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568 lines
20 KiB
568 lines
20 KiB
/****************************************************************************** |
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* grant_table.h |
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* |
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* Interface for granting foreign access to page frames, and receiving |
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* page-ownership transfers. |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to |
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* deal in the Software without restriction, including without limitation the |
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
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* sell copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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* DEALINGS IN THE SOFTWARE. |
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* |
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* Copyright (c) 2004, K A Fraser |
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*/ |
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#ifndef __XEN_PUBLIC_GRANT_TABLE_H__ |
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#define __XEN_PUBLIC_GRANT_TABLE_H__ |
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#include <xen/interface/xen.h> |
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|
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/*********************************** |
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* GRANT TABLE REPRESENTATION |
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*/ |
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|
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/* Some rough guidelines on accessing and updating grant-table entries |
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* in a concurrency-safe manner. For more information, Linux contains a |
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* reference implementation for guest OSes (arch/xen/kernel/grant_table.c). |
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* |
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* NB. WMB is a no-op on current-generation x86 processors. However, a |
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* compiler barrier will still be required. |
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* |
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* Introducing a valid entry into the grant table: |
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* 1. Write ent->domid. |
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* 2. Write ent->frame: |
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* GTF_permit_access: Frame to which access is permitted. |
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* GTF_accept_transfer: Pseudo-phys frame slot being filled by new |
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* frame, or zero if none. |
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* 3. Write memory barrier (WMB). |
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* 4. Write ent->flags, inc. valid type. |
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* |
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* Invalidating an unused GTF_permit_access entry: |
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* 1. flags = ent->flags. |
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* 2. Observe that !(flags & (GTF_reading|GTF_writing)). |
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* 3. Check result of SMP-safe CMPXCHG(&ent->flags, flags, 0). |
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* NB. No need for WMB as reuse of entry is control-dependent on success of |
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* step 3, and all architectures guarantee ordering of ctrl-dep writes. |
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* |
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* Invalidating an in-use GTF_permit_access entry: |
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* This cannot be done directly. Request assistance from the domain controller |
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* which can set a timeout on the use of a grant entry and take necessary |
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* action. (NB. This is not yet implemented!). |
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* |
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* Invalidating an unused GTF_accept_transfer entry: |
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* 1. flags = ent->flags. |
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* 2. Observe that !(flags & GTF_transfer_committed). [*] |
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* 3. Check result of SMP-safe CMPXCHG(&ent->flags, flags, 0). |
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* NB. No need for WMB as reuse of entry is control-dependent on success of |
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* step 3, and all architectures guarantee ordering of ctrl-dep writes. |
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* [*] If GTF_transfer_committed is set then the grant entry is 'committed'. |
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* The guest must /not/ modify the grant entry until the address of the |
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* transferred frame is written. It is safe for the guest to spin waiting |
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* for this to occur (detect by observing GTF_transfer_completed in |
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* ent->flags). |
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* |
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* Invalidating a committed GTF_accept_transfer entry: |
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* 1. Wait for (ent->flags & GTF_transfer_completed). |
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* |
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* Changing a GTF_permit_access from writable to read-only: |
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* Use SMP-safe CMPXCHG to set GTF_readonly, while checking !GTF_writing. |
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* |
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* Changing a GTF_permit_access from read-only to writable: |
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* Use SMP-safe bit-setting instruction. |
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*/ |
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|
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/* |
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* Reference to a grant entry in a specified domain's grant table. |
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*/ |
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typedef uint32_t grant_ref_t; |
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|
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/* |
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* A grant table comprises a packed array of grant entries in one or more |
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* page frames shared between Xen and a guest. |
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* [XEN]: This field is written by Xen and read by the sharing guest. |
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* [GST]: This field is written by the guest and read by Xen. |
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*/ |
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|
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/* |
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* Version 1 of the grant table entry structure is maintained purely |
