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Diffstat (limited to 'sys/x86/xen/pvcpu_enum.c')
-rw-r--r--sys/x86/xen/pvcpu_enum.c134
1 files changed, 134 insertions, 0 deletions
diff --git a/sys/x86/xen/pvcpu_enum.c b/sys/x86/xen/pvcpu_enum.c
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index 000000000000..df092cb8c523
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+++ b/sys/x86/xen/pvcpu_enum.c
@@ -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);