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208 lines
8.1 KiB
C
208 lines
8.1 KiB
C
/* SPDX-License-Identifier: MIT
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*
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* xen.h
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*
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* Guest OS interface to Xen.
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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_XEN_H__
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#define __XEN_PUBLIC_XEN_H__
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#include <xen/arm/interface.h>
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/*
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* XEN "SYSTEM CALLS" (a.k.a. HYPERCALLS).
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*/
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/*
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* x86_32: EAX = vector; EBX, ECX, EDX, ESI, EDI = args 1, 2, 3, 4, 5.
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* EAX = return value
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* (argument registers may be clobbered on return)
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* x86_64: RAX = vector; RDI, RSI, RDX, R10, R8, R9 = args 1, 2, 3, 4, 5, 6.
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* RAX = return value
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* (argument registers not clobbered on return; RCX, R11 are)
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*/
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#define __HYPERVISOR_set_trap_table 0
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#define __HYPERVISOR_mmu_update 1
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#define __HYPERVISOR_set_gdt 2
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#define __HYPERVISOR_stack_switch 3
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#define __HYPERVISOR_set_callbacks 4
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#define __HYPERVISOR_fpu_taskswitch 5
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#define __HYPERVISOR_sched_op_compat 6
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#define __HYPERVISOR_platform_op 7
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#define __HYPERVISOR_set_debugreg 8
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#define __HYPERVISOR_get_debugreg 9
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#define __HYPERVISOR_update_descriptor 10
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#define __HYPERVISOR_memory_op 12
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#define __HYPERVISOR_multicall 13
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#define __HYPERVISOR_update_va_mapping 14
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#define __HYPERVISOR_set_timer_op 15
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#define __HYPERVISOR_event_channel_op_compat 16
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#define __HYPERVISOR_xen_version 17
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#define __HYPERVISOR_console_io 18
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#define __HYPERVISOR_physdev_op_compat 19
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#define __HYPERVISOR_grant_table_op 20
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#define __HYPERVISOR_vm_assist 21
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#define __HYPERVISOR_update_va_mapping_otherdomain 22
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#define __HYPERVISOR_iret 23 /* x86 only */
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#define __HYPERVISOR_vcpu_op 24
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#define __HYPERVISOR_set_segment_base 25 /* x86/64 only */
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#define __HYPERVISOR_mmuext_op 26
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#define __HYPERVISOR_xsm_op 27
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#define __HYPERVISOR_nmi_op 28
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#define __HYPERVISOR_sched_op 29
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#define __HYPERVISOR_callback_op 30
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#define __HYPERVISOR_xenoprof_op 31
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#define __HYPERVISOR_event_channel_op 32
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#define __HYPERVISOR_physdev_op 33
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#define __HYPERVISOR_hvm_op 34
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#define __HYPERVISOR_sysctl 35
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#define __HYPERVISOR_domctl 36
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#define __HYPERVISOR_kexec_op 37
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#define __HYPERVISOR_tmem_op 38
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#define __HYPERVISOR_xc_reserved_op 39 /* reserved for XenClient */
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#define __HYPERVISOR_xenpmu_op 40
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#define __HYPERVISOR_dm_op 41
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/* Architecture-specific hypercall definitions. */
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#define __HYPERVISOR_arch_0 48
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#define __HYPERVISOR_arch_1 49
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#define __HYPERVISOR_arch_2 50
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#define __HYPERVISOR_arch_3 51
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#define __HYPERVISOR_arch_4 52
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#define __HYPERVISOR_arch_5 53
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#define __HYPERVISOR_arch_6 54
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#define __HYPERVISOR_arch_7 55
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#ifndef __ASSEMBLY__
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typedef u16 domid_t;
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/* Domain ids >= DOMID_FIRST_RESERVED cannot be used for ordinary domains. */
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#define DOMID_FIRST_RESERVED (0x7FF0U)
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/* DOMID_SELF is used in certain contexts to refer to oneself. */
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#define DOMID_SELF (0x7FF0U)
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/*
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* DOMID_IO is used to restrict page-table updates to mapping I/O memory.
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* Although no Foreign Domain need be specified to map I/O pages, DOMID_IO
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* is useful to ensure that no mappings to the OS's own heap are accidentally
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* installed. (e.g., in Linux this could cause havoc as reference counts
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* aren't adjusted on the I/O-mapping code path).
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* This only makes sense in MMUEXT_SET_FOREIGNDOM, but in that context can
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* be specified by any calling domain.
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*/
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#define DOMID_IO (0x7FF1U)
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/*
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* DOMID_XEN is used to allow privileged domains to map restricted parts of
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* Xen's heap space (e.g., the machine_to_phys table).
