FreeBSD/Linux Kernel Cross Reference
sys/xen/interface/hvm/dm_op.h

     /*
      * Copyright (c) 2016, Citrix Systems Inc
      *
      * 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.
     *
     */
    
    #ifndef __XEN_PUBLIC_HVM_DM_OP_H__
    #define __XEN_PUBLIC_HVM_DM_OP_H__
    
    #include "../xen.h"
    
    #if defined(__XEN__) || defined(__XEN_TOOLS__)
    
    #include "../event_channel.h"
    
    #ifndef uint64_aligned_t
    #define uint64_aligned_t uint64_t
    #endif
    
    /*
     * IOREQ Servers
     *
     * The interface between an I/O emulator an Xen is called an IOREQ Server.
     * A domain supports a single 'legacy' IOREQ Server which is instantiated if
     * parameter...
     *
     * HVM_PARAM_IOREQ_PFN is read (to get the gfn containing the synchronous
     * ioreq structures), or...
     * HVM_PARAM_BUFIOREQ_PFN is read (to get the gfn containing the buffered
     * ioreq ring), or...
     * HVM_PARAM_BUFIOREQ_EVTCHN is read (to get the event channel that Xen uses
     * to request buffered I/O emulation).
     *
     * The following hypercalls facilitate the creation of IOREQ Servers for
     * 'secondary' emulators which are invoked to implement port I/O, memory, or
     * PCI config space ranges which they explicitly register.
     */
    
    typedef uint16_t ioservid_t;
    
    /*
     * XEN_DMOP_create_ioreq_server: Instantiate a new IOREQ Server for a
     *                               secondary emulator.
     *
     * The <id> handed back is unique for target domain. The valur of
     * <handle_bufioreq> should be one of HVM_IOREQSRV_BUFIOREQ_* defined in
     * hvm_op.h. If the value is HVM_IOREQSRV_BUFIOREQ_OFF then  the buffered
     * ioreq ring will not be allocated and hence all emulation requests to
     * this server will be synchronous.
     */
    #define XEN_DMOP_create_ioreq_server 1
    
    struct xen_dm_op_create_ioreq_server {
        /* IN - should server handle buffered ioreqs */
        uint8_t handle_bufioreq;
        uint8_t pad[3];
        /* OUT - server id */
        ioservid_t id;
    };
    
    /*
     * XEN_DMOP_get_ioreq_server_info: Get all the information necessary to
     *                                 access IOREQ Server <id>.
     *
     * If the IOREQ Server is handling buffered emulation requests, the
     * emulator needs to bind to event channel <bufioreq_port> to listen for
     * them. (The event channels used for synchronous emulation requests are
     * specified in the per-CPU ioreq structures).
     * In addition, if the XENMEM_acquire_resource memory op cannot be used,
     * the emulator will need to map the synchronous ioreq structures and
     * buffered ioreq ring (if it exists) from guest memory. If <flags> does
     * not contain XEN_DMOP_no_gfns then these pages will be made available and
     * the frame numbers passed back in gfns <ioreq_gfn> and <bufioreq_gfn>
     * respectively. (If the IOREQ Server is not handling buffered emulation
     * only <ioreq_gfn> will be valid).
     *
     * NOTE: To access the synchronous ioreq structures and buffered ioreq
     *       ring, it is preferable to use the XENMEM_acquire_resource memory
     *       op specifying resource type XENMEM_resource_ioreq_server.
     */
    #define XEN_DMOP_get_ioreq_server_info 2
    
   struct xen_dm_op_get_ioreq_server_info {
       /* IN - server id */
       ioservid_t id;
       /* IN - flags */
       uint16_t flags;
   
   #define _XEN_DMOP_no_gfns 0
   #define XEN_DMOP_no_gfns (1u << _XEN_DMOP_no_gfns)
   
       /* OUT - buffered ioreq port */
       evtchn_port_t bufioreq_port;
       /* OUT - sync ioreq gfn (see block comment above) */
       uint64_aligned_t ioreq_gfn;
       /* OUT - buffered ioreq gfn (see block comment above)*/
       uint64_aligned_t bufioreq_gfn;
   };
   
