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Re: [PATCH 0/3] vhost-user: warn when guest RAM is not shared
From: |
Stefan Hajnoczi |
Subject: |
Re: [PATCH 0/3] vhost-user: warn when guest RAM is not shared |
Date: |
Tue, 11 May 2021 09:21:28 +0100 |
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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