1 files changed, 109 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/hypervisor.c b/arch/x86/kernel/cpu/hypervisor.c
new file mode 100644
index 000000000..553bfbfc3
--- /dev/null
+++ b/arch/x86/kernel/cpu/hypervisor.c
@@ -0,0 +1,109 @@
+/*
+ * Common hypervisor code
+ *
+ * Copyright (C) 2008, VMware, Inc.
+ * Author : Alok N Kataria <akataria@vmware.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/export.h>
+#include <asm/processor.h>
+#include <asm/hypervisor.h>
+
+static const __initconst struct hypervisor_x86 * const hypervisors[] =
+{
+#ifdef CONFIG_XEN_PV
+	&x86_hyper_xen_pv,
+#endif
+#ifdef CONFIG_XEN_PVHVM
+	&x86_hyper_xen_hvm,
+#endif
+	&x86_hyper_vmware,
+	&x86_hyper_ms_hyperv,
+#ifdef CONFIG_KVM_GUEST
+	&x86_hyper_kvm,
+#endif
+#ifdef CONFIG_JAILHOUSE_GUEST
+	&x86_hyper_jailhouse,
+#endif
+#ifdef CONFIG_ACRN_GUEST
+	&x86_hyper_acrn,
+#endif
+};
+
+enum x86_hypervisor_type x86_hyper_type;
+EXPORT_SYMBOL(x86_hyper_type);
+
+bool __initdata nopv;
+static __init int parse_nopv(char *arg)
+{
+	nopv = true;
+	return 0;
+}
+early_param("nopv", parse_nopv);
+
+static inline const struct hypervisor_x86 * __init
+detect_hypervisor_vendor(void)
+{
+	const struct hypervisor_x86 *h = NULL, * const *p;
+	uint32_t pri, max_pri = 0;
+
+	for (p = hypervisors; p < hypervisors + ARRAY_SIZE(hypervisors); p++) {
+		if (unlikely(nopv) && !(*p)->ignore_nopv)
+			continue;
+
+		pri = (*p)->detect();
+		if (pri > max_pri) {
+			max_pri = pri;
+			h = *p;
+		}
+	}
+
+	if (h)
+		pr_info("Hypervisor detected: %s\n", h->name);
+
+	return h;
+}
+
+static void __init copy_array(const void *src, void *target, unsigned int size)
+{
+	unsigned int i, n = size / sizeof(void *);
+	const void * const *from = (const void * const *)src;
+	const void **to = (const void **)target;
+
+	for (i = 0; i < n; i++)
+		if (from[i])
+			to[i] = from[i];
+}
+
+void __init init_hypervisor_platform(void)
+{
+	const struct hypervisor_x86 *h;
+
+	h = detect_hypervisor_vendor();
+
+	if (!h)
+		return;
+
+	copy_array(&h->init, &x86_init.hyper, sizeof(h->init));
+	copy_array(&h->runtime, &x86_platform.hyper, sizeof(h->runtime));
+
+	x86_hyper_type = h->type;
+	x86_init.hyper.init_platform();
+}