   /*
    * XEN_DMOP_map_io_range_to_ioreq_server: Register an I/O range for
    *                                        emulation by the client of
    *                                        IOREQ Server <id>.
    * XEN_DMOP_unmap_io_range_from_ioreq_server: Deregister an I/O range
    *                                            previously registered for
    *                                            emulation by the client of
    *                                            IOREQ Server <id>.
    *
    * There are three types of I/O that can be emulated: port I/O, memory
    * accesses and PCI config space accesses. The <type> field denotes which
    * type of range* the <start> and <end> (inclusive) fields are specifying.
    * PCI config space ranges are specified by segment/bus/device/function
    * values which should be encoded using the DMOP_PCI_SBDF helper macro
    * below.
    *
    * NOTE: unless an emulation request falls entirely within a range mapped
    * by a secondary emulator, it will not be passed to that emulator.
    */
   #define XEN_DMOP_map_io_range_to_ioreq_server 3
   #define XEN_DMOP_unmap_io_range_from_ioreq_server 4
   
   struct xen_dm_op_ioreq_server_range {
       /* IN - server id */
       ioservid_t id;
       uint16_t pad;
       /* IN - type of range */
       uint32_t type;
   # define XEN_DMOP_IO_RANGE_PORT   0 /* I/O port range */
   # define XEN_DMOP_IO_RANGE_MEMORY 1 /* MMIO range */
   # define XEN_DMOP_IO_RANGE_PCI    2 /* PCI segment/bus/dev/func range */
       /* IN - inclusive start and end of range */
       uint64_aligned_t start, end;
   };
   
   #define XEN_DMOP_PCI_SBDF(s,b,d,f) \
           ((((s) & 0xffff) << 16) |  \
            (((b) & 0xff) << 8) |     \
            (((d) & 0x1f) << 3) |     \
            ((f) & 0x07))
   
   /*
    * XEN_DMOP_set_ioreq_server_state: Enable or disable the IOREQ Server <id>
    *
    * The IOREQ Server will not be passed any emulation requests until it is
    * in the enabled state.
    * Note that the contents of the ioreq_gfn and bufioreq_gfn (see
    * XEN_DMOP_get_ioreq_server_info) are not meaningful until the IOREQ Server
    * is in the enabled state.
    */
   #define XEN_DMOP_set_ioreq_server_state 5
   
   struct xen_dm_op_set_ioreq_server_state {
       /* IN - server id */
       ioservid_t id;
       /* IN - enabled? */
       uint8_t enabled;
       uint8_t pad;
   };
   
   /*
    * XEN_DMOP_destroy_ioreq_server: Destroy the IOREQ Server <id>.
    *
    * Any registered I/O ranges will be automatically deregistered.
    */
   #define XEN_DMOP_destroy_ioreq_server 6
   
   struct xen_dm_op_destroy_ioreq_server {
       /* IN - server id */
       ioservid_t id;
       uint16_t pad;
   };
   
   /*
    * XEN_DMOP_track_dirty_vram: Track modifications to the specified pfn
    *                            range.
    *
    * NOTE: The bitmap passed back to the caller is passed in a
    *       secondary buffer.
    */
   #define XEN_DMOP_track_dirty_vram 7
   
   struct xen_dm_op_track_dirty_vram {
       /* IN - number of pages to be tracked */
       uint32_t nr;
       uint32_t pad;
       /* IN - first pfn to track */
       uint64_aligned_t first_pfn;
   };
   
   /*
    * XEN_DMOP_set_pci_intx_level: Set the logical level of one of a domain's
    *                              PCI INTx pins.
    */
   #define XEN_DMOP_set_pci_intx_level 8
   
   struct xen_dm_op_set_pci_intx_level {
       /* IN - PCI INTx identification (domain:bus:device:intx) */
       uint16_t domain;
       uint8_t bus, device, intx;
       /* IN - Level: 0 -> deasserted, 1 -> asserted */
       uint8_t  level;
   };
   
   /*
    * XEN_DMOP_set_isa_irq_level: Set the logical level of a one of a domain's
    *                             ISA IRQ lines.
    */
   #define XEN_DMOP_set_isa_irq_level 9
   
   struct xen_dm_op_set_isa_irq_level {
       /* IN - ISA IRQ (0-15) */
       uint8_t  isa_irq;
       /* IN - Level: 0 -> deasserted, 1 -> asserted */
       uint8_t  level;
   };
   
   /*
    * XEN_DMOP_set_pci_link_route: Map a PCI INTx line to an IRQ line.
    */
   #define XEN_DMOP_set_pci_link_route 10
   
   struct xen_dm_op_set_pci_link_route {
       /* PCI INTx line (0-3) */
       uint8_t  link;
       /* ISA IRQ (1-15) or 0 -> disable link */
       uint8_t  isa_irq;
   };
   
