On Sat, Apr 12, 2025 at 09:43:15AM -0700, Richard Henderson wrote: > With acce728cbc6c we disallowed configuring 64-bit guests on > 32-bit hosts, but forgot to document that in removed-features. > > Signed-off-by: Richard Henderson <richard.hender...@linaro.org> > --- > docs/about/removed-features.rst | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/docs/about/removed-features.rst b/docs/about/removed-features.rst > index 2527a91795..790a5e481c 100644 > --- a/docs/about/removed-features.rst > +++ b/docs/about/removed-features.rst > @@ -858,6 +858,15 @@ QEMU. Since all recent x86 hardware from the past >10 > years is > capable of the 64-bit x86 extensions, a corresponding 64-bit OS should > be used instead. > > +32-bit hosts for 64-bit guests (removed in 10.0) > +'''''''''''''''''''''''''''''''''''''''''''''''' > + > +In general, 32-bit hosts cannot support the memory space or atomicity > +requirements of 64-bit guests. Prior to 10.0, QEMU attempted to > +work around the atomicity issues in system mode by running all vCPUs > +in a single thread context; in user mode atomicity was simply broken. > +From 10.0, QEMU has disabled configuration of 64-bit guests on 32-bit hosts. > + > Guest Emulator ISAs > -------------------
Reviewed-by: Daniel P. Berrangé <berra...@redhat.com> With regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
