On Mon, Feb 22, 2021 at 04:10:14PM +0000, Stefan Hajnoczi wrote: > vhost-user requires -object memory-backend-*,share=on option so that QEMU uses > mmap(MAP_SHARED) on guest RAM that is shared with the vhost-user device > backend > process. This is needed so the QEMU process sees changes made by the > vhost-user > device backend process, and vice versa. > > Today QEMU and the vhost-user device process will start up and then fail with > a > confusing error message if the user forgot to specify share=on. > > This patch series adds a warning letting the user know that share=on is > required. > > Stefan Hajnoczi (3): > tests/qtest/vhost-user-test: use share=on with memfd > memory: add memory_region_is_mapped_shared() > vhost-user: warn when guest RAM is not shared > > include/exec/memory.h | 11 +++++++++++ > hw/virtio/vhost-user.c | 20 ++++++++++++++++---- > softmmu/memory.c | 6 ++++++ > tests/qtest/vhost-user-test.c | 2 +- > 4 files changed, 34 insertions(+), 5 deletions(-)
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