cfa0b7b82f
HYPERVISOR_start_info is only available to PV and PVHv1 guests, HVM and PVHv2 guests get this data from HVM parameters that are fetched using a hypercall. Instead provide a set of helper functions that should be used to fetch this data. The helper functions have different implementations depending on whether FreeBSD is running as PVHv1 or HVM/PVHv2 guest type. This helps to cleanup generic Xen code by removing quite a lot of xen_pv_domain and xen_hvm_domain macro usages. Sponsored by: Citrix Systems R&D
166 lines
4.4 KiB
C
166 lines
4.4 KiB
C
/*
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* Copyright (c) 2014 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/types.h>
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#include <sys/cdefs.h>
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#include <sys/errno.h>
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#include <sys/uio.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/conf.h>
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#include <sys/module.h>
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#include <xen/xen-os.h>
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#include <xen/hypervisor.h>
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#include <xen/xenstore/xenstorevar.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#define XSD_READ_SIZE 20
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static int xsd_dev_read(struct cdev *dev, struct uio *uio, int ioflag);
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static int xsd_dev_mmap(struct cdev *dev, vm_ooffset_t offset,
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vm_paddr_t *paddr, int nprot, vm_memattr_t *memattr);
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static struct cdevsw xsd_dev_cdevsw = {
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.d_version = D_VERSION,
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.d_read = xsd_dev_read,
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.d_mmap = xsd_dev_mmap,
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.d_name = "xsd_dev",
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};
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static int
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xsd_dev_read(struct cdev *dev, struct uio *uio, int ioflag)
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{
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char evtchn[XSD_READ_SIZE];
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int error, len;
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len = snprintf(evtchn, sizeof(evtchn), "%u", xs_evtchn());
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if (len < 0 || len > uio->uio_resid)
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return (EINVAL);
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error = uiomove(evtchn, len, uio);
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if (error)
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return (error);
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return (0);
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}
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static int
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xsd_dev_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
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int nprot, vm_memattr_t *memattr)
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{
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if (offset != 0)
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return (EINVAL);
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*paddr = xs_address();
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return (0);
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}
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/*------------------ Private Device Attachment Functions --------------------*/
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/**
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* \brief Identify instances of this device type in the system.
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*
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* \param driver The driver performing this identify action.
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* \param parent The NewBus parent device for any devices this method adds.
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*/
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static void
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xsd_dev_identify(driver_t *driver __unused, device_t parent)
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{
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if (!xen_domain() || xs_initialized())
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return;
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/*
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* Only attach if xenstore is not available, because we are the
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* domain that's supposed to run it.
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*/
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BUS_ADD_CHILD(parent, 0, driver->name, 0);
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}
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/**
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* \brief Probe for the existence of the Xenstored device
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*
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* \param dev NewBus device_t for this instance.
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*
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* \return Always returns 0 indicating success.
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*/
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static int
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xsd_dev_probe(device_t dev)
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{
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device_set_desc(dev, "Xenstored user-space device");
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return (BUS_PROBE_NOWILDCARD);
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}
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/**
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* \brief Attach the Xenstored device.
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*
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* \param dev NewBus device_t for this instance.
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*
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* \return On success, 0. Otherwise an errno value indicating the
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* type of failure.
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*/
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static int
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xsd_dev_attach(device_t dev)
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{
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struct cdev *xsd_cdev;
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xsd_cdev = make_dev(&xsd_dev_cdevsw, 0, UID_ROOT, GID_WHEEL, 0400,
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"xen/xenstored");
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if (xsd_cdev == NULL)
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return (EINVAL);
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return (0);
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}
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/*-------------------- Private Device Attachment Data -----------------------*/
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static device_method_t xsd_dev_methods[] = {
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/* Device interface */
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DEVMETHOD(device_identify, xsd_dev_identify),
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DEVMETHOD(device_probe, xsd_dev_probe),
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DEVMETHOD(device_attach, xsd_dev_attach),
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DEVMETHOD_END
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};
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DEFINE_CLASS_0(xsd_dev, xsd_dev_driver, xsd_dev_methods, 0);
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devclass_t xsd_dev_devclass;
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DRIVER_MODULE(xsd_dev, xenpv, xsd_dev_driver, xsd_dev_devclass,
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NULL, NULL);
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