<html><head><title>include/public/grant_table.h - arch-arm - Xen public headers</title></head><body><pre>
/******************************************************************************
* grant_table.h
*
* Interface for granting foreign access to page frames, and receiving
* page-ownership transfers.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Copyright (c) 2004, K A Fraser
*/
#ifndef __XEN_PUBLIC_GRANT_TABLE_H__
#define __XEN_PUBLIC_GRANT_TABLE_H__
#include "xen.h"
/*
* `incontents 150 gnttab <a name="incontents_gnttab"><strong>Grant Tables</strong></a>
*
* Xen's grant tables provide a generic mechanism to memory sharing
* between domains. This shared memory interface underpins the split
* device drivers for block and network IO.
*
* Each domain has its own grant table. This is a data structure that
* is shared with Xen; it allows the domain to tell Xen what kind of
* permissions other domains have on its pages. Entries in the grant
* table are identified by grant references. A grant reference is an
* integer, which indexes into the grant table. It acts as a
* capability which the grantee can use to perform operations on the
* granter’s memory.
*
* This capability-based system allows shared-memory communications
* between unprivileged domains. A grant reference also encapsulates
* the details of a shared page, removing the need for a domain to
* know the real machine address of a page it is sharing. This makes
* it possible to share memory correctly with domains running in
* fully virtualised memory.
*/
/***********************************
* GRANT TABLE REPRESENTATION
*/
/* Some rough guidelines on accessing and updating grant-table entries
* in a concurrency-safe manner. For more information, Linux contains a
* reference implementation for guest OSes (drivers/xen/grant_table.c, see
* http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=drivers/xen/grant-table.c;hb=HEAD
*
* NB. WMB is a no-op on current-generation x86 processors. However, a
* compiler barrier will still be required.
*
* Introducing a valid entry into the grant table:
* 1. Write ent->domid.
* 2. Write ent->frame:
* GTF_permit_access: Frame to which access is permitted.
* GTF_accept_transfer: Pseudo-phys frame slot being filled by new
* frame, or zero if none.
* 3. Write memory barrier (WMB).
* 4. Write ent->flags, inc. valid type.
*
* Invalidating an unused GTF_permit_access entry:
* 1. flags = ent->flags.
* 2. Observe that !(flags & (GTF_reading|GTF_writing)).
* 3. Check result of SMP-safe CMPXCHG(&ent->flags, flags, 0).
* NB. No need for WMB as reuse of entry is control-dependent on success of
* step 3, and all architectures guarantee ordering of ctrl-dep writes.
*
* Invalidating an in-use GTF_permit_access entry:
* This cannot be done directly. Request assistance from the domain controller
* which can set a timeout on the use of a grant entry and take necessary
* action. (NB. This is not yet implemented!).
*
* Invalidating an unused GTF_accept_transfer entry:
* 1. flags = ent->flags.
* 2. Observe that !(flags & GTF_transfer_committed). [*]
* 3. Check result of SMP-safe CMPXCHG(&ent->flags, flags, 0).
* NB. No need for WMB as reuse of entry is control-dependent on success of
* step 3, and all architectures guarantee ordering of ctrl-dep writes.
* [*] If GTF_transfer_committed is set then the grant entry is 'committed'.
* The guest must /not/ modify the grant entry until the address of the
* transferred frame is written. It is safe for the guest to spin waiting
* for this to occur (detect by observing GTF_transfer_completed in
* ent->flags).
*
* Invalidating a committed GTF_accept_transfer entry:
* 1. Wait for (ent->flags & GTF_transfer_completed).
*
* Changing a GTF_permit_access from writable to read-only:
* Use SMP-safe CMPXCHG to set GTF_readonly, while checking !GTF_writing.
*
* Changing a GTF_permit_access from read-only to writable:
* Use SMP-safe bit-setting instruction.
*/
/*
* Reference to a grant entry in a specified domain's grant table.
*/
typedef uint32_t <a name="Typedef_grant_ref_t"><strong>grant_ref_t</strong></a>;
/*
* A grant table comprises a packed array of grant entries in one or more
* page frames shared between Xen and a guest.
* [XEN]: This field is written by Xen and read by the sharing guest.
* [GST]: This field is written by the guest and read by Xen.
*/
/*
* Version 1 of the grant table entry structure is maintained purely
* for backwards compatibility. New guests should use version 2.