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* for backwards compatibility. New guests should use version 2. |
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*/ |
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struct grant_entry_v1 { |
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/* GTF_xxx: various type and flag information. [XEN,GST] */ |
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uint16_t flags; |
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/* The domain being granted foreign privileges. [GST] */ |
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domid_t domid; |
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/* |
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* GTF_permit_access: Frame that @domid is allowed to map and access. [GST] |
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* GTF_accept_transfer: Frame whose ownership transferred by @domid. [XEN] |
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*/ |
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uint32_t frame; |
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}; |
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|
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/* |
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* Type of grant entry. |
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* GTF_invalid: This grant entry grants no privileges. |
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* GTF_permit_access: Allow @domid to map/access @frame. |
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* GTF_accept_transfer: Allow @domid to transfer ownership of one page frame |
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* to this guest. Xen writes the page number to @frame. |
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* GTF_transitive: Allow @domid to transitively access a subrange of |
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* @trans_grant in @trans_domid. No mappings are allowed. |
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*/ |
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#define GTF_invalid (0U<<0) |
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#define GTF_permit_access (1U<<0) |
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#define GTF_accept_transfer (2U<<0) |
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#define GTF_transitive (3U<<0) |
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#define GTF_type_mask (3U<<0) |
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|
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/* |
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* Subflags for GTF_permit_access. |
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* GTF_readonly: Restrict @domid to read-only mappings and accesses. [GST] |
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* GTF_reading: Grant entry is currently mapped for reading by @domid. [XEN] |
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* GTF_writing: Grant entry is currently mapped for writing by @domid. [XEN] |
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* GTF_sub_page: Grant access to only a subrange of the page. @domid |
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* will only be allowed to copy from the grant, and not |
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* map it. [GST] |
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*/ |
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#define _GTF_readonly (2) |
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#define GTF_readonly (1U<<_GTF_readonly) |
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#define _GTF_reading (3) |
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#define GTF_reading (1U<<_GTF_reading) |
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#define _GTF_writing (4) |
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#define GTF_writing (1U<<_GTF_writing) |
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#define _GTF_sub_page (8) |
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#define GTF_sub_page (1U<<_GTF_sub_page) |
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/* |
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* Subflags for GTF_accept_transfer: |
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* GTF_transfer_committed: Xen sets this flag to indicate that it is committed |
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* to transferring ownership of a page frame. When a guest sees this flag |
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* it must /not/ modify the grant entry until GTF_transfer_completed is |
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* set by Xen. |
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* GTF_transfer_completed: It is safe for the guest to spin-wait on this flag |
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* after reading GTF_transfer_committed. Xen will always write the frame |
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* address, followed by ORing this flag, in a timely manner. |
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*/ |
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#define _GTF_transfer_committed (2) |
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#define GTF_transfer_committed (1U<<_GTF_transfer_committed) |
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#define _GTF_transfer_completed (3) |
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#define GTF_transfer_completed (1U<<_GTF_transfer_completed) |
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/* |
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* Version 2 grant table entries. These fulfil the same role as |
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* version 1 entries, but can represent more complicated operations. |
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* Any given domain will have either a version 1 or a version 2 table, |
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* and every entry in the table will be the same version. |
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* |
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* The interface by which domains use grant references does not depend |
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* on the grant table version in use by the other domain. |
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*/ |
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/* |
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* Version 1 and version 2 grant entries share a common prefix. The |
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* fields of the prefix are documented as part of struct |
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* grant_entry_v1. |
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*/ |
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struct grant_entry_header { |
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uint16_t flags; |
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domid_t domid; |
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}; |
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/* |
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* Version 2 of the grant entry structure, here is a union because three |
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* different types are suppotted: full_page, sub_page and transitive. |
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*/ |
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union grant_entry_v2 { |
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struct grant_entry_header hdr; |
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/* |
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* This member is used for V1-style full page grants, where either: |
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* |