   /*
    * XEN_DMOP_modified_memory: Notify that a set of pages were modified by
    *                           an emulator.
    *
    * DMOP buf 1 contains an array of xen_dm_op_modified_memory_extent with
    * @nr_extents entries.
    *
    * On error, @nr_extents will contain the index+1 of the extent that
    * had the error.  It is not defined if or which pages may have been
    * marked as dirty, in this event.
    */
   #define XEN_DMOP_modified_memory 11
   
   struct xen_dm_op_modified_memory {
       /*
        * IN - Number of extents to be processed
        * OUT -returns n+1 for failing extent
        */
       uint32_t nr_extents;
       /* IN/OUT - Must be set to 0 */
       uint32_t opaque;
   };
   
   struct xen_dm_op_modified_memory_extent {
       /* IN - number of contiguous pages modified */
       uint32_t nr;
       uint32_t pad;
       /* IN - first pfn modified */
       uint64_aligned_t first_pfn;
   };
   
   /*
    * XEN_DMOP_set_mem_type: Notify that a region of memory is to be treated
    *                        in a specific way. (See definition of
    *                        hvmmem_type_t).
    *
    * NOTE: In the event of a continuation (return code -ERESTART), the
    *       @first_pfn is set to the value of the pfn of the remaining
    *       region and @nr reduced to the size of the remaining region.
    */
   #define XEN_DMOP_set_mem_type 12
   
   struct xen_dm_op_set_mem_type {
       /* IN - number of contiguous pages */
       uint32_t nr;
       /* IN - new hvmmem_type_t of region */
       uint16_t mem_type;
       uint16_t pad;
       /* IN - first pfn in region */
       uint64_aligned_t first_pfn;
   };
   
   /*
    * XEN_DMOP_inject_event: Inject an event into a VCPU, which will
    *                        get taken up when it is next scheduled.
    *
    * Note that the caller should know enough of the state of the CPU before
    * injecting, to know what the effect of injecting the event will be.
    */
   #define XEN_DMOP_inject_event 13
   
   struct xen_dm_op_inject_event {
       /* IN - index of vCPU */
       uint32_t vcpuid;
       /* IN - interrupt vector */
       uint8_t vector;
       /* IN - event type (DMOP_EVENT_* ) */
       uint8_t type;
   /* NB. This enumeration precisely matches hvm.h:X86_EVENTTYPE_* */
   # define XEN_DMOP_EVENT_ext_int    0 /* external interrupt */
   # define XEN_DMOP_EVENT_nmi        2 /* nmi */
   # define XEN_DMOP_EVENT_hw_exc     3 /* hardware exception */
   # define XEN_DMOP_EVENT_sw_int     4 /* software interrupt (CD nn) */
   # define XEN_DMOP_EVENT_pri_sw_exc 5 /* ICEBP (F1) */
   # define XEN_DMOP_EVENT_sw_exc     6 /* INT3 (CC), INTO (CE) */
       /* IN - instruction length */
       uint8_t insn_len;
       uint8_t pad0;
       /* IN - error code (or ~0 to skip) */
       uint32_t error_code;
       uint32_t pad1;
       /* IN - type-specific extra data (%cr2 for #PF, pending_dbg for #DB) */
       uint64_aligned_t cr2;
   };
   
   /*
    * XEN_DMOP_inject_msi: Inject an MSI for an emulated device.
    */
   #define XEN_DMOP_inject_msi 14
   
   struct xen_dm_op_inject_msi {
       /* IN - MSI data (lower 32 bits) */
       uint32_t data;
       uint32_t pad;
       /* IN - MSI address (0xfeexxxxx) */
       uint64_aligned_t addr;
   };
   
   /*
    * XEN_DMOP_map_mem_type_to_ioreq_server : map or unmap the IOREQ Server <id>
    *                                      to specific memory type <type>
    *                                      for specific accesses <flags>
    *
    * For now, flags only accept the value of XEN_DMOP_IOREQ_MEM_ACCESS_WRITE,
    * which means only write operations are to be forwarded to an ioreq server.
    * Support for the emulation of read operations can be added when an ioreq
    * server has such requirement in future.
    */
   #define XEN_DMOP_map_mem_type_to_ioreq_server 15
   
   struct xen_dm_op_map_mem_type_to_ioreq_server {
       ioservid_t id;      /* IN - ioreq server id */
       uint16_t type;      /* IN - memory type */
       uint32_t flags;     /* IN - types of accesses to be forwarded to the
                              ioreq server. flags with 0 means to unmap the
                              ioreq server */
   
   #define XEN_DMOP_IOREQ_MEM_ACCESS_READ (1u << 0)
   #define XEN_DMOP_IOREQ_MEM_ACCESS_WRITE (1u << 1)
   
       uint64_t opaque;    /* IN/OUT - only used for hypercall continuation,
                              has to be set to zero by the caller */
   };
   
