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MWHPR12MB1152; 20:nduwiytLgGg75H3hQxjl9hXtONF95UKRNeFnTGlQwflUBEB6mtIU1GNklnqzDf3Dpaib5fulr1P7StYtN27EMERmKJM8O1zj3WE/FK9oOuX844ZjyEe0URDlsooczECWdKjba97jX+2RTgRNaLlsbUYCZKHotygs0pjTxiuOZGkBpSHg61mzon07XfQ8BHOal8zWCcFEVoBWY5kzKqiOwgjp9LOzF6wQGW0r2beP7KBn0xmgzOOReGZct5L6IfWQ X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Jul 2017 13:40:52.9818 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR12MB1152 Cc: Brijesh Singh , Toshimitsu Kani , "Michael S. Tsirkin" , Matt Fleming , Alexander Potapenko , "H. Peter Anvin" , Boris Ostrovsky , Jonathan Corbet , Joerg Roedel , Radim =?utf-8?b?S3LEjW3DocWZ?= , Larry Woodman , Ingo Molnar , Andrey Ryabinin , Dave Young , Rik van Riel , Arnd Bergmann , Borislav Petkov , Andy Lutomirski , Thomas Gleixner , Dmitry Vyukov , Juergen Gross , Paolo Bonzini Subject: [Xen-devel] [PATCH v9 15/38] x86/boot/e820: Add support to determine the E820 type of an address X-BeenThere: xen-devel@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP 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 a504adc..cd266d8 100644 --- a/arch/x86/include/asm/e820/api.h +++ b/arch/x86/include/asm/e820/api.h @@ -39,6 +39,8 @@ 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 532da61..71c11ad 100644 --- a/arch/x86/kernel/e820.c +++ b/arch/x86/kernel/e820.c @@ -96,7 +96,8 @@ 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; @@ -122,9 +123,28 @@ 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; } /*