The problem appears to be in the following UEFI structures:
typedef struct {
UINT8 Type; ///< 0x01 Hardware Device Path.
///< 0x02 ACPI Device Path.
///< 0x03 Messaging Device Path.
///< 0x04 Media Device Path.
///< 0x05 BIOS Boot Specification Device Path.
///< 0x7F End of Hardware Device Path.
UINT8 SubType; ///< Varies by Type
///< 0xFF End Entire Device Path, or
///< 0x01 End This Instance of a Device Path and start a new
///< Device Path.
UINT8 Length[2]; ///< Specific Device Path data. Type and Sub-Type
define
///< type of data. Size of data is included in Length.
} EFI_DEVICE_PATH_PROTOCOL;
typedef struct {
EFI_DEVICE_PATH_PROTOCOL Header;
///
/// Describes the entry in a partition table, starting with entry 1.
/// Partition number zero represents the entire device. Valid
/// partition numbers for a MBR partition are [1, 4]. Valid
/// partition numbers for a GPT partition are [1,
NumberOfPartitionEntries].
///
UINT32 PartitionNumber;
///
/// Starting LBA of the partition on the hard drive.
///
UINT64 PartitionStart;
///
/// Size of the partition in units of Logical Blocks.
///
UINT64 PartitionSize;
///
/// Signature unique to this partition:
/// If SignatureType is 0, this field has to be initialized with 16
zeros.
/// If SignatureType is 1, the MBR signature is stored in the first
4 bytes of this field.
/// The other 12 bytes are initialized with zeros.
/// If SignatureType is 2, this field contains a 16 byte signature.
///
UINT8 Signature[16];
///
/// Partition Format: (Unused values reserved).
/// 0x01 - PC-AT compatible legacy MBR.
/// 0x02 - GUID Partition Table.
///
UINT8 MBRType;
///
/// Type of Disk Signature: (Unused values reserved).
/// 0x00 - No Disk Signature.
/// 0x01 - 32-bit signature from address 0x1b8 of the type 0x01 MBR.
/// 0x02 - GUID signature.
///
UINT8 SignatureType;
} HARDDRIVE_DEVICE_PATH;
It is our guess that HARDDRIVE_DEVICE_PATH is not packed in the Ubuntu source
tree. Please confirm.
Thanks,
Abhishek
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https://bugs.launchpad.net/bugs/1272664
Title:
Installing UEFI boot entry on Hyper-V gen 2 corrupts VM configuration,
making the VM unuseable
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