【免费】NVMeBoot原理和技术说明详细内容

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NVM Express

Boot Specification

Revision 1.0

November 15th, 2022

Please send comments to info@nvmexpress.org

NVM Express

Boot Specification, Revision 1.0

NVM Express

Boot Specification, Revision 1.0 is available for download at https://nvmexpress.org. The

NVM Express Boot Specification, Revision 1.0 incorporates TP8012.

SPECIFICATION DISCLAIMER

LEGAL NOTICE:

This NVM Express Boot Specification, revision 1.0 is proprietary to the NVM Express, Inc. (also referred to

as “Company”) and/or its successors and assigns.

NOTICE TO USERS WHO ARE NVM EXPRESS, INC. MEMBERS: Members of NVM Express, Inc. have

the right to use and implement this NVM Express Boot Specification subject, however, to the Member’s

continued compliance with the Company’s Intellectual Property Policy and Bylaws and the Member’s

Participation Agreement.

NOTICE TO NON-MEMBERS OF NVM EXPRESS, INC.: If you are not a Member of NVM Express, Inc.

and you have obtained a copy of this document, you only have a right to review this document or make

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permission of NVM Express, Inc. Nothing contained in this document shall be deemed as granting you any

kind of license to implement or use this document or the specification described therein, or any of its

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info@nvmexpress.org

NVM Express

Boot Specification, Revision 1.0

iii

Table of Contents

1 INTRODUCTION........................................................................................................... 1

1.1 Overview ............................................................................................................................................ 1

1.2 Scope ................................................................................................................................................. 1

1.3 Definitions .......................................................................................................................................... 2

1.3.1 Boot Device .................................................................................................................................................2

1.3.2 Discovery Controller (DC) ...........................................................................................................................2

1.3.3 Diffie-Hellman (DH) .....................................................................................................................................2

1.3.4 Discovery Log Page (DLP) ..........................................................................................................................2

1.3.5 EFI System Partition (ESP) .........................................................................................................................2

1.3.6 Heap Space ................................................................................................................................................2

1.3.7 Host Fabric Interface (HFI) ..........................................................................................................................2

1.3.8 iSCSI Boot Firmware Table (iBFT) ..............................................................................................................3

1.3.9 Namespace (NS) .........................................................................................................................................3

1.3.10 Namespace ID (NSID) .................................................................................................................................3

1.3.11 Namespace Identifier (NID) .........................................................................................................................3

1.3.12 NVM Subsystem .........................................................................................................................................3

1.3.13 NVM Subsystem Port ..................................................................................................................................3

1.3.14 NVMe Boot Firmware Table (NBFT) ...........................................................................................................3

1.3.15 NVMe over Fabrics (NVMe-oF) ...................................................................................................................3

1.3.16 NVMe Qualified Name (NQN) .....................................................................................................................3

1.3.17 Platform .......................................................................................................................................................3

1.3.18 Pre-OS Driver ..............................................................................................................................................4

1.3.19 Storage Subsystem .....................................................................................................................................4

1.3.20 Subsystem and Namespace Descriptor (SSNS) .........................................................................................4

1.3.21 Unified Extensible Firmware Interface (UEFI) .............................................................................................4

1.3.22 UEFI Human Interface Infrastructure (UEFI HII) .........................................................................................4

1.3.23 Extended System Description Table (XSDT) ..............................................................................................4

1.4 References ........................................................................................................................................ 4

1.5 Conventions ....................................................................................................................................... 6

1.5.1 Keywords ....................................................................................................................................................6

1.5.2 Numerical Descriptions ...............................................................................................................................6

1.5.3 Byte, Word, and Dword Relationships .........................................................................................................8

1.5.4 Data Endian-ness ........................................................................................................................................8

1.5.5 IP Addresses and Formatting ......................................................................................................................9

1.5.6 Host Name String Format ............................................................................................................................9

1.5.7 NVMe-oF URI Format .................................................................................................................................9

1.5.8 Optional and Mandatory Fields in Tables .................................................................................................. 10

1.5.9 Namespace Identifier String Formats ........................................................................................................ 10

2 BACKGROUND AND GENERAL METHODOLOGY ............................................................... 12

2.1 Booting from NVMe ......................................................................................................................... 12

2.1.1 Boot from NVMe: PCIe Transport ............................................................................................................. 12

2.1.2 Boot from NVMe-oF: FC Transport ........................................................................................................... 12

2.1.3 Boot from NVMe-oF: TCP Transport ......................................................................................................... 13

