantics for FMAXV and FMINV

Implement the FPCR.AH semantics for FMAXV and FMINV.  These are the
"recursively reduce all lanes of a vector to a scalar result" insns;
we just need to use the _ah_ helper for the reduction step when
FPCR.AH == 1.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Implement FPCR.AH semantics for vector FMIN/FMAX
Peter Maydell [Sat, 1 Feb 2025 16:39:28 +0000 (16:39 +0000)]
target/arm: Implement FPCR.AH semantics for vector FMIN/FMAX

Implement the FPCR.AH == 1 semantics for vector FMIN/FMAX, by
creating new _ah_ versions of the gvec helpers which invoke the
scalar fmin_ah and fmax_ah helpers on each element.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Implement FPCR.AH semantics for scalar FMIN/FMAX
Peter Maydell [Sat, 1 Feb 2025 16:39:27 +0000 (16:39 +0000)]
target/arm: Implement FPCR.AH semantics for scalar FMIN/FMAX

When FPCR.AH == 1, floating point FMIN and FMAX have some odd special
cases:

 * comparing two zeroes (even of different sign) or comparing a NaN
   with anything always returns the second argument (possibly
   squashed to zero)
 * denormal outputs are not squashed to zero regardless of FZ or FZ16

Implement these semantics in new helper functions and select them at
translate time if FPCR.AH is 1 for the scalar FMAX and FMIN insns.
(We will convert the other FMAX and FMIN insns in subsequent
commits.)

Note that FMINNM and FMAXNM are not affected.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Handle FPCR.NEP for NEP for FMUL, FMULX scalar by element
Peter Maydell [Sat, 1 Feb 2025 16:39:26 +0000 (16:39 +0000)]
target/arm: Handle FPCR.NEP for NEP for FMUL, FMULX scalar by element

do_fp3_scalar_idx() is used only for the FMUL and FMULX scalar by
element instructions; these both need to merge the result with the Rn
register when FPCR.NEP is set.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Handle FPCR.NEP for FCVTXN (scalar)
Peter Maydell [Sat, 1 Feb 2025 16:39:25 +0000 (16:39 +0000)]
target/arm: Handle FPCR.NEP for FCVTXN (scalar)

Unlike the other users of do_2misc_narrow_scalar(), FCVTXN (scalar)
is always double-to-single and must honour FPCR.NEP.  Implement this
directly in a trans function rather than using
do_2misc_narrow_scalar().

We still need gen_fcvtxn_sd() and the f_scalar_fcvtxn[] array for
the FCVTXN (vector) insn, so we move those down in the file to
where they are used.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Handle FPCR.NEP for scalar FABS and FNEG
Peter Maydell [Sat, 1 Feb 2025 16:39:24 +0000 (16:39 +0000)]
target/arm: Handle FPCR.NEP for scalar FABS and FNEG

Handle FPCR.NEP merging for scalar FABS and FNEG; this requires
an extra parameter to do_fp1_scalar_int(), since FMOV scalar
does not have the merging behaviour.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Handle FPCR.NEP in do_cvtf_scalar()
Peter Maydell [Sat, 1 Feb 2025 16:39:23 +0000 (16:39 +0000)]
target/arm: Handle FPCR.NEP in do_cvtf_scalar()

Handle FPCR.NEP in the operations handled by do_cvtf_scalar().

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Handle FPCR.NEP for 1-input scalar operations
Peter Maydell [Sat, 1 Feb 2025 16:39:22 +0000 (16:39 +0000)]
target/arm: Handle FPCR.NEP for 1-input scalar operations

Handle FPCR.NEP for the 1-input scalar operations.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Handle FPCR.NEP for BFCVT scalar
Peter Maydell [Sat, 1 Feb 2025 16:39:21 +0000 (16:39 +0000)]
target/arm: Handle FPCR.NEP for BFCVT scalar

Currently we implement BFCVT scalar via do_fp1_scalar().  This works
even though BFCVT is a narrowing operation from 32 to 16 bits,
because we can use write_fp_sreg() for float16. However, FPCR.NEP
support requires that we use write_fp_hreg_merging() for float16
outputs, so we can't continue to borrow the non-narrowing
do_fp1_scalar() function for this. Split out trans_BFCVT_s()
into its own implementation that honours FPCR.NEP.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Handle FPCR.NEP for 3-input scalar operations
Peter Maydell [Sat, 1 Feb 2025 16:39:20 +0000 (16:39 +0000)]
target/arm: Handle FPCR.NEP for 3-input scalar operations

