linux-kernel - [PATCH v2 1/2] KVM: arm64: Support FFA_MSG_SEND_DIRECT

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Message-Id: <20251030-host-direct-messages-v2-1-9f27cef36730@google.com>
Date: Thu, 30 Oct 2025 15:49:16 +0000
From: Per Larsen via B4 Relay <devnull+perlarsen.google.com@...nel.org>
To: Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>, 
 Joey Gouly <joey.gouly@....com>, Suzuki K Poulose <suzuki.poulose@....com>, 
 Zenghui Yu <yuzenghui@...wei.com>, 
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
 Yeoreum Yun <yeoreum.yun@....com>, Ben Horgan <ben.horgan@....com>
Cc: Armelle Laine <armellel@...gle.com>, 
 Sebastien Ene <sebastianene@...gle.com>, 
 linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev, 
 linux-kernel@...r.kernel.org, Per Larsen <perlarsen@...gle.com>
Subject: [PATCH v2 1/2] KVM: arm64: Support FFA_MSG_SEND_DIRECT_REQ in host
 handler

From: Sebastian Ene <sebastianene@...gle.com>

Allow direct messages to be forwarded from the host.

Signed-off-by: Sebastian Ene <sebastianene@...gle.com>
Signed-off-by: Per Larsen <perlarsen@...gle.com>
---
 arch/arm64/kvm/hyp/nvhe/ffa.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c
index 4e16f9b96f637599873b16148c6e40cf1210aa3e..bb38ee7c86bad1646c16c562127eb3bef6297a84 100644
--- a/arch/arm64/kvm/hyp/nvhe/ffa.c
+++ b/arch/arm64/kvm/hyp/nvhe/ffa.c
@@ -857,6 +857,15 @@ static void do_ffa_part_get(struct arm_smccc_1_2_regs *res,
 	hyp_spin_unlock(&host_buffers.lock);
 }
 
+static void do_ffa_direct_msg(struct arm_smccc_1_2_regs *res,
+			      struct kvm_cpu_context *ctxt,
+			      u64 vm_handle)
+{
+	struct arm_smccc_1_2_regs *args = (void *)&ctxt->regs.regs[0];
+
+	arm_smccc_1_2_smc(args, res);
+}
+
 bool kvm_host_ffa_handler(struct kvm_cpu_context *host_ctxt, u32 func_id)
 {
 	struct arm_smccc_1_2_regs res;
@@ -915,6 +924,10 @@ bool kvm_host_ffa_handler(struct kvm_cpu_context *host_ctxt, u32 func_id)
 	case FFA_PARTITION_INFO_GET:
 		do_ffa_part_get(&res, host_ctxt);
 		goto out_handled;
+	case FFA_MSG_SEND_DIRECT_REQ:
+	case FFA_FN64_MSG_SEND_DIRECT_REQ:
+		do_ffa_direct_msg(&res, host_ctxt, HOST_FFA_ID);
+		goto out_handled;
 	}
 
 	if (ffa_call_supported(func_id))

-- 
2.51.1.851.g4ebd6896fd-goog