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* This only makes sense in MMUEXT_SET_FOREIGNDOM, and is only permitted if
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* the caller is privileged.
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*/
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#define DOMID_XEN (0x7FF2U)
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/* DOMID_COW is used as the owner of sharable pages */
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#define DOMID_COW (0x7FF3U)
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/* DOMID_INVALID is used to identify pages with unknown owner. */
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#define DOMID_INVALID (0x7FF4U)
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/* Idle domain. */
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#define DOMID_IDLE (0x7FFFU)
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struct vcpu_info {
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/*
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* 'evtchn_upcall_pending' is written non-zero by Xen to indicate
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* a pending notification for a particular VCPU. It is then cleared
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* by the guest OS /before/ checking for pending work, thus avoiding
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* a set-and-check race. Note that the mask is only accessed by Xen
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* on the CPU that is currently hosting the VCPU. This means that the
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* pending and mask flags can be updated by the guest without special
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* synchronisation (i.e., no need for the x86 LOCK prefix).
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* This may seem suboptimal because if the pending flag is set by
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* a different CPU then an IPI may be scheduled even when the mask
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* is set. However, note:
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* 1. The task of 'interrupt holdoff' is covered by the per-event-
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* channel mask bits. A 'noisy' event that is continually being
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* triggered can be masked at source at this very precise
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* granularity.
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* 2. The main purpose of the per-VCPU mask is therefore to restrict
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* reentrant execution: whether for concurrency control, or to
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* prevent unbounded stack usage. Whatever the purpose, we expect
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* that the mask will be asserted only for short periods at a time,
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* and so the likelihood of a 'spurious' IPI is suitably small.
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* The mask is read before making an event upcall to the guest: a
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* non-zero mask therefore guarantees that the VCPU will not receive
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* an upcall activation. The mask is cleared when the VCPU requests
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* to block: this avoids wakeup-waiting races.
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*/
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u8 evtchn_upcall_pending;
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u8 evtchn_upcall_mask;
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xen_ulong_t evtchn_pending_sel;
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struct arch_vcpu_info arch;
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struct pvclock_vcpu_time_info time;
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}; /* 64 bytes (x86) */
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/*
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* Xen/kernel shared data -- pointer provided in start_info.
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* NB. We expect that this struct is smaller than a page.
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*/
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struct shared_info {
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struct vcpu_info vcpu_info[MAX_VIRT_CPUS];
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/*
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* A domain can create "event channels" on which it can send and receive
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* asynchronous event notifications. There are three classes of event that
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* are delivered by this mechanism:
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* 1. Bi-directional inter- and intra-domain connections. Domains must
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* arrange out-of-band to set up a connection (usually by allocating
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* an unbound 'listener' port and avertising that via a storage service
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* such as xenstore).
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* 2. Physical interrupts. A domain with suitable hardware-access
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* privileges can bind an event-channel port to a physical interrupt
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* source.
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* 3. Virtual interrupts ('events'). A domain can bind an event-channel
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* port to a virtual interrupt source, such as the virtual-timer
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* device or the emergency console.
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*
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* Event channels are addressed by a "port index". Each channel is
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* associated with two bits of information:
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* 1. PENDING -- notifies the domain that there is a pending notification
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* to be processed. This bit is cleared by the guest.
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* 2. MASK -- if this bit is clear then a 0->1 transition of PENDING
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* will cause an asynchronous upcall to be scheduled. This bit is only
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* updated by the guest. It is read-only within Xen. If a channel
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* becomes pending while the channel is masked then the 'edge' is lost
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* (i.e., when the channel is unmasked, the guest must manually handle
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* pending notifications as no upcall will be scheduled by Xen).
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*
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* To expedite scanning of pending notifications, any 0->1 pending
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* transition on an unmasked channel causes a corresponding bit in a
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* per-vcpu selector word to be set. Each bit in the selector covers a
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* 'C long' in the PENDING bitfield array.
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*/
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xen_ulong_t evtchn_pending[sizeof(xen_ulong_t) * 8];
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xen_ulong_t evtchn_mask[sizeof(xen_ulong_t) * 8];
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/*
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* Wallclock time: updated only by control software. Guests should base
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* their gettimeofday() syscall on this wallclock-base value.
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*/
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struct pvclock_wall_clock wc;
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struct arch_shared_info arch;
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};
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#else /* __ASSEMBLY__ */
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/* In assembly code we cannot use C numeric constant suffixes. */
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#define mk_unsigned_long(x) x
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#endif /* !__ASSEMBLY__ */
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#endif /* __XEN_PUBLIC_XEN_H__ */
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