3 BOOT MECHANISMS .................................................................................................. 14

3.1 ACPI NVMe Boot Firmware Table (NBFT) ...................................................................................... 14

3.1.1 NBFT Table Overview ............................................................................................................................... 14

3.1.2 NBFT Structure ......................................................................................................................................... 16

ANNEX A. BOOTING (INFORMATIVE) ......................................................................... 35

A.1 Domain Specific Terms.................................................................................................................... 35

A.1.1 SCSI Logical Unit Number (LUN) .............................................................................................................. 35

NVM Express

Boot Specification, Revision 1.0

A.1.2 UEFI Boot Device ...................................................................................................................................... 35

A.1.3 UEFI Boot Services ................................................................................................................................... 35

A.1.4 UEFI Device Handle .................................................................................................................................. 35

A.1.5 UEFI Device Path ...................................................................................................................................... 35

A.1.6 UEFI Device Path Protocol ........................................................................................................................ 35

A.1.7 UEFI Protocol ............................................................................................................................................ 35

A.2 Boot from SAN Ontology and Concepts .......................................................................................... 36

A.2.1 Boot from Block Storage Device ............................................................................................................... 36

A.2.2 Boot from SCSI-based Block Storage ....................................................................................................... 37

A.2.3 Boot from SAN: Fibre Channel Storage .................................................................................................... 37

A.2.4 Boot from SAN: iSCSI Storage .................................................................................................................. 37

A.2.5 Boot from NVMe-oF .................................................................................................................................. 38

A.2.6 Configure Boot from NVMe-oF .................................................................................................................. 39

A.2.7 Boot Process ............................................................................................................................................. 39

A.3 Transport Specific and interface specific semantics ....................................................................... 41

A.3.1 ACPI NBFT Discussion and Background .................................................................................................. 41

A.3.2 Implementation considerations .................................................................................................................. 44

A.4 OS Specific Details and Application Considerations ....................................................................... 45

A.4.1 Generic OS Usage of the NBFT ................................................................................................................ 46

A.4.2 Linux .......................................................................................................................................................... 46

NVM Express

Boot Specification, Revision 1.0

Table of Figures

Figure 1: NVMe Family of Specifications ....................................................................................................................... 1

Figure 2: Decimal and Binary Units ................................................................................................................................ 7

Figure 3: Byte, Word, and Dword Relationships ............................................................................................................ 8

Figure 4: IPv4 in IPv6 Format......................................................................................................................................... 9

Figure 5: NBFT Elements ............................................................................................................................................. 14

Figure 6: NBFT Layout ................................................................................................................................................. 15

Figure 7: NBFT Interface Transport Types ................................................................................................................... 16

Figure 8: NBFT Table ................................................................................................................................................... 16

Figure 9: Host Descriptor ............................................................................................................................................. 20

Figure 10: Host Fabric Interface (HFI) Descriptor List .................................................................................................. 21

Figure 11: Host Fabric Interface (HFI) Descriptor ........................................................................................................ 21

Figure 12: HFI Transport Info Descriptor Header Template ......................................................................................... 22

Figure 13: HFI Transport Info Descriptor – NVMe/TCP ................................................................................................ 22

Figure 14: Subsystem Namespace Descriptor List ...................................................................................................... 24

Figure 15: Subsystem Namespace (SSNS) Descriptor ................................................................................................ 24

Figure 16: Subsystem and Namespace Specific Flags Field ....................................................................................... 26

Figure 17: SSNS Transport Specific Flags Field .......................................................................................................... 27

Figure 18: DHCP Root-Path Elements ......................................................................................................................... 28

Figure 19: Subsystem and Namespace Extended Information Descriptor ................................................................... 29

Figure 20: Security Profile Descriptor List .................................................................................................................... 30

Figure 21: Security Profile Descriptor ........................................................................................................................... 30

Figure 22: Security Profile Descriptor Flags ................................................................................................................. 32

Figure 23: Discovery Descriptor List ............................................................................................................................ 33

Figure 24: Discovery Descriptor ................................................................................................................................... 34

Figure 25: UEFI Network stack differences between booting from iSCSI and booting from NVMe/TCP ...................... 39

Figure 26: Modern EDK2 UEFI Boot Flow ................................................................................................................... 41

Figure 27: Required NVMe/TCP host NBFT information with example data ................................................................ 42

Figure 28: Example Subsystem and Namespace descriptor ........................................................................................ 44

Figure 29: Common Linux boot namespaces and expectations on NBFT content ....................................................... 47