*/
#if __XEN_INTERFACE_VERSION__ < 0x0003020a
#define grant_entry_v1 grant_entry
#define grant_entry_v1_t grant_entry_t
#endif
<a name="Struct_grant_entry_v1"><strong>struct grant_entry_v1</strong></a> {
/* GTF_xxx: various type and flag information. [XEN,GST] */
uint16_t flags;
/* The domain being granted foreign privileges. [GST] */
<a href="include,public,xen.h.html#Typedef_domid_t">domid_t</a> domid;
/*
* GTF_permit_access: Frame that @domid is allowed to map and access. [GST]
* GTF_accept_transfer: Frame whose ownership transferred by @domid. [XEN]
*/
uint32_t frame;
};
typedef <a href="include,public,grant_table.h.html#Struct_grant_entry_v1">struct grant_entry_v1</a> grant_entry_v1_t;
/* The first few grant table entries will be preserved across grant table
* version changes and may be pre-populated at domain creation by tools.
*/
#define GNTTAB_NR_RESERVED_ENTRIES 8
#define GNTTAB_RESERVED_CONSOLE 0
#define GNTTAB_RESERVED_XENSTORE 1
/*
* Type of grant entry.
* GTF_invalid: This grant entry grants no privileges.
* GTF_permit_access: Allow @domid to map/access @frame.
* GTF_accept_transfer: Allow @domid to transfer ownership of one page frame
* to this guest. Xen writes the page number to @frame.
* GTF_transitive: Allow @domid to transitively access a subrange of
* @trans_grant in @trans_domid. No mappings are allowed.
*/
#define GTF_invalid (0U<<0)
#define GTF_permit_access (1U<<0)
#define GTF_accept_transfer (2U<<0)
#define GTF_transitive (3U<<0)
#define GTF_type_mask (3U<<0)
/*
* Subflags for GTF_permit_access.
* GTF_readonly: Restrict @domid to read-only mappings and accesses. [GST]
* GTF_reading: Grant entry is currently mapped for reading by @domid. [XEN]
* GTF_writing: Grant entry is currently mapped for writing by @domid. [XEN]
* GTF_PAT, GTF_PWT, GTF_PCD: (x86) cache attribute flags for the grant [GST]
* GTF_sub_page: Grant access to only a subrange of the page. @domid
* will only be allowed to copy from the grant, and not
* map it. [GST]
*/
#define _GTF_readonly (2)
#define GTF_readonly (1U<<_GTF_readonly)
#define _GTF_reading (3)
#define GTF_reading (1U<<_GTF_reading)
#define _GTF_writing (4)
#define GTF_writing (1U<<_GTF_writing)
#define _GTF_PWT (5)
#define GTF_PWT (1U<<_GTF_PWT)
#define _GTF_PCD (6)
#define GTF_PCD (1U<<_GTF_PCD)
#define _GTF_PAT (7)
#define GTF_PAT (1U<<_GTF_PAT)
#define _GTF_sub_page (8)
#define GTF_sub_page (1U<<_GTF_sub_page)
/*
* Subflags for GTF_accept_transfer:
* GTF_transfer_committed: Xen sets this flag to indicate that it is committed
* to transferring ownership of a page frame. When a guest sees this flag
* it must /not/ modify the grant entry until GTF_transfer_completed is
* set by Xen.
* GTF_transfer_completed: It is safe for the guest to spin-wait on this flag
* after reading GTF_transfer_committed. Xen will always write the frame
* address, followed by ORing this flag, in a timely manner.
*/
#define _GTF_transfer_committed (2)
#define GTF_transfer_committed (1U<<_GTF_transfer_committed)
#define _GTF_transfer_completed (3)
#define GTF_transfer_completed (1U<<_GTF_transfer_completed)
/*
* Version 2 grant table entries. These fulfil the same role as
* version 1 entries, but can represent more complicated operations.
* Any given domain will have either a version 1 or a version 2 table,
* and every entry in the table will be the same version.
*
* The interface by which domains use grant references does not depend
* on the grant table version in use by the other domain.
*/
#if __XEN_INTERFACE_VERSION__ >= 0x0003020a
/*
* Version 1 and version 2 grant entries share a common prefix. The
* fields of the prefix are documented as part of struct
* grant_entry_v1.
*/
<a name="Struct_grant_entry_header"><strong>struct grant_entry_header</strong></a> {
uint16_t flags;
<a href="include,public,xen.h.html#Typedef_domid_t">domid_t</a> domid;
};
typedef <a href="include,public,grant_table.h.html#Struct_grant_entry_header">struct grant_entry_header</a> <a name="Typedef_grant_entry_header_t"><strong>grant_entry_header_t</strong></a>;
/*
* Version 2 of the grant entry structure.
*/
<a name="Union_grant_entry_v2"><strong>union grant_entry_v2</strong></a> {
<a href="include,public,grant_table.h.html#Struct_grant_entry_header">grant_entry_header_t</a> hdr;
/*
* This member is used for V1-style full page grants, where either:
*
* -- hdr.type is GTF_accept_transfer, or
* -- hdr.type is GTF_permit_access and GTF_sub_page is not set.
