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,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 94723C433ED for ; Fri, 2 Apr 2021 15:27:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 66CB16113E for ; Fri, 2 Apr 2021 15:27:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236416AbhDBP1S (ORCPT ); Fri, 2 Apr 2021 11:27:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58534 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235902AbhDBP1D (ORCPT ); Fri, 2 Apr 2021 11:27:03 -0400 Received: from mail-lf1-x12a.google.com (mail-lf1-x12a.google.com [IPv6:2a00:1450:4864:20::12a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 09E91C0613A5 for ; Fri, 2 Apr 2021 08:27:02 -0700 (PDT) Received: by mail-lf1-x12a.google.com with SMTP id v15so8064806lfq.5 for ; Fri, 02 Apr 2021 08:27:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=shutemov-name.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=NRukntRqIH9oIHyEudEHW0ud1MS+kv1ItAvshsRDqdY=; b=OpnsWKAM4VA/3UajjTCQJv0IEmv/0iPE0cJ2j+RQr1BHXgXYYceO6wtUvATOrb8yhE ROIE0NF0cuH3XzqzsGoFP1JH5Z9yBF0PahBLj0EICTqrjAVYZO4E2fXsJt2FgeUg/8U9 ZRGRbz90+MPk3bQ4bB+VUAa43wHu4myuLLxb01b9PPkMBQm771dpsGaPFoITfHu7WFsv iM0kGJIR3O5KSYl9ajKvDg7zS0KcRszn2eh6ZuRc4lo67X7SLMiHDVAUTOAF6p4iwgt+ WdofJyWwhCixbMTTAehF+H2czWQ42ICOYt0u0Kz7T8yHx9byTn7DeA7quwp3YYB0vhrh bE7A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=NRukntRqIH9oIHyEudEHW0ud1MS+kv1ItAvshsRDqdY=; b=jCFBthmqsoy48q1xGaHxGbfE5R59XjKpiTe5A1P41nEsGnXU0hGQL5xe8vmaWa/J7j c1RVJfUWNzY0au6xXQhD8rPCozZuRLWEFw6pMpBiusJ8HIt+VQuLcjGVcNzQekAPJ4rr IwUpr2d2SZJmFDwjXJo04kUwTz84rSjavEknE8H5cfVpoKROxA3PRoCOMefP8/PBXPA6 itdf0K7AT/lqQafgDRzFdVUTO85kFWu5ZQmP4Yhl2a9oQE0MoKoWTQLMmSLtyTFXAWUO 081sPFVWHKfm2ake5FvObrSJtFLWwrh4vcFIrixymLl5hl7OBbLN0EHfUAprdWzqpwyR rm3Q== X-Gm-Message-State: AOAM5319D+aTCiaIJy/bcMo9nAfA3e6ipNDz0U0/T6FbB4PsPqrX0On4 ijyOJZqfj5bEXs2+sQNHMdTKnQ== X-Google-Smtp-Source: ABdhPJw++Ib9aIsPBwn/2Eq095u9hzk548gclpFwNAHjmRz4tdPGJM905f0xXlmoFAawzYOuJioEtg== X-Received: by 2002:a19:b49:: with SMTP id 70mr9524337lfl.342.1617377220450; Fri, 02 Apr 2021 08:27:00 -0700 (PDT) Received: from box.localdomain ([86.57.175.117]) by smtp.gmail.com with ESMTPSA id w23sm953636lji.127.2021.04.02.08.26.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Apr 2021 08:26:59 -0700 (PDT) From: "Kirill A. Shutemov" X-Google-Original-From: "Kirill A. Shutemov" Received: by box.localdomain (Postfix, from userid 1000) id 4E65C102678; Fri, 2 Apr 2021 18:26:59 +0300 (+03) To: Dave Hansen , Andy Lutomirski , Peter Zijlstra , Sean Christopherson , Jim Mattson Cc: David Rientjes , "Edgecombe, Rick P" , "Kleen, Andi" , "Yamahata, Isaku" , x86@kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: [RFCv1 6/7] x86/realmode: Share trampoline area if KVM memory protection enabled Date: Fri, 2 Apr 2021 18:26:44 +0300 Message-Id: <20210402152645.26680-7-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.26.3 In-Reply-To: <20210402152645.26680-1-kirill.shutemov@linux.intel.com> References: <20210402152645.26680-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If KVM memory protection is active, the trampoline area will need to be in shared memory. Signed-off-by: Kirill A. Shutemov --- arch/x86/realmode/init.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c index 22fda7d99159..f3b54b5da693 100644 --- a/arch/x86/realmode/init.c +++ b/arch/x86/realmode/init.c @@ -10,6 +10,7 @@ #include #include #include +#include struct real_mode_header *real_mode_header; u32 *trampoline_cr4_features; @@ -75,11 +76,11 @@ static void __init setup_real_mode(void) base = (unsigned char *)real_mode_header; /* - * If SME is active, the trampoline area will need to be in - * decrypted memory in order to bring up other processors + * If SME or KVM memory protection is active, the trampoline area will + * need to be in decrypted memory in order to bring up other processors * successfully. This is not needed for SEV. */ - if (sme_active()) + if (sme_active() || kvm_mem_protected()) set_memory_decrypted((unsigned long)base, size >> PAGE_SHIFT); memcpy(base, real_mode_blob, size); -- 2.26.3