HyperV detection patch
Ky Srinivasan
ksrinivasan at novell.com
Wed Apr 28 20:36:05 UTC 2010
This is a resend of a patch I had posted a couple of weeks ago. As suggested by Jeremy, I am enclosing a patch that integrates HyperV detection with the current hypervisor detection mechanism in the kernel. A patch for implementing a HyperV clock source based on this patch will be sent out shortly.
From: K. Y. Srinivasan <ksrinivasan at novell.com>
Subject: HyperV Detection code.
References: None
Patch-mainline:
This patch integrates HyperV detection within the framework currently used by
VmWare. With this patch, we can avoid having to replicate the HyperV detection
code in each of the HyperV specific Linux drivers - MSFT Linux Integration
Components.
Signed-off-by: K. Y. Srinivasan <ksrinivasan at novell.com>
Index: linux-2.6.34-rc4/arch/x86/include/asm/processor.h
===================================================================
--- linux-2.6.34-rc4.orig/arch/x86/include/asm/processor.h 2010-04-12 19:41:35.000000000 -0600
+++ linux-2.6.34-rc4/arch/x86/include/asm/processor.h 2010-04-15 10:00:18.000000000 -0600
@@ -114,6 +114,8 @@ struct cpuinfo_x86 {
u16 cpu_index;
#endif
unsigned int x86_hyper_vendor;
+ /* The layout of this field is hypervisor specific */
+ unsigned int x86_hyper_features;
} __attribute__((__aligned__(SMP_CACHE_BYTES)));
#define X86_VENDOR_INTEL 0
@@ -129,6 +131,7 @@ struct cpuinfo_x86 {
#define X86_HYPER_VENDOR_NONE 0
#define X86_HYPER_VENDOR_VMWARE 1
+#define X86_HYPER_VENDOR_MSFT 2
/*
* capabilities of CPUs
Index: linux-2.6.34-rc4/arch/x86/kernel/cpu/Makefile
===================================================================
--- linux-2.6.34-rc4.orig/arch/x86/kernel/cpu/Makefile 2010-04-12 19:41:35.000000000 -0600
+++ linux-2.6.34-rc4/arch/x86/kernel/cpu/Makefile 2010-04-15 10:00:18.000000000 -0600
@@ -14,7 +14,7 @@ CFLAGS_common.o := $(nostackp)
obj-y := intel_cacheinfo.o addon_cpuid_features.o
obj-y += proc.o capflags.o powerflags.o common.o
-obj-y += vmware.o hypervisor.o sched.o
+obj-y += vmware.o hypervisor.o sched.o hyperv.o
obj-$(CONFIG_X86_32) += bugs.o cmpxchg.o
obj-$(CONFIG_X86_64) += bugs_64.o
Index: linux-2.6.34-rc4/arch/x86/kernel/cpu/hyperv.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.34-rc4/arch/x86/kernel/cpu/hyperv.c 2010-04-15 10:00:18.000000000 -0600
@@ -0,0 +1,66 @@
+/*
+ * HyperV Detection code.
+ *
+ * Copyright (C) 2010, Novell, Inc.
+ * Author : K. Y. Srinivasan <ksrinivasan at 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; 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/types.h>
+#include <asm/processor.h>
+#include <asm/hyperv.h>
+
+
+int hyperv_platform(void)
+{
+ u32 eax, ebx, ecx, edx;
+ char hyp_signature[13];
+
+ cpuid(1, &eax, &ebx, &ecx, &edx);
+ if (!(ecx & HYPERV_HYPERVISOR_PRESENT_BIT))
+ return 0;
+
+ cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS, &eax, &ebx, &ecx, &edx);
+ *(u32 *)(hyp_signature + 0) = ebx;
+ *(u32 *)(hyp_signature + 4) = ecx;
+ *(u32 *)(hyp_signature + 8) = edx;
+
+ if ((eax < HYPERV_CPUID_MIN) || (memcmp("Microsoft Hv", hyp_signature, 12)))
+ return 0;
+ return 1;
+}
+
+void __cpuinit hyperv_set_feature_bits(struct cpuinfo_x86 *c)
+{
+ u32 eax, ebx, ecx, edx;
+
+ c->x86_hyper_features = 0;
+ /*
+ * Extract the features, recommendations etc.
