From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 84A0E34EF0D; Fri, 17 Apr 2026 17:58:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776448700; cv=none; b=pumm5ikdIyPrcOeS4xBvdvLC9tSGg8qTb2RMyLQaj0avpFcZiylHQsL/qnuvfJCRxaqhOyRXw6dVXFxjTqcIz2Zsmdh194anZPbkrC/DNy35YzY5B3Ap8qRwTmplMw/hrTIgBNKzdwC56IBuwNUM5dQcVPLJkhKDbozus97xOmk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776448700; c=relaxed/simple; bh=e3o4nX2FYzFLs1uAJiYhcCfAbWsy9IaHHY4Cf/NSGlU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=NmvnItbM++KSIsmCpSYqKoSmKfKBDs6vcpBmieh1ldLqTMG/7dj5J+Zd7jQ7DXTWZJy4TdibId+j/HQCki6O4dbGOahDZw4UhoA1ItM2IcVdgaeASpLsOI4bQVxyrVi236vOn3AOHj99+8O/pQXoDPlYK+Mu0zkwaOIkE1IqyxE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=PAQgiHJf; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="PAQgiHJf" 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> Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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}