1 files changed, 55 insertions, 0 deletions

diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
new file mode 100644
index 000000000000..16f41bbe46b6
--- /dev/null
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -0,0 +1,55 @@
+/*
+ * HyperV  Detection code.
+ *
+ * Copyright (C) 2010, Novell, Inc.
+ * Author : K. Y. Srinivasan <ksrinivasan@novell.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; version 2 of the License.
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/module.h>
+#include <asm/processor.h>
+#include <asm/hypervisor.h>
+#include <asm/hyperv.h>
+#include <asm/mshyperv.h>
+
+struct ms_hyperv_info ms_hyperv;
+
+static bool __init ms_hyperv_platform(void)
+{
+        u32 eax;
+        u32 hyp_signature[3];
+
+        if (!boot_cpu_has(X86_FEATURE_HYPERVISOR))
+                return false;
+
+        cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS,
+              &eax, &hyp_signature[0], &hyp_signature[1], &hyp_signature[2]);
+
+        return eax >= HYPERV_CPUID_MIN &&
+                eax <= HYPERV_CPUID_MAX &&
+                !memcmp("Microsoft Hv", hyp_signature, 12);
+}
+
+static void __init ms_hyperv_init_platform(void)
+{
+        /*
+         * Extract the features and hints
+         */
+        ms_hyperv.features = cpuid_eax(HYPERV_CPUID_FEATURES);
+        ms_hyperv.hints    = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO);
+
+        printk(KERN_INFO "HyperV: features 0x%x, hints 0x%x\n",
+               ms_hyperv.features, ms_hyperv.hints);
+}
+
+const __refconst struct hypervisor_x86 x86_hyper_ms_hyperv = {
+        .name                   = "Microsoft HyperV",
+        .detect                 = ms_hyperv_platform,
+        .init_platform          = ms_hyperv_init_platform,
+};
+EXPORT_SYMBOL(x86_hyper_ms_hyperv);