*
* In that case, the frame field has the same semantics as the
* field of the same name in the V1 entry structure.
*/
struct {
<a href="include,public,grant_table.h.html#Struct_grant_entry_header">grant_entry_header_t</a> hdr;
uint32_t pad0;
uint64_t frame;
} full_page;
/*
* If the grant type is GTF_grant_access and GTF_sub_page is set,
* @domid is allowed to access bytes [@page_off,@page_off+@length)
* in frame @frame.
*/
struct {
<a href="include,public,grant_table.h.html#Struct_grant_entry_header">grant_entry_header_t</a> hdr;
uint16_t page_off;
uint16_t length;
uint64_t frame;
} sub_page;
/*
* If the grant is GTF_transitive, @domid is allowed to use the
* grant @gref in domain @trans_domid, as if it was the local
* domain. Obviously, the transitive access must be compatible
* with the original grant.
*
* The current version of Xen does not allow transitive grants
* to be mapped.
*/
struct {
<a href="include,public,grant_table.h.html#Struct_grant_entry_header">grant_entry_header_t</a> hdr;
<a href="include,public,xen.h.html#Typedef_domid_t">domid_t</a> trans_domid;
uint16_t pad0;
<a href="include,public,grant_table.h.html#Typedef_grant_ref_t">grant_ref_t</a> gref;
} transitive;
uint32_t __spacer[4]; /* Pad to a power of two */
};
typedef <a href="include,public,grant_table.h.html#Union_grant_entry_v2">union grant_entry_v2</a> grant_entry_v2_t;
typedef uint16_t grant_status_t;
#endif /* __XEN_INTERFACE_VERSION__ */
/***********************************
* GRANT TABLE QUERIES AND USES
*/
/* ` <a href="include,xen,errno.h.html#Enum_neg_errnoval">enum neg_errnoval</a>
* ` <a name="Func_HYPERVISOR_grant_table_op"><strong>HYPERVISOR_grant_table_op</strong></a>(<a href="include,public,grant_table.h.html#Enum_grant_table_op">enum grant_table_op</a> cmd,
* ` void *args,
* ` unsigned int count)
* ` [see <a href="include,public,xen.h.html#EnumVal___HYPERVISOR_grant_table_op">__HYPERVISOR_grant_table_op</a>]
* `
*
* @args points to an array of a per-command data structure. The array
* has @count members
*/
/* ` <a name="Enum_grant_table_op"><strong>enum grant_table_op</strong></a> { // GNTTABOP_* => struct gnttab_* */
#define <a href="include,public,grant_table.h.html#Struct_gnttab_map_grant_ref" name="EnumVal_GNTTABOP_map_grant_ref"><strong>GNTTABOP_map_grant_ref</strong></a> 0
#define <a href="include,public,grant_table.h.html#Struct_gnttab_unmap_grant_ref" name="EnumVal_GNTTABOP_unmap_grant_ref"><strong>GNTTABOP_unmap_grant_ref</strong></a> 1
#define <a href="include,public,grant_table.h.html#Struct_gnttab_setup_table" name="EnumVal_GNTTABOP_setup_table"><strong>GNTTABOP_setup_table</strong></a> 2
#define <a href="include,public,grant_table.h.html#Struct_gnttab_dump_table" name="EnumVal_GNTTABOP_dump_table"><strong>GNTTABOP_dump_table</strong></a> 3
#define <a href="include,public,grant_table.h.html#Struct_gnttab_transfer" name="EnumVal_GNTTABOP_transfer"><strong>GNTTABOP_transfer</strong></a> 4
#define <a href="include,public,grant_table.h.html#Struct_gnttab_copy" name="EnumVal_GNTTABOP_copy"><strong>GNTTABOP_copy</strong></a> 5
#define <a href="include,public,grant_table.h.html#Struct_gnttab_query_size" name="EnumVal_GNTTABOP_query_size"><strong>GNTTABOP_query_size</strong></a> 6
#define <a href="include,public,grant_table.h.html#Struct_gnttab_unmap_and_replace" name="EnumVal_GNTTABOP_unmap_and_replace"><strong>GNTTABOP_unmap_and_replace</strong></a> 7
#if __XEN_INTERFACE_VERSION__ >= 0x0003020a
#define <a href="include,public,grant_table.h.html#Struct_gnttab_set_version" name="EnumVal_GNTTABOP_set_version"><strong>GNTTABOP_set_version</strong></a> 8
#define <a href="include,public,grant_table.h.html#Struct_gnttab_get_status_frames" name="EnumVal_GNTTABOP_get_status_frames"><strong>GNTTABOP_get_status_frames</strong></a> 9
#define <a href="include,public,grant_table.h.html#Struct_gnttab_get_version" name="EnumVal_GNTTABOP_get_version"><strong>GNTTABOP_get_version</strong></a> 10
#define <a href="include,public,grant_table.h.html#Struct_gnttab_swap_grant_ref" name="EnumVal_GNTTABOP_swap_grant_ref"><strong>GNTTABOP_swap_grant_ref</strong></a> 11
#define <a href="include,public,grant_table.h.html#Struct_gnttab_cache_flush" name="EnumVal_GNTTABOP_cache_flush"><strong>GNTTABOP_cache_flush</strong></a> 12
#endif /* __XEN_INTERFACE_VERSION__ */
/* ` } */
/*
* Handle to track a mapping created via a grant reference.