   /*
    * XEN_DMOP_remote_shutdown : Declare a shutdown for another domain
    *                            Identical to SCHEDOP_remote_shutdown
    */
   #define XEN_DMOP_remote_shutdown 16
   
   struct xen_dm_op_remote_shutdown {
       uint32_t reason;       /* SHUTDOWN_* => enum sched_shutdown_reason */
                              /* (Other reason values are not blocked) */
   };
   
   /*
    * XEN_DMOP_relocate_memory : Relocate GFNs for the specified guest.
    *                            Identical to XENMEM_add_to_physmap with
    *                            space == XENMAPSPACE_gmfn_range.
    */
   #define XEN_DMOP_relocate_memory 17
   
   struct xen_dm_op_relocate_memory {
       /* All fields are IN/OUT, with their OUT state undefined. */
       /* Number of GFNs to process. */
       uint32_t size;
       uint32_t pad;
       /* Starting GFN to relocate. */
       uint64_aligned_t src_gfn;
       /* Starting GFN where GFNs should be relocated. */
       uint64_aligned_t dst_gfn;
   };
   
   /*
    * XEN_DMOP_pin_memory_cacheattr : Pin caching type of RAM space.
    *                                 Identical to XEN_DOMCTL_pin_mem_cacheattr.
    */
   #define XEN_DMOP_pin_memory_cacheattr 18
   
   struct xen_dm_op_pin_memory_cacheattr {
       uint64_aligned_t start; /* Start gfn. */
       uint64_aligned_t end;   /* End gfn. */
   /* Caching types: these happen to be the same as x86 MTRR/PAT type codes. */
   #define XEN_DMOP_MEM_CACHEATTR_UC  0
   #define XEN_DMOP_MEM_CACHEATTR_WC  1
   #define XEN_DMOP_MEM_CACHEATTR_WT  4
   #define XEN_DMOP_MEM_CACHEATTR_WP  5
   #define XEN_DMOP_MEM_CACHEATTR_WB  6
   #define XEN_DMOP_MEM_CACHEATTR_UCM 7
   #define XEN_DMOP_DELETE_MEM_CACHEATTR (~(uint32_t)0)
       uint32_t type;          /* XEN_DMOP_MEM_CACHEATTR_* */
       uint32_t pad;
   };
   
   struct xen_dm_op {
       uint32_t op;
       uint32_t pad;
       union {
           struct xen_dm_op_create_ioreq_server create_ioreq_server;
           struct xen_dm_op_get_ioreq_server_info get_ioreq_server_info;
           struct xen_dm_op_ioreq_server_range map_io_range_to_ioreq_server;
           struct xen_dm_op_ioreq_server_range unmap_io_range_from_ioreq_server;
           struct xen_dm_op_set_ioreq_server_state set_ioreq_server_state;
           struct xen_dm_op_destroy_ioreq_server destroy_ioreq_server;
           struct xen_dm_op_track_dirty_vram track_dirty_vram;
           struct xen_dm_op_set_pci_intx_level set_pci_intx_level;
           struct xen_dm_op_set_isa_irq_level set_isa_irq_level;
           struct xen_dm_op_set_pci_link_route set_pci_link_route;
           struct xen_dm_op_modified_memory modified_memory;
           struct xen_dm_op_set_mem_type set_mem_type;
           struct xen_dm_op_inject_event inject_event;
           struct xen_dm_op_inject_msi inject_msi;
           struct xen_dm_op_map_mem_type_to_ioreq_server
                   map_mem_type_to_ioreq_server;
           struct xen_dm_op_remote_shutdown remote_shutdown;
           struct xen_dm_op_relocate_memory relocate_memory;
           struct xen_dm_op_pin_memory_cacheattr pin_memory_cacheattr;
       } u;
   };
   
   #endif /* __XEN__ || __XEN_TOOLS__ */
   
   struct xen_dm_op_buf {
       XEN_GUEST_HANDLE(void) h;
       xen_ulong_t size;
   };
   typedef struct xen_dm_op_buf xen_dm_op_buf_t;
   DEFINE_XEN_GUEST_HANDLE(xen_dm_op_buf_t);
   
   /* ` enum neg_errnoval
    * ` HYPERVISOR_dm_op(domid_t domid,
    * `                  unsigned int nr_bufs,
    * `                  xen_dm_op_buf_t bufs[])
    * `
    *
    * @domid is the domain the hypercall operates on.
    * @nr_bufs is the number of buffers in the @bufs array.
    * @bufs points to an array of buffers where @bufs[0] contains a struct
    * xen_dm_op, describing the specific device model operation and its
    * parameters.
    * @bufs[1..] may be referenced in the parameters for the purposes of
    * passing extra information to or from the domain.
    */
   
   #endif /* __XEN_PUBLIC_HVM_DM_OP_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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