[PULL 1/5] docs: add supported host CPU architectures section

[marcandre . lureau]

From: Marc-André Lureau <marcandre.lureau@redhat.com>

I was looking for such documentation, but couldn't find it. Add it to
the build-platform.rst document.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
---
 docs/about/build-platforms.rst | 33 +++++++++++++++++++++++++++++++++
 docs/about/deprecated.rst      |  2 ++
 2 files changed, 35 insertions(+)

diff --git a/docs/about/build-platforms.rst b/docs/about/build-platforms.rst
index 692323609e..bcb1549721 100644
--- a/docs/about/build-platforms.rst
+++ b/docs/about/build-platforms.rst
@@ -29,6 +29,39 @@ The `Repology`_ site is a useful resource to identify
 currently shipped versions of software in various operating systems,
 though it does not cover all distros listed below.
 
+Supported host architectures
+----------------------------
+
+Those hosts are officially supported, with various accelerators:
+
+  .. list-table::
+   :header-rows: 1
+
+   * - CPU Architecture
+     - Accelerators
+   * - Arm
+     - kvm (64 bit only), tcg, xen
+   * - MIPS
+     - kvm, tcg
+   * - PPC
+     - kvm, tcg
+   * - RISC-V
+     - tcg
+   * - s390x
+     - kvm, tcg
+   * - SPARC
+     - tcg
+   * - x86
+     - hax, hvf (64 bit only), kvm, nvmm, tcg, whpx (64 bit only), xen
+
+Other host architectures are not supported. It is possible to build QEMU on an
+unsupported host architecture using the configure ``--enable-tcg-interpreter``
+option to enable the experimental TCI support, but note that this is very slow
+and is not recommended.
+
+Non-supported architectures may be removed in the future following the
+:ref:`deprecation process<Deprecated features>`.
+
 Linux OS, macOS, FreeBSD, NetBSD, OpenBSD
 -----------------------------------------
 
diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
index 9ee355ec0b..3c2be84d80 100644
--- a/docs/about/deprecated.rst
+++ b/docs/about/deprecated.rst
@@ -1,3 +1,5 @@
+.. _Deprecated features:
+
 Deprecated features
 ===================
 
-- 
2.33.0.113.g6c40894d24