Commit d907be2b authored by Maran Wilson's avatar Maran Wilson Committed by Boris Ostrovsky
Browse files

xen/pvh: Add memory map pointer to hvm_start_info struct 



The start info structure that is defined as part of the x86/HVM direct boot
ABI and used for starting Xen PVH guests would be more versatile if it also
included a way to pass information about the memory map to the guest. This
would allow KVM guests to share the same entry point.

Signed-off-by: default avatarMaran Wilson <maran.wilson@oracle.com>
Reviewed-by: default avatarJuergen Gross <jgross@suse.com>
Signed-off-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
parent a43fb7da

include/xen/interface/hvm/start_info.h

+62 −1
Original line number Diff line number Diff line
@@ -33,7 +33,7 @@ 
 *    | magic          | Contains the magic value XEN_HVM_START_MAGIC_VALUE

 *    |                | ("xEn3" with the 0x80 bit of the "E" set).

 *  4 +----------------+

 *    | version        | Version of this structure. Current version is 0. New

 *    | version        | Version of this structure. Current version is 1. New

 *    |                | versions are guaranteed to be backwards-compatible.

 *  8 +----------------+

 *    | flags          | SIF_xxx flags.
@@ -48,6 +48,15 @@ 
 * 32 +----------------+

 *    | rsdp_paddr     | Physical address of the RSDP ACPI data structure.

 * 40 +----------------+

 *    | memmap_paddr   | Physical address of the (optional) memory map. Only

 *    |                | present in version 1 and newer of the structure.

 * 48 +----------------+

 *    | memmap_entries | Number of entries in the memory map table. Zero

 *    |                | if there is no memory map being provided. Only

 *    |                | present in version 1 and newer of the structure.

 * 52 +----------------+

 *    | reserved       | Version 1 and newer only.

 * 56 +----------------+

 *

 * The layout of each entry in the module structure is the following:

 *
@@ -62,13 +71,51 @@ 
 *    | reserved       |

 * 32 +----------------+

 *

 * The layout of each entry in the memory map table is as follows:

 *

 *  0 +----------------+

 *    | addr           | Base address

 *  8 +----------------+

 *    | size           | Size of mapping in bytes

 * 16 +----------------+

 *    | type           | Type of mapping as defined between the hypervisor

 *    |                | and guest. See XEN_HVM_MEMMAP_TYPE_* values below.

 * 20 +----------------|

 *    | reserved       |

 * 24 +----------------+

 *

 * The address and sizes are always a 64bit little endian unsigned integer.

 *

 * NB: Xen on x86 will always try to place all the data below the 4GiB

 * boundary.

 *

 * Version numbers of the hvm_start_info structure have evolved like this:

 *

 * Version 0:  Initial implementation.

 *

 * Version 1:  Added the memmap_paddr/memmap_entries fields (plus 4 bytes of

 *             padding) to the end of the hvm_start_info struct. These new

 *             fields can be used to pass a memory map to the guest. The

 *             memory map is optional and so guests that understand version 1

 *             of the structure must check that memmap_entries is non-zero

 *             before trying to read the memory map.

 */

#define XEN_HVM_START_MAGIC_VALUE 0x336ec578



/*

 * The values used in the type field of the memory map table entries are

 * defined below and match the Address Range Types as defined in the "System

 * Address Map Interfaces" section of the ACPI Specification. Please refer to

 * section 15 in version 6.2 of the ACPI spec: http://uefi.org/specifications

 */

#define XEN_HVM_MEMMAP_TYPE_RAM       1

#define XEN_HVM_MEMMAP_TYPE_RESERVED  2

#define XEN_HVM_MEMMAP_TYPE_ACPI      3

#define XEN_HVM_MEMMAP_TYPE_NVS       4

#define XEN_HVM_MEMMAP_TYPE_UNUSABLE  5

#define XEN_HVM_MEMMAP_TYPE_DISABLED  6

#define XEN_HVM_MEMMAP_TYPE_PMEM      7



/*

 * C representation of the x86/HVM start info layout.

 *
@@ -86,6 +133,13 @@ struct hvm_start_info { 
    uint64_t cmdline_paddr;     /* Physical address of the command line.     */

    uint64_t rsdp_paddr;        /* Physical address of the RSDP ACPI data    */

                                /* structure.                                */

    /* All following fields only present in version 1 and newer */

    uint64_t memmap_paddr;      /* Physical address of an array of           */

                                /* hvm_memmap_table_entry.                   */

    uint32_t memmap_entries;    /* Number of entries in the memmap table.    */

                                /* Value will be zero if there is no memory  */

                                /* map being provided.                       */

    uint32_t reserved;          /* Must be zero.                             */

};



struct hvm_modlist_entry {
@@ -95,4 +149,11 @@ struct hvm_modlist_entry { 
    uint64_t reserved;

};



struct hvm_memmap_table_entry {

    uint64_t addr;              /* Base address of the memory region         */

    uint64_t size;              /* Size of the memory region in bytes        */

    uint32_t type;              /* Mapping type                              */

    uint32_t reserved;          /* Must be zero for Version 1.               */

};



#endif /* __XEN_PUBLIC_ARCH_X86_HVM_START_INFO_H__ */

CRA Git | Maintained and supported by SUSTech CRA and CCSE