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Commit 79c22318 authored by Juergen Gross's avatar Juergen Gross
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xen: update grant_table.h 

Update include/xen/interface/grant_table.h to its newest version.

This allows to drop some private definitions in grant-table.c and
include/xen/grant_table.h.
Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
Reviewed-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
parent 6d1c2f48
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Showing with 103 additions and 68 deletions
drivers/xen/grant-table.c
View file @ 79c22318
......@@ -66,8 +66,6 @@
#include <asm/sync_bitops.h>
/* External tools reserve first few grant table entries. */
#define NR_RESERVED_ENTRIES 8
#define GNTTAB_LIST_END 0xffffffff
static grant_ref_t **gnttab_list;
......@@ -1465,12 +1463,12 @@ int gnttab_init(void)
nr_init_grefs = nr_grant_frames *
gnttab_interface->grefs_per_grant_frame;
for (i = NR_RESERVED_ENTRIES; i < nr_init_grefs - 1; i++)
for (i = GNTTAB_NR_RESERVED_ENTRIES; i < nr_init_grefs - 1; i++)
gnttab_entry(i) = i + 1;
gnttab_entry(nr_init_grefs - 1) = GNTTAB_LIST_END;
gnttab_free_count = nr_init_grefs - NR_RESERVED_ENTRIES;
gnttab_free_head = NR_RESERVED_ENTRIES;
gnttab_free_count = nr_init_grefs - GNTTAB_NR_RESERVED_ENTRIES;
gnttab_free_head = GNTTAB_NR_RESERVED_ENTRIES;
printk("Grant table initialized\n");
return 0;
......
include/xen/grant_table.h
View file @ 79c22318
......@@ -57,8 +57,6 @@
#define INVALID_GRANT_REF ((grant_ref_t)-1)
#define INVALID_GRANT_HANDLE ((grant_handle_t)-1)
#define GNTTAB_RESERVED_XENSTORE 1
/* NR_GRANT_FRAMES must be less than or equal to that configured in Xen */
#define NR_GRANT_FRAMES 4
......
include/xen/interface/grant_table.h
View file @ 79c22318
......@@ -19,7 +19,8 @@
/* 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 (arch/xen/kernel/grant_table.c).
* 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.
......@@ -80,8 +81,9 @@ typedef uint32_t grant_ref_t;
*/
/*
* Version 1 of the grant table entry structure is maintained purely
* for backwards compatibility. New guests should use version 2.
* Version 1 of the grant table entry structure is maintained largely for
* backwards compatibility. New guests are recommended to support using
* version 2 to overcome version 1 limitations, but to default to version 1.
*/
struct grant_entry_v1 {
/* GTF_xxx: various type and flag information. [XEN,GST] */
......@@ -89,12 +91,21 @@ struct grant_entry_v1 {
/* The domain being granted foreign privileges. [GST] */
domid_t domid;
/*
* GTF_permit_access: Frame that @domid is allowed to map and access. [GST]
* GTF_accept_transfer: Frame whose ownership transferred by @domid. [XEN]
* GTF_permit_access: GFN that @domid is allowed to map and access. [GST]
* GTF_accept_transfer: GFN that @domid is allowed to transfer into. [GST]
* GTF_transfer_completed: MFN whose ownership transferred by @domid
* (non-translated guests only). [XEN]
*/
uint32_t frame;
};
/* 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.
......@@ -111,10 +122,13 @@ struct grant_entry_v1 {
#define GTF_type_mask (3U<<0)
/*
* Subflags for GTF_permit_access.
* Subflags for GTF_permit_access and GTF_transitive.
* 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]
* Further subflags for GTF_permit_access only.
* GTF_PAT, GTF_PWT, GTF_PCD: (x86) cache attribute flags to be used for
* mappings of 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]
......@@ -125,6 +139,12 @@ struct grant_entry_v1 {
#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)
......@@ -164,8 +184,7 @@ struct grant_entry_header {
};
/*
* Version 2 of the grant entry structure, here is a union because three
* different types are suppotted: full_page, sub_page and transitive.
* Version 2 of the grant entry structure.
*/
union grant_entry_v2 {
struct grant_entry_header hdr;
......@@ -180,9 +199,9 @@ union grant_entry_v2 {
* field of the same name in the V1 entry structure.
*/
struct {
struct grant_entry_header hdr;
uint32_t pad0;
uint64_t frame;
struct grant_entry_header hdr;
uint32_t pad0;
uint64_t frame;
} full_page;
/*
......@@ -191,10 +210,10 @@ union grant_entry_v2 {
* in frame @frame.
