1/*
  2 * VMware Detection code.
  3 *
  4 * Copyright (C) 2008, VMware, Inc.
  5 * Author : Alok N Kataria <akataria@vmware.com>
  6 *
  7 * This program is free software; you can redistribute it and/or modify
  8 * it under the terms of the GNU General Public License as published by
  9 * the Free Software Foundation; either version 2 of the License, or
 10 * (at your option) any later version.
 11 *
 12 * This program is distributed in the hope that it will be useful, but
 13 * WITHOUT ANY WARRANTY; without even the implied warranty of
 14 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 15 * NON INFRINGEMENT.  See the GNU General Public License for more
 16 * details.
 17 *
 18 * You should have received a copy of the GNU General Public License
 19 * along with this program; if not, write to the Free Software
 20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 21 *
 22 */
 23
 24#include <linux/dmi.h>
 25#include <linux/init.h>
 26#include <linux/export.h>
 27#include <linux/clocksource.h>
 28#include <asm/div64.h>
 29#include <asm/x86_init.h>
 30#include <asm/hypervisor.h>
 31#include <asm/timer.h>
 32#include <asm/apic.h>
 
 33
 34#undef pr_fmt
 35#define pr_fmt(fmt)	"vmware: " fmt
 36
 37#define CPUID_VMWARE_INFO_LEAF	0x40000000
 38#define VMWARE_HYPERVISOR_MAGIC	0x564D5868
 39#define VMWARE_HYPERVISOR_PORT	0x5658
 40
 41#define VMWARE_PORT_CMD_GETVERSION	10
 42#define VMWARE_PORT_CMD_GETHZ		45
 43#define VMWARE_PORT_CMD_GETVCPU_INFO	68
 44#define VMWARE_PORT_CMD_LEGACY_X2APIC	3
 45#define VMWARE_PORT_CMD_VCPU_RESERVED	31
 46
 47#define VMWARE_PORT(cmd, eax, ebx, ecx, edx)				\
 48	__asm__("inl (%%dx)" :						\
 49			"=a"(eax), "=c"(ecx), "=d"(edx), "=b"(ebx) :	\
 50			"0"(VMWARE_HYPERVISOR_MAGIC),			\
 51			"1"(VMWARE_PORT_CMD_##cmd),			\
 52			"2"(VMWARE_HYPERVISOR_PORT), "3"(UINT_MAX) :	\
 53			"memory");
 54
 55static unsigned long vmware_tsc_khz __ro_after_init;
 56
 57static inline int __vmware_platform(void)
 58{
 59	uint32_t eax, ebx, ecx, edx;
 60	VMWARE_PORT(GETVERSION, eax, ebx, ecx, edx);
 61	return eax != (uint32_t)-1 && ebx == VMWARE_HYPERVISOR_MAGIC;
 62}
 63
 64static unsigned long vmware_get_tsc_khz(void)
 65{
 66	return vmware_tsc_khz;
 67}
 68
 69#ifdef CONFIG_PARAVIRT
 70static struct cyc2ns_data vmware_cyc2ns __ro_after_init;
 71static int vmw_sched_clock __initdata = 1;
 72
 73static __init int setup_vmw_sched_clock(char *s)
 74{
 75	vmw_sched_clock = 0;
 76	return 0;
 77}
 78early_param("no-vmw-sched-clock", setup_vmw_sched_clock);
 79
 80static unsigned long long vmware_sched_clock(void)
 81{
 82	unsigned long long ns;
 83
 84	ns = mul_u64_u32_shr(rdtsc(), vmware_cyc2ns.cyc2ns_mul,
 85			     vmware_cyc2ns.cyc2ns_shift);
 86	ns -= vmware_cyc2ns.cyc2ns_offset;
 87	return ns;
 88}
 89
 90static void __init vmware_sched_clock_setup(void)
 91{
 92	struct cyc2ns_data *d = &vmware_cyc2ns;
 93	unsigned long long tsc_now = rdtsc();
 94
 95	clocks_calc_mult_shift(&d->cyc2ns_mul, &d->cyc2ns_shift,
 96			       vmware_tsc_khz, NSEC_PER_MSEC, 0);
 97	d->cyc2ns_offset = mul_u64_u32_shr(tsc_now, d->cyc2ns_mul,
 98					   d->cyc2ns_shift);
 99
100	pv_time_ops.sched_clock = vmware_sched_clock;
101	pr_info("using sched offset of %llu ns\n", d->cyc2ns_offset);
102}
103
104static void __init vmware_paravirt_ops_setup(void)
105{
106	pv_info.name = "VMware hypervisor";
107	pv_cpu_ops.io_delay = paravirt_nop;
108
109	if (vmware_tsc_khz && vmw_sched_clock)
110		vmware_sched_clock_setup();
111}
112#else
113#define vmware_paravirt_ops_setup() do {} while (0)
114#endif
115
116/*
117 * VMware hypervisor takes care of exporting a reliable TSC to the guest.