Handle FPCR.NEP for the 3-input scalar operations which use
do_fmla_scalar_idx() and do_fmadd(), by making them call the
appropriate write_fp_*reg_merging() functions.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Define and use new write_fp_*reg_merging() functions
Peter Maydell [Sat, 1 Feb 2025 16:39:19 +0000 (16:39 +0000)]
target/arm: Define and use new write_fp_*reg_merging() functions

For FEAT_AFP's FPCR.NEP bit, we need to programmatically change the
behaviour of the writeback of the result for most SIMD scalar
operations, so that instead of zeroing the upper part of the result
register it merges the upper elements from one of the input
registers.

Provide new functions write_fp_*reg_merging() which can be used
instead of the existing write_fp_*reg() functions when we want this
"merge the result with one of the input registers if FPCR.NEP is
enabled" handling, and use them in do_fp3_scalar_with_fpsttype().

Note that (as documented in the description of the FPCR.NEP bit)
which input register to use as the merge source varies by
instruction: for these 2-input scalar operations, the comparison
instructions take from Rm, not Rn.

We'll extend this to also provide the merging behaviour for
the remaining scalar insns in subsequent commits.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Add FPCR.NEP to TBFLAGS
Peter Maydell [Sat, 1 Feb 2025 16:39:18 +0000 (16:39 +0000)]
target/arm: Add FPCR.NEP to TBFLAGS

For FEAT_AFP, we want to emit different code when FPCR.NEP is set, so
that instead of zeroing the high elements of a vector register when
we write the output of a scalar operation to it, we instead merge in
those elements from one of the source registers.  Since this affects
the generated code, we need to put FPCR.NEP into the TBFLAGS.

FPCR.NEP is treated as 0 when in streaming SVE mode and FEAT_SME_FA64
is not implemented or not enabled; we can implement this logic in
rebuild_hflags_a64().

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Use FPST_FPCR_AH for BFMLAL*, BFMLSL* insns
Peter Maydell [Sat, 1 Feb 2025 16:39:17 +0000 (16:39 +0000)]
target/arm: Use FPST_FPCR_AH for BFMLAL*, BFMLSL* insns

When FPCR.AH is 1, use FPST_FPCR_AH for:
 * AdvSIMD BFMLALB, BFMLALT
 * SVE BFMLALB, BFMLALT, BFMLSLB, BFMLSLT

so that they get the required behaviour changes.

We do this by making gen_gvec_op4_fpst() take an ARMFPStatusFlavour
rather than a bool is_fp16; existing callsites now select
FPST_FPCR_F16_A64 vs FPST_FPCR_A64 themselves rather than passing in
the boolean.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Use FPST_FPCR_AH for BFCVT* insns
Peter Maydell [Sat, 1 Feb 2025 16:39:16 +0000 (16:39 +0000)]
target/arm: Use FPST_FPCR_AH for BFCVT* insns

When FPCR.AH is 1, use FPST_FPCR_AH for:
 * AdvSIMD BFCVT, BFCVTN, BFCVTN2
 * SVE BFCVT, BFCVTNT

so that they get the required behaviour changes.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Use FPST_FPCR_AH for FRECPE, FRECPS, FRECPX, FRSQRTE, FRSQRTS
Peter Maydell [Sat, 1 Feb 2025 16:39:15 +0000 (16:39 +0000)]
target/arm: Use FPST_FPCR_AH for FRECPE, FRECPS, FRECPX, FRSQRTE, FRSQRTS

For the instructions FRECPE, FRECPS, FRECPX, FRSQRTE, FRSQRTS, use
FPST_FPCR_AH or FPST_FPCR_AH_F16 when FPCR.AH is 1, so that they get
the required behaviour changes.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Set up float_status to use for FPCR.AH=1 behaviour
Peter Maydell [Sat, 1 Feb 2025 16:39:14 +0000 (16:39 +0000)]
target/arm: Set up float_status to use for FPCR.AH=1 behaviour

When FPCR.AH is 1, the behaviour of some instructions changes:
 * AdvSIMD BFCVT, BFCVTN, BFCVTN2, BFMLALB, BFMLALT
 * SVE BFCVT, BFCVTNT, BFMLALB, BFMLALT, BFMLSLB, BFMLSLT
 * SME BFCVT, BFCVTN, BFMLAL, BFMLSL (these are all in SME2 which
   QEMU does not yet implement)
 * FRECPE, FRECPS, FRECPX, FRSQRTE, FRSQRTS

The behaviour change is:
 * the instructions do not update the FPSR cumulative exception flags
 * trapped floating point exceptions are disabled (a no-op for QEMU,
   which doesn't implement FPCR.{IDE,IXE,UFE,OFE,DZE,IOE})
 * rounding is always round-to-nearest-even regardless of FPCR.RMode
 * denormalized inputs and outputs are always flushed to zero, as if
   FPCR.{FZ,FIZ} is {1,1}
 * FPCR.FZ16 is still honoured for half-precision inputs

(See the Arm ARM DDI0487L.a section A1.5.9.)

