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 02103C3DA78 for ; Fri, 13 Jan 2023 17:37:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=bX9YaVwgnFzqa8L+SiTQO758VVpTHEs8vKRqjfFqKpw=; b=ZpMqzqHvaL768F nHaMLC6hNZYicg+etIaLcIE7AJgbsH0g4+lIGLvF+XtAnSZxP3wLqvTSAGdrlrZs5K6UnLRPvA5t1 ABMieQVujX3d9WKv+dPD0GwyPFh9kq4/IUOug4upMKhMdZWJ18uaM7Dv/ZhjPZXfs9/FoR/okwe7d CXBi+7BbfkDH0I2W6wI6Phu5TK9I3gnFTmGvxCApXJbUyg6q2SuaH/NR2FjPFpannifhQyKfPmAeC XvOdsdFWka97R980H9VwRVwL+SbG7xkKaKvITsy5wAk7qhqLIN+PNB76Pe5MRcbUonx2gVg0eqmaz DMxA0m8LQKNhmEEfE1Aw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pGNyl-003oUq-E3; Fri, 13 Jan 2023 17:36:36 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1pGNo6-003iyJ-3w for linux-arm-kernel@lists.infradead.org; Fri, 13 Jan 2023 17:25:37 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 0E829622C4; Fri, 13 Jan 2023 17:25:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6BDDBC433F0; Fri, 13 Jan 2023 17:25:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1673630732; bh=GLsGai/HaLX4rlQF1y+E+eiiJYqVXPvgiCUVO/iODC0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TzmhEF9Dtrwr2Wgs5zPIv+FcdFKirg2OCG3DDBEaTWvW2XahQnc+0Pg2UdVutjuXi gkt3xDri07c7khkZhvWeffUeVVZDBeeoYE4Y3aU7LwyfLqmU8ZWF/97aBu7ba6aAqD c94Q2HJwLlgQK+ODsDJUxRmG1XpfNTPZKfkNi+qDyqOKx9ChlCKQOSQAeEiCND1gIK /iavORKQo9MRf/9KPHbeFsXyEu5FzlrQj4ZRyVy/zu+AtLz4FZQtk7Ca0T039mIBoN 0ddl4fwkl4Qi6vjae5aENV4EswKkt70pWz7zVYeAomg9OhbIrCFUfUasdN22OeHhhg 3t0ioO51D15hQ== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1pGNo2-001bBu-Do; Fri, 13 Jan 2023 17:25:30 +0000 From: Marc Zyngier To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org Cc: Will Deacon , Catalin Marinas , Mark Rutland , James Morse , Suzuki K Poulose , Oliver Upton , Zenghui Yu Subject: [PATCH 1/2] KVM: arm64: Disable KVM on systems with a VPIPT i-cache Date: Fri, 13 Jan 2023 17:25:22 +0000 Message-Id: <20230113172523.2063867-2-maz@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230113172523.2063867-1-maz@kernel.org> References: <20230113172523.2063867-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, will@kernel.org, catalin.marinas@arm.com, mark.rutland@arm.com, james.morse@arm.com, suzuki.poulose@arm.com, oliver.upton@linux.dev, yuzenghui@huawei.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230113_092534_235842_ED2974ED X-CRM114-Status: GOOD ( 13.10 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Systems with a VMID-tagged PIPT i-cache have been supported for a while by Linux and KVM. However, these systems never appeared on our side of the multiverse. Refuse to initialise KVM on such a machine, should then ever appear. Following changes will drop the support from the hypervisor. Signed-off-by: Marc Zyngier --- arch/arm64/kvm/arm.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 9c5573bc4614..508deed213a2 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -2195,6 +2195,11 @@ int kvm_arch_init(void *opaque) int err; bool in_hyp_mode; + if (icache_is_vpipt()) { + kvm_info("Incompatible VPIPT I-Cache policy\n"); + return -ENODEV; + } + if (!is_hyp_mode_available()) { kvm_info("HYP mode not available\n"); return -ENODEV; -- 2.34.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel