/* * VMware Detection 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/dmi.h>#include <linux/module.h>#include <asm/div64.h>#include <asm/x86_init.h>#include <asm/hypervisor.h> #define CPUID_VMWARE_INFO_LEAF	0x40000000#define VMWARE_HYPERVISOR_MAGIC	0x564D5868#define VMWARE_HYPERVISOR_PORT	0x5658 #define VMWARE_PORT_CMD_GETVERSION	10#define VMWARE_PORT_CMD_GETHZ		45#define VMWARE_PORT_CMD_GETVCPU_INFO	68#define VMWARE_PORT_CMD_LEGACY_X2APIC	3#define VMWARE_PORT_CMD_VCPU_RESERVED	31 #define VMWARE_PORT(cmd, eax, ebx, ecx, edx)				\	__asm__("inl (%%dx)" :						\			"=a"(eax), "=c"(ecx), "=d"(edx), "=b"(ebx) :	\			"0"(VMWARE_HYPERVISOR_MAGIC),			\			"1"(VMWARE_PORT_CMD_##cmd),			\			"2"(VMWARE_HYPERVISOR_PORT), "3"(UINT_MAX) :	\			"memory"); static inline int __vmware_platform(void){	uint32_t eax, ebx, ecx, edx;	VMWARE_PORT(GETVERSION, eax, ebx, ecx, edx);	return eax != (uint32_t)-1 && ebx == VMWARE_HYPERVISOR_MAGIC;} static unsigned long vmware_get_tsc_khz(void){	uint64_t tsc_hz, lpj;	uint32_t eax, ebx, ecx, edx; 	VMWARE_PORT(GETHZ, eax, ebx, ecx, edx); 	tsc_hz = eax | (((uint64_t)ebx) << 32);	do_div(tsc_hz, 1000);	BUG_ON(tsc_hz >> 32);	printk(KERN_INFO "TSC freq read from hypervisor : %lu.%03lu MHz\n",			 (unsigned long) tsc_hz / 1000,			 (unsigned long) tsc_hz % 1000); 	if (!preset_lpj) {		lpj = ((u64)tsc_hz * 1000);		do_div(lpj, HZ);		preset_lpj = lpj;	} 	return tsc_hz;} static void __init vmware_platform_setup(void){	uint32_t eax, ebx, ecx, edx; 	VMWARE_PORT(GETHZ, eax, ebx, ecx, edx); 	if (ebx != UINT_MAX)		x86_platform.calibrate_tsc = vmware_get_tsc_khz;	else		printk(KERN_WARNING		       "Failed to get TSC freq from the hypervisor\n");} /* * While checking the dmi string information, just checking the product * serial key should be enough, as this will always have a VMware * specific string when running under VMware hypervisor. */static uint32_t __init vmware_platform(void){	if (cpu_has_hypervisor) {		unsigned int eax;		unsigned int hyper_vendor_id[3]; 		cpuid(CPUID_VMWARE_INFO_LEAF, &eax, &hyper_vendor_id[0],		      &hyper_vendor_id[1], &hyper_vendor_id[2]);		if (!memcmp(hyper_vendor_id, "VMwareVMware", 12))			return CPUID_VMWARE_INFO_LEAF;	} else if (dmi_available && dmi_name_in_serial("VMware") &&		   __vmware_platform())		return 1; 	return 0;} /* * VMware hypervisor takes care of exporting a reliable TSC to the guest. * Still, due to timing difference when running on virtual cpus, the TSC can * be marked as unstable in some cases. For example, the TSC sync check at * bootup can fail due to a marginal offset between vcpus' TSCs (though the * TSCs do not drift from each other).  Also, the ACPI PM timer clocksource * is not suitable as a watchdog when running on a hypervisor because the * kernel may miss a wrap of the counter if the vcpu is descheduled for a * long time. To skip these checks at runtime we set these capability bits, * so that the kernel could just trust the hypervisor with providing a * reliable virtual TSC that is suitable for timekeeping. */static void vmware_set_cpu_features(struct cpuinfo_x86 *c){	set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);	set_cpu_cap(c, X86_FEATURE_TSC_RELIABLE);} /* Checks if hypervisor supports x2apic without VT-D interrupt remapping. */static bool __init vmware_legacy_x2apic_available(void){	uint32_t eax, ebx, ecx, edx;	VMWARE_PORT(GETVCPU_INFO, eax, ebx, ecx, edx);	return (eax & (1 << VMWARE_PORT_CMD_VCPU_RESERVED)) == 0 &&	       (eax & (1 << VMWARE_PORT_CMD_LEGACY_X2APIC)) != 0;} const __refconst struct hypervisor_x86 x86_hyper_vmware = {	.name			= "VMware",	.detect			= vmware_platform,	.set_cpu_features	= vmware_set_cpu_features,	.init_platform		= vmware_platform_setup,	.x2apic_available	= vmware_legacy_x2apic_available,};EXPORT_SYMBOL(x86_hyper_vmware);