*/
typedef uint32_t <a name="Typedef_grant_handle_t"><strong>grant_handle_t</strong></a>;
/*
* GNTTABOP_map_grant_ref: Map the grant entry (<dom>,<ref>) for access
* by devices and/or host CPUs. If successful, <handle> is a tracking number
* that must be presented later to destroy the mapping(s). On error, <handle>
* is a negative status code.
* NOTES:
* 1. If GNTMAP_device_map is specified then <dev_bus_addr> is the address
* via which I/O devices may access the granted frame.
* 2. If GNTMAP_host_map is specified then a mapping will be added at
* either a host virtual address in the current address space, or at
* a PTE at the specified machine address. The type of mapping to
* perform is selected through the GNTMAP_contains_pte flag, and the
* address is specified in <host_addr>.
* 3. Mappings should only be destroyed via GNTTABOP_unmap_grant_ref. If a
* host mapping is destroyed by other means then it is *NOT* guaranteed
* to be accounted to the correct grant reference!
*/
<a name="Struct_gnttab_map_grant_ref"><strong>struct gnttab_map_grant_ref</strong></a> {
/* IN parameters. */
uint64_t host_addr;
uint32_t flags; /* GNTMAP_* */
<a href="include,public,grant_table.h.html#Typedef_grant_ref_t">grant_ref_t</a> ref;
<a href="include,public,xen.h.html#Typedef_domid_t">domid_t</a> dom;
/* OUT parameters. */
int16_t status; /* => <a href="include,public,grant_table.h.html#Enum_grant_status">enum grant_status</a> */
<a href="include,public,grant_table.h.html#Typedef_grant_handle_t">grant_handle_t</a> handle;
uint64_t dev_bus_addr;
};
typedef <a href="include,public,grant_table.h.html#Struct_gnttab_map_grant_ref">struct gnttab_map_grant_ref</a> <a name="Typedef_gnttab_map_grant_ref_t"><strong>gnttab_map_grant_ref_t</strong></a>;
DEFINE_XEN_GUEST_HANDLE(<a href="include,public,grant_table.h.html#Struct_gnttab_map_grant_ref">gnttab_map_grant_ref_t</a>);
/* [see <a href="include,public,grant_table.h.html#EnumVal_GNTTABOP_map_grant_ref">GNTTABOP_map_grant_ref</a>] */
/*
* GNTTABOP_unmap_grant_ref: Destroy one or more grant-reference mappings
* tracked by <handle>. If <host_addr> or <dev_bus_addr> is zero, that
* field is ignored. If non-zero, they must refer to a device/host mapping
* that is tracked by <handle>
* NOTES:
* 1. The call may fail in an undefined manner if either mapping is not
* tracked by <handle>.
* 3. After executing a batch of unmaps, it is guaranteed that no stale
* mappings will remain in the device or host TLBs.
*/
<a name="Struct_gnttab_unmap_grant_ref"><strong>struct gnttab_unmap_grant_ref</strong></a> {
/* IN parameters. */
uint64_t host_addr;
uint64_t dev_bus_addr;
<a href="include,public,grant_table.h.html#Typedef_grant_handle_t">grant_handle_t</a> handle;
/* OUT parameters. */
int16_t status; /* => <a href="include,public,grant_table.h.html#Enum_grant_status">enum grant_status</a> */
};
typedef <a href="include,public,grant_table.h.html#Struct_gnttab_unmap_grant_ref">struct gnttab_unmap_grant_ref</a> <a name="Typedef_gnttab_unmap_grant_ref_t"><strong>gnttab_unmap_grant_ref_t</strong></a>;
DEFINE_XEN_GUEST_HANDLE(<a href="include,public,grant_table.h.html#Struct_gnttab_unmap_grant_ref">gnttab_unmap_grant_ref_t</a>);
/* [see <a href="include,public,grant_table.h.html#EnumVal_GNTTABOP_unmap_grant_ref">GNTTABOP_unmap_grant_ref</a>] */
/*
* GNTTABOP_setup_table: Set up a grant table for <dom> comprising at least
* <nr_frames> pages. The frame addresses are written to the <frame_list>.