118 * Still, due to timing difference when running on virtual cpus, the TSC can
119 * be marked as unstable in some cases. For example, the TSC sync check at
120 * bootup can fail due to a marginal offset between vcpus' TSCs (though the
121 * TSCs do not drift from each other).  Also, the ACPI PM timer clocksource
122 * is not suitable as a watchdog when running on a hypervisor because the
123 * kernel may miss a wrap of the counter if the vcpu is descheduled for a
124 * long time. To skip these checks at runtime we set these capability bits,
125 * so that the kernel could just trust the hypervisor with providing a
126 * reliable virtual TSC that is suitable for timekeeping.
127 */
128static void __init vmware_set_capabilities(void)
129{
130	setup_force_cpu_cap(X86_FEATURE_CONSTANT_TSC);
131	setup_force_cpu_cap(X86_FEATURE_TSC_RELIABLE);
132}
133
134static void __init vmware_platform_setup(void)
135{
136	uint32_t eax, ebx, ecx, edx;
137	uint64_t lpj, tsc_khz;
138
139	VMWARE_PORT(GETHZ, eax, ebx, ecx, edx);
140
141	if (ebx != UINT_MAX) {
142		lpj = tsc_khz = eax | (((uint64_t)ebx) << 32);
143		do_div(tsc_khz, 1000);
144		WARN_ON(tsc_khz >> 32);
145		pr_info("TSC freq read from hypervisor : %lu.%03lu MHz\n",
146			(unsigned long) tsc_khz / 1000,
147			(unsigned long) tsc_khz % 1000);
148
149		if (!preset_lpj) {
150			do_div(lpj, HZ);
151			preset_lpj = lpj;
152		}
153
154		vmware_tsc_khz = tsc_khz;
155		x86_platform.calibrate_tsc = vmware_get_tsc_khz;
156		x86_platform.calibrate_cpu = vmware_get_tsc_khz;
157
158#ifdef CONFIG_X86_LOCAL_APIC
159		/* Skip lapic calibration since we know the bus frequency. */
160		lapic_timer_frequency = ecx / HZ;
161		pr_info("Host bus clock speed read from hypervisor : %u Hz\n",
162			ecx);
163#endif
164	} else {
165		pr_warn("Failed to get TSC freq from the hypervisor\n");
166	}
167
168	vmware_paravirt_ops_setup();
169
170#ifdef CONFIG_X86_IO_APIC
171	no_timer_check = 1;
172#endif
173
174	vmware_set_capabilities();
175}
176
177/*
178 * While checking the dmi string information, just checking the product
179 * serial key should be enough, as this will always have a VMware
180 * specific string when running under VMware hypervisor.
181 */
182static uint32_t __init vmware_platform(void)
183{
184	if (boot_cpu_has(X86_FEATURE_HYPERVISOR)) {
185		unsigned int eax;
186		unsigned int hyper_vendor_id[3];
187
188		cpuid(CPUID_VMWARE_INFO_LEAF, &eax, &hyper_vendor_id[0],
189		      &hyper_vendor_id[1], &hyper_vendor_id[2]);
190		if (!memcmp(hyper_vendor_id, "VMwareVMware", 12))
191			return CPUID_VMWARE_INFO_LEAF;
192	} else if (dmi_available && dmi_name_in_serial("VMware") &&
193		   __vmware_platform())
194		return 1;
195
196	return 0;
197}
198
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
199/* Checks if hypervisor supports x2apic without VT-D interrupt remapping. */
200static bool __init vmware_legacy_x2apic_available(void)
201{
202	uint32_t eax, ebx, ecx, edx;
203	VMWARE_PORT(GETVCPU_INFO, eax, ebx, ecx, edx);
204	return (eax & (1 << VMWARE_PORT_CMD_VCPU_RESERVED)) == 0 &&
205	       (eax & (1 << VMWARE_PORT_CMD_LEGACY_X2APIC)) != 0;
206}
207
208const __initconst struct hypervisor_x86 x86_hyper_vmware = {
209	.name			= "VMware",
210	.detect			= vmware_platform,
211	.type			= X86_HYPER_VMWARE,
212	.init.init_platform	= vmware_platform_setup,
213	.init.x2apic_available	= vmware_legacy_x2apic_available,
214};

  1/*
  2 * VMware Detection code.
