Re: [PATCH v2 4/6] docs/about/deprecated: Deprecate the qemu-system-arm binary

On Thu, 2 Mar 2023 at 16:31, Thomas Huth <thuth(a)redhat.com&gt; wrote: > > qemu-system-aarch64 is a proper superset of qemu-system-arm, > and the latter was mainly still required for 32-bit KVM support. > But this 32-bit KVM arm support has been dropped in the Linux > kernel a couple of years ago already, so we don't really need > qemu-system-arm anymore, thus deprecated it now. > > Signed-off-by: Thomas Huth <thuth(a)redhat.com&gt; > --- > docs/about/deprecated.rst | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst > index a30aa8dfdf..21ce70b5c9 100644 > --- a/docs/about/deprecated.rst > +++ b/docs/about/deprecated.rst > @@ -45,6 +45,16 @@ run 32-bit guests by selecting a 32-bit CPU model, including KVM support > on x86_64 hosts. Thus users are recommended to reconfigure their systems > to use the ``qemu-system-x86_64`` binary instead. > > +``qemu-system-arm`` binary (since 8.0) > +'''''''''''''''''''''''''''''''''''''' > + > +``qemu-system-aarch64`` is a proper superset of ``qemu-system-arm``. I think this is not quite true -- at the moment if you want "every feature we implement, 32-bit" the only way to get that is 'qemu-system-arm -cpu max'. The '-cpu max' on qemu-system-aarch64 is 64-bit, and we don't implement for TCG the "-cpu max,aarch64=off" syntax that we do for KVM that would let the user say "no 64-bit support".