[Xen-devel] [PATCH v10 15/20] xen: create a PV CPU device for PVH guests

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Since there's no ACPI on PVH guests, we need to create a dummy CPU
device in order to fill the pcpu->pc_device field.
---
 sys/conf/files            |    1 +
 sys/dev/xen/pvcpu/pvcpu.c |  101 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 102 insertions(+), 0 deletions(-)
 create mode 100644 sys/dev/xen/pvcpu/pvcpu.c

diff --git a/sys/conf/files b/sys/conf/files
index bddf021..178d5e2 100644
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -2500,6 +2500,7 @@ dev/xen/netback/netback.c optional xen | xenhvm
 dev/xen/netfront/netfront.c    optional xen | xenhvm
 dev/xen/xenpci/xenpci.c                optional xenpci
 dev/xen/timer/timer.c          optional xen | xenhvm
+dev/xen/pvcpu/pvcpu.c          optional xen | xenhvm
 dev/xl/if_xl.c                 optional xl pci
 dev/xl/xlphy.c                 optional xl pci
 fs/deadfs/dead_vnops.c         standard
diff --git a/sys/dev/xen/pvcpu/pvcpu.c b/sys/dev/xen/pvcpu/pvcpu.c
new file mode 100644
index 0000000..7f3697c
--- /dev/null
+++ b/sys/dev/xen/pvcpu/pvcpu.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2013 Roger Pau Monnà <roger.pau@xxxxxxxxxx>
+ * 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/module.h>
+#include <sys/pcpu.h>
+#include <sys/smp.h>
+
+#include <xen/xen-os.h>
+
+/*
+ * Dummy Xen cpu device
+ *
+ * Since there's no ACPI on PVH guests, we need to create a dummy
+ * CPU device in order to fill the pcpu->pc_device field.
+ */
+
+static void
+xenpvcpu_identify(driver_t *driver, device_t parent)
+{
+       device_t child;
+       int i;
+
+       /* Only attach to PV guests, HVM guests use the ACPI CPU devices */
+       if (!xen_pv_domain())
+               return;
+
+       CPU_FOREACH(i) {
+               child = BUS_ADD_CHILD(parent, 0, "pvcpu", i);
+               if (child == NULL)
+                       panic("xenpvcpu_identify add pvcpu");
+       }
+}
+
+static int
+xenpvcpu_probe(device_t dev)
+{
+
+       device_set_desc(dev, "Xen PV CPU");
+       return (BUS_PROBE_NOWILDCARD);
+}
+
+static int
+xenpvcpu_attach(device_t dev)
+{
+       struct pcpu *pc;
+       int cpu;
+
+       cpu = device_get_unit(dev);
+       pc = pcpu_find(cpu);
+       pc->pc_device = dev;
+       return (0);
+}
+
+static device_method_t xenpvcpu_methods[] = {
+       DEVMETHOD(device_identify, xenpvcpu_identify),
+       DEVMETHOD(device_probe, xenpvcpu_probe),
+       DEVMETHOD(device_attach, xenpvcpu_attach),
+
+       DEVMETHOD_END
+};
+
+static driver_t xenpvcpu_driver = {
+       "pvcpu",
+       xenpvcpu_methods,
+       0,
+};
+
+devclass_t xenpvcpu_devclass;
+
+DRIVER_MODULE(xenpvcpu, xenpv, xenpvcpu_driver, xenpvcpu_devclass, 0, 0);
+MODULE_DEPEND(xenpvcpu, xenpv, 1, 1, 1);
-- 
1.7.7.5 (Apple Git-26)


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