122 lines
3.8 KiB
C
122 lines
3.8 KiB
C
/*
|
|
* 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 <asm/div64.h>
|
|
#include <asm/vmware.h>
|
|
#include <asm/x86_init.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, 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;
|
|
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);
|
|
return tsc_hz;
|
|
}
|
|
|
|
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 infomation, just checking the product
|
|
* serial key should be enough, as this will always have a VMware
|
|
* specific string when running under VMware hypervisor.
|
|
*/
|
|
int vmware_platform(void)
|
|
{
|
|
if (cpu_has_hypervisor) {
|
|
unsigned int eax, ebx, ecx, edx;
|
|
char hyper_vendor_id[13];
|
|
|
|
cpuid(CPUID_VMWARE_INFO_LEAF, &eax, &ebx, &ecx, &edx);
|
|
memcpy(hyper_vendor_id + 0, &ebx, 4);
|
|
memcpy(hyper_vendor_id + 4, &ecx, 4);
|
|
memcpy(hyper_vendor_id + 8, &edx, 4);
|
|
hyper_vendor_id[12] = '\0';
|
|
if (!strcmp(hyper_vendor_id, "VMwareVMware"))
|
|
return 1;
|
|
} 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.
|
|
*/
|
|
void __cpuinit vmware_set_feature_bits(struct cpuinfo_x86 *c)
|
|
{
|
|
set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
|
|
set_cpu_cap(c, X86_FEATURE_TSC_RELIABLE);
|
|
}
|