* Only <nr_frames> addresses are written, even if the table is larger.
* NOTES:
* 1. <dom> may be specified as DOMID_SELF.
* 2. Only a sufficiently-privileged domain may specify <dom> != DOMID_SELF.
* 3. Xen may not support more than a single grant-table page per domain.
*/
<a name="Struct_gnttab_setup_table"><strong>struct gnttab_setup_table</strong></a> {
/* IN parameters. */
<a href="include,public,xen.h.html#Typedef_domid_t">domid_t</a> dom;
uint32_t nr_frames;
/* OUT parameters. */
int16_t status; /* => <a href="include,public,grant_table.h.html#Enum_grant_status">enum grant_status</a> */
#if __XEN_INTERFACE_VERSION__ < 0x00040300
XEN_GUEST_HANDLE(ulong) frame_list;
#else
XEN_GUEST_HANDLE(<a href="include,public,arch-arm.h.html#Typedef_xen_pfn_t">xen_pfn_t</a>) frame_list;
#endif
};
typedef <a href="include,public,grant_table.h.html#Struct_gnttab_setup_table">struct gnttab_setup_table</a> <a name="Typedef_gnttab_setup_table_t"><strong>gnttab_setup_table_t</strong></a>;
DEFINE_XEN_GUEST_HANDLE(<a href="include,public,grant_table.h.html#Struct_gnttab_setup_table">gnttab_setup_table_t</a>);
/* [see <a href="include,public,grant_table.h.html#EnumVal_GNTTABOP_setup_table">GNTTABOP_setup_table</a>] */
/*
* GNTTABOP_dump_table: Dump the contents of the grant table to the
* xen console. Debugging use only.
*/
<a name="Struct_gnttab_dump_table"><strong>struct gnttab_dump_table</strong></a> {
/* IN parameters. */
<a href="include,public,xen.h.html#Typedef_domid_t">domid_t</a> dom;
/* OUT parameters. */
int16_t status; /* => <a href="include,public,grant_table.h.html#Enum_grant_status">enum grant_status</a> */
};
typedef <a href="include,public,grant_table.h.html#Struct_gnttab_dump_table">struct gnttab_dump_table</a> <a name="Typedef_gnttab_dump_table_t"><strong>gnttab_dump_table_t</strong></a>;
DEFINE_XEN_GUEST_HANDLE(<a href="include,public,grant_table.h.html#Struct_gnttab_dump_table">gnttab_dump_table_t</a>);
/* [see <a href="include,public,grant_table.h.html#EnumVal_GNTTABOP_dump_table">GNTTABOP_dump_table</a>] */
/*
* GNTTABOP_transfer_grant_ref: Transfer <frame> to a foreign domain. The
* foreign domain has previously registered its interest in the transfer via
* <domid, ref>.
*
* Note that, even if the transfer fails, the specified page no longer belongs
* to the calling domain *unless* the error is GNTST_bad_page.
*/
<a name="Struct_gnttab_transfer"><strong>struct gnttab_transfer</strong></a> {
/* IN parameters. */
<a href="include,public,arch-arm.h.html#Typedef_xen_pfn_t">xen_pfn_t</a> mfn;
<a href="include,public,xen.h.html#Typedef_domid_t">domid_t</a> domid;
<a href="include,public,grant_table.h.html#Typedef_grant_ref_t">grant_ref_t</a> ref;
/* OUT parameters. */
int16_t status;
};
typedef <a href="include,public,grant_table.h.html#Struct_gnttab_transfer">struct gnttab_transfer</a> <a name="Typedef_gnttab_transfer_t"><strong>gnttab_transfer_t</strong></a>;
DEFINE_XEN_GUEST_HANDLE(<a href="include,public,grant_table.h.html#Struct_gnttab_transfer">gnttab_transfer_t</a>);
/* [see <a href="include,public,grant_table.h.html#EnumVal_GNTTABOP_transfer">GNTTABOP_transfer</a>] */
/*
* GNTTABOP_copy: Hypervisor based copy
* source and destinations can be eithers MFNs or, for foreign domains,
* grant references. the foreign domain has to grant read/write access
* in its grant table.
*
* The flags specify what type source and destinations are (either MFN
* or grant reference).
