Differential D36467 Diff 112076 sys/dev/hyperv/vmbus/x86/hyperv_x86.c

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sys/dev/hyperv/vmbus/x86/hyperv_x86.c

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				/*- SPDX-License-Identifier: BSD-2-Clause-FreeBSD
				* Copyright (c) 2009-2012,2016-2017, 2022 Microsoft Corp.
				* Copyright (c) 2012 NetApp Inc.
				* Copyright (c) 2012 Citrix Inc.
				* All rights reserved.
				*
				* Redistribution and use in source and binary forms, with or without
				* modification, are permitted provided that the following conditions
				* are met:
				* 1. Redistributions of source code must retain the above copyright
				* notice unmodified, this list of conditions, and the following
				* disclaimer.
				* 2. Redistributions in binary form must reproduce the above copyright
				* notice, this list of conditions and the following disclaimer in the
				* documentation and/or other materials provided with the distribution.
				*
				* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
				* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
				* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
				* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
				* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
				* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
				* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
				* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
				* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
				* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
				*/

				/**
				* Implements low-level interactions with Hyper-V/Azure
				*/
				#include <sys/cdefs.h>
				__FBSDID("$FreeBSD$");

				#include <sys/param.h>
				#include <sys/systm.h>
				#include <sys/kernel.h>
				#include <sys/malloc.h>
				#include <sys/timetc.h>

				#include <vm/vm.h>
				#include <vm/pmap.h>
				#include <vm/vm_extern.h>
				#include <vm/vm_kern.h>

				#include <dev/hyperv/include/hyperv.h>
				#include <dev/hyperv/include/hyperv_busdma.h>
				#include <dev/hyperv/vmbus/hyperv_var.h>
				#include <dev/hyperv/vmbus/x86/hyperv_machdep.h>
				#include <dev/hyperv/vmbus/x86/hyperv_reg.h>

				#define HYPERV_FREEBSD_BUILD 0ULL
				#define HYPERV_FREEBSD_VERSION ((uint64_t)__FreeBSD_version)
				#define HYPERV_FREEBSD_OSID 0ULL

				void hyperv_init_tc(void);
				int hypercall_page_setup(vm_paddr_t);
				void hypercall_disable(void);
				bool hyperv_identify_features(void);

				u_int hyperv_ver_major;
				u_int hyperv_features;
				u_int hyperv_recommends;

				hyperv_tc64_t hyperv_tc64;

				static u_int hyperv_pm_features;
				static u_int hyperv_features3;
				static u_int hyperv_get_timecount(struct timecounter *);

				static struct timecounter hyperv_timecounter = {
				.tc_get_timecount = hyperv_get_timecount,
				.tc_poll_pps = NULL,
				.tc_counter_mask = 0xffffffff,
				.tc_frequency = HYPERV_TIMER_FREQ,
				.tc_name = "Hyper-V",
				.tc_quality = 2000,
				.tc_flags = 0,
				.tc_priv = NULL
				};

				static u_int
				hyperv_get_timecount(struct timecounter *tc __unused)
				{
				return rdmsr(MSR_HV_TIME_REF_COUNT);
				}

				static uint64_t
				hyperv_tc64_rdmsr(void)
				{

				return (rdmsr(MSR_HV_TIME_REF_COUNT));
				}

				void
				hyperv_init_tc(void)
				{
				if (hyperv_features & CPUID_HV_MSR_TIME_REFCNT) {
				/*
				* Register Hyper-V timecounter. This should be done as early
				* as possible to let DELAY() work, since the 8254 PIT is not
				* reliably emulated or even available.
				*/
				tc_init(&hyperv_timecounter);

				/*
				* Install 64 bits timecounter method for other modules
				* to use.
				*/
				hyperv_tc64 = hyperv_tc64_rdmsr;
				}
				}

				int
				hypercall_page_setup(vm_paddr_t paddr)
				{
				uint64_t hc, hc_orig;
				hc_orig = rdmsr(MSR_HV_HYPERCALL);

				/*
				* Setup the Hypercall page.
				*
				* NOTE: 'reserved' bits MUST be preserved.
				*/
				hc = ((paddr >> PAGE_SHIFT) << MSR_HV_HYPERCALL_PGSHIFT) \|
				(hc_orig & MSR_HV_HYPERCALL_RSVD_MASK) \| MSR_HV_HYPERCALL_ENABLE;
				wrmsr(MSR_HV_HYPERCALL, hc);