We can provide all these behaviours with another pair of float_status fields
which we use only for these insns, when FPCR.AH is 1. These float_status
fields will always have:
 * flush_to_zero and flush_inputs_to_zero set for the non-F16 field
 * rounding mode set to round-to-nearest-even
and so the only FPCR fields they need to honour are DN and FZ16.

In this commit we only define the new fp_status fields and give them
the required behaviour when FPSR is updated.  In subsequent commits
we will arrange to use this new fp_status field for the instructions
that should be affected by FPCR.AH in this way.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Add FPCR.AH to tbflags
Peter Maydell [Sat, 1 Feb 2025 16:39:13 +0000 (16:39 +0000)]
target/arm: Add FPCR.AH to tbflags

We are going to need to generate different code in some cases when
FPCR.AH is 1.  For example:
 * Floating point neg and abs must not flip the sign bit of NaNs
 * some insns (FRECPE, FRECPS, FRECPX, FRSQRTE, FRSQRTS, and various
   BFCVT and BFM bfloat16 ops) need to use a different float_status
   to the usual one

Encode FPCR.AH into the A64 tbflags, so we can refer to it at
translate time.

Because we now have a bit in FPCR that affects codegen, we can't mark
the AArch64 FPCR register as being SUPPRESS_TB_END any more; writes
to it will now end the TB and trigger a regeneration of hflags.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Adjust exception flag handling for AH = 1
Peter Maydell [Sat, 1 Feb 2025 16:39:12 +0000 (16:39 +0000)]
target/arm: Adjust exception flag handling for AH = 1

When FPCR.AH = 1, some of the cumulative exception flags in the FPSR
behave slightly differently for A64 operations:
 * IDC is set when a denormal input is used without flushing
 * IXC (Inexact) is set when an output denormal is flushed to zero

Update vfp_get_fpsr_from_host() to do this.

Note that because half-precision operations never set IDC, we now
need to add float_flag_input_denormal_used to the set we mask out of
fp_status_f16_a64.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Adjust FP behaviour for FPCR.AH = 1
Peter Maydell [Sat, 1 Feb 2025 16:39:11 +0000 (16:39 +0000)]
target/arm: Adjust FP behaviour for FPCR.AH = 1

When FPCR.AH is set, various behaviours of AArch64 floating point
operations which are controlled by softfloat config settings change:
 * tininess and ftz detection before/after rounding
 * NaN propagation order
 * result of 0 * Inf + NaN
 * default NaN value

When the guest changes the value of the AH bit, switch these config
settings on the fp_status_a64 and fp_status_f16_a64 float_status
fields.

This requires us to make the arm_set_default_fp_behaviours() function
global, since we now need to call it from cpu.c and vfp_helper.c; we
move it to vfp_helper.c so it can be next to the new
arm_set_ah_fp_behaviours().

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2 months agotarget/arm: Implement FPCR.FIZ handling
Peter Maydell [Sat, 1 Feb 2025 16:39:10 +0000 (16:39 +0000)]
target/arm: Implement FPCR.FIZ handling

Part of FEAT_AFP is the new control bit FPCR.FIZ.  This bit affects
flushing of single and double precision denormal inputs to zero for
AArch64 floating point instructions.  (For half-precision, the
existing FPCR.FZ16 control remains the only one.)

FPCR.FIZ differs from FPCR.FZ in that if we flush an input denormal
only because of FPCR.FIZ then we should *not* set the cumulative
exception bit FPSR.IDC.

FEAT_AFP also defines that in AArch64 the existing FPCR.FZ only
applies when FPCR.AH is 0.

We can implement this by setting the "flush inputs to zero" state
appropriately when FPCR is written, and by not reflecting the
float_flag_input_denormal status flag into FPSR reads when it is the
result only of FPSR.FIZ.

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