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RE: [PATCH 0/2][RFC] exclude ivshmem mr from vhost sections
From: |
Wangxin (Alexander) |
Subject: |
RE: [PATCH 0/2][RFC] exclude ivshmem mr from vhost sections |
Date: |
Fri, 4 Sep 2020 04:36:21 +0000 |
Ping.
>
> The ivshmem me now mapped to vhost memory regions, and it reduces
> the number of available memslots of vhost backend, which may
> causes vhost backend memory slots limit check failure in
> vhost dev init.
>
> Since ivshmem_bar2 not normal RAM in Guest, and it shouldn't
> have vhost DMAing into them, exclude it from the vhost sections.
>
> The 1st patch re-spin Dave's patch, see link
> https://lists.nongnu.org/archive/html/qemu-devel/2020-01/msg02370.html
>
> However, I'm not sure is there any side effects, or maybe it's
> better to add a new device property like 'novhost/nodma'?
>
> Thanks,
> Xin
>
> Wang Xin (2):
> memory: Allow a MemoryRegion to be marked no_vhost
> misc/ivshmem: Mark shared memory regions as no vhost
>
> hw/misc/ivshmem.c | 2 ++
> hw/virtio/vhost.c | 5 ++++-
> include/exec/memory.h | 21 +++++++++++++++++++++
> softmmu/memory.c | 15 +++++++++++++++
> 4 files changed, 42 insertions(+), 1 deletion(-)
>
> --
> 2.26.0.windows.1
>
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