[PATCH-for-9.0] hw/i386/pc: Deprecate 64-bit CPUs on ISA-only PC machine
Per Daniel suggestion [*]:
isapc could arguably be restricted to just 32-bit CPU models,
because we should not need it to support any feature that didn't
exist prior to circa 1995. eg refuse to start with isapc, if 'lm'
is present in the CPU model for example.
[*] https://lore.kernel.org/qemu-devel/ZgQkS4RPmSt5Xa08@redhat.com/
Suggested-by: Daniel P. Berrangé <berrange(a)redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd(a)linaro.org>
---
docs/about/deprecated.rst | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
index 7b548519b5..345c35507f 100644
--- a/docs/about/deprecated.rst
+++ b/docs/about/deprecated.rst
@@ -208,6 +208,13 @@ is no longer packaged in any distro making it harder to run the
``check-tcg`` tests. Unless we can improve the testing situation there
is a chance the code will bitrot without anyone noticing.
+64-bit (x86_64) CPUs on the ``isapc`` machine (since 9.0)
+'''''''''''''''''''''''''''''''''''''''''''''''''''''''''
+
+The ``isapc`` machine aims to emulate old PC machine without PCI was
+generalized, so hardware available around 1995, before 64-bit intel
+CPUs were produced.
+
System emulator machines
------------------------
--
2.41.0