From nobody Tue Dec 2 02:32:11 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 79ED323C4F3; Wed, 19 Nov 2025 02:08:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763518094; cv=none; b=hZ1OwGkEeDUTcoFlOQr+Ynkq4oiCdFq0qochZwY8cLsfYKJpZY7nQq4FprgJ9XjJ11/HwNh8A4RefyE555uXbEkRsrEc88FBvSOqST8dOh/gGlw4i281RyufehodlQ2TKEFIb+8xZti7RlSEr609hXEUfJUS/3XBdQGBk24UIVw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763518094; c=relaxed/simple; bh=H+kRv/J7t1po25GngUG56ddLxp2HEOwjoVtlZSWF844=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=gqMr0JMBenwqJfvXb6U4UPexkobHPmHjnNwA2ZC00YJmeP14PKs+c+MQn8IqVsS0jMLs8FwaqugpPnkUjBfcypZ0VecHfQsab67d2aCtjZFu+zP9uN6cG5jWDaGkntHH/FUc1chX1wud5FRAjIcXgNHo6mfy1oE4SYocn0AnweU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LpAJrk13; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="LpAJrk13" Received: by smtp.kernel.org (Postfix) with ESMTPS id 6310AC19424; Wed, 19 Nov 2025 02:08:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763518093; bh=H+kRv/J7t1po25GngUG56ddLxp2HEOwjoVtlZSWF844=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=LpAJrk13nPP2SlPaWB6AU7g0NfGgRn1tDlaiP385ouiDdULevDzu2orHT5ohlXkuf 4ZzODc9cLLetih33z78f1weW7v/NL7QEDLptLRHPf+yrQZsrczqFS0F/z5ssiecGJR SKpqivlHvFIr0z+r2bhsdpjMSaySgMy5xWJjBSJx8Em6ugj83kvqqfjfY3LSvX3Yld S/BwQamrck1b2hSG9ybWlyWCriG60nH3cvtZ5Q00+Gxf2NaLWYUIHPHBClOqYwPB18 VjdHyzCYM+8CmYz41qpfB6f4L9EnMmka5FLtNFlPwRMZ5dunvnvlVf3aslI088tu0U b8rcW6ihefxow== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 28904CF256A; Wed, 19 Nov 2025 02:08:13 +0000 (UTC) From: Per Larsen via B4 Relay Date: Wed, 19 Nov 2025 02:07:53 +0000 Subject: [PATCH v3 1/2] KVM: arm64: Support FFA_MSG_SEND_DIRECT_REQ in host handler Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251119-host-direct-messages-v3-1-c74d04944b26@google.com> References: <20251119-host-direct-messages-v3-0-c74d04944b26@google.com> In-Reply-To: <20251119-host-direct-messages-v3-0-c74d04944b26@google.com> To: Marc Zyngier , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Yeoreum Yun , Ben Horgan , Oliver Upton Cc: Armelle Laine , Sebastien Ene , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, Per Larsen X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1763518092; l=2269; i=perlarsen@google.com; s=20250508; h=from:subject:message-id; bh=q3WBYqBe9S24LJHsUs3M7p45BHiGyAz2s8dd2txWDcY=; b=ldeAB4/+ahQM8FZv/p6Cw6O/R+OolwSADHkdW5wYWA2I4+XWTN0Dx0AjQbjZjgwIiwdhSjLA2 FPtfg9zUQyRDLkqqXhpQeQyQ4g5UoUXvQ9lj9nQysps/4e18BHaNe0t X-Developer-Key: i=perlarsen@google.com; a=ed25519; pk=jjc/Ta4VmrLRmMoahP6d1mBcKzvWU+nsmdtYe2oS2kQ= X-Endpoint-Received: by B4 Relay for perlarsen@google.com/20250508 with auth_id=402 X-Original-From: Per Larsen Reply-To: perlarsen@google.com From: Sebastian Ene Allow direct messages to be forwarded from the host. The host should not be sending framework messages so they are filtered out. Signed-off-by: Sebastian Ene Reviewed-by: Yeoreum Yun Signed-off-by: Per Larsen --- arch/arm64/kvm/hyp/nvhe/ffa.c | 22 ++++++++++++++++++++++ include/linux/arm_ffa.h | 3 +++ 2 files changed, 25 insertions(+) diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c index 58b7d0c477d7fce235fc70d089d175c7879861b5..a38a3ab497e5eac11777109684a= 33f02d88d09a1 100644 --- a/arch/arm64/kvm/hyp/nvhe/ffa.c +++ b/arch/arm64/kvm/hyp/nvhe/ffa.c @@ -862,6 +862,23 @@ static void do_ffa_part_get(struct arm_smccc_1_2_regs = *res, hyp_spin_unlock(&host_buffers.lock); } =20 +static void do_ffa_direct_msg(struct arm_smccc_1_2_regs *res, + struct kvm_cpu_context *ctxt, + u64 vm_handle) +{ + DECLARE_REG(u32, flags, ctxt, 2); + + struct arm_smccc_1_2_regs *args =3D (void *)&ctxt->regs.regs[0]; + + /* filter out framework messages */ + if (FIELD_GET(FFA_MSG_FLAGS_MSG_TYPE, flags)) { + ffa_to_smccc_error(res, FFA_RET_INVALID_PARAMETERS); + return; + } + + 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; @@ -920,6 +937,11 @@ 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; } =20 