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* -- hdr.type is GTF_accept_transfer, or |
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* -- hdr.type is GTF_permit_access and GTF_sub_page is not set. |
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* |
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* In that case, the frame field has the same semantics as the |
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* field of the same name in the V1 entry structure. |
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*/ |
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struct { |
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struct grant_entry_header hdr; |
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uint32_t pad0; |
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uint64_t frame; |
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} full_page; |
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|
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/* |
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* If the grant type is GTF_grant_access and GTF_sub_page is set, |
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* @domid is allowed to access bytes [@page_off,@page_off+@length) |
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* in frame @frame. |
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*/ |
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struct { |
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struct grant_entry_header hdr; |
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uint16_t page_off; |
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uint16_t length; |
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uint64_t frame; |
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} sub_page; |
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/* |
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* If the grant is GTF_transitive, @domid is allowed to use the |
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* grant @gref in domain @trans_domid, as if it was the local |
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* domain. Obviously, the transitive access must be compatible |
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* with the original grant. |
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*/ |
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struct { |
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struct grant_entry_header hdr; |
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domid_t trans_domid; |
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uint16_t pad0; |
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grant_ref_t gref; |
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} transitive; |
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|
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uint32_t __spacer[4]; /* Pad to a power of two */ |
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}; |
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typedef uint16_t grant_status_t; |
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/*********************************** |
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* GRANT TABLE QUERIES AND USES |
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*/ |
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/* |
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* Handle to track a mapping created via a grant reference. |
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*/ |
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typedef uint32_t grant_handle_t; |
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|
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/* |
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* GNTTABOP_map_grant_ref: Map the grant entry (<dom>,<ref>) for access |
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* by devices and/or host CPUs. If successful, <handle> is a tracking number |
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* that must be presented later to destroy the mapping(s). On error, <handle> |
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* is a negative status code. |
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* NOTES: |
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* 1. If GNTMAP_device_map is specified then <dev_bus_addr> is the address |
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* via which I/O devices may access the granted frame. |
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* 2. If GNTMAP_host_map is specified then a mapping will be added at |
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* either a host virtual address in the current address space, or at |
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* a PTE at the specified machine address. The type of mapping to |
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* perform is selected through the GNTMAP_contains_pte flag, and the |
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* address is specified in <host_addr>. |
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* 3. Mappings should only be destroyed via GNTTABOP_unmap_grant_ref. If a |
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* host mapping is destroyed by other means then it is *NOT* guaranteed |
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* to be accounted to the correct grant reference! |
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*/ |
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#define GNTTABOP_map_grant_ref 0 |
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struct gnttab_map_grant_ref { |
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/* IN parameters. */ |
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uint64_t host_addr; |
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uint32_t flags; /* GNTMAP_* */ |
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grant_ref_t ref; |
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domid_t dom; |
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/* OUT parameters. */ |
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int16_t status; /* GNTST_* */ |
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grant_handle_t handle; |
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uint64_t dev_bus_addr; |
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}; |
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DEFINE_GUEST_HANDLE_STRUCT(gnttab_map_grant_ref); |
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|
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/* |
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* GNTTABOP_unmap_grant_ref: Destroy one or more grant-reference mappings |
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* tracked by <handle>. If <host_addr> or <dev_bus_addr> is zero, that |
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* field is ignored. If non-zero, they must refer to a device/host mapping |
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* that is tracked by <handle> |
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* NOTES: |
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* 1. The call may fail in an undefined manner if either mapping is not |
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* tracked by <handle>. |
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* 3. After executing a batch of unmaps, it is guaranteed that no stale |
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* mappings will remain in the device or host TLBs. |
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*/ |
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#define GNTTABOP_unmap_grant_ref 1 |
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struct gnttab_unmap_grant_ref { |
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/* IN parameters. */ |
