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authorRajithaY <rajithax.yerrumsetty@intel.com>2017-04-25 03:31:15 -0700
committerRajitha Yerrumchetty <rajithax.yerrumsetty@intel.com>2017-05-22 06:48:08 +0000
commitbb756eebdac6fd24e8919e2c43f7d2c8c4091f59 (patch)
treeca11e03542edf2d8f631efeca5e1626d211107e3 /qemu/docs/specs/parallels.txt
parenta14b48d18a9ed03ec191cf16b162206998a895ce (diff)
Adding qemu as a submodule of KVMFORNFV
This Patch includes the changes to add qemu as a submodule to kvmfornfv repo and make use of the updated latest qemu for the execution of all testcase Change-Id: I1280af507a857675c7f81d30c95255635667bdd7 Signed-off-by:RajithaY<rajithax.yerrumsetty@intel.com>
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-= License =
-
-Copyright (c) 2015 Denis Lunev
-Copyright (c) 2015 Vladimir Sementsov-Ogievskiy
-
-This work is licensed under the terms of the GNU GPL, version 2 or later.
-See the COPYING file in the top-level directory.
-
-= Parallels Expandable Image File Format =
-
-A Parallels expandable image file consists of three consecutive parts:
- * header
- * BAT
- * data area
-
-All numbers in a Parallels expandable image are stored in little-endian byte
-order.
-
-
-== Definitions ==
-
- Sector A 512-byte data chunk.
-
- Cluster A data chunk of the size specified in the image header.
- Currently, the default size is 1MiB (2048 sectors). In previous
- versions, cluster sizes of 63 sectors, 256 and 252 kilobytes were
- used.
-
- BAT Block Allocation Table, an entity that contains information for
- guest-to-host I/O data address translation.
-
-
-== Header ==
-
-The header is placed at the start of an image and contains the following
-fields:
-
-Bytes:
- 0 - 15: magic
- Must contain "WithoutFreeSpace" or "WithouFreSpacExt".
-
- 16 - 19: version
- Must be 2.
-
- 20 - 23: heads
- Disk geometry parameter for guest.
-
- 24 - 27: cylinders
- Disk geometry parameter for guest.
-
- 28 - 31: tracks
- Cluster size, in sectors.
-
- 32 - 35: nb_bat_entries
- Disk size, in clusters (BAT size).
-
- 36 - 43: nb_sectors
- Disk size, in sectors.
-
- For "WithoutFreeSpace" images:
- Only the lowest 4 bytes are used. The highest 4 bytes must be
- cleared in this case.
-
- For "WithouFreSpacExt" images, there are no such
- restrictions.
-
- 44 - 47: in_use
- Set to 0x746F6E59 when the image is opened by software in R/W
- mode; set to 0x312e3276 when the image is closed.
-
- A zero in this field means that the image was opened by an old
- version of the software that doesn't support Format Extension
- (see below).
-
- Other values are not allowed.
-
- 48 - 51: data_off
- An offset, in sectors, from the start of the file to the start of
- the data area.
-
- For "WithoutFreeSpace" images:
- - If data_off is zero, the offset is calculated as the end of BAT
- table plus some padding to ensure sector size alignment.
- - If data_off is non-zero, the offset should be aligned to sector
- size. However it is recommended to align it to cluster size for
- newly created images.
-
- For "WithouFreSpacExt" images:
- data_off must be non-zero and aligned to cluster size.
-
- 52 - 55: flags
- Miscellaneous flags.
-
- Bit 0: Empty Image bit. If set, the image should be
- considered clear.
-
- Bits 2-31: Unused.
-
- 56 - 63: ext_off
- Format Extension offset, an offset, in sectors, from the start of
- the file to the start of the Format Extension Cluster.
-
- ext_off must meet the same requirements as cluster offsets
- defined by BAT entries (see below).
