From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io0-f197.google.com (mail-io0-f197.google.com [209.85.223.197]) by kanga.kvack.org (Postfix) with ESMTP id 625A46B0350 for ; Tue, 27 Jun 2017 10:59:00 -0400 (EDT) Received: by mail-io0-f197.google.com with SMTP id e93so19934265ioi.7 for ; Tue, 27 Jun 2017 07:59:00 -0700 (PDT) Received: from NAM03-DM3-obe.outbound.protection.outlook.com (mail-dm3nam03on0054.outbound.protection.outlook.com. [104.47.41.54]) by mx.google.com with ESMTPS id 11si2569006itu.68.2017.06.27.07.58.59 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 27 Jun 2017 07:58:59 -0700 (PDT) From: Tom Lendacky Subject: [PATCH v8 15/38] x86/boot/e820: Add support to determine the E820 type of an address Date: Tue, 27 Jun 2017 09:58:55 -0500 Message-ID: <20170627145855.15908.1043.stgit@tlendack-t1.amdoffice.net> In-Reply-To: <20170627145607.15908.26571.stgit@tlendack-t1.amdoffice.net> References: <20170627145607.15908.26571.stgit@tlendack-t1.amdoffice.net> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: 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, xen-devel@lists.xen.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org Cc: Brijesh Singh , Toshimitsu Kani , Radim =?utf-8?b?S3LEjW3DocWZ?= , Matt Fleming , Alexander Potapenko , "H. Peter Anvin" , Larry Woodman , Jonathan Corbet , Joerg Roedel , "Michael S. Tsirkin" , Ingo Molnar , Andrey Ryabinin , Dave Young , Rik van Riel , Arnd Bergmann , Konrad Rzeszutek Wilk , Borislav Petkov , Andy Lutomirski , Boris Ostrovsky , Dmitry Vyukov , Juergen Gross , Thomas Gleixner , Paolo Bonzini Add a function that will return the E820 type associated with an address range. Reviewed-by: Borislav Petkov Signed-off-by: Tom Lendacky --- arch/x86/include/asm/e820/api.h | 2 ++ arch/x86/kernel/e820.c | 26 +++++++++++++++++++++++--- 2 files changed, 25 insertions(+), 3 deletions(-) diff --git a/arch/x86/include/asm/e820/api.h b/arch/x86/include/asm/e820/api.h index 8e0f8b8..3641f5f 100644 --- a/arch/x86/include/asm/e820/api.h +++ b/arch/x86/include/asm/e820/api.h @@ -38,6 +38,8 @@ extern void e820__reallocate_tables(void); extern void e820__register_nosave_regions(unsigned long limit_pfn); +extern int e820__get_entry_type(u64 start, u64 end); + /* * Returns true iff the specified range [start,end) is completely contained inside * the ISA region. diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c index d78a586..46c9b65 100644 --- a/arch/x86/kernel/e820.c +++ b/arch/x86/kernel/e820.c @@ -84,7 +84,8 @@ bool e820__mapped_any(u64 start, u64 end, enum e820_type type) * Note: this function only works correctly once the E820 table is sorted and * not-overlapping (at least for the range specified), which is the case normally. */ -bool __init e820__mapped_all(u64 start, u64 end, enum e820_type type) +static struct e820_entry *__e820__mapped_all(u64 start, u64 end, + enum e820_type type) { int i; @@ -110,9 +111,28 @@ bool __init e820__mapped_all(u64 start, u64 end, enum e820_type type) * coverage of the desired range exists: */ if (start >= end) - return 1; + return entry; } - return 0; + + return NULL; +} + +/* + * This function checks if the entire range is mapped with type. + */ +bool __init e820__mapped_all(u64 start, u64 end, enum e820_type type) +{ + return __e820__mapped_all(start, end, type); +} + +/* + * This function returns the type associated with the range . + */ +int e820__get_entry_type(u64 start, u64 end) +{ + struct e820_entry *entry = __e820__mapped_all(start, end, 0); + + return entry ? entry->type : -EINVAL; } /* -- 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