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uint64_t host_addr; |
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uint64_t dev_bus_addr; |
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grant_handle_t handle; |
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/* OUT parameters. */ |
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int16_t status; /* GNTST_* */ |
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}; |
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DEFINE_GUEST_HANDLE_STRUCT(gnttab_unmap_grant_ref); |
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|
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/* |
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* GNTTABOP_setup_table: Set up a grant table for <dom> comprising at least |
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* <nr_frames> pages. The frame addresses are written to the <frame_list>. |
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* Only <nr_frames> addresses are written, even if the table is larger. |
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* NOTES: |
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* 1. <dom> may be specified as DOMID_SELF. |
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* 2. Only a sufficiently-privileged domain may specify <dom> != DOMID_SELF. |
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* 3. Xen may not support more than a single grant-table page per domain. |
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*/ |
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#define GNTTABOP_setup_table 2 |
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struct gnttab_setup_table { |
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/* IN parameters. */ |
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domid_t dom; |
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uint32_t nr_frames; |
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/* OUT parameters. */ |
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int16_t status; /* GNTST_* */ |
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GUEST_HANDLE(xen_pfn_t) frame_list; |
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}; |
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DEFINE_GUEST_HANDLE_STRUCT(gnttab_setup_table); |
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|
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/* |
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* GNTTABOP_dump_table: Dump the contents of the grant table to the |
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* xen console. Debugging use only. |
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*/ |
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#define GNTTABOP_dump_table 3 |
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struct gnttab_dump_table { |
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/* IN parameters. */ |
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domid_t dom; |
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/* OUT parameters. */ |
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int16_t status; /* GNTST_* */ |
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}; |
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DEFINE_GUEST_HANDLE_STRUCT(gnttab_dump_table); |
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|
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/* |
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* GNTTABOP_transfer_grant_ref: Transfer <frame> to a foreign domain. The |
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* foreign domain has previously registered its interest in the transfer via |
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* <domid, ref>. |
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* |
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* Note that, even if the transfer fails, the specified page no longer belongs |
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* to the calling domain *unless* the error is GNTST_bad_page. |
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*/ |
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#define GNTTABOP_transfer 4 |
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struct gnttab_transfer { |
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/* IN parameters. */ |
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xen_pfn_t mfn; |
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domid_t domid; |
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grant_ref_t ref; |
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/* OUT parameters. */ |
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int16_t status; |
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}; |
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DEFINE_GUEST_HANDLE_STRUCT(gnttab_transfer); |
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|
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/* |
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* GNTTABOP_copy: Hypervisor based copy |
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* source and destinations can be eithers MFNs or, for foreign domains, |
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* grant references. the foreign domain has to grant read/write access |
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* in its grant table. |
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* |
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* The flags specify what type source and destinations are (either MFN |
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* or grant reference). |
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* |
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* Note that this can also be used to copy data between two domains |
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* via a third party if the source and destination domains had previously |
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* grant appropriate access to their pages to the third party. |
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* |
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* source_offset specifies an offset in the source frame, dest_offset |
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* the offset in the target frame and len specifies the number of |
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* bytes to be copied. |
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*/ |
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#define _GNTCOPY_source_gref (0) |
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#define GNTCOPY_source_gref (1<<_GNTCOPY_source_gref) |
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#define _GNTCOPY_dest_gref (1) |
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#define GNTCOPY_dest_gref (1<<_GNTCOPY_dest_gref) |
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#define GNTTABOP_copy 5 |
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struct gnttab_copy { |
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/* IN parameters. */ |
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struct { |
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union { |
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grant_ref_t ref; |
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xen_pfn_t gmfn; |
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} u; |
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domid_t domid; |
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uint16_t offset; |
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} source, dest; |
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uint16_t len; |
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uint16_t flags; /* GNTCOPY_* */ |
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/* OUT parameters. */ |
