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[2620:137:e000::1:20]) by mx.google.com with ESMTP id ne8-20020a1709077b8800b006e87643da69si10205487ejc.746.2022.05.08.07.00.48; Sun, 08 May 2022 07:01:13 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@shutemov-name.20210112.gappssmtp.com header.s=20210112 header.b=XDOiXFe3; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1442839AbiEFPcQ (ORCPT + 99 others); Fri, 6 May 2022 11:32:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52688 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1381187AbiEFPcN (ORCPT ); Fri, 6 May 2022 11:32:13 -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 D194C689AD for ; Fri, 6 May 2022 08:28:29 -0700 (PDT) Received: by mail-lf1-x12a.google.com with SMTP id p10so13164446lfa.12 for ; Fri, 06 May 2022 08:28:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=shutemov-name.20210112.gappssmtp.com; s=20210112; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=Zft6jLRsO2R4fi/u6eN2DfU9nqCVAT62ZsK14nFpt1E=; b=XDOiXFe386wjEOozpamYgEKo6bjtMbmjBf6MAneBln9fKLJlP6D2htacG8pzD1PGag BDq35Fa8Jpg8S9B46om+RPRvalMJRvhTP12mCthVw04+GIgsTZZ7yVjRl0C2uaZpdQHC 8OpoKg0LwaxmGb/ePwtsDwYTb3jaSpG+mwpzDih1r/KU1JVhv8MR88J3nqjoxUySV0OI 5N4XU13sXdHYAnCl7C6y700kjlTOas6pb2SdDml26o3R7qJD6Z+elI87woyqaQY5fKXw jj2vMHlsbxuxthwiM0wNModQBoVRqRPRT7CB8psqAq0/tw5mU99TYQsucmHQg68j/agn GQaw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=Zft6jLRsO2R4fi/u6eN2DfU9nqCVAT62ZsK14nFpt1E=; b=NnBiyqJ07bgRU+OoUl32PKJxx8cJqbPhf+r6D7Hb4Z0x1Tj/pCWcTxz5jLqVq70z/f j+3DY3GjJb4j4wpwi3f+phVoUeHAgxEo5DfANxrt3HLtAwNPhROh/r59IELhaMahO2aJ gfwJGUsEiiNtf/vbHKAT8CcOMbi/0fdXJQfaNa1jBMp/uzcMRSIHg7E8T0H4l4CPUhmf ieGd2O7OYsfLZylCIvpkUejNHRDHb2kqntCX3zQBwjaZENkUVm6QAQtrq++rWUxUDUQP KtmuHVgkvANNbhbFq8YYkU8OxkRTzfdnNBvUB1wUhZfhc8doq7i58lVlZsw/zbWkK0/Z dwJw== X-Gm-Message-State: AOAM5327DrhtG9+CQJsw+DATGCyRpZRjpegk0fM69Mf5u68EEaAesDdu 3ja8b9Wq+73aeVH3b2i7f4Brng== X-Received: by 2002:a05:6512:12c9:b0:473:c4c1:5558 with SMTP id p9-20020a05651212c900b00473c4c15558mr2929618lfg.75.1651850908074; Fri, 06 May 2022 08:28:28 -0700 (PDT) Received: from box.localdomain ([86.57.175.117]) by smtp.gmail.com with ESMTPSA id o11-20020ac2494b000000b0047255d2118dsm721772lfi.188.2022.05.06.08.28.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 May 2022 08:28:27 -0700 (PDT) Received: by box.localdomain (Postfix, from userid 1000) id 8AB91104AFD; Fri, 6 May 2022 18:30:13 +0300 (+03) Date: Fri, 6 May 2022 18:30:13 +0300 From: "Kirill A. Shutemov" To: Borislav Petkov Cc: "Kirill A. Shutemov" , Andy Lutomirski , Sean Christopherson , Andrew Morton , Joerg Roedel , Ard Biesheuvel , Andi Kleen , Kuppuswamy Sathyanarayanan , David Rientjes , Vlastimil Babka , Tom Lendacky , Thomas Gleixner , Peter Zijlstra , Paolo Bonzini , Ingo Molnar , Varad Gautam , Dario Faggioli , Dave Hansen , Brijesh Singh , Mike Rapoport , David Hildenbrand , x86@kernel.org, linux-mm@kvack.org, linux-coco@lists.linux.dev, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCHv5 06/12] x86/boot/compressed: Handle unaccepted memory Message-ID: <20220506153013.e6v4q2qhuhqumfiu@box.shutemov.name> References: <20220425033934.68551-1-kirill.shutemov@linux.intel.com> <20220425033934.68551-7-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, May 03, 2022 at 04:12:55PM +0200, Borislav Petkov wrote: > On Mon, Apr 25, 2022 at 06:39:28AM +0300, Kirill A. Shutemov wrote: > > diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c > > index 411b268bc0a2..59db90626042 100644 > > --- a/arch/x86/boot/compressed/kaslr.c > > +++ b/arch/x86/boot/compressed/kaslr.c > > @@ -725,10 +725,20 @@ process_efi_entries(unsigned long minimum, unsigned long image_size) > > * but in practice there's firmware where using that memory leads > > * to crashes. > > * > > - * Only EFI_CONVENTIONAL_MEMORY is guaranteed to be free. > > + * Only EFI_CONVENTIONAL_MEMORY and EFI_UNACCEPTED_MEMORY (if > > + * supported) are guaranteed to be free. > > */ > > - if (md->type != EFI_CONVENTIONAL_MEMORY) > > + > > + switch (md->type) { > > + case EFI_CONVENTIONAL_MEMORY: > > + break; > > + case EFI_UNACCEPTED_MEMORY: > > + if (IS_ENABLED(CONFIG_UNACCEPTED_MEMORY)) > > + break; > > continue; > > + default: > > + continue; > > + } > > Is there any special reason for this to be a switch-case or can it > simply be a compound conditional if (bla...) ? The equivalent 'if' statement is something like: if (md->type != EFI_CONVENTIONAL_MEMORY && !(md->type == EFI_UNACCEPTED_MEMORY && IS_ENABLED(CONFIG_UNACCEPTED_MEMORY))) continue; I find it harder to follow. Do you want me to change to the 'if' anyway? -- Kirill A. Shutemov