*
* Note that this can also be used to copy data between two domains
* via a third party if the source and destination domains had previously
* grant appropriate access to their pages to the third party.
*
* source_offset specifies an offset in the source frame, dest_offset
* the offset in the target frame and len specifies the number of
* bytes to be copied.
*/
#define _GNTCOPY_source_gref (0)
#define GNTCOPY_source_gref (1<<_GNTCOPY_source_gref)
#define _GNTCOPY_dest_gref (1)
#define GNTCOPY_dest_gref (1<<_GNTCOPY_dest_gref)
<a name="Struct_gnttab_copy"><strong>struct gnttab_copy</strong></a> {
/* IN parameters. */
struct {
union {
<a href="include,public,grant_table.h.html#Typedef_grant_ref_t">grant_ref_t</a> ref;
<a href="include,public,arch-arm.h.html#Typedef_xen_pfn_t">xen_pfn_t</a> gmfn;
} u;
<a href="include,public,xen.h.html#Typedef_domid_t">domid_t</a> domid;
uint16_t offset;
} source, dest;
uint16_t len;
uint16_t flags; /* GNTCOPY_* */
/* OUT parameters. */
int16_t status;
};
typedef <a href="include,public,grant_table.h.html#Struct_gnttab_copy">struct gnttab_copy</a> <a name="Typedef_gnttab_copy_t"><strong>gnttab_copy_t</strong></a>;
DEFINE_XEN_GUEST_HANDLE(<a href="include,public,grant_table.h.html#Struct_gnttab_copy">gnttab_copy_t</a>);
/* [see <a href="include,public,grant_table.h.html#EnumVal_GNTTABOP_copy">GNTTABOP_copy</a>] */
/*
* GNTTABOP_query_size: Query the current and maximum sizes of the shared
* grant table.
* NOTES:
* 1. <dom> may be specified as DOMID_SELF.
* 2. Only a sufficiently-privileged domain may specify <dom> != DOMID_SELF.
*/
<a name="Struct_gnttab_query_size"><strong>struct gnttab_query_size</strong></a> {
/* IN parameters. */
<a href="include,public,xen.h.html#Typedef_domid_t">domid_t</a> dom;
/* OUT parameters. */
uint32_t nr_frames;
uint32_t max_nr_frames;
int16_t status; /* => <a href="include,public,grant_table.h.html#Enum_grant_status">enum grant_status</a> */
};
typedef <a href="include,public,grant_table.h.html#Struct_gnttab_query_size">struct gnttab_query_size</a> <a name="Typedef_gnttab_query_size_t"><strong>gnttab_query_size_t</strong></a>;
DEFINE_XEN_GUEST_HANDLE(<a href="include,public,grant_table.h.html#Struct_gnttab_query_size">gnttab_query_size_t</a>);
/* [see <a href="include,public,grant_table.h.html#EnumVal_GNTTABOP_query_size">GNTTABOP_query_size</a>] */
/*
* GNTTABOP_unmap_and_replace: Destroy one or more grant-reference mappings
* tracked by <handle> but atomically replace the page table entry with one
* pointing to the machine address under <new_addr>. <new_addr> will be
* redirected to the null entry.
* NOTES:
* 1. The call may fail in an undefined manner if either mapping is not
* tracked by <handle>.
* 2. After executing a batch of unmaps, it is guaranteed that no stale
* mappings will remain in the device or host TLBs.
*/
<a name="Struct_gnttab_unmap_and_replace"><strong>struct gnttab_unmap_and_replace</strong></a> {
/* IN parameters. */
uint64_t host_addr;
uint64_t new_addr;
<a href="include,public,grant_table.h.html#Typedef_grant_handle_t">grant_handle_t</a> handle;
/* OUT parameters. */
int16_t status; /* => <a href="include,public,grant_table.h.html#Enum_grant_status">enum grant_status</a> */
};
typedef <a href="include,public,grant_table.h.html#Struct_gnttab_unmap_and_replace">struct gnttab_unmap_and_replace</a> <a name="Typedef_gnttab_unmap_and_replace_t"><strong>gnttab_unmap_and_replace_t</strong></a>;
DEFINE_XEN_GUEST_HANDLE(<a href="include,public,grant_table.h.html#Struct_gnttab_unmap_and_replace">gnttab_unmap_and_replace_t</a>);
/* [see <a href="include,public,grant_table.h.html#EnumVal_GNTTABOP_unmap_and_replace">GNTTABOP_unmap_and_replace</a>] */
#if __XEN_INTERFACE_VERSION__ >= 0x0003020a
/*
* GNTTABOP_set_version: Request a particular version of the grant
* table shared table structure. This operation can only be performed
* once in any given domain. It must be performed before any grants
* are activated; otherwise, the domain will be stuck with version 1.
