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 X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7CC64C07E99 for ; Mon, 5 Jul 2021 08:28:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6582C613F1 for ; Mon, 5 Jul 2021 08:28:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230412AbhGEIav (ORCPT ); Mon, 5 Jul 2021 04:30:51 -0400 Received: from 8bytes.org ([81.169.241.247]:59008 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230172AbhGEI26 (ORCPT ); Mon, 5 Jul 2021 04:28:58 -0400 Received: from cap.home.8bytes.org (p5b006775.dip0.t-ipconnect.de [91.0.103.117]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by theia.8bytes.org (Postfix) with ESMTPSA id D03EBAA3; Mon, 5 Jul 2021 10:26:18 +0200 (CEST) From: Joerg Roedel To: x86@kernel.org Cc: Joerg Roedel , Joerg Roedel , hpa@zytor.com, Andy Lutomirski , Dave Hansen , Peter Zijlstra , Jiri Slaby , Dan Williams , Tom Lendacky , Juergen Gross , Kees Cook , David Rientjes , Cfir Cohen , Erdem Aktas , Masami Hiramatsu , Mike Stunes , Sean Christopherson , Martin Radev , Arvind Sankar , linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org Subject: [RFC PATCH 11/12] x86/sev: Handle CLFLUSH MMIO events Date: Mon, 5 Jul 2021 10:24:42 +0200 Message-Id: <20210705082443.14721-12-joro@8bytes.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210705082443.14721-1-joro@8bytes.org> References: <20210705082443.14721-1-joro@8bytes.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Joerg Roedel Handle CLFLUSH instruction to MMIO memory in the #VC handler. The instruction is ignored by the handler, as the Hypervisor is responsible for cache management of emulated MMIO memory. Signed-off-by: Joerg Roedel --- arch/x86/kernel/sev-shared.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c index a7a0793c4f98..682fa202444f 100644 --- a/arch/x86/kernel/sev-shared.c +++ b/arch/x86/kernel/sev-shared.c @@ -632,6 +632,15 @@ static enum es_result vc_handle_mmio_twobyte_ops(struct ghcb *ghcb, long *reg_data; switch (insn->opcode.bytes[1]) { + /* CLFLUSH */ + case 0xae: + /* + * Ignore CLFLUSHes - those go to emulated MMIO anyway and the + * hypervisor is responsible for cache management. + */ + ret = ES_OK; + break; + /* MMIO Read w/ zero-extension */ case 0xb6: bytes = 1; -- 2.31.1