*/
struct {
struct grant_entry_header hdr;
uint16_t page_off;
uint16_t length;
uint64_t frame;
struct grant_entry_header hdr;
uint16_t page_off;
uint16_t length;
uint64_t frame;
} sub_page;
/*
......@@ -202,12 +221,15 @@ union grant_entry_v2 {
* 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 {
struct grant_entry_header hdr;
domid_t trans_domid;
uint16_t pad0;
grant_ref_t gref;
struct grant_entry_header hdr;
domid_t trans_domid;
uint16_t pad0;
grant_ref_t gref;
} transitive;
uint32_t __spacer[4]; /* Pad to a power of two */
......@@ -219,6 +241,21 @@ typedef uint16_t grant_status_t;
* GRANT TABLE QUERIES AND USES
*/
#define GNTTABOP_map_grant_ref 0
#define GNTTABOP_unmap_grant_ref 1
#define GNTTABOP_setup_table 2
#define GNTTABOP_dump_table 3
#define GNTTABOP_transfer 4
#define GNTTABOP_copy 5
#define GNTTABOP_query_size 6
#define GNTTABOP_unmap_and_replace 7
#define GNTTABOP_set_version 8
#define GNTTABOP_get_status_frames 9
#define GNTTABOP_get_version 10
#define GNTTABOP_swap_grant_ref 11
#define GNTTABOP_cache_flush 12
/* ` } */
/*
* Handle to track a mapping created via a grant reference.
*/
......@@ -227,7 +264,7 @@ typedef uint32_t grant_handle_t;
/*
* 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>
* that must be presented later to destroy the mapping(s). On error, <status>
* is a negative status code.
* NOTES:
* 1. If GNTMAP_device_map is specified then <dev_bus_addr> is the address
......@@ -241,7 +278,6 @@ typedef uint32_t grant_handle_t;
* host mapping is destroyed by other means then it is *NOT* guaranteed
* to be accounted to the correct grant reference!
*/
#define GNTTABOP_map_grant_ref 0
struct gnttab_map_grant_ref {
/* IN parameters. */
uint64_t host_addr;
......@@ -266,7 +302,6 @@ DEFINE_GUEST_HANDLE_STRUCT(gnttab_map_grant_ref);
* 3. After executing a batch of unmaps, it is guaranteed that no stale
* mappings will remain in the device or host TLBs.
*/
#define GNTTABOP_unmap_grant_ref 1
struct gnttab_unmap_grant_ref {
/* IN parameters. */
uint64_t host_addr;
......@@ -286,7 +321,6 @@ DEFINE_GUEST_HANDLE_STRUCT(gnttab_unmap_grant_ref);
* 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.
*/
#define GNTTABOP_setup_table 2
struct gnttab_setup_table {
/* IN parameters. */
domid_t dom;
......@@ -301,7 +335,6 @@ DEFINE_GUEST_HANDLE_STRUCT(gnttab_setup_table);
* GNTTABOP_dump_table: Dump the contents of the grant table to the
* xen console. Debugging use only.
*/
#define GNTTABOP_dump_table 3
struct gnttab_dump_table {
/* IN parameters. */
domid_t dom;
......@@ -311,17 +344,17 @@ struct gnttab_dump_table {
DEFINE_GUEST_HANDLE_STRUCT(gnttab_dump_table);
/*
* GNTTABOP_transfer_grant_ref: Transfer <frame> to a foreign domain. The
* foreign domain has previously registered its interest in the transfer via
* <domid, ref>.
* GNTTABOP_transfer: 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.
*
* Note further that only PV guests can use this operation.
*/
#define GNTTABOP_transfer 4
struct gnttab_transfer {
/* IN parameters. */
xen_pfn_t mfn;
xen_pfn_t mfn;
domid_t domid;
grant_ref_t ref;
/* OUT parameters. */
......@@ -352,21 +385,20 @@ DEFINE_GUEST_HANDLE_STRUCT(gnttab_transfer);
#define _GNTCOPY_dest_gref (1)
#define GNTCOPY_dest_gref (1<<_GNTCOPY_dest_gref)
#define GNTTABOP_copy 5
struct gnttab_copy {
/* IN parameters. */
struct {
union {
grant_ref_t ref;
xen_pfn_t gmfn;
} u;
domid_t domid;
uint16_t offset;
} source, dest;
uint16_t len;
uint16_t flags; /* GNTCOPY_* */
/* OUT parameters. */
int16_t status;
/* IN parameters. */
struct gnttab_copy_ptr {
union {
grant_ref_t ref;
xen_pfn_t gmfn;
} u;
domid_t domid;
uint16_t offset;
} source, dest;
uint16_t len;
uint16_t flags; /* GNTCOPY_* */
/* OUT parameters. */
int16_t status;
};
DEFINE_GUEST_HANDLE_STRUCT(gnttab_copy);
......@@ -377,7 +409,6 @@ DEFINE_GUEST_HANDLE_STRUCT(gnttab_copy);
* 1. <dom> may be specified as DOMID_SELF.