if (ffa_call_supported(func_id)) diff --git a/include/linux/arm_ffa.h b/include/linux/arm_ffa.h index 81e603839c4a51873090b7e22edbe7b33a7e94df..d209d0cdac1eb804be01e4607ac= ac8f76cc99e40 100644 --- a/include/linux/arm_ffa.h +++ b/include/linux/arm_ffa.h @@ -130,6 +130,9 @@ #define FFA_FEAT_RXTX_MIN_SZ_16K 2 #define FFA_FEAT_RXTX_MIN_SZ_MASK GENMASK(1, 0) =20 +/* FFA message flags */ +#define FFA_MSG_FLAGS_MSG_TYPE BIT(31) + /* FFA Bus/Device/Driver related */ struct ffa_device { u32 id; --=20 2.52.0.rc1.455.g30608eb744-goog From nobody Tue Dec 2 02:32:11 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CF29026ED28; 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charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251119-host-direct-messages-v3-2-c74d04944b26@google.com> References: <20251119-host-direct-messages-v3-0-c74d04944b26@google.com> In-Reply-To: <20251119-host-direct-messages-v3-0-c74d04944b26@google.com> To: Marc Zyngier , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Yeoreum Yun , Ben Horgan , Oliver Upton Cc: Armelle Laine , Sebastien Ene , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, Per Larsen X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1763518092; l=2628; i=perlarsen@google.com; s=20250508; h=from:subject:message-id; bh=0P7CauTG9R1nzKRFKD32UxjLLHMH6ZtNvg/BjDofeXQ=; b=EZG9yPi4huWCccQXEesR1wCdc/CnJUYSPaK4VunD6mhrLHI12t9bObg45GcwkKX0FO/4oX1Mq QlNJtRd1F5PC/yNtMbD3eBg1eF+aMS2tMTrUiEUIgHzI/EqYBGSppqi X-Developer-Key: i=perlarsen@google.com; a=ed25519; pk=jjc/Ta4VmrLRmMoahP6d1mBcKzvWU+nsmdtYe2oS2kQ= X-Endpoint-Received: by B4 Relay for perlarsen@google.com/20250508 with auth_id=402 X-Original-From: Per Larsen Reply-To: perlarsen@google.com From: Per Larsen FF-A 1.2 adds the DIRECT_REQ2 messaging interface which is similar to the existing FFA_MSG_SEND_DIRECT_{REQ,RESP} functions and can use the existing handler function. Add support for FFA_MSG_SEND_DIRECT_REQ2 in the host ffa handler. Reviewed-by: Yeoreum Yun Signed-off-by: Per Larsen --- arch/arm64/kvm/hyp/nvhe/ffa.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c index a38a3ab497e5eac11777109684a33f02d88d09a1..c794802bda589b315faf978086a= d164a2aee510a 100644 --- a/arch/arm64/kvm/hyp/nvhe/ffa.c +++ b/arch/arm64/kvm/hyp/nvhe/ffa.c @@ -683,8 +683,10 @@ static bool ffa_call_supported(u64 func_id) case FFA_NOTIFICATION_SET: case FFA_NOTIFICATION_GET: case FFA_NOTIFICATION_INFO_GET: + return false; /* Optional interfaces added in FF-A 1.2 */ case FFA_MSG_SEND_DIRECT_REQ2: /* Optional per 7.5.1 */ + return hyp_ffa_version >=3D FFA_VERSION_1_2; case FFA_MSG_SEND_DIRECT_RESP2: /* Optional per 7.5.1 */ case FFA_CONSOLE_LOG: /* Optional per 13.1: not in Table 13.1 */ case FFA_PARTITION_INFO_GET_REGS: /* Optional for virtual instances per 1= 3.1 */ @@ -866,12 +868,16 @@ static void do_ffa_direct_msg(struct arm_smccc_1_2_re= gs *res, struct kvm_cpu_context *ctxt, u64 vm_handle) { + DECLARE_REG(u64, func_id, ctxt, 0); DECLARE_REG(u32, flags, ctxt, 2); =20 struct arm_smccc_1_2_regs *args =3D (void *)&ctxt->regs.regs[0]; =20 - /* filter out framework messages */ - if (FIELD_GET(FFA_MSG_FLAGS_MSG_TYPE, flags)) { + /* + * filter out framework messages. + * FFA_MSG_SEND_DIRECT_REQ2 is only for partition messages. + */ + if (func_id !=3D FFA_MSG_SEND_DIRECT_REQ2 && FIELD_GET(FFA_MSG_FLAGS_MSG_= TYPE, flags)) { ffa_to_smccc_error(res, FFA_RET_INVALID_PARAMETERS); return; } @@ -937,6 +943,10 @@ 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_REQ2: + if (!ffa_call_supported(func_id)) + goto out_not_supported; + fallthrough; case FFA_MSG_SEND_DIRECT_REQ: case FFA_FN64_MSG_SEND_DIRECT_REQ: =20 @@ -947,6 +957,7 @@ bool kvm_host_ffa_handler(struct kvm_cpu_context *host_= ctxt, u32 func_id) if (ffa_call_supported(func_id)) return false; /* Pass through */ =20 +out_not_supported: ffa_to_smccc_error(&res, FFA_RET_NOT_SUPPORTED); out_handled: ffa_set_retval(host_ctxt, &res); --=20 2.52.0.rc1.455.g30608eb744-goog