On Tue, Nov 30, 2021 at 10:28:35AM +0100, David Hildenbrand wrote: > Support VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE in QEMU, which indicates to > a guest that we don't support reading unplugged memory. We indicate > the feature based on a new "unplugged-inaccessible" property available > for x86 targets only (the only ones with legacy guests). Guests that don't > support VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE will fail initialization if > indicated/required by the hypervisor. > > For example, Linux guests starting with v5.16 will support > VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE. > > For future targets that don't have legacy guests (especially arm64), we'll > always indicate VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE. > > More details can be found in the description of patch #2. > > " > For existing compat machines, the property will default to "off", to > not change the behavior but eventually warn about a problematic setup. > Short-term, we'll set the property default to "auto" for new QEMU machines. > Mid-term, we'll set the property default to "on" for new QEMU machines. > Long-term, we'll deprecate the parameter and disallow legacy guests > completely. > " > > TODO: Once 6.2 was release, adjust patch #3. Replace patch #1 by a proper > Linux header sync.
oh so it's not for 6.2. got it. > Cc: "Michael S. Tsirkin" <m...@redhat.com> > Cc: Marcel Apfelbaum <marcel.apfelb...@gmail.com> > Cc: Paolo Bonzini <pbonz...@redhat.com> > Cc: Richard Henderson <richard.hender...@linaro.org> > Cc: Eduardo Habkost <ehabk...@redhat.com> > Cc: Gavin Shan <gs...@redhat.com> > Cc: Hui Zhu <teawa...@gmail.com> > Cc: Sebastien Boeuf <sebastien.bo...@intel.com> > Cc: Pankaj Gupta <pankaj.gupta.li...@gmail.com> > > David Hildenbrand (3): > linux-headers: sync VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE > virtio-mem: Support VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE > virtio-mem: Set "unplugged-inaccessible=auto" for the 6.2 machine on > x86 > > hw/i386/pc.c | 1 + > hw/virtio/virtio-mem.c | 63 +++++++++++++++++++++ > include/hw/virtio/virtio-mem.h | 8 +++ > include/standard-headers/linux/virtio_mem.h | 9 ++- > 4 files changed, 78 insertions(+), 3 deletions(-) > > -- > 2.31.1