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Thu, 30 Apr 2026 19:30:48 -0700 (PDT) Message-ID: Date: Thu, 30 Apr 2026 19:30:46 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 0/2] KVM: arm64: Support FF-A direct messaging interfaces To: Yeoreum Yun , perlarsen@google.com Cc: Marc Zyngier , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Ben Horgan , Oliver Upton , Armelle Laine , Sebastien Ene , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org References: <20260121-host-direct-messages-v5-0-2c1614c94e80@google.com> Content-Language: en-US From: Per Larsen In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi Yeoreum, Sorry to keep you waiting; I'm addressing v5 feedback now. Per On 4/30/26 2:40 PM, Yeoreum Yun wrote: > 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 >> --- >> 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 >> - 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 >> >> >