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int16_t status; |
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}; |
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DEFINE_GUEST_HANDLE_STRUCT(gnttab_copy); |
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|
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/* |
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* GNTTABOP_query_size: Query the current and maximum sizes of the shared |
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* grant table. |
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* NOTES: |
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* 1. <dom> may be specified as DOMID_SELF. |
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* 2. Only a sufficiently-privileged domain may specify <dom> != DOMID_SELF. |
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*/ |
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#define GNTTABOP_query_size 6 |
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struct gnttab_query_size { |
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/* IN parameters. */ |
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domid_t dom; |
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/* OUT parameters. */ |
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uint32_t nr_frames; |
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uint32_t max_nr_frames; |
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int16_t status; /* GNTST_* */ |
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}; |
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DEFINE_GUEST_HANDLE_STRUCT(gnttab_query_size); |
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|
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/* |
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* GNTTABOP_unmap_and_replace: Destroy one or more grant-reference mappings |
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* tracked by <handle> but atomically replace the page table entry with one |
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* pointing to the machine address under <new_addr>. <new_addr> will be |
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* redirected to the null entry. |
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* NOTES: |
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* 1. The call may fail in an undefined manner if either mapping is not |
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* tracked by <handle>. |
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* 2. After executing a batch of unmaps, it is guaranteed that no stale |
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* mappings will remain in the device or host TLBs. |
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*/ |
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#define GNTTABOP_unmap_and_replace 7 |
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struct gnttab_unmap_and_replace { |
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/* IN parameters. */ |
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uint64_t host_addr; |
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uint64_t new_addr; |
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grant_handle_t handle; |
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/* OUT parameters. */ |
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int16_t status; /* GNTST_* */ |
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}; |
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DEFINE_GUEST_HANDLE_STRUCT(gnttab_unmap_and_replace); |
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|
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/* |
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* GNTTABOP_set_version: Request a particular version of the grant |
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* table shared table structure. This operation can only be performed |
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* once in any given domain. It must be performed before any grants |
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* are activated; otherwise, the domain will be stuck with version 1. |
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* The only defined versions are 1 and 2. |
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*/ |
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#define GNTTABOP_set_version 8 |
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struct gnttab_set_version { |
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/* IN parameters */ |
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uint32_t version; |
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}; |
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DEFINE_GUEST_HANDLE_STRUCT(gnttab_set_version); |
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|
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/* |
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* GNTTABOP_get_status_frames: Get the list of frames used to store grant |
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* status for <dom>. In grant format version 2, the status is separated |
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* from the other shared grant fields to allow more efficient synchronization |
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* using barriers instead of atomic cmpexch operations. |
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* <nr_frames> specify the size of vector <frame_list>. |
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* The frame addresses are returned in the <frame_list>. |
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* Only <nr_frames> addresses are returned, even if the table is larger. |
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* NOTES: |
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* 1. <dom> may be specified as DOMID_SELF. |
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* 2. Only a sufficiently-privileged domain may specify <dom> != DOMID_SELF. |
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*/ |
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#define GNTTABOP_get_status_frames 9 |
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struct gnttab_get_status_frames { |
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/* IN parameters. */ |
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uint32_t nr_frames; |
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domid_t dom; |
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/* OUT parameters. */ |
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int16_t status; /* GNTST_* */ |
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GUEST_HANDLE(uint64_t) frame_list; |
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}; |
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DEFINE_GUEST_HANDLE_STRUCT(gnttab_get_status_frames); |
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|
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/* |
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* GNTTABOP_get_version: Get the grant table version which is in |
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* effect for domain <dom>. |
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*/ |
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#define GNTTABOP_get_version 10 |
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struct gnttab_get_version { |
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/* IN parameters */ |
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domid_t dom; |
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uint16_t pad; |
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/* OUT parameters */ |
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uint32_t version; |
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}; |
