Re: [PATCH v4] hostmem-file: add offset option

[Stefan Hajnoczi]

On Sat, Apr 01, 2023 at 12:42:57PM +0000, Alexander Graf wrote:
> 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.
> 
> Signed-off-by: Alexander Graf <graf@amazon.com>
> Reviewed-by: Stefan Hajnoczi <stefanha@gmail.com>
> 
> ---
> 
> v1 -> v2:
> 
>   - add qom documentation
>   - propagate offset into truncate, size and alignment checks
> 
> v2 -> v3:
> 
>   - failed attempt at fixing typo
> 
> v2 -> v4:
> 
>   - fix typo
> ---
>  backends/hostmem-file.c | 40 +++++++++++++++++++++++++++++++++++++++-
>  include/exec/memory.h   |  2 ++
>  include/exec/ram_addr.h |  3 ++-
>  qapi/qom.json           |  5 +++++
>  qemu-options.hx         |  6 +++++-
>  softmmu/memory.c        |  3 ++-
>  softmmu/physmem.c       | 14 ++++++++++----
>  7 files changed, 65 insertions(+), 8 deletions(-)

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

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