+ * The first 9 bits will be used to track hypervisor features.
+ * The next 6 bits will be used to track the hypervisor
+ * recommendations.
+ */
+ cpuid(HYPERV_CPUID_FEATURES, &eax, &ebx, &ecx, &edx);
+ c->x86_hyper_features |= (eax & 0x1ff);
+
+ cpuid(HYPERV_CPUID_ENLIGHTMENT_INFO, &eax, &ebx, &ecx, &edx);
+ c->x86_hyper_features |= ((eax & 0x3f) << 9);
+ printk(KERN_INFO "Detected HyperV with features: %x\n",
+ c->x86_hyper_features);
+}
Index: linux-2.6.34-rc4/arch/x86/kernel/cpu/hypervisor.c
===================================================================
--- linux-2.6.34-rc4.orig/arch/x86/kernel/cpu/hypervisor.c 2010-04-12 19:41:35.000000000 -0600
+++ linux-2.6.34-rc4/arch/x86/kernel/cpu/hypervisor.c 2010-04-15 10:00:18.000000000 -0600
@@ -23,6 +23,7 @@
#include <asm/processor.h>
#include <asm/vmware.h>
+#include <asm/hyperv.h>
#include <asm/hypervisor.h>
static inline void __cpuinit
@@ -30,6 +31,8 @@ detect_hypervisor_vendor(struct cpuinfo_
{
if (vmware_platform())
c->x86_hyper_vendor = X86_HYPER_VENDOR_VMWARE;
+ else if (hyperv_platform())
+ c->x86_hyper_vendor = X86_HYPER_VENDOR_MSFT;
else
c->x86_hyper_vendor = X86_HYPER_VENDOR_NONE;
}
@@ -37,10 +40,11 @@ detect_hypervisor_vendor(struct cpuinfo_
static inline void __cpuinit
hypervisor_set_feature_bits(struct cpuinfo_x86 *c)
{
- if (boot_cpu_data.x86_hyper_vendor == X86_HYPER_VENDOR_VMWARE) {
+ if (boot_cpu_data.x86_hyper_vendor == X86_HYPER_VENDOR_VMWARE)
vmware_set_feature_bits(c);
- return;
- }
+ else if (boot_cpu_data.x86_hyper_vendor == X86_HYPER_VENDOR_MSFT)
+ hyperv_set_feature_bits(c);
+ return;
}
void __cpuinit init_hypervisor(struct cpuinfo_x86 *c)
Index: linux-2.6.34-rc4/arch/x86/include/asm/hyperv.h
===================================================================
--- linux-2.6.34-rc4.orig/arch/x86/include/asm/hyperv.h 2010-04-12 19:41:35.000000000 -0600
+++ linux-2.6.34-rc4/arch/x86/include/asm/hyperv.h 2010-04-15 13:06:58.000000000 -0600
@@ -2,6 +2,8 @@
#define _ASM_X86_KVM_HYPERV_H
#include <linux/types.h>
+#include <linux/init.h>
+#include <asm/processor.h>
/*
* The below CPUID leaves are present if VersionAndFeatures.HypervisorPresent
@@ -14,6 +16,9 @@
#define HYPERV_CPUID_ENLIGHTMENT_INFO 0x40000004
#define HYPERV_CPUID_IMPLEMENT_LIMITS 0x40000005
+#define HYPERV_HYPERVISOR_PRESENT_BIT 0x80000000
+#define HYPERV_CPUID_MIN 0x40000005
+
/*
* Feature identification. EAX indicates which features are available
* to the partition based upon the current partition privileges.
@@ -129,6 +134,9 @@
/* MSR used to provide vcpu index */
#define HV_X64_MSR_VP_INDEX 0x40000002
+/* MSR used to read the per-partition time reference counter */
+#define HV_X64_MSR_TIME_REF_COUNT 0x40000020
+
/* Define the virtual APIC registers */
#define HV_X64_MSR_EOI 0x40000070
#define HV_X64_MSR_ICR 0x40000071
@@ -183,4 +191,6 @@
#define HV_STATUS_INVALID_HYPERCALL_INPUT 3
#define HV_STATUS_INVALID_ALIGNMENT 4
+int hyperv_platform(void);
+void __cpuinit hyperv_set_feature_bits(struct cpuinfo_x86 *c);
#endif
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