From patchwork Wed Feb 10 10:21:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joerg Roedel X-Patchwork-Id: 12080461 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,URIBL_BLOCKED,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 82B74C433DB for ; Wed, 10 Feb 2021 10:25:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 365AA64E30 for ; Wed, 10 Feb 2021 10:25:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229960AbhBJKZS (ORCPT ); Wed, 10 Feb 2021 05:25:18 -0500 Received: from 8bytes.org ([81.169.241.247]:55276 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230508AbhBJKWm (ORCPT ); Wed, 10 Feb 2021 05:22:42 -0500 Received: from cap.home.8bytes.org (p549adcf6.dip0.t-ipconnect.de [84.154.220.246]) (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 B66804B5; Wed, 10 Feb 2021 11:21:58 +0100 (CET) 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-kernel@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org Subject: [PATCH 7/7] x86/sev-es: Replace open-coded hlt-loops with sev_es_terminate() Date: Wed, 10 Feb 2021 11:21:35 +0100 Message-Id: <20210210102135.30667-8-joro@8bytes.org> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210210102135.30667-1-joro@8bytes.org> References: <20210210102135.30667-1-joro@8bytes.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Joerg Roedel There are a few places left in the SEV-ES C code where hlt loops and/or terminate requests are implemented. Replace them all with calls to sev_es_terminate(). Signed-off-by: Joerg Roedel --- arch/x86/boot/compressed/sev-es.c | 12 +++--------- arch/x86/kernel/sev-es-shared.c | 10 +++------- 2 files changed, 6 insertions(+), 16 deletions(-) diff --git a/arch/x86/boot/compressed/sev-es.c b/arch/x86/boot/compressed/sev-es.c index 27826c265aab..d904bd56b3e3 100644 --- a/arch/x86/boot/compressed/sev-es.c +++ b/arch/x86/boot/compressed/sev-es.c @@ -200,14 +200,8 @@ void do_boot_stage2_vc(struct pt_regs *regs, unsigned long exit_code) } finish: - if (result == ES_OK) { + if (result == ES_OK) vc_finish_insn(&ctxt); - } else if (result != ES_RETRY) { - /* - * For now, just halt the machine. That makes debugging easier, - * later we just call sev_es_terminate() here. - */ - while (true) - asm volatile("hlt\n"); - } + else if (result != ES_RETRY) + sev_es_terminate(GHCB_SEV_ES_REASON_GENERAL_REQUEST); } diff --git a/arch/x86/kernel/sev-es-shared.c b/arch/x86/kernel/sev-es-shared.c index cdc04d091242..7c34be61258e 100644 --- a/arch/x86/kernel/sev-es-shared.c +++ b/arch/x86/kernel/sev-es-shared.c @@ -24,7 +24,7 @@ static bool __init sev_es_check_cpu_features(void) return true; } -static void sev_es_terminate(unsigned int reason) +static void __noreturn sev_es_terminate(unsigned int reason) { u64 val = GHCB_SEV_TERMINATE; @@ -210,12 +210,8 @@ void __init do_vc_no_ghcb(struct pt_regs *regs, unsigned long exit_code) return; fail: - sev_es_wr_ghcb_msr(GHCB_SEV_TERMINATE); - VMGEXIT(); - - /* Shouldn't get here - if we do halt the machine */ - while (true) - asm volatile("hlt\n"); + /* Terminate the guest */ + sev_es_terminate(GHCB_SEV_ES_REASON_GENERAL_REQUEST); } static enum es_result vc_insn_string_read(struct es_em_ctxt *ctxt,