[apple/xnu.git] / osfmk / i386 / vmx / vmx_cpu.c

/*
 * Copyright (c) 2006 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */

#include <pexpert/pexpert.h>
#include <i386/cpuid.h>
#include <i386/cpu_data.h>
#include <i386/mp.h>
#include <i386/proc_reg.h>
#include <i386/vmx.h>
#include <i386/vmx/vmx_asm.h>
#include <i386/vmx/vmx_shims.h>
#include <i386/vmx/vmx_cpu.h>
#include <i386/mtrr.h>
#include <mach/mach_host.h>             /* for host_info() */

#define VMX_KPRINTF(x...) /* kprintf("vmx: " x) */

int vmx_use_count = 0;
boolean_t vmx_exclusive = FALSE;
decl_simple_lock_data(static,vmx_use_count_lock)

/* -----------------------------------------------------------------------------
   vmx_is_available()
	Is the VMX facility available on this CPU?
   -------------------------------------------------------------------------- */
static inline boolean_t
vmx_is_available(void)
{
	return (0 != (cpuid_features() & CPUID_FEATURE_VMX));
}

/* -----------------------------------------------------------------------------
   vmxon_is_enabled()
	Is the VMXON instruction enabled on this CPU?
   -------------------------------------------------------------------------- */
static inline boolean_t
vmxon_is_enabled(void)
{
	return (vmx_is_available() &&
		(rdmsr64(MSR_IA32_FEATURE_CONTROL) & MSR_IA32_FEATCTL_VMXON));
}

/* -----------------------------------------------------------------------------
   vmx_is_cr0_valid()
	Is CR0 valid for executing VMXON on this CPU?
   -------------------------------------------------------------------------- */
static inline boolean_t
vmx_is_cr0_valid(vmx_specs_t *specs)
{
	uintptr_t cr0 = get_cr0();
	return (0 == ((~cr0 & specs->cr0_fixed_0)|(cr0 & ~specs->cr0_fixed_1)));
}

/* -----------------------------------------------------------------------------
   vmx_is_cr4_valid()
	Is CR4 valid for executing VMXON on this CPU?
   -------------------------------------------------------------------------- */
static inline boolean_t
vmx_is_cr4_valid(vmx_specs_t *specs)
{
	uintptr_t cr4 = get_cr4();
	return (0 == ((~cr4 & specs->cr4_fixed_0)|(cr4 & ~specs->cr4_fixed_1)));
}

static void
vmx_init(void)
{
	uint64_t msr_image;

	if (!vmx_is_available())
		return;

	/*
	 * We don't count on EFI initializing MSR_IA32_FEATURE_CONTROL
	 * and turning VMXON on and locking the bit, so we do that now.
	 */
	msr_image = rdmsr64(MSR_IA32_FEATURE_CONTROL);
	if (0 == ((msr_image & MSR_IA32_FEATCTL_LOCK)))
		wrmsr64(MSR_IA32_FEATURE_CONTROL,
			(msr_image |
			 MSR_IA32_FEATCTL_VMXON |
			 MSR_IA32_FEATCTL_LOCK));
}

/* -----------------------------------------------------------------------------
   vmx_get_specs()
	Obtain VMX facility specifications for this CPU and
	enter them into the vmx_specs_t structure. If VMX is not available or
	disabled on this CPU, set vmx_present to false and return leaving
	the remainder of the vmx_specs_t uninitialized. 
   -------------------------------------------------------------------------- */
void
vmx_get_specs()
{
	vmx_specs_t *specs = &current_cpu_datap()->cpu_vmx.specs;
	uint64_t msr_image;
	
	/* this is called once for every CPU, but the lock doesn't care :-) */
	simple_lock_init(&vmx_use_count_lock, 0);

	vmx_init();

	/*
	 * if we have read the data on boot, we won't read it
	 *  again on wakeup, otherwise *bad* things will happen
	 */
	if (specs->initialized)
		return;
	else
		specs->initialized = TRUE;

	/* See if VMX is present, return if it is not */
	specs->vmx_present = vmx_is_available() && vmxon_is_enabled();
	if (!specs->vmx_present)
		return;

