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- /*-
- * SPDX-License-Identifier: BSD-2-Clause
- *
- * Copyright © 2008, 2013 Citrix Systems, Inc.
- * Copyright © 2012 Spectra Logic Corporation
- * Copyright © 2021 Elliott Mitchell
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #include <sys/param.h> /* required by xen/xen-os.h */
- #include <vm/vm.h>
- #include <vm/pmap.h>
- #include <machine/atomic.h> /* required by xen/xen-os.h */
- #include <xen/xen-os.h>
- #include <xen/hvm.h>
- #include <contrib/xen/vcpu.h>
- /*-------------------------------- Global Data -------------------------------*/
- /**
- * Start info flags. ATM this only used to store the initial domain flag for
- * PVHv2, and it's always empty for HVM guests.
- */
- uint32_t hvm_start_flags;
- /*------------------ Hypervisor Access Shared Memory Regions -----------------*/
- shared_info_t *HYPERVISOR_shared_info;
- /*------------------------------- Per-CPU Data -------------------------------*/
- DPCPU_DEFINE(struct vcpu_info *, vcpu_info);
- void
- xen_setup_vcpu_info(void)
- {
- /* This isn't directly accessed outside this function */
- DPCPU_DEFINE_STATIC(vcpu_info_t, vcpu_local_info)
- __attribute__((aligned(64)));
- vcpu_info_t *vcpu_info = DPCPU_PTR(vcpu_local_info);
- vcpu_register_vcpu_info_t info = {
- .mfn = vtophys(vcpu_info) >> PAGE_SHIFT,
- .offset = vtophys(vcpu_info) & PAGE_MASK,
- };
- unsigned int cpu = XEN_VCPUID();
- int rc;
- KASSERT(xen_domain(), ("%s(): invoked when not on Xen?", __func__));
- _Static_assert(sizeof(struct vcpu_info) <= 64,
- "struct vcpu_info is larger than supported limit of 64 bytes");
- /*
- * Set the vCPU info.
- *
- * NB: the vCPU info for some vCPUs can be fetched from the shared info
- * page, but in order to make sure the mapping code is correct always
- * attempt to map the vCPU info at a custom place.
- */
- rc = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
- if (rc == 0)
- DPCPU_SET(vcpu_info, vcpu_info);
- else if (cpu < nitems(HYPERVISOR_shared_info->vcpu_info)) {
- static bool warned = false;
- DPCPU_SET(vcpu_info, &HYPERVISOR_shared_info->vcpu_info[cpu]);
- if (bootverbose && !warned) {
- warned = true;
- printf(
- "WARNING: Xen vCPU %u failed to setup vcpu_info rc = %d\n",
- cpu, rc);
- }
- } else
- panic("Unable to register vCPU %u, rc=%d\n", cpu, rc);
- }
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