215 lines
6.2 KiB
C
215 lines
6.2 KiB
C
/*
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* VMware Detection code.
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*
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* Copyright (C) 2008, VMware, Inc.
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* Author : Alok N Kataria <akataria@vmware.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <linux/dmi.h>
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#include <linux/init.h>
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#include <linux/export.h>
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#include <linux/clocksource.h>
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#include <asm/div64.h>
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#include <asm/x86_init.h>
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#include <asm/hypervisor.h>
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#include <asm/timer.h>
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#include <asm/apic.h>
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#undef pr_fmt
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#define pr_fmt(fmt) "vmware: " fmt
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#define CPUID_VMWARE_INFO_LEAF 0x40000000
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#define VMWARE_HYPERVISOR_MAGIC 0x564D5868
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#define VMWARE_HYPERVISOR_PORT 0x5658
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#define VMWARE_PORT_CMD_GETVERSION 10
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#define VMWARE_PORT_CMD_GETHZ 45
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#define VMWARE_PORT_CMD_GETVCPU_INFO 68
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#define VMWARE_PORT_CMD_LEGACY_X2APIC 3
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#define VMWARE_PORT_CMD_VCPU_RESERVED 31
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#define VMWARE_PORT(cmd, eax, ebx, ecx, edx) \
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__asm__("inl (%%dx)" : \
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"=a"(eax), "=c"(ecx), "=d"(edx), "=b"(ebx) : \
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"0"(VMWARE_HYPERVISOR_MAGIC), \
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"1"(VMWARE_PORT_CMD_##cmd), \
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"2"(VMWARE_HYPERVISOR_PORT), "3"(UINT_MAX) : \
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"memory");
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static unsigned long vmware_tsc_khz __ro_after_init;
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static inline int __vmware_platform(void)
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{
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uint32_t eax, ebx, ecx, edx;
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VMWARE_PORT(GETVERSION, eax, ebx, ecx, edx);
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return eax != (uint32_t)-1 && ebx == VMWARE_HYPERVISOR_MAGIC;
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}
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static unsigned long vmware_get_tsc_khz(void)
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{
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return vmware_tsc_khz;
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}
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#ifdef CONFIG_PARAVIRT
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static struct cyc2ns_data vmware_cyc2ns __ro_after_init;
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static int vmw_sched_clock __initdata = 1;
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static __init int setup_vmw_sched_clock(char *s)
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{
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vmw_sched_clock = 0;
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return 0;
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}
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early_param("no-vmw-sched-clock", setup_vmw_sched_clock);
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static unsigned long long notrace vmware_sched_clock(void)
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{
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unsigned long long ns;
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ns = mul_u64_u32_shr(rdtsc(), vmware_cyc2ns.cyc2ns_mul,
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vmware_cyc2ns.cyc2ns_shift);
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ns -= vmware_cyc2ns.cyc2ns_offset;
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return ns;
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}
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static void __init vmware_sched_clock_setup(void)
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{
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struct cyc2ns_data *d = &vmware_cyc2ns;
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unsigned long long tsc_now = rdtsc();
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clocks_calc_mult_shift(&d->cyc2ns_mul, &d->cyc2ns_shift,
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vmware_tsc_khz, NSEC_PER_MSEC, 0);
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d->cyc2ns_offset = mul_u64_u32_shr(tsc_now, d->cyc2ns_mul,
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d->cyc2ns_shift);
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pv_time_ops.sched_clock = vmware_sched_clock;
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pr_info("using sched offset of %llu ns\n", d->cyc2ns_offset);
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}
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static void __init vmware_paravirt_ops_setup(void)
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{
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pv_info.name = "VMware hypervisor";
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pv_cpu_ops.io_delay = paravirt_nop;
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if (vmware_tsc_khz && vmw_sched_clock)
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vmware_sched_clock_setup();
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}
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#else
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#define vmware_paravirt_ops_setup() do {} while (0)
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#endif
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/*
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* VMware hypervisor takes care of exporting a reliable TSC to the guest.