-
-
-== BAT ==
-
-BAT is placed immediately after the image header. In the file, BAT is a
-contiguous array of 32-bit unsigned little-endian integers with
-(bat_entries * 4) bytes size.
-
-Each BAT entry contains an offset from the start of the file to the
-corresponding cluster. The offset set in clusters for "WithouFreSpacExt" images
-and in sectors for "WithoutFreeSpace" images.
-
-If a BAT entry is zero, the corresponding cluster is not allocated and should
-be considered as filled with zeroes.
-
-Cluster offsets specified by BAT entries must meet the following requirements:
- - the value must not be lower than data offset (provided by header.data_off
- or calculated as specified above),
- - the value must be lower than the desired file size,
- - the value must be unique among all BAT entries,
- - the result of (cluster offset - data offset) must be aligned to cluster
- size.
-
-
-== Data Area ==
-
-The data area is an area from the data offset (provided by header.data_off or
-calculated as specified above) to the end of the file. It represents a
-contiguous array of clusters. Most of them are allocated by the BAT, some may
-be allocated by the ext_off field in the header while other may be allocated by
-extensions. All clusters allocated by ext_off and extensions should meet the
-same requirements as clusters specified by BAT entries.
-
-
-== Format Extension ==
-
-The Format Extension is an area 1 cluster in size that provides additional
-format features. This cluster is addressed by the ext_off field in the header.
-The format of the Format Extension area is the following:
-
- 0 - 7: magic
- Must be 0xAB234CEF23DCEA87
-
- 8 - 23: m_CheckSum
- The MD5 checksum of the entire Header Extension cluster except
- the first 24 bytes.
-
- The above are followed by feature sections or "extensions". The last
- extension must be "End of features" (see below).
-
-Each feature section has the following format:
-
- 0 - 7: magic
- The identifier of the feature:
- 0x0000000000000000 - End of features
- 0x20385FAE252CB34A - Dirty bitmap
-
- 8 - 15: flags
- External flags for extension:
-
- Bit 0: NECESSARY
- If the software cannot load the extension (due to an
- unknown magic number or error), the file should not be
- changed. If this flag is unset and there is an error on
- loading the extension, said extension should be dropped.
-
- Bit 1: TRANSIT
- If there is an unknown extension with this flag set,
- said extension should be left as is.
-
- If neither NECESSARY nor TRANSIT are set, the extension should be
- dropped.
-
- 16 - 19: data_size
- The size of the following feature data, in bytes.
-
- 20 - 23: unused32
- Align header to 8 bytes boundary.
-
- variable: data (data_size bytes)
-
- The above is followed by padding to the next 8 bytes boundary, then the
- next extension starts.
-
- The last extension must be "End of features" with all the fields set to 0.
-
-
-=== Dirty bitmaps feature ===
-
-This feature provides a way of storing dirty bitmaps in the image. The fields
-of its data area are:
-
- 0 - 7: size
- The bitmap size, should be equal to disk size in sectors.
-
- 8 - 23: id
- An identifier for backup consistency checking.
-
- 24 - 27: granularity
- Bitmap granularity, in sectors. I.e., the number of sectors
- corresponding to one bit of the bitmap. Granularity must be
- a power of 2.
-
- 28 - 31: l1_size
- The number of entries in the L1 table of the bitmap.
-
- variable: l1 (64 * l1_size bytes)
- L1 offset table (in bytes)
-
-A dirty bitmap is stored using a one-level structure for the mapping to host
-clusters - an L1 table.
-
-Given an offset in bytes into the bitmap data, the offset in bytes into the
-image file can be obtained as follows:
-
- offset = l1_table[offset / cluster_size] + (offset % cluster_size)
-
-If an L1 table entry is 0, the corresponding cluster of the bitmap is assumed
-to be zero.
-
-If an L1 table entry is 1, the corresponding cluster of the bitmap is assumed
-to have all bits set.
-
-If an L1 table entry is not 0 or 1, it allocates a cluster from the data area.