accel: Remove HAX accelerator

HAX is deprecated since commits 73741fd ("MAINTAINERS: Abort
HAXM maintenance") and 90c167a ("docs/about/deprecated: Mark
HAXM in QEMU as deprecated"), released in v8.0.0.

Per the latest HAXM release (v7.8 [*]), the latest QEMU supported
is v7.2:

  Note: Up to this release, HAXM supports QEMU from 2.9.0 to 7.2.0.

The next commit (intel/haxm@da1b8ec072)
added:

  HAXM v7.8.0 is our last release and we will not accept
  pull requests or respond to issues after this.

It became very hard to build and test HAXM. Its previous
maintainers made it clear they won't help.  It doesn't seem to be
a very good use of QEMU maintainers to spend their time in a dead
project. Save our time by removing this orphan zombie code.

[*] https://github.com/intel/haxm/releases/tag/v7.8.0

Reviewed-by: Richard Henderson <[email protected]>
Acked-by: Markus Armbruster <[email protected]>
Signed-off-by: Philippe Mathieu-Daudé <[email protected]>
Reviewed-by: Thomas Huth <[email protected]>
Reviewed-by: Alex Bennée <[email protected]>
Message-Id: <[email protected]>

Author: philmd

MAINTAINERS

@@ -543,14 +543,6 @@ F: include/sysemu/xen.h
 F: include/sysemu/xen-mapcache.h
 F: stubs/xen-hw-stub.c
 
-Guest CPU Cores (HAXM)
----------------------
-X86 HAXM CPUs
-S: Orphan
-F: accel/stubs/hax-stub.c
-F: include/sysemu/hax.h
-F: target/i386/hax/
-
 Guest CPU Cores (NVMM)
 ----------------------
 NetBSD Virtual Machine Monitor (NVMM) CPU support

accel/Kconfig

@@ -4,9 +4,6 @@ config WHPX
 config NVMM
     bool
 
-config HAX
-    bool
-
 config HVF
     bool
 

accel/stubs/hax-stub.c

@@ -1,5 +1,4 @@
 sysemu_stubs_ss = ss.source_set()
-sysemu_stubs_ss.add(when: 'CONFIG_HAX', if_false: files('hax-stub.c'))
 sysemu_stubs_ss.add(when: 'CONFIG_XEN', if_false: files('xen-stub.c'))
 sysemu_stubs_ss.add(when: 'CONFIG_KVM', if_false: files('kvm-stub.c'))
 sysemu_stubs_ss.add(when: 'CONFIG_TCG', if_false: files('tcg-stub.c'))

accel/stubs/meson.build

@@ -52,7 +52,7 @@ Those hosts are officially supported, with various accelerators:
    * - SPARC
      - tcg
    * - x86
-     - hax, hvf (64 bit only), kvm, nvmm, tcg, whpx (64 bit only), xen
+     - hvf (64 bit only), kvm, nvmm, tcg, whpx (64 bit only), xen
 
 Other host architectures are not supported. It is possible to build QEMU system
 emulation on an unsupported host architecture using the configure

docs/about/build-platforms.rst

@@ -105,12 +105,6 @@ Use ``-machine hpet=off`` instead.
 The ``-no-acpi`` setting has been turned into a machine property.
 Use ``-machine acpi=off`` instead.
 
-``-accel hax`` (since 8.0)
-''''''''''''''''''''''''''
-
-The HAXM project has been retired (see https://github.com/intel/haxm#status).
-Use "whpx" (on Windows) or "hvf" (on macOS) instead.
-
 ``-async-teardown`` (since 8.1)
 '''''''''''''''''''''''''''''''
 

docs/about/deprecated.rst

@@ -8,7 +8,7 @@ QEMU can be used in several different ways. The most common is for
 :ref:`System Emulation`, where it provides a virtual model of an
 entire machine (CPU, memory and emulated devices) to run a guest OS.
 In this mode the CPU may be fully emulated, or it may work with a
-hypervisor such as KVM, Xen, Hax or Hypervisor.Framework to allow the
+hypervisor such as KVM, Xen or Hypervisor.Framework to allow the
 guest to run directly on the host CPU.
 
 The second supported way to use QEMU is :ref:`User Mode Emulation`,

docs/about/index.rst

@@ -659,15 +659,18 @@ Use ``Icelake-Server`` instead.
 System accelerators
 -------------------
 
-Userspace local APIC with KVM (x86, removed 8.0)
-''''''''''''''''''''''''''''''''''''''''''''''''
+Userspace local APIC with KVM (x86, removed in 8.0)
+'''''''''''''''''''''''''''''''''''''''''''''''''''
 
 ``-M kernel-irqchip=off`` cannot be used on KVM if the CPU model includes
 a local APIC.  The ``split`` setting is supported, as is using ``-M
 kernel-irqchip=off`` when the CPU does not have a local APIC.
 
-System accelerators
--------------------
+HAXM (``-accel hax``) (removed in 8.2)
+''''''''''''''''''''''''''''''''''''''
+
+The HAXM project has been retired (see https://github.com/intel/haxm#status).
+Use "whpx" (on Windows) or "hvf" (on macOS) instead.
 
 MIPS "Trap-and-Emulate" KVM support (removed in 8.0)
 ''''''''''''''''''''''''''''''''''''''''''''''''''''

docs/about/removed-features.rst

@@ -6,7 +6,7 @@ System Emulation
 
 This section of the manual is the overall guide for users using QEMU
 for full system emulation (as opposed to user-mode emulation).
-This includes working with hypervisors such as KVM, Xen, Hax
+This includes working with hypervisors such as KVM, Xen
 or Hypervisor.Framework.
 
 .. toctree::

docs/system/index.rst

@@ -21,9 +21,6 @@ Tiny Code Generator (TCG) capable of emulating many CPUs.
   * - Xen
     - Linux (as dom0)
     - Arm, x86
-  * - Intel HAXM (hax)
-    - Linux, Windows
-    - x86
   * - Hypervisor Framework (hvf)
     - MacOS
     - x86 (64 bit only), Arm (64 bit only)