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[PATCH v4 08/11] docs: Don't mention "-mem-path" in multi-process.rst
From: |
David Hildenbrand |
Subject: |
[PATCH v4 08/11] docs: Don't mention "-mem-path" in multi-process.rst |
Date: |
Wed, 6 Sep 2023 14:05:00 +0200 |
"-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.
Signed-off-by: David Hildenbrand <david@redhat.com>
---
docs/devel/multi-process.rst | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/docs/devel/multi-process.rst b/docs/devel/multi-process.rst
index e4801751f2..4ef539c0b0 100644
--- a/docs/devel/multi-process.rst
+++ b/docs/devel/multi-process.rst
@@ -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
that the emulation process can ``mmap()`` to directly access guest
memory, similar to ``vhost_user_set_mem_table()``. Note guest memory
-must be backed by file descriptors, such as when QEMU is given the
-*-mem-path* command line option.
+must be backed by shared file-backed memory, for example, using
+*-object memory-backend-file,share=on* and setting that memory backend
+as RAM for the machine.
IOMMU operations
^^^^^^^^^^^^^^^^
--
2.41.0
- [PATCH v4 00/11] memory-backend-file related improvements and VM templating support, David Hildenbrand, 2023/09/06
- [PATCH v4 01/11] nvdimm: Reject writing label data to ROM instead of crashing QEMU, David Hildenbrand, 2023/09/06
- [PATCH v4 02/11] softmmu/physmem: Distinguish between file access mode and mmap protection, David Hildenbrand, 2023/09/06
- [PATCH v4 03/11] backends/hostmem-file: Add "rom" property to support VM templating with R/O files, David Hildenbrand, 2023/09/06
- [PATCH v4 05/11] softmmu/physmem: Bail out early in ram_block_discard_range() with readonly files, David Hildenbrand, 2023/09/06
- [PATCH v4 08/11] docs: Don't mention "-mem-path" in multi-process.rst,
David Hildenbrand <=
- [PATCH v4 04/11] softmmu/physmem: Remap with proper protection in qemu_ram_remap(), David Hildenbrand, 2023/09/06
- [PATCH v4 09/11] docs: Start documenting VM templating, David Hildenbrand, 2023/09/06
- [PATCH v4 10/11] softmmu/physmem: Hint that "readonly=on, rom=off" exists when opening file R/W for private mapping fails, David Hildenbrand, 2023/09/06
- [PATCH v4 11/11] machine: Improve error message when using default RAM backend id, David Hildenbrand, 2023/09/06
- [PATCH v4 07/11] softmmu/physmem: Never return directories from file_ram_open(), David Hildenbrand, 2023/09/06
- [PATCH v4 06/11] softmmu/physmem: Fail creation of new files in file_ram_open() with readonly=true, David Hildenbrand, 2023/09/06
- Re: [PATCH v4 00/11] memory-backend-file related improvements and VM templating support, David Hildenbrand, 2023/09/11