				/*
				* Confirm that Hypercall page did get setup.
				*/
				hc = rdmsr(MSR_HV_HYPERCALL);
				if ((hc & MSR_HV_HYPERCALL_ENABLE) == 0) {
				printf("hyperv: Hypercall setup failed\n");
				/* Can't perform any Hyper-V specific actions */
				vm_guest = VM_GUEST_VM;
				return (-1);
				}
				return (0);
				}

				void
				hypercall_disable(void)
				{
				uint64_t hc;
				/* Disable Hypercall */
				hc = rdmsr(MSR_HV_HYPERCALL);
				wrmsr(MSR_HV_HYPERCALL, (hc & MSR_HV_HYPERCALL_RSVD_MASK));
				}

				bool
				hyperv_identify_features(void)
				{
				u_int regs[4];
				unsigned int maxleaf;

				if (vm_guest != VM_GUEST_HV)
				return (false);

				do_cpuid(CPUID_LEAF_HV_MAXLEAF, regs);
				maxleaf = regs[0];
				if (maxleaf < CPUID_LEAF_HV_LIMITS)
				return (false);

				do_cpuid(CPUID_LEAF_HV_INTERFACE, regs);
				if (regs[0] != CPUID_HV_IFACE_HYPERV)
				return (false);

				do_cpuid(CPUID_LEAF_HV_FEATURES, regs);
				if ((regs[0] & CPUID_HV_MSR_HYPERCALL) == 0) {
				/*
				* Hyper-V w/o Hypercall is impossible; someone
				* is faking Hyper-V.
				*/
				return (false);
				}
				hyperv_features = regs[0];
				hyperv_pm_features = regs[2];
				hyperv_features3 = regs[3];
				do_cpuid(CPUID_LEAF_HV_IDENTITY, regs);
				hyperv_ver_major = regs[1] >> 16;
				printf("Hyper-V Version: %d.%d.%d [SP%d]\n", hyperv_ver_major,
				regs[1] & 0xffff, regs[0], regs[2]);

				printf(" Features=0x%b\n", hyperv_features,
				"\020"
				"\001VPRUNTIME" /* MSR_HV_VP_RUNTIME */
				"\002TMREFCNT" /* MSR_HV_TIME_REF_COUNT */
				"\003SYNIC" /* MSRs for SynIC */
				"\004SYNTM" /* MSRs for SynTimer */
				"\005APIC" /* MSR_HV_{EOI,ICR,TPR} */
				"\006HYPERCALL" /* MSR_HV_{GUEST_OS_ID,HYPERCALL} */
				"\007VPINDEX" /* MSR_HV_VP_INDEX */
				"\010RESET" /* MSR_HV_RESET */
				"\011STATS" /* MSR_HV_STATS_ */
				"\012REFTSC" /* MSR_HV_REFERENCE_TSC */
				"\013IDLE" /* MSR_HV_GUEST_IDLE */
				"\014TMFREQ" /* MSR_HV_{TSC,APIC}_FREQUENCY */
				"\015DEBUG"); /* MSR_HV_SYNTH_DEBUG_ */
				printf(" PM Features=0x%b [C%u]\n",
				(hyperv_pm_features & ~CPUPM_HV_CSTATE_MASK),
				"\020"
				"\005C3HPET", /* HPET is required for C3 state */
				CPUPM_HV_CSTATE(hyperv_pm_features));
				printf(" Features3=0x%b\n", hyperv_features3,
				"\020"
				"\001MWAIT" /* MWAIT */
				"\002DEBUG" /* guest debug support */
				"\003PERFMON" /* performance monitor */
				"\004PCPUDPE" /* physical CPU dynamic partition event */
				"\005XMMHC" /* hypercall input through XMM regs */
				"\006IDLE" /* guest idle support */
				"\007SLEEP" /* hypervisor sleep support */
				"\010NUMA" /* NUMA distance query support */
				"\011TMFREQ" /* timer frequency query (TSC, LAPIC) */
				"\012SYNCMC" /* inject synthetic machine checks */
				"\013CRASH" /* MSRs for guest crash */
				"\014DEBUGMSR" /* MSRs for guest debug */
				"\015NPIEP" /* NPIEP */
				"\016HVDIS"); /* disabling hypervisor */

				do_cpuid(CPUID_LEAF_HV_RECOMMENDS, regs);
				hyperv_recommends = regs[0];
				if (bootverbose)
				printf(" Recommends: %08x %08x\n", regs[0], regs[1]);

				do_cpuid(CPUID_LEAF_HV_LIMITS, regs);
				if (bootverbose) {
				printf(" Limits: Vcpu:%d Lcpu:%d Int:%d\n", regs[0], regs[1],
				regs[2]);
				}

				if (maxleaf >= CPUID_LEAF_HV_HWFEATURES) {
				do_cpuid(CPUID_LEAF_HV_HWFEATURES, regs);
				if (bootverbose) {
				printf(" HW Features: %08x, AMD: %08x\n", regs[0],
				regs[3]);
				}
				}
				return (true);
				}