From nobody Sun Feb 8 12:57:53 2026 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 682DD341AA0; Fri, 9 Jan 2026 22:34:34 +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=1767998074; cv=none; b=tvtFYcp8uIey0i+IhgvevcsdAXw7b/2doqubvPWzigXX1EZz0dIm1bwv/0fOWFTvoKBOn+Th7QlUEkn7VixwDRRKJsKNM+4YP+SVjO/RGOciPiQEsKZJkGvb9TBA67ed9AysD6xg4Zb3L2YBcCwEh649XzTrYp0JNSxMv1JCJ/c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767998074; c=relaxed/simple; bh=tIvspsneeLwDiomVsTRPwrdHkeMhFvZLlssLRaJyK48=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=NB31kHU+oRxx/+mtOi8/wdLQQRs6pOiau1554BOo49wRbPFp9QqFX+4Z7zW9mro4QPz3kc5S3FudqMyBWc5Nw04OnyODpHmXHL9LoY3jXSJvM2mZaNuPt7QXf/X08yxpNKhEuGh+e6JFMEWujbL3vY6admEtin8DbJVXy/Yw6Ik= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hr5ggYBY; 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="hr5ggYBY" Received: by smtp.kernel.org (Postfix) with ESMTPS id 44B71C19421; Fri, 9 Jan 2026 22:34:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767998073; bh=tIvspsneeLwDiomVsTRPwrdHkeMhFvZLlssLRaJyK48=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=hr5ggYBYoKwuQWxE28Z+24Z/FACu7sWJaF+asG1cvCWnJD7oorLB1Aaoh0QsJP0+8 D0QLgp4XXYSpxPzyNc/VTxe0qKZal/TdVMMyj+ugY9VeoMcEhSbJ/oDSHGa7ThflEt t0Dplam8RmmaaEPR2Hp5mQueJ7J8KamGJuu0jU8T0lZ0aSJQVIssjrY8Eh7dd5f0Qn bPzscz0+uNEHLFvpksuxLyGhydughg/SvNJ/1iLAFMRvRUhoxCsDGVb7XKsp5FQoaI E28i1/gZ7G1+Qzk+A7gUevKuK2yQBdk6gPjtAcbAaY4oAcwAAVyvHZHGLy1lyA9l9I lKFgwumGCUf2w== 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 350CCD277C1; Fri, 9 Jan 2026 22:34:33 +0000 (UTC) From: Per Larsen via B4 Relay Date: Fri, 09 Jan 2026 22:34:25 +0000 Subject: [PATCH v4 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: <20260109-host-direct-messages-v4-1-95da4221d186@google.com> References: <20260109-host-direct-messages-v4-0-95da4221d186@google.com> In-Reply-To: <20260109-host-direct-messages-v4-0-95da4221d186@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=1767998072; l=2212; i=perlarsen@google.com; s=20250508; h=from:subject:message-id; bh=w/i2Ml6dE6jz3JLbRWYLcU7BlfS1xCbyKvHbkV2MRRA=; b=xYmKBs65rSUnbTXmKTCxgMWon/4X3RUxdPsG8Cj2usbIGZu9UjyDqahHlTM25wI9lFyU8ezGk Fra7TJtjhoHCo/5jmgFb0vOVgISe6ixXpeX4H3s8r+Y3SFWE/Xfx9yn 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 | 20 ++++++++++++++++++++ include/linux/arm_ffa.h | 3 +++ 2 files changed, 23 insertions(+) diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c index f731cc4c3f280a32acccca0de92b9ac6c8e05602..fc84595007f310004def7d52537= 1fa7c128f244a 100644 --- a/arch/arm64/kvm/hyp/nvhe/ffa.c +++ b/arch/arm64/kvm/hyp/nvhe/ffa.c @@ -862,6 +862,22 @@ 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) +{ + DECLARE_REG(u32, flags, ctxt, 2); + + struct arm_smccc_1_2_regs *args =3D (void *)&ctxt->regs.regs[0]; + + /* filter out framework messages and validate SBZ/MBZ bits */ + if (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 +936,10 @@ 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); + 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 2.52.0.457.g6b5491de43-goog From nobody Sun Feb 8 12:57:53 2026 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 6825334028F; 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charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260109-host-direct-messages-v4-2-95da4221d186@google.com> References: <20260109-host-direct-messages-v4-0-95da4221d186@google.com> In-Reply-To: <20260109-host-direct-messages-v4-0-95da4221d186@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=1767998072; l=2798; i=perlarsen@google.com; s=20250508; h=from:subject:message-id; bh=c3MrS/34znRranLZm10PrMUtpmE475TkuovXAS+5+MI=; b=qHkWu9EqF449Np1H2JAAHz8j+iE6gWLv7K5AeT7Nqhvh/p51nPW33PIWKuoOcTnK5KZwDHIEs JjBQG9RB8ywAGeU0DJkuPlT/wbrmuBR/4PtIVvslGM87mDE/w4w/B3w 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 | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c index fc84595007f310004def7d525371fa7c128f244a..bc4a6ee8f9c815d93e53024653f= 23a8c903a1b88 100644 --- a/arch/arm64/kvm/hyp/nvhe/ffa.c +++ b/arch/arm64/kvm/hyp/nvhe/ffa.c @@ -684,11 +684,12 @@ static bool ffa_call_supported(u64 func_id) case FFA_NOTIFICATION_GET: case FFA_NOTIFICATION_INFO_GET: /* Optional interfaces added in FF-A 1.2 */ - case FFA_MSG_SEND_DIRECT_REQ2: /* Optional per 7.5.1 */ 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 */ return false; + case FFA_MSG_SEND_DIRECT_REQ2: /* Optional per 7.5.1 */ + return hyp_ffa_version >=3D FFA_VERSION_1_2; } =20 return true; @@ -865,12 +866,17 @@ static void do_ffa_part_get(struct arm_smccc_1_2_regs= *res, static void do_ffa_direct_msg(struct arm_smccc_1_2_regs *res, struct kvm_cpu_context *ctxt) { + 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 and validate SBZ/MBZ bits */ - if (flags) { + /* + * filter out framework messages and validate SBZ/MBZ flag bits. + * FFA_MSG_SEND_DIRECT_REQ2 implies flag-less partition message. + */ + if ((func_id =3D=3D FFA_MSG_SEND_DIRECT_REQ || + func_id =3D=3D FFA_FN64_MSG_SEND_DIRECT_REQ) && flags) { ffa_to_smccc_error(res, FFA_RET_INVALID_PARAMETERS); return; } @@ -936,6 +942,10 @@ 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: do_ffa_direct_msg(&res, host_ctxt); @@ -945,6 +955,7 @@ 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 2.52.0.457.g6b5491de43-goog