80961fa69a
When booted as PVHv2, there's no ACPI CPU object, so attach the PV CPU device in order to take it's place. This is required in case some device or driver tries to poke at the PCPU device field. Sponsored by: Citrix Systems R&D
100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
/*
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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/module.h>
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#include <sys/pcpu.h>
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#include <sys/smp.h>
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#include <xen/xen-os.h>
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/*
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* Dummy Xen cpu device
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*
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* Since there's no ACPI on PVH guests, we need to create a dummy
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* CPU device in order to fill the pcpu->pc_device field.
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*/
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static void
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xenpvcpu_identify(driver_t *driver, device_t parent)
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{
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int i;
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/* Only attach in case the per-CPU device is not set. */
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if (!xen_domain() || PCPU_GET(device) != NULL)
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return;
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CPU_FOREACH(i) {
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if (BUS_ADD_CHILD(parent, 0, "pvcpu", i) == NULL)
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panic("Unable to add Xen PV CPU device.");
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}
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}
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static int
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xenpvcpu_probe(device_t dev)
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{
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device_set_desc(dev, "Xen PV CPU");
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return (BUS_PROBE_NOWILDCARD);
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}
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static int
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xenpvcpu_attach(device_t dev)
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{
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struct pcpu *pc;
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int cpu;
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cpu = device_get_unit(dev);
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pc = pcpu_find(cpu);
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pc->pc_device = dev;
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return (0);
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}
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static device_method_t xenpvcpu_methods[] = {
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DEVMETHOD(device_identify, xenpvcpu_identify),
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DEVMETHOD(device_probe, xenpvcpu_probe),
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DEVMETHOD(device_attach, xenpvcpu_attach),
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DEVMETHOD_END
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};
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static driver_t xenpvcpu_driver = {
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"pvcpu",
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xenpvcpu_methods,
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0,
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};
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devclass_t xenpvcpu_devclass;
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DRIVER_MODULE(xenpvcpu, xenpv, xenpvcpu_driver, xenpvcpu_devclass, 0, 0);
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MODULE_DEPEND(xenpvcpu, xenpv, 1, 1, 1);
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