d9aa19f1f4
Lower the quality of the MADT ACPI enumerator, so on Xen Dom0 we can force the usage of the Xen mptable enumerator even when ACPI is detected. This is needed because Xen might restrict the number of vCPUs available to Dom0, but the MADT ACPI table parsed in FreeBSD is the native one (which enumerates all the CPUs available in the system). Sponsored by: Citrix Systems R&D Reviewed by: gibbs x86/acpica/madt.c: - Lower MADT enumerator quality to -50. x86/xen/pvcpu_enum.c: - Rise Xen PV enumerator to 0.
135 lines
3.1 KiB
C
135 lines
3.1 KiB
C
/*-
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* Copyright (c) 2003 John Baldwin <jhb@FreeBSD.org>
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* Copyright (c) 2013 Roger Pau Monné <roger.pau@citrix.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/smp.h>
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#include <sys/pcpu.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <machine/intr_machdep.h>
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#include <x86/apicvar.h>
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#include <machine/cpu.h>
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#include <machine/smp.h>
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#include <xen/xen-os.h>
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#include <xen/hypervisor.h>
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#include <xen/interface/vcpu.h>
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static int xenpv_probe(void);
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static int xenpv_probe_cpus(void);
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static int xenpv_setup_local(void);
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static int xenpv_setup_io(void);
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static struct apic_enumerator xenpv_enumerator = {
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"Xen PV",
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xenpv_probe,
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xenpv_probe_cpus,
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xenpv_setup_local,
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xenpv_setup_io
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};
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/*
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* This enumerator will only be registered on PVH
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*/
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static int
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xenpv_probe(void)
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{
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return (0);
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}
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/*
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* Test each possible vCPU in order to find the number of vCPUs
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*/
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static int
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xenpv_probe_cpus(void)
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{
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#ifdef SMP
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int i, ret;
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for (i = 0; i < MAXCPU; i++) {
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ret = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
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if (ret >= 0)
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lapic_create((i * 2), (i == 0));
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}
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#endif
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return (0);
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}
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/*
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* Initialize the vCPU id of the BSP
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*/
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static int
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xenpv_setup_local(void)
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{
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PCPU_SET(vcpu_id, 0);
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lapic_init(0);
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return (0);
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}
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/*
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* On PVH guests there's no IO APIC
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*/
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static int
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xenpv_setup_io(void)
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{
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return (0);
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}
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static void
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xenpv_register(void *dummy __unused)
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{
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if (xen_pv_domain()) {
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apic_register_enumerator(&xenpv_enumerator);
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}
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}
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SYSINIT(xenpv_register, SI_SUB_TUNABLES - 1, SI_ORDER_FIRST, xenpv_register, NULL);
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/*
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* Setup per-CPU vCPU IDs
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*/
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static void
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xenpv_set_ids(void *dummy)
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{
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struct pcpu *pc;
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int i;
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CPU_FOREACH(i) {
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pc = pcpu_find(i);
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pc->pc_vcpu_id = i;
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}
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}
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SYSINIT(xenpv_set_ids, SI_SUB_CPU, SI_ORDER_MIDDLE, xenpv_set_ids, NULL);
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