From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr0-f198.google.com (mail-wr0-f198.google.com [209.85.128.198]) by kanga.kvack.org (Postfix) with ESMTP id C6A84280850 for ; Sun, 21 May 2017 03:17:03 -0400 (EDT) Received: by mail-wr0-f198.google.com with SMTP id y22so10839525wry.1 for ; Sun, 21 May 2017 00:17:03 -0700 (PDT) Received: from mail.skyhub.de (mail.skyhub.de. [5.9.137.197]) by mx.google.com with ESMTP id m135si14959824wmb.30.2017.05.21.00.17.01 for ; Sun, 21 May 2017 00:17:02 -0700 (PDT) Date: Sun, 21 May 2017 09:16:50 +0200 From: Borislav Petkov Subject: Re: [PATCH v5 17/32] x86/mm: Add support to access boot related data in the clear Message-ID: <20170521071650.pwwmw4agggaazfrh@pd.tnic> References: <20170418211612.10190.82788.stgit@tlendack-t1.amdoffice.net> <20170418211921.10190.1537.stgit@tlendack-t1.amdoffice.net> <20170515183517.mb4k2gp2qobbuvtm@pd.tnic> <4845df29-bae7-9b78-0428-ff96dbef2128@amd.com> <20170518090212.kebstmnjv4h3cjf2@pd.tnic> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: Tom Lendacky Cc: linux-arch@vger.kernel.org, linux-efi@vger.kernel.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org, x86@kernel.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-mm@kvack.org, iommu@lists.linux-foundation.org, Rik van Riel , Radim =?utf-8?B?S3LEjW3DocWZ?= , Toshimitsu Kani , Arnd Bergmann , Jonathan Corbet , Matt Fleming , "Michael S. Tsirkin" , Joerg Roedel , Konrad Rzeszutek Wilk , Paolo Bonzini , Larry Woodman , Brijesh Singh , Ingo Molnar , Andy Lutomirski , "H. Peter Anvin" , Andrey Ryabinin , Alexander Potapenko , Dave Young , Thomas Gleixner , Dmitry Vyukov On Fri, May 19, 2017 at 03:50:32PM -0500, Tom Lendacky wrote: > The "worker" function would be doing the loop through the setup data, > but since the setup data is mapped inside the loop I can't do the __init > calling the non-init function and still hope to consolidate the code. > Maybe I'm missing something here... Hmm, I see what you mean. But the below change ontop doesn't fire any warnings here. Maybe your .config has something set which I don't... --- diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c index 55317ba3b6dc..199c983192ae 100644 --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -515,71 +515,50 @@ static bool memremap_is_efi_data(resource_size_t phys_addr, * Examine the physical address to determine if it is boot data by checking * it against the boot params setup_data chain. */ -static bool memremap_is_setup_data(resource_size_t phys_addr, - unsigned long size) +static bool +__memremap_is_setup_data(resource_size_t phys_addr, unsigned long size, bool early) { struct setup_data *data; u64 paddr, paddr_next; + u32 len; paddr = boot_params.hdr.setup_data; while (paddr) { - bool is_setup_data = false; if (phys_addr == paddr) return true; - data = memremap(paddr, sizeof(*data), - MEMREMAP_WB | MEMREMAP_DEC); + if (early) + data = early_memremap_decrypted(paddr, sizeof(*data)); + else + data = memremap(paddr, sizeof(*data), MEMREMAP_WB | MEMREMAP_DEC); paddr_next = data->next; + len = data->len; - if ((phys_addr > paddr) && (phys_addr < (paddr + data->len))) - is_setup_data = true; + if (early) + early_memunmap(data, sizeof(*data)); + else + memunmap(data); - memunmap(data); - if (is_setup_data) + if ((phys_addr > paddr) && (phys_addr < (paddr + data->len))) return true; paddr = paddr_next; } - return false; } -/* - * Examine the physical address to determine if it is boot data by checking - * it against the boot params setup_data chain (early boot version). - */ static bool __init early_memremap_is_setup_data(resource_size_t phys_addr, unsigned long size) { - struct setup_data *data; - u64 paddr, paddr_next; - - paddr = boot_params.hdr.setup_data; - while (paddr) { - bool is_setup_data = false; - - if (phys_addr == paddr) - return true; - - data = early_memremap_decrypted(paddr, sizeof(*data)); - - paddr_next = data->next; - - if ((phys_addr > paddr) && (phys_addr < (paddr + data->len))) - is_setup_data = true; - - early_memunmap(data, sizeof(*data)); - - if (is_setup_data) - return true; - - paddr = paddr_next; - } + return __memremap_is_setup_data(phys_addr, size, true); +} - return false; +static bool memremap_is_setup_data(resource_size_t phys_addr, unsigned long size) +{ + return __memremap_is_setup_data(phys_addr, size, false); } /* -- Regards/Gruss, Boris. Good mailing practices for 400: avoid top-posting and trim the reply. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org