#define bitfield(x,f)	((x >> f##_BIT) & f##_MASK)
	/* Obtain and decode VMX general capabilities */	
	msr_image = rdmsr64(MSR_IA32_VMX_BASIC);
	specs->vmcs_id       = (uint32_t)(msr_image & VMX_VCR_VMCS_REV_ID);
	specs->vmcs_mem_type = bitfield(msr_image, VMX_VCR_VMCS_MEM_TYPE) != 0;
	specs->vmcs_size = bitfield(msr_image, VMX_VCR_VMCS_SIZE);
							  
	/* Obtain allowed settings for pin-based execution controls */
	msr_image = rdmsr64(MSR_IA32_VMXPINBASED_CTLS);
	specs->pin_exctls_0 = (uint32_t)(msr_image & 0xFFFFFFFF);
	specs->pin_exctls_1 = (uint32_t)(msr_image >> 32);
	
	/* Obtain allowed settings for processor-based execution controls */
	msr_image = rdmsr64(MSR_IA32_PROCBASED_CTLS);
	specs->proc_exctls_0 = (uint32_t)(msr_image & 0xFFFFFFFF);
	specs->proc_exctls_1 = (uint32_t)(msr_image >> 32);
	
	/* Obtain allowed settings for VM-exit controls */
	msr_image = rdmsr64(MSR_IA32_VMX_EXIT_CTLS);
	specs->exit_ctls_0 = (uint32_t)(msr_image & 0xFFFFFFFF);
	specs->exit_ctls_1 = (uint32_t)(msr_image >> 32);
	
	/* Obtain allowed settings for VM-entry controls */
	msr_image = rdmsr64(MSR_IA32_VMX_ENTRY_CTLS);
	specs->enter_ctls_0 = (uint32_t)(msr_image & 0xFFFFFFFF);
	specs->enter_ctls_0 = (uint32_t)(msr_image >> 32);
	
	/* Obtain and decode miscellaneous capabilities */
	msr_image = rdmsr64(MSR_IA32_VMX_MISC);
	specs->act_halt     = bitfield(msr_image, VMX_VCR_ACT_HLT) != 0;
	specs->act_shutdown = bitfield(msr_image, VMX_VCR_ACT_SHUTDOWN) != 0;
	specs->act_SIPI     = bitfield(msr_image, VMX_VCR_ACT_SIPI) != 0;
	specs->act_CSTATE   = bitfield(msr_image, VMX_VCR_ACT_CSTATE) != 0;
	specs->cr3_targs    = bitfield(msr_image, VMX_VCR_CR3_TARGS);
	specs->max_msrs     = (uint32_t)(512 * (1 + bitfield(msr_image, VMX_VCR_MAX_MSRS)));
	specs->mseg_id      = (uint32_t)bitfield(msr_image, VMX_VCR_MSEG_ID);
	
	/* Obtain VMX-fixed bits in CR0 */
	specs->cr0_fixed_0 = (uint32_t)rdmsr64(MSR_IA32_VMX_CR0_FIXED0) & 0xFFFFFFFF;
	specs->cr0_fixed_1 = (uint32_t)rdmsr64(MSR_IA32_VMX_CR0_FIXED1) & 0xFFFFFFFF;
	
	/* Obtain VMX-fixed bits in CR4 */
	specs->cr4_fixed_0 = (uint32_t)rdmsr64(MSR_IA32_VMX_CR4_FIXED0) & 0xFFFFFFFF;
	specs->cr4_fixed_1 = (uint32_t)rdmsr64(MSR_IA32_VMX_CR4_FIXED1) & 0xFFFFFFFF;
}

/* -----------------------------------------------------------------------------
   vmx_on()
	Enter VMX root operation on this CPU.
   -------------------------------------------------------------------------- */
static void
vmx_on(void)
{
	vmx_cpu_t *cpu = &current_cpu_datap()->cpu_vmx;
	addr64_t vmxon_region_paddr;
	int result;

	vmx_init();
	
	assert(cpu->specs.vmx_present);

	if (NULL == cpu->vmxon_region)
		panic("vmx_on: VMXON region not allocated");
	vmxon_region_paddr = vmx_paddr(cpu->vmxon_region);

