[PATCH v11 2/5] vhost_user: header defines for add/rem mem region

[Maxime Coquelin]

On Tue, May 5, 2026 at 7:53 AM <pravin.bathija at dell.com> wrote:

> From: Pravin M Bathija <pravin.bathija at dell.com>
>
> The changes in this file cover the enum message requests for
> supporting add/remove memory regions. The front-end vhost-user
> client sends messages like get max memory slots, add memory region
> and remove memory region which are covered in these changes which
> are on the vhost-user back-end. The changes also include data structure
> definition of memory region to be added/removed. The data structure
> VhostUserMsg has been changed to include the memory region.
>
> Signed-off-by: Pravin M Bathija <pravin.bathija at dell.com>
> ---
>  lib/vhost/vhost_user.h | 9 +++++++++
>  1 file changed, 9 insertions(+)
>
> diff --git a/lib/vhost/vhost_user.h b/lib/vhost/vhost_user.h
> index ef486545ba..f8d921f7f1 100644
> --- a/lib/vhost/vhost_user.h
> +++ b/lib/vhost/vhost_user.h
> @@ -67,6 +67,9 @@ typedef enum VhostUserRequest {
>         VHOST_USER_POSTCOPY_END = 30,
>         VHOST_USER_GET_INFLIGHT_FD = 31,
>         VHOST_USER_SET_INFLIGHT_FD = 32,
> +       VHOST_USER_GET_MAX_MEM_SLOTS = 36,
> +       VHOST_USER_ADD_MEM_REG = 37,
> +       VHOST_USER_REM_MEM_REG = 38,
>         VHOST_USER_SET_STATUS = 39,
>         VHOST_USER_GET_STATUS = 40,
>  } VhostUserRequest;
> @@ -91,6 +94,11 @@ typedef struct VhostUserMemory {
>         VhostUserMemoryRegion regions[VHOST_MEMORY_MAX_NREGIONS];
>  } VhostUserMemory;
>
> +typedef struct VhostUserSingleMemReg {
> +       uint64_t padding;
> +       VhostUserMemoryRegion region;
> +} VhostUserSingleMemReg;
> +
>  typedef struct VhostUserLog {
>         uint64_t mmap_size;
>         uint64_t mmap_offset;
> @@ -186,6 +194,7 @@ typedef struct __rte_packed_begin VhostUserMsg {
>                 struct vhost_vring_state state;
>                 struct vhost_vring_addr addr;
>                 VhostUserMemory memory;
> +               VhostUserSingleMemReg memory_single;
>                 VhostUserLog    log;
>                 struct vhost_iotlb_msg iotlb;
>                 VhostUserCryptoSessionParam crypto_session;
> --
> 2.43.0
>
>

Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>

Thanks,
Maxime
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