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DEFINE_GUEST_HANDLE_STRUCT(gnttab_get_version); |
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|
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/* |
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* Issue one or more cache maintenance operations on a portion of a |
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* page granted to the calling domain by a foreign domain. |
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*/ |
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#define GNTTABOP_cache_flush 12 |
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struct gnttab_cache_flush { |
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union { |
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uint64_t dev_bus_addr; |
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grant_ref_t ref; |
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} a; |
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uint16_t offset; /* offset from start of grant */ |
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uint16_t length; /* size within the grant */ |
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#define GNTTAB_CACHE_CLEAN (1<<0) |
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#define GNTTAB_CACHE_INVAL (1<<1) |
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#define GNTTAB_CACHE_SOURCE_GREF (1<<31) |
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uint32_t op; |
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}; |
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DEFINE_GUEST_HANDLE_STRUCT(gnttab_cache_flush); |
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|
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/* |
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* Bitfield values for update_pin_status.flags. |
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*/ |
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/* Map the grant entry for access by I/O devices. */ |
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#define _GNTMAP_device_map (0) |
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#define GNTMAP_device_map (1<<_GNTMAP_device_map) |
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/* Map the grant entry for access by host CPUs. */ |
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#define _GNTMAP_host_map (1) |
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#define GNTMAP_host_map (1<<_GNTMAP_host_map) |
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/* Accesses to the granted frame will be restricted to read-only access. */ |
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#define _GNTMAP_readonly (2) |
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#define GNTMAP_readonly (1<<_GNTMAP_readonly) |
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/* |
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* GNTMAP_host_map subflag: |
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* 0 => The host mapping is usable only by the guest OS. |
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* 1 => The host mapping is usable by guest OS + current application. |
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*/ |
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#define _GNTMAP_application_map (3) |
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#define GNTMAP_application_map (1<<_GNTMAP_application_map) |
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|
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/* |
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* GNTMAP_contains_pte subflag: |
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* 0 => This map request contains a host virtual address. |
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* 1 => This map request contains the machine addess of the PTE to update. |
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*/ |
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#define _GNTMAP_contains_pte (4) |
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#define GNTMAP_contains_pte (1<<_GNTMAP_contains_pte) |
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/* |
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* Bits to be placed in guest kernel available PTE bits (architecture |
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* dependent; only supported when XENFEAT_gnttab_map_avail_bits is set). |
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*/ |
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#define _GNTMAP_guest_avail0 (16) |
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#define GNTMAP_guest_avail_mask ((uint32_t)~0 << _GNTMAP_guest_avail0) |
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/* |
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* Values for error status returns. All errors are -ve. |
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*/ |
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#define GNTST_okay (0) /* Normal return. */ |
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#define GNTST_general_error (-1) /* General undefined error. */ |
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#define GNTST_bad_domain (-2) /* Unrecognsed domain id. */ |
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#define GNTST_bad_gntref (-3) /* Unrecognised or inappropriate gntref. */ |
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#define GNTST_bad_handle (-4) /* Unrecognised or inappropriate handle. */ |
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#define GNTST_bad_virt_addr (-5) /* Inappropriate virtual address to map. */ |
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#define GNTST_bad_dev_addr (-6) /* Inappropriate device address to unmap.*/ |
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#define GNTST_no_device_space (-7) /* Out of space in I/O MMU. */ |
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#define GNTST_permission_denied (-8) /* Not enough privilege for operation. */ |
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#define GNTST_bad_page (-9) /* Specified page was invalid for op. */ |
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#define GNTST_bad_copy_arg (-10) /* copy arguments cross page boundary. */ |
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#define GNTST_address_too_big (-11) /* transfer page address too large. */ |
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#define GNTST_eagain (-12) /* Operation not done; try again. */ |
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#define GNTTABOP_error_msgs { \ |
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"okay", \ |
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"undefined error", \ |
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"unrecognised domain id", \ |
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"invalid grant reference", \ |
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"invalid mapping handle", \ |
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"invalid virtual address", \ |
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"invalid device address", \ |
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"no spare translation slot in the I/O MMU", \ |
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"permission denied", \ |
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"bad page", \ |
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"copy arguments cross page boundary", \ |
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"page address size too large", \ |
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"operation not done; try again" \ |
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} |
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#endif /* __XEN_PUBLIC_GRANT_TABLE_H__ */
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