	/*
	 * Enable VMX operation.
	 */
	set_cr4(get_cr4() | CR4_VMXE);
	
	assert(vmx_is_cr0_valid(&cpu->specs));
	assert(vmx_is_cr4_valid(&cpu->specs));
	
	if ((result = __vmxon(&vmxon_region_paddr)) != VMX_SUCCEED) {
		panic("vmx_on: unexpected return %d from __vmxon()", result);
	}
}

/* -----------------------------------------------------------------------------
   vmx_off()
	Leave VMX root operation on this CPU.
   -------------------------------------------------------------------------- */
static void
vmx_off(void)
{
	int result;
	
	/* Tell the CPU to release the VMXON region */
	if ((result = __vmxoff()) != VMX_SUCCEED) {
		panic("vmx_off: unexpected return %d from __vmxoff()", result);
	}
}

/* -----------------------------------------------------------------------------
   vmx_allocate_vmxon_regions()
	Allocate, clear and init VMXON regions for all CPUs.
   -------------------------------------------------------------------------- */
static void
vmx_allocate_vmxon_regions(void)
{
	unsigned int i;
	
	for (i=0; i<real_ncpus; i++) {
		vmx_cpu_t *cpu = &cpu_datap(i)->cpu_vmx;

		/* The size is defined to be always <= 4K, so we just allocate a page */
		cpu->vmxon_region = vmx_pcalloc();
		if (NULL == cpu->vmxon_region)
			panic("vmx_allocate_vmxon_regions: unable to allocate VMXON region");
		*(uint32_t*)(cpu->vmxon_region) = cpu->specs.vmcs_id;
	}
}

/* -----------------------------------------------------------------------------
   vmx_free_vmxon_regions()
	Free VMXON regions for all CPUs.
   -------------------------------------------------------------------------- */
static void
vmx_free_vmxon_regions(void)
{
	unsigned int i;

	for (i=0; i<real_ncpus; i++) {
		vmx_cpu_t *cpu = &cpu_datap(i)->cpu_vmx;

		vmx_pfree(cpu->vmxon_region);
		cpu->vmxon_region = NULL;
	}
}

/* -----------------------------------------------------------------------------
   vmx_globally_available()
	Checks whether VT can be turned on for all CPUs.
   -------------------------------------------------------------------------- */
static boolean_t
vmx_globally_available(void)
{
	unsigned int i;
	
	boolean_t available = TRUE;

	for (i=0; i<real_ncpus; i++) {
		vmx_cpu_t *cpu = &cpu_datap(i)->cpu_vmx;

		if (!cpu->specs.vmx_present)
			available = FALSE;
	}
	VMX_KPRINTF("VMX available: %d\n", available);
	return available;
}


/* -----------------------------------------------------------------------------
   vmx_turn_on()
	Turn on VT operation on all CPUs.
   -------------------------------------------------------------------------- */
int
host_vmxon(boolean_t exclusive)
{
	int error;
	boolean_t do_it = FALSE; /* do the cpu sync outside of the area holding the lock */

	if (!vmx_globally_available())
		return VMX_UNSUPPORTED;

	simple_lock(&vmx_use_count_lock);

	if (vmx_exclusive) {
		error = VMX_INUSE;
	} else {
		vmx_use_count++;
		if (vmx_use_count == 1) /* was turned off before */
			do_it = TRUE;
		vmx_exclusive = exclusive;

		VMX_KPRINTF("VMX use count: %d\n", vmx_use_count);
		error = VMX_OK;
	}

	simple_unlock(&vmx_use_count_lock);

	if (do_it) {
		vmx_allocate_vmxon_regions();
		mp_rendezvous(NULL, (void (*)(void *))vmx_on, NULL, NULL);
	}
	return error;
}

/* -----------------------------------------------------------------------------
   vmx_turn_off()
	Turn off VT operation on all CPUs.
   -------------------------------------------------------------------------- */
void
host_vmxoff()
{
	boolean_t do_it = FALSE; /* do the cpu sync outside of the area holding the lock */

	simple_lock(&vmx_use_count_lock);

	if (vmx_use_count) {
		vmx_use_count--;
		vmx_exclusive = FALSE;
		if (!vmx_use_count)
			do_it = TRUE;
	}

	simple_unlock(&vmx_use_count_lock);

	if (do_it) {
		mp_rendezvous(NULL, (void (*)(void *))vmx_off, NULL, NULL);
		vmx_free_vmxon_regions();
	}

