Re: [PATCH V3] memory: RAM_NAMED_FILE flag

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

On 7/6/23 17:18, Steve Sistare wrote:
> migrate_ignore_shared() is an optimization that avoids copying memory
> that is visible and can be mapped on the target.  However, a
> memory-backend-ram or a memory-backend-memfd block with the RAM_SHARED
> flag set is not migrated when migrate_ignore_shared() is true.  This is
> wrong, because the block has no named backing store, and its contents will
> be lost.  To fix, ignore shared memory iff it is a named file.  Define a
> new flag RAM_NAMED_FILE to distinguish this case.
> 
> Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
> Reviewed-by: Peter Xu <peterx@redhat.com>
> ---
>   backends/hostmem-file.c   | 1 +
>   include/exec/cpu-common.h | 1 +
>   include/exec/memory.h     | 3 +++
>   migration/ram.c           | 3 ++-
>   qapi/migration.json       | 4 ++--
>   softmmu/physmem.c         | 7 ++++++-
>   6 files changed, 15 insertions(+), 4 deletions(-)

I'm taking this in my next PR, thanks.