2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright © 2008, 2013 Citrix Systems, Inc.
5 * Copyright © 2012 Spectra Logic Corporation
6 * Copyright © 2021 Elliott Mitchell
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include <sys/param.h> /* required by xen/xen-os.h */
39 #include <machine/atomic.h> /* required by xen/xen-os.h */
41 #include <xen/xen-os.h>
44 #include <contrib/xen/vcpu.h>
46 /*-------------------------------- Global Data -------------------------------*/
47 enum xen_domain_type xen_domain_type = XEN_NATIVE;
50 * Start info flags. ATM this only used to store the initial domain flag for
51 * PVHv2, and it's always empty for HVM guests.
53 uint32_t hvm_start_flags;
55 /*------------------ Hypervisor Access Shared Memory Regions -----------------*/
56 shared_info_t *HYPERVISOR_shared_info;
58 /*------------------------------- Per-CPU Data -------------------------------*/
59 DPCPU_DEFINE(struct vcpu_info *, vcpu_info);
62 xen_setup_vcpu_info(void)
64 /* This isn't directly accessed outside this function */
65 DPCPU_DEFINE_STATIC(vcpu_info_t, vcpu_local_info)
66 __attribute__((aligned(64)));
68 vcpu_info_t *vcpu_info = DPCPU_PTR(vcpu_local_info);
69 vcpu_register_vcpu_info_t info = {
70 .mfn = vtophys(vcpu_info) >> PAGE_SHIFT,
71 .offset = vtophys(vcpu_info) & PAGE_MASK,
73 unsigned int cpu = XEN_VCPUID();
76 KASSERT(xen_domain(), ("%s(): invoked when not on Xen?", __func__));
78 _Static_assert(sizeof(struct vcpu_info) <= 64,
79 "struct vcpu_info is larger than supported limit of 64 bytes");
84 * NB: the vCPU info for some vCPUs can be fetched from the shared info
85 * page, but in order to make sure the mapping code is correct always
86 * attempt to map the vCPU info at a custom place.
88 rc = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
90 DPCPU_SET(vcpu_info, vcpu_info);
91 else if (cpu < nitems(HYPERVISOR_shared_info->vcpu_info)) {
92 static bool warned = false;
94 DPCPU_SET(vcpu_info, &HYPERVISOR_shared_info->vcpu_info[cpu]);
96 if (bootverbose && !warned) {
99 "WARNING: Xen vCPU %u failed to setup vcpu_info rc = %d\n",
103 panic("Unable to register vCPU %u, rc=%d\n", cpu, rc);