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Shared Memory on CVMs? #68

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Teofil98 opened this issue Jul 4, 2024 · 0 comments
Open

Shared Memory on CVMs? #68

Teofil98 opened this issue Jul 4, 2024 · 0 comments

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@Teofil98
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Teofil98 commented Jul 4, 2024

Creating a shared memory region with qemu in the CVM case doesn't fail:

-device ivshmem-plain,memdev=hostmem -object memory-backend-file,size=1M,share=on,mem-path=</path/to/file/data.dat>,id=hostmem

The shared memory shows up as usual on the CVM like in the case of a normal vm

lspci

00:06.0 RAM memory: Red Hat, Inc. Inter-VM shared memory (rev 01)

lspci -vn

00:06.0 0500: 1af4:1110 (rev 01)
        Subsystem: 1af4:1100
        Flags: fast devsel
        Memory at c1002000 (32-bit, non-prefetchable) [size=256]
        Memory at 700000000000 (64-bit, prefetchable) [size=1M]

However, the user-space process hangs when trying to read/write using the shared memory region.
Would be interesting to see if we can get it to work.
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