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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1FF1CC3DA78 for ; Fri, 13 Jan 2023 17:38:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230038AbjAMRiJ (ORCPT ); Fri, 13 Jan 2023 12:38:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50728 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229748AbjAMRhn (ORCPT ); Fri, 13 Jan 2023 12:37:43 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B289A857F7 for ; Fri, 13 Jan 2023 09:25:44 -0800 (PST) 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 ams.source.kernel.org (Postfix) with ESMTPS id E764CB8219B for ; 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 Content-Transfer-Encoding: 8bit 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 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.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