207 lines
7.5 KiB
C
207 lines
7.5 KiB
C
/* SPDX-License-Identifier: MIT */
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/******************************************************************************
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* vcpu.h
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*
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* VCPU initialisation, query, and hotplug.
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*
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* Copyright (c) 2005, Keir Fraser <keir@xensource.com>
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*/
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#ifndef __XEN_PUBLIC_VCPU_H__
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#define __XEN_PUBLIC_VCPU_H__
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/*
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* Prototype for this hypercall is:
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* int vcpu_op(int cmd, int vcpuid, void *extra_args)
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* @cmd == VCPUOP_??? (VCPU operation).
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* @vcpuid == VCPU to operate on.
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* @extra_args == Operation-specific extra arguments (NULL if none).
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*/
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/*
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* Initialise a VCPU. Each VCPU can be initialised only once. A
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* newly-initialised VCPU will not run until it is brought up by VCPUOP_up.
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*
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* @extra_arg == pointer to vcpu_guest_context structure containing initial
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* state for the VCPU.
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*/
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#define VCPUOP_initialise 0
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/*
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* Bring up a VCPU. This makes the VCPU runnable. This operation will fail
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* if the VCPU has not been initialised (VCPUOP_initialise).
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*/
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#define VCPUOP_up 1
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/*
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* Bring down a VCPU (i.e., make it non-runnable).
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* There are a few caveats that callers should observe:
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* 1. This operation may return, and VCPU_is_up may return false, before the
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* VCPU stops running (i.e., the command is asynchronous). It is a good
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* idea to ensure that the VCPU has entered a non-critical loop before
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* bringing it down. Alternatively, this operation is guaranteed
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* synchronous if invoked by the VCPU itself.
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* 2. After a VCPU is initialised, there is currently no way to drop all its
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* references to domain memory. Even a VCPU that is down still holds
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* memory references via its pagetable base pointer and GDT. It is good
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* practise to move a VCPU onto an 'idle' or default page table, LDT and
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* GDT before bringing it down.
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*/
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#define VCPUOP_down 2
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/* Returns 1 if the given VCPU is up. */
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#define VCPUOP_is_up 3
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/*
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* Return information about the state and running time of a VCPU.
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* @extra_arg == pointer to vcpu_runstate_info structure.
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*/
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#define VCPUOP_get_runstate_info 4
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struct vcpu_runstate_info {
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/* VCPU's current state (RUNSTATE_*). */
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int state;
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/* When was current state entered (system time, ns)? */
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uint64_t state_entry_time;
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/*
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* Update indicator set in state_entry_time:
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* When activated via VMASST_TYPE_runstate_update_flag, set during
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* updates in guest memory mapped copy of vcpu_runstate_info.
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*/
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#define XEN_RUNSTATE_UPDATE (1ULL << 63)
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/*
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* Time spent in each RUNSTATE_* (ns). The sum of these times is
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* guaranteed not to drift from system time.
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*/
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uint64_t time[4];
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};
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DEFINE_GUEST_HANDLE_STRUCT(vcpu_runstate_info);
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/* VCPU is currently running on a physical CPU. */
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#define RUNSTATE_running 0
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/* VCPU is runnable, but not currently scheduled on any physical CPU. */
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#define RUNSTATE_runnable 1
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/* VCPU is blocked (a.k.a. idle). It is therefore not runnable. */
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#define RUNSTATE_blocked 2
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/*
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* VCPU is not runnable, but it is not blocked.
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* This is a 'catch all' state for things like hotplug and pauses by the
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* system administrator (or for critical sections in the hypervisor).
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* RUNSTATE_blocked dominates this state (it is the preferred state).
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*/
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#define RUNSTATE_offline 3
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/*
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* Register a shared memory area from which the guest may obtain its own
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* runstate information without needing to execute a hypercall.
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* Notes:
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* 1. The registered address may be virtual or physical, depending on the
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* platform. The virtual address should be registered on x86 systems.
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* 2. Only one shared area may be registered per VCPU. The shared area is
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* updated by the hypervisor each time the VCPU is scheduled. Thus
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* runstate.state will always be RUNSTATE_running and
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* runstate.state_entry_time will indicate the system time at which the
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* VCPU was last scheduled to run.
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* @extra_arg == pointer to vcpu_register_runstate_memory_area structure.