	VMX_KPRINTF("VMX use count: %d\n", vmx_use_count);
}

/* -----------------------------------------------------------------------------
   vmx_suspend()
	Turn off VT operation on this CPU if it was on.
	Called when a CPU goes offline.
   -------------------------------------------------------------------------- */
void
vmx_suspend()
{
	VMX_KPRINTF("vmx_suspend\n");
	if (vmx_use_count)
		vmx_off();
}

/* -----------------------------------------------------------------------------
   vmx_suspend()
	Restore the previous VT state. Called when CPU comes back online.
   -------------------------------------------------------------------------- */
void
vmx_resume()
{
	VMX_KPRINTF("vmx_resume\n");
	vmx_init(); /* init VMX on CPU #0 */
	if (vmx_use_count)
		vmx_on();
}
Commit	Line	Data
2d21ac55 A	1	/*
	2	* Copyright (c) 2006 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28
	29	#include <pexpert/pexpert.h>
	30	#include <i386/cpuid.h>
	31	#include <i386/cpu_data.h>
b0d623f7	32	#include <i386/mp.h>
2d21ac55 A	33	#include <i386/proc_reg.h>
	34	#include <i386/vmx.h>
	35	#include <i386/vmx/vmx_asm.h>
	36	#include <i386/vmx/vmx_shims.h>
	37	#include <i386/vmx/vmx_cpu.h>
	38	#include <i386/mtrr.h>
	39	#include <mach/mach_host.h> /* for host_info() */
2d21ac55 A	40
	41	#define VMX_KPRINTF(x...) /* kprintf("vmx: " x) */
	42
	43	int vmx_use_count = 0;
b0d623f7	44	boolean_t vmx_exclusive = FALSE;
2d21ac55 A	45	decl_simple_lock_data(static,vmx_use_count_lock)
	46
	47	/* -----------------------------------------------------------------------------
	48	vmx_is_available()
	49	Is the VMX facility available on this CPU?
	50	-------------------------------------------------------------------------- */
	51	static inline boolean_t
	52	vmx_is_available(void)
	53	{
	54	return (0 != (cpuid_features() & CPUID_FEATURE_VMX));
	55	}
	56
	57	/* -----------------------------------------------------------------------------
	58	vmxon_is_enabled()
	59	Is the VMXON instruction enabled on this CPU?
	60	-------------------------------------------------------------------------- */
	61	static inline boolean_t
	62	vmxon_is_enabled(void)
	63	{
	64	return (vmx_is_available() &&
	65	(rdmsr64(MSR_IA32_FEATURE_CONTROL) & MSR_IA32_FEATCTL_VMXON));
	66	}
	67
	68	/* -----------------------------------------------------------------------------
	69	vmx_is_cr0_valid()
	70	Is CR0 valid for executing VMXON on this CPU?
	71	-------------------------------------------------------------------------- */
	72	static inline boolean_t
	73	vmx_is_cr0_valid(vmx_specs_t *specs)
	74	{
b0d623f7	75	uintptr_t cr0 = get_cr0();
2d21ac55 A	76	return (0 == ((~cr0 & specs->cr0_fixed_0)\|(cr0 & ~specs->cr0_fixed_1)));
	77	}
	78
	79	/* -----------------------------------------------------------------------------
	80	vmx_is_cr4_valid()
	81	Is CR4 valid for executing VMXON on this CPU?
	82	-------------------------------------------------------------------------- */
	83	static inline boolean_t
	84	vmx_is_cr4_valid(vmx_specs_t *specs)
	85	{
b0d623f7	86	uintptr_t cr4 = get_cr4();
2d21ac55 A	87	return (0 == ((~cr4 & specs->cr4_fixed_0)\|(cr4 & ~specs->cr4_fixed_1)));
	88	}
	89
