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docs: Don't mention "-mem-path" in multi-process.rst 

"-mem-path" corresponds to "memory-backend-file,share=off" and,
therefore, creates a private COW mapping of the file. For multi-proces
QEMU, we need proper shared file-backed memory.

Let's make that clearer.

Message-ID: <20230906120503.359863-9-david@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
This commit is contained in:
David Hildenbrand 2023-09-06 14:05:00 +02:00
parent ca01f1b89b
commit 9e6180d22c
1 changed files with 3 additions and 2 deletions
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docs/devel/multi-process.rst
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@ -409,8 +409,9 @@ the initial messages sent to the emulation process is a guest memory
table. Each entry in this table consists of a file descriptor and size table. Each entry in this table consists of a file descriptor and size
that the emulation process can ``mmap()`` to directly access guest that the emulation process can ``mmap()`` to directly access guest
memory, similar to ``vhost_user_set_mem_table()``. Note guest memory memory, similar to ``vhost_user_set_mem_table()``. Note guest memory
must be backed by file descriptors, such as when QEMU is given the must be backed by shared file-backed memory, for example, using
*-mem-path* command line option. *-object memory-backend-file,share=on* and setting that memory backend
as RAM for the machine.
IOMMU operations IOMMU operations
^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^