* The only defined versions are 1 and 2.
*/
<a name="Struct_gnttab_set_version"><strong>struct gnttab_set_version</strong></a> {
/* IN/OUT parameters */
uint32_t version;
};
typedef <a href="include,public,grant_table.h.html#Struct_gnttab_set_version">struct gnttab_set_version</a> <a name="Typedef_gnttab_set_version_t"><strong>gnttab_set_version_t</strong></a>;
DEFINE_XEN_GUEST_HANDLE(<a href="include,public,grant_table.h.html#Struct_gnttab_set_version">gnttab_set_version_t</a>);
/* [see <a href="include,public,grant_table.h.html#EnumVal_GNTTABOP_set_version">GNTTABOP_set_version</a>] */
/*
* GNTTABOP_get_status_frames: Get the list of frames used to store grant
* status for <dom>. In grant format version 2, the status is separated
* from the other shared grant fields to allow more efficient synchronization
* using barriers instead of atomic cmpexch operations.
* <nr_frames> specify the size of vector <frame_list>.
* The frame addresses are returned in the <frame_list>.
* Only <nr_frames> addresses are returned, even if the table is larger.
* NOTES:
* 1. <dom> may be specified as DOMID_SELF.
* 2. Only a sufficiently-privileged domain may specify <dom> != DOMID_SELF.
*/
<a name="Struct_gnttab_get_status_frames"><strong>struct gnttab_get_status_frames</strong></a> {
/* IN parameters. */
uint32_t nr_frames;
<a href="include,public,xen.h.html#Typedef_domid_t">domid_t</a> dom;
/* OUT parameters. */
int16_t status; /* => <a href="include,public,grant_table.h.html#Enum_grant_status">enum grant_status</a> */
XEN_GUEST_HANDLE(uint64_t) frame_list;
};
typedef <a href="include,public,grant_table.h.html#Struct_gnttab_get_status_frames">struct gnttab_get_status_frames</a> <a name="Typedef_gnttab_get_status_frames_t"><strong>gnttab_get_status_frames_t</strong></a>;
DEFINE_XEN_GUEST_HANDLE(<a href="include,public,grant_table.h.html#Struct_gnttab_get_status_frames">gnttab_get_status_frames_t</a>);
/* [see <a href="include,public,grant_table.h.html#EnumVal_GNTTABOP_get_status_frames">GNTTABOP_get_status_frames</a>] */
/*
* GNTTABOP_get_version: Get the grant table version which is in
* effect for domain <dom>.
*/
<a name="Struct_gnttab_get_version"><strong>struct gnttab_get_version</strong></a> {
/* IN parameters */
<a href="include,public,xen.h.html#Typedef_domid_t">domid_t</a> dom;
uint16_t pad;
/* OUT parameters */
uint32_t version;
};
typedef <a href="include,public,grant_table.h.html#Struct_gnttab_get_version">struct gnttab_get_version</a> <a name="Typedef_gnttab_get_version_t"><strong>gnttab_get_version_t</strong></a>;
DEFINE_XEN_GUEST_HANDLE(<a href="include,public,grant_table.h.html#Struct_gnttab_get_version">gnttab_get_version_t</a>);
/* [see <a href="include,public,grant_table.h.html#EnumVal_GNTTABOP_get_version">GNTTABOP_get_version</a>] */
/*
* GNTTABOP_swap_grant_ref: Swap the contents of two grant entries.
*/
<a name="Struct_gnttab_swap_grant_ref"><strong>struct gnttab_swap_grant_ref</strong></a> {
/* IN parameters */
<a href="include,public,grant_table.h.html#Typedef_grant_ref_t">grant_ref_t</a> ref_a;
<a href="include,public,grant_table.h.html#Typedef_grant_ref_t">grant_ref_t</a> ref_b;
/* OUT parameters */
int16_t status; /* => <a href="include,public,grant_table.h.html#Enum_grant_status">enum grant_status</a> */
};
typedef <a href="include,public,grant_table.h.html#Struct_gnttab_swap_grant_ref">struct gnttab_swap_grant_ref</a> <a name="Typedef_gnttab_swap_grant_ref_t"><strong>gnttab_swap_grant_ref_t</strong></a>;
DEFINE_XEN_GUEST_HANDLE(<a href="include,public,grant_table.h.html#Struct_gnttab_swap_grant_ref">gnttab_swap_grant_ref_t</a>);
/* [see <a href="include,public,grant_table.h.html#EnumVal_GNTTABOP_swap_grant_ref">GNTTABOP_swap_grant_ref</a>] */
/*
* Issue one or more cache maintenance operations on a portion of a
* page granted to the calling domain by a foreign domain.
