From patchwork Wed May 12 14:51:34 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 436239 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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 372E7C43600 for ; Wed, 12 May 2021 17:06:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EEF4261363 for ; Wed, 12 May 2021 17:05:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238971AbhELRGN (ORCPT ); Wed, 12 May 2021 13:06:13 -0400 Received: from mail.kernel.org ([198.145.29.99]:42466 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242530AbhELQuZ (ORCPT ); Wed, 12 May 2021 12:50:25 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 76AF361E8F; Wed, 12 May 2021 16:16:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620836192; bh=zVo2qWTUfNmChk0Lfx8n9Al/jsit1Inq1Mfk6wA8Nw0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mMw3E4lZ/RpMdxqXwGInaUWIQTdSUVSG4f8oKcJXho8/ieVR8qpEHTjVyRgHM6Ki4 P4yGn0lfCcBXoKGOtYhtKdnRO+VHG5ER/nZoGtfaj48BlTeFXLOSLyycmtXEdQLfV1 k5TzUWAbsDtDvXt9/zxRL4HOmm/lJbWYnvdnyik8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tom Lendacky , Sean Christopherson , Paolo Bonzini , Sasha Levin Subject: [PATCH 5.12 648/677] KVM: SVM: Disable SEV/SEV-ES if NPT is disabled Date: Wed, 12 May 2021 16:51:34 +0200 Message-Id: <20210512144858.891777378@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210512144837.204217980@linuxfoundation.org> References: <20210512144837.204217980@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Sean Christopherson [ Upstream commit fa13680f5668cff05302a2f4753c49334a83a064 ] Disable SEV and SEV-ES if NPT is disabled. While the APM doesn't clearly state that NPT is mandatory, it's alluded to by: The guest page tables, managed by the guest, may mark data memory pages as either private or shared, thus allowing selected pages to be shared outside the guest. And practically speaking, shadow paging can't work since KVM can't read the guest's page tables. Fixes: e9df09428996 ("KVM: SVM: Add sev module_param") Cc: Brijesh Singh Signed-off-by: Sean Christopherson Message-Id: <20210422021125.3417167-4-seanjc@google.com> Signed-off-by: Paolo Bonzini Signed-off-by: Sasha Levin --- arch/x86/kvm/svm/svm.c | 30 +++++++++++++++--------------- 1 file changed, 15 insertions(+), 15 deletions(-) diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index d5620361eae7..309725151313 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -968,21 +968,6 @@ static __init int svm_hardware_setup(void) kvm_enable_efer_bits(EFER_SVME | EFER_LMSLE); } - if (IS_ENABLED(CONFIG_KVM_AMD_SEV) && sev) { - sev_hardware_setup(); - } else { - sev = false; - sev_es = false; - } - - svm_adjust_mmio_mask(); - - for_each_possible_cpu(cpu) { - r = svm_cpu_init(cpu); - if (r) - goto err; - } - /* * KVM's MMU doesn't support using 2-level paging for itself, and thus * NPT isn't supported if the host is using 2-level paging since host @@ -997,6 +982,21 @@ static __init int svm_hardware_setup(void) kvm_configure_mmu(npt_enabled, get_max_npt_level(), PG_LEVEL_1G); pr_info("kvm: Nested Paging %sabled\n", npt_enabled ? "en" : "dis"); + if (IS_ENABLED(CONFIG_KVM_AMD_SEV) && sev && npt_enabled) { + sev_hardware_setup(); + } else { + sev = false; + sev_es = false; + } + + svm_adjust_mmio_mask(); + + for_each_possible_cpu(cpu) { + r = svm_cpu_init(cpu); + if (r) + goto err; + } + if (nrips) { if (!boot_cpu_has(X86_FEATURE_NRIPS)) nrips = false;