* 2. Only a sufficiently-privileged domain may specify <dom> != DOMID_SELF.
*/
#define GNTTABOP_query_size 6
struct gnttab_query_size {
/* IN parameters. */
domid_t dom;
......@@ -399,7 +430,6 @@ DEFINE_GUEST_HANDLE_STRUCT(gnttab_query_size);
* 2. After executing a batch of unmaps, it is guaranteed that no stale
* mappings will remain in the device or host TLBs.
*/
#define GNTTABOP_unmap_and_replace 7
struct gnttab_unmap_and_replace {
/* IN parameters. */
uint64_t host_addr;
......@@ -412,14 +442,12 @@ DEFINE_GUEST_HANDLE_STRUCT(gnttab_unmap_and_replace);
/*
* 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.
* table shared table structure. This operation may be used to toggle
* between different versions, but must be performed while no grants
* are active. The only defined versions are 1 and 2.
*/
#define GNTTABOP_set_version 8
struct gnttab_set_version {
/* IN parameters */
/* IN/OUT parameters */
uint32_t version;
};
DEFINE_GUEST_HANDLE_STRUCT(gnttab_set_version);
......@@ -436,7 +464,6 @@ DEFINE_GUEST_HANDLE_STRUCT(gnttab_set_version);
* 1. <dom> may be specified as DOMID_SELF.
* 2. Only a sufficiently-privileged domain may specify <dom> != DOMID_SELF.
*/
#define GNTTABOP_get_status_frames 9
struct gnttab_get_status_frames {
/* IN parameters. */
uint32_t nr_frames;
......@@ -451,7 +478,6 @@ DEFINE_GUEST_HANDLE_STRUCT(gnttab_get_status_frames);
* GNTTABOP_get_version: Get the grant table version which is in
* effect for domain <dom>.
*/
#define GNTTABOP_get_version 10
struct gnttab_get_version {
/* IN parameters */
domid_t dom;
......@@ -461,27 +487,38 @@ struct gnttab_get_version {
};
DEFINE_GUEST_HANDLE_STRUCT(gnttab_get_version);
/*
* GNTTABOP_swap_grant_ref: Swap the contents of two grant entries.
*/
struct gnttab_swap_grant_ref {
/* IN parameters */
grant_ref_t ref_a;
grant_ref_t ref_b;
/* OUT parameters */
int16_t status; /* GNTST_* */
};
DEFINE_GUEST_HANDLE_STRUCT(gnttab_swap_grant_ref);
/*
* Issue one or more cache maintenance operations on a portion of a
* page granted to the calling domain by a foreign domain.
*/
#define GNTTABOP_cache_flush 12
struct gnttab_cache_flush {
union {
uint64_t dev_bus_addr;
grant_ref_t 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)
uint16_t offset; /* offset from start of grant */
uint16_t length; /* size within the grant */
#define GNTTAB_CACHE_CLEAN (1u<<0)
#define GNTTAB_CACHE_INVAL (1u<<1)
#define GNTTAB_CACHE_SOURCE_GREF (1u<<31)
uint32_t op;
};
DEFINE_GUEST_HANDLE_STRUCT(gnttab_cache_flush);
/*
* Bitfield values for update_pin_status.flags.
* Bitfield values for gnttab_map_grant_ref.flags.
*/
/* Map the grant entry for access by I/O devices. */
#define _GNTMAP_device_map (0)
......@@ -531,6 +568,7 @@ DEFINE_GUEST_HANDLE_STRUCT(gnttab_cache_flush);
#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 GNTST_no_space (-13) /* Out of space (handles etc). */
#define GNTTABOP_error_msgs { \
"okay", \
......@@ -545,7 +583,8 @@ DEFINE_GUEST_HANDLE_STRUCT(gnttab_cache_flush);
"bad page", \
"copy arguments cross page boundary", \
"page address size too large", \
"operation not done; try again" \
"operation not done; try again", \
"out of space", \
}
#endif /* __XEN_PUBLIC_GRANT_TABLE_H__ */
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