  3 *
  4 * Copyright (C) 2008, VMware, Inc.
  5 * Author : Alok N Kataria <akataria@vmware.com>
  6 *
  7 * This program is free software; you can redistribute it and/or modify
  8 * it under the terms of the GNU General Public License as published by
  9 * the Free Software Foundation; either version 2 of the License, or
 10 * (at your option) any later version.
 11 *
 12 * This program is distributed in the hope that it will be useful, but
 13 * WITHOUT ANY WARRANTY; without even the implied warranty of
 14 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 15 * NON INFRINGEMENT.  See the GNU General Public License for more
 16 * details.
 17 *
 18 * You should have received a copy of the GNU General Public License
 19 * along with this program; if not, write to the Free Software
 20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 21 *
 22 */
 23
 24#include <linux/dmi.h>
 25#include <linux/init.h>
 26#include <linux/export.h>
 27#include <linux/clocksource.h>
 28#include <asm/div64.h>
 29#include <asm/x86_init.h>
 30#include <asm/hypervisor.h>
 31#include <asm/timer.h>
 32#include <asm/apic.h>
 33#include <asm/timer.h>
 34
 35#undef pr_fmt
 36#define pr_fmt(fmt)	"vmware: " fmt
 37
 38#define CPUID_VMWARE_INFO_LEAF	0x40000000
 39#define VMWARE_HYPERVISOR_MAGIC	0x564D5868
 40#define VMWARE_HYPERVISOR_PORT	0x5658
 41
 42#define VMWARE_PORT_CMD_GETVERSION	10
 43#define VMWARE_PORT_CMD_GETHZ		45
 44#define VMWARE_PORT_CMD_GETVCPU_INFO	68
 45#define VMWARE_PORT_CMD_LEGACY_X2APIC	3
 46#define VMWARE_PORT_CMD_VCPU_RESERVED	31
 47
 48#define VMWARE_PORT(cmd, eax, ebx, ecx, edx)				\
 49	__asm__("inl (%%dx)" :						\
 50			"=a"(eax), "=c"(ecx), "=d"(edx), "=b"(ebx) :	\
 51			"0"(VMWARE_HYPERVISOR_MAGIC),			\
 52			"1"(VMWARE_PORT_CMD_##cmd),			\
 53			"2"(VMWARE_HYPERVISOR_PORT), "3"(UINT_MAX) :	\
 54			"memory");
 55
 56static unsigned long vmware_tsc_khz __ro_after_init;
 57
 58static inline int __vmware_platform(void)
 59{
 60	uint32_t eax, ebx, ecx, edx;
 61	VMWARE_PORT(GETVERSION, eax, ebx, ecx, edx);
 62	return eax != (uint32_t)-1 && ebx == VMWARE_HYPERVISOR_MAGIC;
 63}
 64
 65static unsigned long vmware_get_tsc_khz(void)
 66{
 67	return vmware_tsc_khz;
 68}
 69
 70#ifdef CONFIG_PARAVIRT
 71static struct cyc2ns_data vmware_cyc2ns __ro_after_init;
 72static int vmw_sched_clock __initdata = 1;
 73
 74static __init int setup_vmw_sched_clock(char *s)
 75{
 76	vmw_sched_clock = 0;
 77	return 0;
 78}
 79early_param("no-vmw-sched-clock", setup_vmw_sched_clock);
 80
 81static unsigned long long vmware_sched_clock(void)
 82{
 83	unsigned long long ns;
 84
 85	ns = mul_u64_u32_shr(rdtsc(), vmware_cyc2ns.cyc2ns_mul,
 86			     vmware_cyc2ns.cyc2ns_shift);
 87	ns -= vmware_cyc2ns.cyc2ns_offset;
 88	return ns;
 89}
 90
 91static void __init vmware_sched_clock_setup(void)
 92{
 93	struct cyc2ns_data *d = &vmware_cyc2ns;
 94	unsigned long long tsc_now = rdtsc();
 95
 96	clocks_calc_mult_shift(&d->cyc2ns_mul, &d->cyc2ns_shift,
 97			       vmware_tsc_khz, NSEC_PER_MSEC, 0);
 98	d->cyc2ns_offset = mul_u64_u32_shr(tsc_now, d->cyc2ns_mul,
 99					   d->cyc2ns_shift);
100
101	pv_time_ops.sched_clock = vmware_sched_clock;
102	pr_info("using sched offset of %llu ns\n", d->cyc2ns_offset);
103}
104
105static void __init vmware_paravirt_ops_setup(void)
106{
107	pv_info.name = "VMware hypervisor";
108	pv_cpu_ops.io_delay = paravirt_nop;
109
110	if (vmware_tsc_khz && vmw_sched_clock)
111		vmware_sched_clock_setup();
112}
113#else
114#define vmware_paravirt_ops_setup() do {} while (0)
