From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 26B25FF885A for ; Fri, 1 May 2026 05:34:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Reply-To:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To: References:Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version: Subject:Date:From:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=D1pAvU48Dc4lDVPNYbZzsmuQ/LmzckNR9wTwxT/MlDE=; b=duPlRmxNGsZU99TKB4DbY9Ej5m 4KMdvg+VFo+cM1EbQ5U9f4xbgaDAmfFf9alTp1DtuMlfH9xQytmLJJG/zuPTXFnAjR2rFaO1OTyed 5h0FxDDQw90IJaVQw3CP43/XxKCV3hCxuYh1HE6Z7SyOu7Jo9pinC/RA92ov29lOdvO3ptlgtqjD3 bJoYGz8+6vkQ0RSD4IIEQrBQaIGXlUxY3kLFIm9Lo8UjWNqLtOVO1MZ9f64/xclkLwqV2oOt9iEs6 /zlHRW2VH2i+zgni9oXo8D0Y3PA9dq9mOD617zU7C0cWb6MgUsPrWeVlYC2Y6jRjhPNDpE2sA7kCo OROxV/ZA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wIgWT-00000006Nm7-19Iz; Fri, 01 May 2026 05:34:45 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1wIgWR-00000006Nla-32jb for linux-arm-kernel@lists.infradead.org; Fri, 01 May 2026 05:34:43 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id BE14A6057A; Fri, 1 May 2026 05:34:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPS id 67598C2BCC6; Fri, 1 May 2026 05:34:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777613682; bh=aRn8GJuxqyfjg3v+/hvhpxZjcAkxiTVxbeiVJTql2IE=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=rJ85hmf6L50HybXisMXQK7XpgSX6irq+jKqgcRDWEteFah7WPA6A3O3RrFM+2BlXx F0gBbwGPdHD09rm9+XgbouslhnbVYoy04bqEZYObgdmxB1zo3kPD/NARAIb2ONbjc3 lr7NXAjtNfGvt50yt6sUnj+E++Hs/NHx8nqKzXxtxhpWPOoRHKk+NKxlBbML/Q1FdS OXwjBtLXTUnXHA+zpXTpeDKxJLW3UkVUqqNXfmFqyF+d4BqPq2n0uXcuh/7tBW5BpI PF+H/U6XonZ3187SnnyEp9wHMHlxFjEa/gb2ySQjJIEHLvrkhd1ydMamUW1Ig++HTD UHZ8UitEn+/qg== 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 5D9AEFF885A; Fri, 1 May 2026 05:34:42 +0000 (UTC) From: Per Larsen via B4 Relay Date: Fri, 01 May 2026 05:34:32 +0000 Subject: [PATCH v6 1/2] KVM: arm64: Support FFA_MSG_SEND_DIRECT_REQ in host handler MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260501-host-direct-messages-v6-1-3f4af727ed85@google.com> References: <20260501-host-direct-messages-v6-0-3f4af727ed85@google.com> In-Reply-To: <20260501-host-direct-messages-v6-0-3f4af727ed85@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 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1777613681; l=2423; i=perlarsen@google.com; s=20250508; h=from:subject:message-id; bh=WcT4GnYGRai1al3No1p4rWhaOhcYyVBgrnZcY70Vuxw=; b=0m4u+K26HoB3/Z/4qCMDxYHu0SFv3ZicVI1ZZvzDrdc4U6qjzmtKHKEX4NRiWkvTVZBS/g88V 87W2na3RsfHCYCbaHpCtIhSiIGRFqlijuRRMdXJR0zUkjv9ZPuQMM4r 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 X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: perlarsen@google.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 | 26 ++++++++++++++++++++++++++ include/linux/arm_ffa.h | 2 ++ 2 files changed, 28 insertions(+) diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c index 1af722771178..3a58e01d255f 100644 --- a/arch/arm64/kvm/hyp/nvhe/ffa.c +++ b/arch/arm64/kvm/hyp/nvhe/ffa.c @@ -862,6 +862,28 @@ 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) +{ + DECLARE_REG(u32, endp, ctxt, 1); + DECLARE_REG(u32, flags, ctxt, 2); + + struct arm_smccc_1_2_regs *args = (void *)&ctxt->regs.regs[0]; + + if (FIELD_GET(FFA_SRC_ENDPOINT_MASK, endp) != HOST_FFA_ID) { + ffa_to_smccc_error(res, FFA_RET_INVALID_PARAMETERS); + return; + } + + /* 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 +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_REQ: + case FFA_FN64_MSG_SEND_DIRECT_REQ: + do_ffa_direct_msg(&res, host_ctxt); + goto out_handled; } if (ffa_call_supported(func_id)) diff --git a/include/linux/arm_ffa.h b/include/linux/arm_ffa.h index 81e603839c4a..f47d4bd51b2d 100644 --- a/include/linux/arm_ffa.h +++ b/include/linux/arm_ffa.h @@ -269,6 +269,8 @@ bool ffa_partition_check_property(struct ffa_device *dev, u32 property) (ffa_partition_check_property(dev, FFA_PARTITION_DIRECT_REQ2_RECV) && \ !dev->mode_32bit) +#define FFA_SRC_ENDPOINT_MASK GENMASK(31, 16) + /* For use with FFA_MSG_SEND_DIRECT_{REQ,RESP} which pass data via registers */ struct ffa_send_direct_data { unsigned long data0; /* w3/x3 */ -- 2.54.0.545.g6539524ca2-goog