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*/
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#define VCPUOP_register_runstate_memory_area 5
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struct vcpu_register_runstate_memory_area {
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union {
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GUEST_HANDLE(vcpu_runstate_info) h;
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struct vcpu_runstate_info *v;
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uint64_t p;
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} addr;
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};
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/*
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* Set or stop a VCPU's periodic timer. Every VCPU has one periodic timer
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* which can be set via these commands. Periods smaller than one millisecond
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* may not be supported.
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*/
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#define VCPUOP_set_periodic_timer 6 /* arg == vcpu_set_periodic_timer_t */
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#define VCPUOP_stop_periodic_timer 7 /* arg == NULL */
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struct vcpu_set_periodic_timer {
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uint64_t period_ns;
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};
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DEFINE_GUEST_HANDLE_STRUCT(vcpu_set_periodic_timer);
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/*
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* Set or stop a VCPU's single-shot timer. Every VCPU has one single-shot
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* timer which can be set via these commands.
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*/
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#define VCPUOP_set_singleshot_timer 8 /* arg == vcpu_set_singleshot_timer_t */
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#define VCPUOP_stop_singleshot_timer 9 /* arg == NULL */
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struct vcpu_set_singleshot_timer {
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uint64_t timeout_abs_ns;
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uint32_t flags; /* VCPU_SSHOTTMR_??? */
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};
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DEFINE_GUEST_HANDLE_STRUCT(vcpu_set_singleshot_timer);
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/* Flags to VCPUOP_set_singleshot_timer. */
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/* Require the timeout to be in the future (return -ETIME if it's passed). */
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#define _VCPU_SSHOTTMR_future (0)
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#define VCPU_SSHOTTMR_future (1U << _VCPU_SSHOTTMR_future)
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/*
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* Register a memory location in the guest address space for the
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* vcpu_info structure. This allows the guest to place the vcpu_info
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* structure in a convenient place, such as in a per-cpu data area.
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* The pointer need not be page aligned, but the structure must not
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* cross a page boundary.
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*/
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#define VCPUOP_register_vcpu_info 10 /* arg == struct vcpu_info */
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struct vcpu_register_vcpu_info {
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uint64_t mfn; /* mfn of page to place vcpu_info */
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uint32_t offset; /* offset within page */
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uint32_t rsvd; /* unused */
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};
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DEFINE_GUEST_HANDLE_STRUCT(vcpu_register_vcpu_info);
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/* Send an NMI to the specified VCPU. @extra_arg == NULL. */
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#define VCPUOP_send_nmi 11
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/*
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* Get the physical ID information for a pinned vcpu's underlying physical
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* processor. The physical ID informmation is architecture-specific.
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* On x86: id[31:0]=apic_id, id[63:32]=acpi_id.
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* This command returns -EINVAL if it is not a valid operation for this VCPU.
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*/
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#define VCPUOP_get_physid 12 /* arg == vcpu_get_physid_t */
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struct vcpu_get_physid {
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uint64_t phys_id;
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};
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DEFINE_GUEST_HANDLE_STRUCT(vcpu_get_physid);
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#define xen_vcpu_physid_to_x86_apicid(physid) ((uint32_t)(physid))
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#define xen_vcpu_physid_to_x86_acpiid(physid) ((uint32_t)((physid) >> 32))
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/*
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* Register a memory location to get a secondary copy of the vcpu time
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* parameters. The master copy still exists as part of the vcpu shared
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* memory area, and this secondary copy is updated whenever the master copy
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* is updated (and using the same versioning scheme for synchronisation).
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*
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* The intent is that this copy may be mapped (RO) into userspace so
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* that usermode can compute system time using the time info and the
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* tsc. Usermode will see an array of vcpu_time_info structures, one
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* for each vcpu, and choose the right one by an existing mechanism
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* which allows it to get the current vcpu number (such as via a
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* segment limit). It can then apply the normal algorithm to compute
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* system time from the tsc.
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*
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* @extra_arg == pointer to vcpu_register_time_info_memory_area structure.
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*/
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#define VCPUOP_register_vcpu_time_memory_area 13
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DEFINE_GUEST_HANDLE_STRUCT(vcpu_time_info);
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struct vcpu_register_time_memory_area {
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union {
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GUEST_HANDLE(vcpu_time_info) h;
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struct pvclock_vcpu_time_info *v;
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uint64_t p;
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} addr;
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};
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DEFINE_GUEST_HANDLE_STRUCT(vcpu_register_time_memory_area);
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#endif /* __XEN_PUBLIC_VCPU_H__ */
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