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* Still, due to timing difference when running on virtual cpus, the TSC can
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* be marked as unstable in some cases. For example, the TSC sync check at
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* bootup can fail due to a marginal offset between vcpus' TSCs (though the
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* TSCs do not drift from each other). Also, the ACPI PM timer clocksource
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* is not suitable as a watchdog when running on a hypervisor because the
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* kernel may miss a wrap of the counter if the vcpu is descheduled for a
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* long time. To skip these checks at runtime we set these capability bits,
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* so that the kernel could just trust the hypervisor with providing a
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* reliable virtual TSC that is suitable for timekeeping.
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*/
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static void __init vmware_set_capabilities(void)
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{
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setup_force_cpu_cap(X86_FEATURE_CONSTANT_TSC);
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setup_force_cpu_cap(X86_FEATURE_TSC_RELIABLE);
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}
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static void __init vmware_platform_setup(void)
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{
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uint32_t eax, ebx, ecx, edx;
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uint64_t lpj, tsc_khz;
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VMWARE_PORT(GETHZ, eax, ebx, ecx, edx);
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if (ebx != UINT_MAX) {
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lpj = tsc_khz = eax | (((uint64_t)ebx) << 32);
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do_div(tsc_khz, 1000);
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WARN_ON(tsc_khz >> 32);
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pr_info("TSC freq read from hypervisor : %lu.%03lu MHz\n",
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(unsigned long) tsc_khz / 1000,
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(unsigned long) tsc_khz % 1000);
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if (!preset_lpj) {
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do_div(lpj, HZ);
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preset_lpj = lpj;
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}
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vmware_tsc_khz = tsc_khz;
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x86_platform.calibrate_tsc = vmware_get_tsc_khz;
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x86_platform.calibrate_cpu = vmware_get_tsc_khz;
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#ifdef CONFIG_X86_LOCAL_APIC
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/* Skip lapic calibration since we know the bus frequency. */
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lapic_timer_frequency = ecx / HZ;
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pr_info("Host bus clock speed read from hypervisor : %u Hz\n",
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ecx);
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#endif
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} else {
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pr_warn("Failed to get TSC freq from the hypervisor\n");
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}
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vmware_paravirt_ops_setup();
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#ifdef CONFIG_X86_IO_APIC
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no_timer_check = 1;
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#endif
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vmware_set_capabilities();
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}
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/*
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* While checking the dmi string information, just checking the product
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* serial key should be enough, as this will always have a VMware
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* specific string when running under VMware hypervisor.
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*/
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static uint32_t __init vmware_platform(void)
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{
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if (boot_cpu_has(X86_FEATURE_HYPERVISOR)) {
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unsigned int eax;
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unsigned int hyper_vendor_id[3];
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cpuid(CPUID_VMWARE_INFO_LEAF, &eax, &hyper_vendor_id[0],
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&hyper_vendor_id[1], &hyper_vendor_id[2]);
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if (!memcmp(hyper_vendor_id, "VMwareVMware", 12))
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return CPUID_VMWARE_INFO_LEAF;
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} else if (dmi_available && dmi_name_in_serial("VMware") &&
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__vmware_platform())
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return 1;
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return 0;
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}
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/* Checks if hypervisor supports x2apic without VT-D interrupt remapping. */
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static bool __init vmware_legacy_x2apic_available(void)
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{
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uint32_t eax, ebx, ecx, edx;
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VMWARE_PORT(GETVCPU_INFO, eax, ebx, ecx, edx);
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return (eax & (1 << VMWARE_PORT_CMD_VCPU_RESERVED)) == 0 &&
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(eax & (1 << VMWARE_PORT_CMD_LEGACY_X2APIC)) != 0;
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}
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const __initconst struct hypervisor_x86 x86_hyper_vmware = {
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.name = "VMware",
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.detect = vmware_platform,
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.type = X86_HYPER_VMWARE,
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.init.init_platform = vmware_platform_setup,
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.init.x2apic_available = vmware_legacy_x2apic_available,
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};
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