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 11256F8DFFF for ; Fri, 17 Apr 2026 17:58:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=pBnecfj7pDlfSrC2G8Wk+XN5melsXUI3v8mt7Sj6n3g=; b=TqWAF8alG5vJIApQ3WxBv11gBx ZXO9DpCIOzFwVjZb8Ehuv4trKrGh2qHOYzKA+JkLgM3C9wAzDZClKBAMDgTPk7H8pjVKj6PpDAdK7 UF1GKpwccF8I6513IwJ2H//0rvbhzV4f8pcUOlabVxZpmvRJ77j48YvKF2b2A/KHDR7jvSU5wbq2P BIFVZEvWf5hNVocIm/0Fx1uYCZVGWwA55izPlPxqBSmXAc2uTeyzk3AF7ADNcwF0oVrvJuWW7hpUm rzHItOMUw4WtuunN+P+QrmdrmjrLl7Ld4IQ6wXXQGCHHHokO/v9bK6o/bhyr05wJ9AWGb/7GgjPiE QxJ1Quww==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wDnSR-00000004LT6-2Nmp; Fri, 17 Apr 2026 17:58:23 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wDnSO-00000004LRI-2KiX for linux-arm-kernel@lists.infradead.org; Fri, 17 Apr 2026 17:58:21 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 7B1CE1D70; Fri, 17 Apr 2026 10:58:13 -0700 (PDT) Received: from e129823.cambridge.arm.com (e129823.arm.com [10.1.197.6]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id CAEDA3F7D8; Fri, 17 Apr 2026 10:58:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1776448699; bh=e3o4nX2FYzFLs1uAJiYhcCfAbWsy9IaHHY4Cf/NSGlU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PAQgiHJflKchkVTf/kQxxIrjzTHGvFJkuV2kwY6XVZZlvHYUbI3Avkufy0FHECdDg 0P+g9FWmwfm3CDwAafNIVAFd5MRZvLs98syRr3ZCobKtO8PfJc1iP/boxHqZ8imHPw eybNPYc6+cBCnjNgTj1nJ8zU6CpETaF8idHpaOrA= From: Yeoreum Yun To: linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, linux-integrity@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev Cc: paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, zohar@linux.ibm.com, roberto.sassu@huawei.com, dmitry.kasatkin@gmail.com, eric.snowberg@oracle.com, peterhuewe@gmx.de, jarkko@kernel.org, jgg@ziepe.ca, sudeep.holla@kernel.org, maz@kernel.org, oupton@kernel.org, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org, Yeoreum Yun Subject: [RFC PATCH 4/4] firmware: arm_ffa: check pkvm initailised when initailise ffa driver Date: Fri, 17 Apr 2026 18:57:59 +0100 Message-Id: <20260417175759.3191279-5-yeoreum.yun@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260417175759.3191279-1-yeoreum.yun@arm.com> References: <20260417175759.3191279-1-yeoreum.yun@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260417_105820_647067_DFF1B136 X-CRM114-Status: GOOD ( 11.51 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org When pKVM is enabled, the FF-A driver must be initialized after pKVM. Otherwise, pKVM cannot negotiate the FF-A version or obtain RX/TX buffer information, leading to failures in FF-A calls. During FF-A driver initialization, check whether pKVM has been initialized. If not, defer probing of the FF-A driver. Signed-off-by: Yeoreum Yun --- arch/arm64/kvm/arm.c | 1 + drivers/firmware/arm_ffa/driver.c | 12 ++++++++++++ 2 files changed, 13 insertions(+) diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 410ffd41fd73..0f517b1c05cd 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -119,6 +119,7 @@ bool is_kvm_arm_initialised(void) { return kvm_arm_initialised; } +EXPORT_SYMBOL(is_kvm_arm_initialised); int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) { diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c index 02c76ac1570b..2647d6554afd 100644 --- a/drivers/firmware/arm_ffa/driver.c +++ b/drivers/firmware/arm_ffa/driver.c @@ -42,6 +42,8 @@ #include #include +#include + #include "common.h" #define FFA_DRIVER_VERSION FFA_VERSION_1_2 @@ -2035,6 +2037,16 @@ static int __init ffa_init(void) u32 buf_sz; size_t rxtx_bufsz = SZ_4K; + /* + * When pKVM is enabled, the FF-A driver must be initialized + * after pKVM initialization. Otherwise, pKVM cannot negotiate + * the FF-A version or obtain RX/TX buffer information, + * which leads to failures in FF-A calls. + */ + if (IS_ENABLED(CONFIG_KVM) && is_protected_kvm_enabled() && + !is_kvm_arm_initialised()) + return -EPROBE_DEFER; + ret = ffa_transport_init(&invoke_ffa_fn); if (ret) return ret; -- LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}