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240 lines
7 KiB
C
240 lines
7 KiB
C
/*- SPDX-License-Identifier: BSD-2-Clause
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* Copyright (c) 2009-2012,2016-2017, 2022 Microsoft Corp.
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* Copyright (c) 2012 NetApp Inc.
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* Copyright (c) 2012 Citrix Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* Implements low-level interactions with Hyper-V/Azure
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/timetc.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_kern.h>
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#include <dev/hyperv/include/hyperv.h>
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#include <dev/hyperv/include/hyperv_busdma.h>
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#include <dev/hyperv/vmbus/hyperv_var.h>
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#include <dev/hyperv/vmbus/x86/hyperv_machdep.h>
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#include <dev/hyperv/vmbus/x86/hyperv_reg.h>
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#include <dev/hyperv/vmbus/hyperv_common_reg.h>
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#define HYPERV_FREEBSD_BUILD 0ULL
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#define HYPERV_FREEBSD_VERSION ((uint64_t)__FreeBSD_version)
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#define HYPERV_FREEBSD_OSID 0ULL
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void hyperv_init_tc(void);
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int hypercall_page_setup(vm_paddr_t);
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void hypercall_disable(void);
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bool hyperv_identify_features(void);
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u_int hyperv_ver_major;
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u_int hyperv_features;
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u_int hyperv_recommends;
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hyperv_tc64_t hyperv_tc64;
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static u_int hyperv_pm_features;
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static u_int hyperv_features3;
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static u_int hyperv_get_timecount(struct timecounter *);
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static struct timecounter hyperv_timecounter = {
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.tc_get_timecount = hyperv_get_timecount,
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.tc_poll_pps = NULL,
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.tc_counter_mask = 0xffffffff,
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.tc_frequency = HYPERV_TIMER_FREQ,
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.tc_name = "Hyper-V",
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.tc_quality = 2000,
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.tc_flags = 0,
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.tc_priv = NULL
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};
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static u_int
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hyperv_get_timecount(struct timecounter *tc __unused)
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{
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return rdmsr(MSR_HV_TIME_REF_COUNT);
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}
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static uint64_t
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hyperv_tc64_rdmsr(void)
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{
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return (rdmsr(MSR_HV_TIME_REF_COUNT));
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}
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void
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hyperv_init_tc(void)
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{
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if (hyperv_features & CPUID_HV_MSR_TIME_REFCNT) {
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/*
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* Register Hyper-V timecounter. This should be done as early
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* as possible to let DELAY() work, since the 8254 PIT is not
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* reliably emulated or even available.
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*/
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tc_init(&hyperv_timecounter);
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/*
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* Install 64 bits timecounter method for other modules
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* to use.
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*/
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hyperv_tc64 = hyperv_tc64_rdmsr;
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}
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}
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int
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hypercall_page_setup(vm_paddr_t paddr)
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{
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uint64_t hc, hc_orig;
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hc_orig = rdmsr(MSR_HV_HYPERCALL);
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/*
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* Setup the Hypercall page.
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*
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* NOTE: 'reserved' bits MUST be preserved.
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*/
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hc = ((paddr >> PAGE_SHIFT) << MSR_HV_HYPERCALL_PGSHIFT) |
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(hc_orig & MSR_HV_HYPERCALL_RSVD_MASK) | MSR_HV_HYPERCALL_ENABLE;
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wrmsr(MSR_HV_HYPERCALL, hc);
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/*
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* Confirm that Hypercall page did get setup.
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*/
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hc = rdmsr(MSR_HV_HYPERCALL);
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if ((hc & MSR_HV_HYPERCALL_ENABLE) == 0) {
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printf("hyperv: Hypercall setup failed\n");
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/* Can't perform any Hyper-V specific actions */
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vm_guest = VM_GUEST_VM;
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return (-1);
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}
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return (0);
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}
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void
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hypercall_disable(void)
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{
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uint64_t hc;
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/* Disable Hypercall */
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hc = rdmsr(MSR_HV_HYPERCALL);
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wrmsr(MSR_HV_HYPERCALL, (hc & MSR_HV_HYPERCALL_RSVD_MASK));
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}
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bool
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hyperv_identify_features(void)
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{
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u_int regs[4];
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unsigned int maxleaf;
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if (vm_guest != VM_GUEST_HV)
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return (false);
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do_cpuid(CPUID_LEAF_HV_MAXLEAF, regs);
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maxleaf = regs[0];
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if (maxleaf < CPUID_LEAF_HV_LIMITS)
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return (false);
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do_cpuid(CPUID_LEAF_HV_INTERFACE, regs);
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if (regs[0] != CPUID_HV_IFACE_HYPERV)
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return (false);
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do_cpuid(CPUID_LEAF_HV_FEATURES, regs);
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if ((regs[0] & CPUID_HV_MSR_HYPERCALL) == 0) {
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/*
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* Hyper-V w/o Hypercall is impossible; someone
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* is faking Hyper-V.
