[Qemu-commits] [qemu/qemu] 4b870d: hostmem-file: add offset option

[Richard Henderson]

  Branch: refs/heads/master
  Home:   https://github.com/qemu/qemu
  Commit: 4b870dc4d0c0895859d34d14ce0272a4bcbccf78
      
https://github.com/qemu/qemu/commit/4b870dc4d0c0895859d34d14ce0272a4bcbccf78
  Author: Alexander Graf <graf@amazon.com>
  Date:   2023-05-23 (Tue, 23 May 2023)

  Changed paths:
    M backends/hostmem-file.c
    M hw/virtio/vhost-user.c
    M include/exec/memory.h
    M include/exec/ram_addr.h
    M include/exec/ramblock.h
    M qapi/qom.json
    M qemu-options.hx
    M softmmu/memory.c
    M softmmu/physmem.c

  Log Message:
  -----------
  hostmem-file: add offset option

Add an option for hostmem-file to start the memory object at an offset
into the target file. This is useful if multiple memory objects reside
inside the same target file, such as a device node.

In particular, it's useful to map guest memory directly into /dev/mem
for experimentation.

To make this work consistently, also fix up all places in QEMU that
expect fd offsets to be 0.

Signed-off-by: Alexander Graf <graf@amazon.com>
Message-Id: <20230403221421.60877-1-graf@amazon.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Acked-by: Peter Xu <peterx@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>


  Commit: aa33508196f4e2da04625bee36e1f7be5b9267e7
      
https://github.com/qemu/qemu/commit/aa33508196f4e2da04625bee36e1f7be5b9267e7
  Author: Richard Henderson <richard.henderson@linaro.org>
  Date:   2023-05-23 (Tue, 23 May 2023)

  Changed paths:
    M backends/hostmem-file.c
    M hw/virtio/vhost-user.c
    M include/exec/memory.h
    M include/exec/ram_addr.h
    M include/exec/ramblock.h
    M qapi/qom.json
    M qemu-options.hx
    M softmmu/memory.c
    M softmmu/physmem.c

  Log Message:
  -----------
  Merge tag 'mem-2023-05-23' of https://github.com/davidhildenbrand/qemu into 
staging

Hi,

"Host Memory Backends" and "Memory devices" queue ("mem"):
- New "offset" option for memory-backend-file

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# gpg:                 aka "David Hildenbrand <davidhildenbrand@gmail.com>" 
[undefined]
# gpg:                 aka "David Hildenbrand <hildenbr@in.tum.de>" [unknown]
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* tag 'mem-2023-05-23' of https://github.com/davidhildenbrand/qemu:
  hostmem-file: add offset option

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>


Compare: https://github.com/qemu/qemu/compare/00f76608a68d...aa33508196f4