16d765bffSElliott Mitchell /*-
24d846d26SWarner Losh * SPDX-License-Identifier: BSD-2-Clause
36d765bffSElliott Mitchell *
46d765bffSElliott Mitchell * Copyright © 2008, 2013 Citrix Systems, Inc.
56d765bffSElliott Mitchell * Copyright © 2012 Spectra Logic Corporation
66d765bffSElliott Mitchell * Copyright © 2021 Elliott Mitchell
76d765bffSElliott Mitchell * All rights reserved.
86d765bffSElliott Mitchell *
96d765bffSElliott Mitchell * Redistribution and use in source and binary forms, with or without
106d765bffSElliott Mitchell * modification, are permitted provided that the following conditions
116d765bffSElliott Mitchell * are met:
126d765bffSElliott Mitchell * 1. Redistributions of source code must retain the above copyright
136d765bffSElliott Mitchell * notice, this list of conditions and the following disclaimer.
146d765bffSElliott Mitchell * 2. Redistributions in binary form must reproduce the above copyright
156d765bffSElliott Mitchell * notice, this list of conditions and the following disclaimer in the
166d765bffSElliott Mitchell * documentation and/or other materials provided with the distribution.
176d765bffSElliott Mitchell *
186d765bffSElliott Mitchell * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
196d765bffSElliott Mitchell * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
206d765bffSElliott Mitchell * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
216d765bffSElliott Mitchell * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
226d765bffSElliott Mitchell * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
236d765bffSElliott Mitchell * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
246d765bffSElliott Mitchell * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
256d765bffSElliott Mitchell * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
266d765bffSElliott Mitchell * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
276d765bffSElliott Mitchell * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
286d765bffSElliott Mitchell * SUCH DAMAGE.
296d765bffSElliott Mitchell */
306d765bffSElliott Mitchell
316d765bffSElliott Mitchell #include <sys/param.h> /* required by xen/xen-os.h */
326d765bffSElliott Mitchell
33*20fc5bf7SElliott Mitchell #include <vm/vm.h>
34*20fc5bf7SElliott Mitchell #include <vm/pmap.h>
35*20fc5bf7SElliott Mitchell
366d765bffSElliott Mitchell #include <machine/atomic.h> /* required by xen/xen-os.h */
376d765bffSElliott Mitchell
386d765bffSElliott Mitchell #include <xen/xen-os.h>
396d765bffSElliott Mitchell #include <xen/hvm.h>
406d765bffSElliott Mitchell
41*20fc5bf7SElliott Mitchell #include <contrib/xen/vcpu.h>
42*20fc5bf7SElliott Mitchell
436d765bffSElliott Mitchell /*-------------------------------- Global Data -------------------------------*/
446d765bffSElliott Mitchell /**
456d765bffSElliott Mitchell * Start info flags. ATM this only used to store the initial domain flag for
466d765bffSElliott Mitchell * PVHv2, and it's always empty for HVM guests.
476d765bffSElliott Mitchell */
486d765bffSElliott Mitchell uint32_t hvm_start_flags;
496d765bffSElliott Mitchell
506d765bffSElliott Mitchell /*------------------ Hypervisor Access Shared Memory Regions -----------------*/
516d765bffSElliott Mitchell shared_info_t *HYPERVISOR_shared_info;
52*20fc5bf7SElliott Mitchell
53*20fc5bf7SElliott Mitchell /*------------------------------- Per-CPU Data -------------------------------*/
54*20fc5bf7SElliott Mitchell DPCPU_DEFINE(struct vcpu_info *, vcpu_info);
55*20fc5bf7SElliott Mitchell
56*20fc5bf7SElliott Mitchell void
xen_setup_vcpu_info(void)57*20fc5bf7SElliott Mitchell xen_setup_vcpu_info(void)
58*20fc5bf7SElliott Mitchell {
59*20fc5bf7SElliott Mitchell /* This isn't directly accessed outside this function */
60*20fc5bf7SElliott Mitchell DPCPU_DEFINE_STATIC(vcpu_info_t, vcpu_local_info)
61*20fc5bf7SElliott Mitchell __attribute__((aligned(64)));
62*20fc5bf7SElliott Mitchell
63*20fc5bf7SElliott Mitchell vcpu_info_t *vcpu_info = DPCPU_PTR(vcpu_local_info);
64*20fc5bf7SElliott Mitchell vcpu_register_vcpu_info_t info = {
65*20fc5bf7SElliott Mitchell .mfn = vtophys(vcpu_info) >> PAGE_SHIFT,
66*20fc5bf7SElliott Mitchell .offset = vtophys(vcpu_info) & PAGE_MASK,
67*20fc5bf7SElliott Mitchell };
68*20fc5bf7SElliott Mitchell unsigned int cpu = XEN_VCPUID();
69*20fc5bf7SElliott Mitchell int rc;
70*20fc5bf7SElliott Mitchell
71*20fc5bf7SElliott Mitchell KASSERT(xen_domain(), ("%s(): invoked when not on Xen?", __func__));
72*20fc5bf7SElliott Mitchell
73*20fc5bf7SElliott Mitchell _Static_assert(sizeof(struct vcpu_info) <= 64,
74*20fc5bf7SElliott Mitchell "struct vcpu_info is larger than supported limit of 64 bytes");
75*20fc5bf7SElliott Mitchell
76*20fc5bf7SElliott Mitchell /*
77*20fc5bf7SElliott Mitchell * Set the vCPU info.
78*20fc5bf7SElliott Mitchell *
79*20fc5bf7SElliott Mitchell * NB: the vCPU info for some vCPUs can be fetched from the shared info
80*20fc5bf7SElliott Mitchell * page, but in order to make sure the mapping code is correct always
81*20fc5bf7SElliott Mitchell * attempt to map the vCPU info at a custom place.
82*20fc5bf7SElliott Mitchell */
83*20fc5bf7SElliott Mitchell rc = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
84*20fc5bf7SElliott Mitchell if (rc == 0)
85*20fc5bf7SElliott Mitchell DPCPU_SET(vcpu_info, vcpu_info);
86*20fc5bf7SElliott Mitchell else if (cpu < nitems(HYPERVISOR_shared_info->vcpu_info)) {
87*20fc5bf7SElliott Mitchell static bool warned = false;
88*20fc5bf7SElliott Mitchell
89*20fc5bf7SElliott Mitchell DPCPU_SET(vcpu_info, &HYPERVISOR_shared_info->vcpu_info[cpu]);
90*20fc5bf7SElliott Mitchell
91*20fc5bf7SElliott Mitchell if (bootverbose && !warned) {
92*20fc5bf7SElliott Mitchell warned = true;
93*20fc5bf7SElliott Mitchell printf(
94*20fc5bf7SElliott Mitchell "WARNING: Xen vCPU %u failed to setup vcpu_info rc = %d\n",
95*20fc5bf7SElliott Mitchell cpu, rc);
96*20fc5bf7SElliott Mitchell }
97*20fc5bf7SElliott Mitchell } else
98*20fc5bf7SElliott Mitchell panic("Unable to register vCPU %u, rc=%d\n", cpu, rc);
99*20fc5bf7SElliott Mitchell }
100