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*/
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return (false);
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}
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hyperv_features = regs[0];
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hyperv_pm_features = regs[2];
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hyperv_features3 = regs[3];
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do_cpuid(CPUID_LEAF_HV_IDENTITY, regs);
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hyperv_ver_major = regs[1] >> 16;
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printf("Hyper-V Version: %d.%d.%d [SP%d]\n", hyperv_ver_major,
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regs[1] & 0xffff, regs[0], regs[2]);
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printf(" Features=0x%b\n", hyperv_features,
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"\020"
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"\001VPRUNTIME" /* MSR_HV_VP_RUNTIME */
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"\002TMREFCNT" /* MSR_HV_TIME_REF_COUNT */
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"\003SYNIC" /* MSRs for SynIC */
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"\004SYNTM" /* MSRs for SynTimer */
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"\005APIC" /* MSR_HV_{EOI,ICR,TPR} */
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"\006HYPERCALL" /* MSR_HV_{GUEST_OS_ID,HYPERCALL} */
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"\007VPINDEX" /* MSR_HV_VP_INDEX */
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"\010RESET" /* MSR_HV_RESET */
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"\011STATS" /* MSR_HV_STATS_ */
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"\012REFTSC" /* MSR_HV_REFERENCE_TSC */
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"\013IDLE" /* MSR_HV_GUEST_IDLE */
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"\014TMFREQ" /* MSR_HV_{TSC,APIC}_FREQUENCY */
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"\015DEBUG"); /* MSR_HV_SYNTH_DEBUG_ */
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printf(" PM Features=0x%b [C%u]\n",
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(hyperv_pm_features & ~CPUPM_HV_CSTATE_MASK),
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"\020"
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"\005C3HPET", /* HPET is required for C3 state */
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CPUPM_HV_CSTATE(hyperv_pm_features));
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printf(" Features3=0x%b\n", hyperv_features3,
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"\020"
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"\001MWAIT" /* MWAIT */
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"\002DEBUG" /* guest debug support */
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"\003PERFMON" /* performance monitor */
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"\004PCPUDPE" /* physical CPU dynamic partition event */
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"\005XMMHC" /* hypercall input through XMM regs */
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"\006IDLE" /* guest idle support */
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"\007SLEEP" /* hypervisor sleep support */
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"\010NUMA" /* NUMA distance query support */
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"\011TMFREQ" /* timer frequency query (TSC, LAPIC) */
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"\012SYNCMC" /* inject synthetic machine checks */
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"\013CRASH" /* MSRs for guest crash */
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"\014DEBUGMSR" /* MSRs for guest debug */
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"\015NPIEP" /* NPIEP */
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"\016HVDIS"); /* disabling hypervisor */
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do_cpuid(CPUID_LEAF_HV_RECOMMENDS, regs);
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hyperv_recommends = regs[0];
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if (bootverbose)
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printf(" Recommends: %08x %08x\n", regs[0], regs[1]);
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do_cpuid(CPUID_LEAF_HV_LIMITS, regs);
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if (bootverbose) {
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printf(" Limits: Vcpu:%d Lcpu:%d Int:%d\n", regs[0], regs[1],
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regs[2]);
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}
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if (maxleaf >= CPUID_LEAF_HV_HWFEATURES) {
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do_cpuid(CPUID_LEAF_HV_HWFEATURES, regs);
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if (bootverbose) {
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printf(" HW Features: %08x, AMD: %08x\n", regs[0],
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regs[3]);
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}
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}
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return (true);
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}
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