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[209.6.122.159]) by smtp.gmail.com with ESMTPSA id i66sm4234340qkb.105.2019.11.01.18.09.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Nov 2019 18:09:33 -0700 (PDT) From: Masayoshi Mizuma To: Borislav Petkov , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , x86@kernel.org, Baoquan He Cc: Masayoshi Mizuma , Masayoshi Mizuma , linux-kernel@vger.kernel.org Subject: [PATCH v4 2/4] x86/boot: Add max_addr field in struct boot_params Date: Fri, 1 Nov 2019 21:09:09 -0400 Message-Id: <20191102010911.21460-3-msys.mizuma@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20191102010911.21460-1-msys.mizuma@gmail.com> References: <20191102010911.21460-1-msys.mizuma@gmail.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Masayoshi Mizuma Add max_addr field in struct boot_params. max_addr shows the maximum memory address to be reachable by memory hot-add. max_addr is set by parsing ACPI SRAT. Reviewed-by: Baoquan He Signed-off-by: Masayoshi Mizuma --- Documentation/x86/zero-page.rst | 4 ++++ arch/x86/include/uapi/asm/bootparam.h | 2 +- 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/Documentation/x86/zero-page.rst b/Documentation/x86/zero-page.rst index f088f5881..cc3938d68 100644 --- a/Documentation/x86/zero-page.rst +++ b/Documentation/x86/zero-page.rst @@ -19,6 +19,7 @@ Offset/Size Proto Name Meaning 058/008 ALL tboot_addr Physical address of tboot shared page 060/010 ALL ist_info Intel SpeedStep (IST) BIOS support information (struct ist_info) +078/010 ALL max_addr The possible maximum physical memory address [1]_ 080/010 ALL hd0_info hd0 disk parameter, OBSOLETE!! 090/010 ALL hd1_info hd1 disk parameter, OBSOLETE!! 0A0/010 ALL sys_desc_table System description table (struct sys_desc_table), @@ -43,3 +44,6 @@ Offset/Size Proto Name Meaning (array of struct e820_entry) D00/1EC ALL eddbuf EDD data (array of struct edd_info) =========== ===== ======================= ================================================= + +.. [1] max_addr shows the maximum memory address to be reachable by memory + hot-add. max_addr is set by parsing ACPI SRAT. diff --git a/arch/x86/include/uapi/asm/bootparam.h b/arch/x86/include/uapi/asm/bootparam.h index db1e24e56..855d30f64 100644 --- a/arch/x86/include/uapi/asm/bootparam.h +++ b/arch/x86/include/uapi/asm/bootparam.h @@ -165,7 +165,7 @@ struct boot_params { __u64 tboot_addr; /* 0x058 */ struct ist_info ist_info; /* 0x060 */ __u64 acpi_rsdp_addr; /* 0x070 */ - __u8 _pad3[8]; /* 0x078 */ + __u64 max_addr; /* 0x078 */ __u8 hd0_info[16]; /* obsolete! */ /* 0x080 */ __u8 hd1_info[16]; /* obsolete! */ /* 0x090 */ struct sys_desc_table sys_desc_table; /* obsolete! */ /* 0x0a0 */ -- 2.20.1