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xen: add an apic_enumerator for PVH

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On PVH there's no ACPI, so the CPU enumeration must be implemented
using Xen hypercalls.

Approved by: gibbs
Sponsored by: Citrix Systems R&D

x86/xen/pvcpu_enum.c:
 - Enumerate avaiable vCPUs on PVH by using the VCPUOP_is_up
   hypercall.
 - Set vcpu_id for PVH guests.

conf/files.amd64:
 - Include the PV CPU enumerator in the XENHVM build.
This commit is contained in:
Roger Pau Monné 2014-03-11 10:25:08 +00:00
parent 4d30a3fb95
commit 3d80242f23
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=263011
2 changed files with 135 additions and 0 deletions
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1
sys/conf/files.amd64
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@ -558,3 +558,4 @@ x86/x86/delay.c standard
x86/xen/hvm.c optional xenhvm
x86/xen/xen_intr.c optional xen | xenhvm
x86/xen/pv.c optional xenhvm
x86/xen/pvcpu_enum.c optional xenhvm

134
sys/x86/xen/pvcpu_enum.c Normal file
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@ -0,0 +1,134 @@
/*-
* Copyright (c) 2003 John Baldwin <jhb@FreeBSD.org>
* Copyright (c) 2013 Roger Pau Monné <roger.pau@citrix.com>
* 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/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/smp.h>
#include <sys/pcpu.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/intr_machdep.h>
#include <x86/apicvar.h>
#include <machine/cpu.h>
#include <machine/smp.h>
#include <xen/xen-os.h>
#include <xen/hypervisor.h>
#include <xen/interface/vcpu.h>
static int xenpv_probe(void);
static int xenpv_probe_cpus(void);
static int xenpv_setup_local(void);
static int xenpv_setup_io(void);
static struct apic_enumerator xenpv_enumerator = {
"Xen PV",
xenpv_probe,
xenpv_probe_cpus,
xenpv_setup_local,
xenpv_setup_io
};
/*
* This enumerator will only be registered on PVH
*/
static int
xenpv_probe(void)
{
return (-100);
}
/*
* Test each possible vCPU in order to find the number of vCPUs
*/
static int
xenpv_probe_cpus(void)
{
#ifdef SMP
int i, ret;
for (i = 0; i < MAXCPU; i++) {
ret = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
if (ret >= 0)
lapic_create((i * 2), (i == 0));
}
#endif
return (0);
}
/*
* Initialize the vCPU id of the BSP
*/
static int
xenpv_setup_local(void)
{
PCPU_SET(vcpu_id, 0);
lapic_init(0);
return (0);
}
/*
* On PVH guests there's no IO APIC
*/
static int
xenpv_setup_io(void)
{
return (0);
}
static void
xenpv_register(void *dummy __unused)
{
if (xen_pv_domain()) {
apic_register_enumerator(&xenpv_enumerator);
}
}
SYSINIT(xenpv_register, SI_SUB_TUNABLES - 1, SI_ORDER_FIRST, xenpv_register, NULL);
/*
* Setup per-CPU vCPU IDs
*/
static void
xenpv_set_ids(void *dummy)
{
struct pcpu *pc;
int i;
CPU_FOREACH(i) {
pc = pcpu_find(i);
pc->pc_vcpu_id = i;
}
}
SYSINIT(xenpv_set_ids, SI_SUB_CPU, SI_ORDER_MIDDLE, xenpv_set_ids, NULL);