[PATCH v5 0/2] KVM: arm64: Support FF-A direct messaging interfaces

[Yeoreum Yun]

Hi Per,

May I ask how this patch is progressing?

Thanks!

> Support FFA_MSG_SEND_DIRECT_REQ unconditionally.
> Support FFA_MSG_SEND_DIRECT_REQ2 if hypervisor negotiated version 1.2+.
> 
> Framework messages (FF-A control plane) are filtered out. For
> FFA_MSG_SEND_DIRECT_REQ, we look at flags in w2. Messages using the REQ2
> interface are always partition messages.
> 
> The second patch was part of a previous patch set [0] but was dropped
> since the use case was unclear. A clear use case has now appeared: use
> TPM device with CRB over FF-A when kernel boots with pkvm [1].
> 
> Tested by booting Android under QEMU.
> 
> Best Regards,
> Per
> 
> [0]: https://lore.kernel.org/all/20250730-virtio-msg-ffa-v9-0-7f1b55c8d149@google.com/
> [1]: https://lore.kernel.org/all/20251027191729.1704744-1-yeoreum.yun@arm.com/
>  
> 
> Signed-off-by: Per Larsen <perlarsen at google.com>
> ---
> Changes in v5:
> - 1/2: do_ffa_direct_msg: validate that sender is HOST_FFA_ID.
> - Link to v4: https://lore.kernel.org/r/20260109-host-direct-messages-v4-0-95da4221d186@google.com
> 
> Changes in v4:
> - 1/2: do_ffa_direct_msg: check that flag in w2 is zero; drop unused vm_handle parameter.
> - 2/2: ffa_call_supported: simplify logic by reordering cases.
> -      do_ffa_direct_msg: switch polarity of check and update comment.
> - Link to v3: https://lore.kernel.org/r/20251119-host-direct-messages-v3-0-c74d04944b26@google.com
> 
> Changes in v3:
> - Filter out framework messages as suggested by Will Deacon. Update cover letter accordingly.
> - Update trailers: Reviewed-by: Yeoreum Yun <yeoreum.yun at arm.com>
> - Link to v2: https://lore.kernel.org/r/20251030-host-direct-messages-v2-0-9f27cef36730@google.com
> 
> Changes in v2:
> - 1/2: Drop support for FFA_ID_GET interface in host handler.
> - Link to v1: https://lore.kernel.org/r/20251030-host-direct-messages-v1-0-463e57871c8f@google.com
> 
> ---
> Per Larsen (1):
>       KVM: arm64: Support FFA_MSG_SEND_DIRECT_REQ2 in host handler
> 
> Sebastian Ene (1):
>       KVM: arm64: Support FFA_MSG_SEND_DIRECT_REQ in host handler
> 
>  arch/arm64/kvm/hyp/nvhe/ffa.c | 39 ++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 38 insertions(+), 1 deletion(-)
> ---
> base-commit: 6c790212c588fddeb0d852f2790840753bb604b1
> change-id: 20251029-host-direct-messages-5201d7f55abd
> 
> Best regards,
> -- 
> Per Larsen <perlarsen at google.com>
> 
> 

-- 
Sincerely,
Yeoreum Yun