*/
<a name="Struct_gnttab_cache_flush"><strong>struct gnttab_cache_flush</strong></a> {
union {
uint64_t dev_bus_addr;
<a href="include,public,grant_table.h.html#Typedef_grant_ref_t">grant_ref_t</a> ref;
} a;
uint16_t offset; /* offset from start of grant */
uint16_t length; /* size within the grant */
#define GNTTAB_CACHE_CLEAN (1<<0)
#define GNTTAB_CACHE_INVAL (1<<1)
#define GNTTAB_CACHE_SOURCE_GREF (1<<31)
uint32_t op;
};
typedef <a href="include,public,grant_table.h.html#Struct_gnttab_cache_flush">struct gnttab_cache_flush</a> <a name="Typedef_gnttab_cache_flush_t"><strong>gnttab_cache_flush_t</strong></a>;
DEFINE_XEN_GUEST_HANDLE(<a href="include,public,grant_table.h.html#Struct_gnttab_cache_flush">gnttab_cache_flush_t</a>);
/* [see <a href="include,public,grant_table.h.html#EnumVal_GNTTABOP_cache_flush">GNTTABOP_cache_flush</a>] */
#endif /* __XEN_INTERFACE_VERSION__ */
/*
* Bitfield values for gnttab_map_grant_ref.flags.
*/
/* Map the grant entry for access by I/O devices. */
#define _GNTMAP_device_map (0)
#define GNTMAP_device_map (1<<_GNTMAP_device_map)
/* Map the grant entry for access by host CPUs. */
#define _GNTMAP_host_map (1)
#define GNTMAP_host_map (1<<_GNTMAP_host_map)
/* Accesses to the granted frame will be restricted to read-only access. */
#define _GNTMAP_readonly (2)
#define GNTMAP_readonly (1<<_GNTMAP_readonly)
/*
* GNTMAP_host_map subflag:
* 0 => The host mapping is usable only by the guest OS.
* 1 => The host mapping is usable by guest OS + current application.
*/
#define _GNTMAP_application_map (3)
#define GNTMAP_application_map (1<<_GNTMAP_application_map)
/*
* GNTMAP_contains_pte subflag:
* 0 => This map request contains a host virtual address.
* 1 => This map request contains the machine addess of the PTE to update.
*/
#define _GNTMAP_contains_pte (4)
#define GNTMAP_contains_pte (1<<_GNTMAP_contains_pte)
#define _GNTMAP_can_fail (5)
#define GNTMAP_can_fail (1<<_GNTMAP_can_fail)
/*
* Bits to be placed in guest kernel available PTE bits (architecture
* dependent; only supported when XENFEAT_gnttab_map_avail_bits is set).
*/
#define _GNTMAP_guest_avail0 (16)
#define GNTMAP_guest_avail_mask ((uint32_t)~0 << _GNTMAP_guest_avail0)
/*
* Values for error status returns. All errors are -ve.
*/
/* ` <a name="Enum_grant_status"><strong>enum grant_status</strong></a> { */
#define GNTST_okay (0) /* Normal return. */
#define GNTST_general_error (-1) /* General undefined error. */
#define GNTST_bad_domain (-2) /* Unrecognsed domain id. */
#define GNTST_bad_gntref (-3) /* Unrecognised or inappropriate gntref. */
#define GNTST_bad_handle (-4) /* Unrecognised or inappropriate handle. */
#define GNTST_bad_virt_addr (-5) /* Inappropriate virtual address to map. */
#define GNTST_bad_dev_addr (-6) /* Inappropriate device address to unmap.*/
#define GNTST_no_device_space (-7) /* Out of space in I/O MMU. */
#define GNTST_permission_denied (-8) /* Not enough privilege for operation. */
#define GNTST_bad_page (-9) /* Specified page was invalid for op. */
#define GNTST_bad_copy_arg (-10) /* copy arguments cross page boundary. */
#define GNTST_address_too_big (-11) /* transfer page address too large. */
#define GNTST_eagain (-12) /* Operation not done; try again. */
/* ` } */
#define GNTTABOP_error_msgs { \
"okay", \
"undefined error", \
"unrecognised domain id", \
"invalid grant reference", \
"invalid mapping handle", \
"invalid virtual address", \
"invalid device address", \
"no spare translation slot in the I/O MMU", \
"permission denied", \
"bad page", \
"copy arguments cross page boundary", \
"page address size too large", \
"operation not done; try again" \
}
#endif /* __XEN_PUBLIC_GRANT_TABLE_H__ */
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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