115#endif
116
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
117static void __init vmware_platform_setup(void)
118{
119	uint32_t eax, ebx, ecx, edx;
120	uint64_t lpj, tsc_khz;
121
122	VMWARE_PORT(GETHZ, eax, ebx, ecx, edx);
123
124	if (ebx != UINT_MAX) {
125		lpj = tsc_khz = eax | (((uint64_t)ebx) << 32);
126		do_div(tsc_khz, 1000);
127		WARN_ON(tsc_khz >> 32);
128		pr_info("TSC freq read from hypervisor : %lu.%03lu MHz\n",
129			(unsigned long) tsc_khz / 1000,
130			(unsigned long) tsc_khz % 1000);
131
132		if (!preset_lpj) {
133			do_div(lpj, HZ);
134			preset_lpj = lpj;
135		}
136
137		vmware_tsc_khz = tsc_khz;
138		x86_platform.calibrate_tsc = vmware_get_tsc_khz;
139		x86_platform.calibrate_cpu = vmware_get_tsc_khz;
140
141#ifdef CONFIG_X86_LOCAL_APIC
142		/* Skip lapic calibration since we know the bus frequency. */
143		lapic_timer_frequency = ecx / HZ;
144		pr_info("Host bus clock speed read from hypervisor : %u Hz\n",
145			ecx);
146#endif
147	} else {
148		pr_warn("Failed to get TSC freq from the hypervisor\n");
149	}
150
151	vmware_paravirt_ops_setup();
152
153#ifdef CONFIG_X86_IO_APIC
154	no_timer_check = 1;
155#endif
 
 
156}
157
158/*
159 * While checking the dmi string information, just checking the product
160 * serial key should be enough, as this will always have a VMware
161 * specific string when running under VMware hypervisor.
162 */
163static uint32_t __init vmware_platform(void)
164{
165	if (boot_cpu_has(X86_FEATURE_HYPERVISOR)) {
166		unsigned int eax;
167		unsigned int hyper_vendor_id[3];
168
169		cpuid(CPUID_VMWARE_INFO_LEAF, &eax, &hyper_vendor_id[0],
170		      &hyper_vendor_id[1], &hyper_vendor_id[2]);
171		if (!memcmp(hyper_vendor_id, "VMwareVMware", 12))
172			return CPUID_VMWARE_INFO_LEAF;
173	} else if (dmi_available && dmi_name_in_serial("VMware") &&
174		   __vmware_platform())
175		return 1;
176
177	return 0;
178}
179
180/*
181 * VMware hypervisor takes care of exporting a reliable TSC to the guest.
182 * Still, due to timing difference when running on virtual cpus, the TSC can
183 * be marked as unstable in some cases. For example, the TSC sync check at
184 * bootup can fail due to a marginal offset between vcpus' TSCs (though the
185 * TSCs do not drift from each other).  Also, the ACPI PM timer clocksource
186 * is not suitable as a watchdog when running on a hypervisor because the
187 * kernel may miss a wrap of the counter if the vcpu is descheduled for a
188 * long time. To skip these checks at runtime we set these capability bits,
189 * so that the kernel could just trust the hypervisor with providing a
190 * reliable virtual TSC that is suitable for timekeeping.
191 */
192static void vmware_set_cpu_features(struct cpuinfo_x86 *c)
193{
194	set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
195	set_cpu_cap(c, X86_FEATURE_TSC_RELIABLE);
196}
197
198/* Checks if hypervisor supports x2apic without VT-D interrupt remapping. */
199static bool __init vmware_legacy_x2apic_available(void)
200{
201	uint32_t eax, ebx, ecx, edx;
202	VMWARE_PORT(GETVCPU_INFO, eax, ebx, ecx, edx);
203	return (eax & (1 << VMWARE_PORT_CMD_VCPU_RESERVED)) == 0 &&
204	       (eax & (1 << VMWARE_PORT_CMD_LEGACY_X2APIC)) != 0;
205}
206
207const __refconst struct hypervisor_x86 x86_hyper_vmware = {
208	.name			= "VMware",
209	.detect			= vmware_platform,
210	.set_cpu_features	= vmware_set_cpu_features,
211	.init_platform		= vmware_platform_setup,
212	.x2apic_available	= vmware_legacy_x2apic_available,
213};
214EXPORT_SYMBOL(x86_hyper_vmware);