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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AB952C61DA7 for ; Fri, 27 Jan 2023 11:43:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233879AbjA0Lm5 (ORCPT ); Fri, 27 Jan 2023 06:42:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60010 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233925AbjA0LmB (ORCPT ); Fri, 27 Jan 2023 06:42:01 -0500 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id E13317A4A1; Fri, 27 Jan 2023 03:41:29 -0800 (PST) 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 B8BAC165C; Fri, 27 Jan 2023 03:41:50 -0800 (PST) Received: from ewhatever.cambridge.arm.com (ewhatever.cambridge.arm.com [10.1.197.1]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 329813F64C; Fri, 27 Jan 2023 03:41:06 -0800 (PST) From: Suzuki K Poulose To: kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: suzuki.poulose@arm.com, Alexandru Elisei , Andrew Jones , Christoffer Dall , Fuad Tabba , Jean-Philippe Brucker , Joey Gouly , Marc Zyngier , Mark Rutland , Oliver Upton , Paolo Bonzini , Quentin Perret , Steven Price , Thomas Huth , Will Deacon , Zenghui Yu , linux-coco@lists.linux.dev, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [RFC kvmtool 28/31] arm64: realm: Enforce virtio F_ACCESS_PLATFORM flag Date: Fri, 27 Jan 2023 11:39:29 +0000 Message-Id: <20230127113932.166089-29-suzuki.poulose@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230127113932.166089-1-suzuki.poulose@arm.com> References: <20230127112248.136810-1-suzuki.poulose@arm.com> <20230127113932.166089-1-suzuki.poulose@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org For realms, force the F_ACCESS_PLATFORM flag to ensure DMA-APIs are triggered for virtio in Linux Signed-off-by: Suzuki K Poulose --- arm/aarch64/kvm.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arm/aarch64/kvm.c b/arm/aarch64/kvm.c index a4664237..1f3a0def 100644 --- a/arm/aarch64/kvm.c +++ b/arm/aarch64/kvm.c @@ -5,6 +5,7 @@ #include #include #include +#include #include @@ -237,5 +238,10 @@ void kvm__arch_enable_mte(struct kvm *kvm) u64 kvm__arch_get_virtio_host_features(struct kvm *kvm) { - return 0; + u64 features = 0; + + /* Enforce F_ACCESS_PLATFORM for Realms */ + if (kvm->cfg.arch.is_realm) + features |= (1ULL << VIRTIO_F_ACCESS_PLATFORM); + return features; } -- 2.34.1