	90	static void
	91	vmx_init(void)
	92	{
	93	uint64_t msr_image;
	94
	95	if (!vmx_is_available())
	96	return;
	97
	98	/*
	99	* We don't count on EFI initializing MSR_IA32_FEATURE_CONTROL
	100	* and turning VMXON on and locking the bit, so we do that now.
	101	*/
	102	msr_image = rdmsr64(MSR_IA32_FEATURE_CONTROL);
	103	if (0 == ((msr_image & MSR_IA32_FEATCTL_LOCK)))
	104	wrmsr64(MSR_IA32_FEATURE_CONTROL,
	105	(msr_image \|
	106	MSR_IA32_FEATCTL_VMXON \|
	107	MSR_IA32_FEATCTL_LOCK));
	108	}
	109
	110	/* -----------------------------------------------------------------------------
	111	vmx_get_specs()
	112	Obtain VMX facility specifications for this CPU and
	113	enter them into the vmx_specs_t structure. If VMX is not available or
	114	disabled on this CPU, set vmx_present to false and return leaving
	115	the remainder of the vmx_specs_t uninitialized.
	116	-------------------------------------------------------------------------- */
	117	void
	118	vmx_get_specs()
	119	{
	120	vmx_specs_t *specs = &current_cpu_datap()->cpu_vmx.specs;
	121	uint64_t msr_image;
	122
	123	/* this is called once for every CPU, but the lock doesn't care :-) */
	124	simple_lock_init(&vmx_use_count_lock, 0);
	125
	126	vmx_init();
	127
	128	/*
	129	* if we have read the data on boot, we won't read it
	130	* again on wakeup, otherwise bad things will happen
	131	*/
	132	if (specs->initialized)
	133	return;
	134	else
	135	specs->initialized = TRUE;
	136
	137	/* See if VMX is present, return if it is not */
	138	specs->vmx_present = vmx_is_available() && vmxon_is_enabled();
	139	if (!specs->vmx_present)
	140	return;
	141
	142	#define bitfield(x,f) ((x >> f##_BIT) & f##_MASK)
	143	/* Obtain and decode VMX general capabilities */
	144	msr_image = rdmsr64(MSR_IA32_VMX_BASIC);
b0d623f7	145	specs->vmcs_id = (uint32_t)(msr_image & VMX_VCR_VMCS_REV_ID);
2d21ac55 A	146	specs->vmcs_mem_type = bitfield(msr_image, VMX_VCR_VMCS_MEM_TYPE) != 0;
	147	specs->vmcs_size = bitfield(msr_image, VMX_VCR_VMCS_SIZE);
	148
	149	/* Obtain allowed settings for pin-based execution controls */
	150	msr_image = rdmsr64(MSR_IA32_VMXPINBASED_CTLS);
b0d623f7 A	151	specs->pin_exctls_0 = (uint32_t)(msr_image & 0xFFFFFFFF);
b0d623f7 A	152	specs->pin_exctls_1 = (uint32_t)(msr_image >> 32);
2d21ac55 A	153
	154	/* Obtain allowed settings for processor-based execution controls */
	155	msr_image = rdmsr64(MSR_IA32_PROCBASED_CTLS);
b0d623f7 A	156	specs->proc_exctls_0 = (uint32_t)(msr_image & 0xFFFFFFFF);
b0d623f7 A	157	specs->proc_exctls_1 = (uint32_t)(msr_image >> 32);
2d21ac55 A	158
	159	/* Obtain allowed settings for VM-exit controls */
	160	msr_image = rdmsr64(MSR_IA32_VMX_EXIT_CTLS);
b0d623f7 A	161	specs->exit_ctls_0 = (uint32_t)(msr_image & 0xFFFFFFFF);
b0d623f7 A	162	specs->exit_ctls_1 = (uint32_t)(msr_image >> 32);
2d21ac55 A	163
	164	/* Obtain allowed settings for VM-entry controls */
	165	msr_image = rdmsr64(MSR_IA32_VMX_ENTRY_CTLS);
b0d623f7 A	166	specs->enter_ctls_0 = (uint32_t)(msr_image & 0xFFFFFFFF);
b0d623f7 A	167	specs->enter_ctls_0 = (uint32_t)(msr_image >> 32);
2d21ac55 A	168
	169	/* Obtain and decode miscellaneous capabilities */
	170	msr_image = rdmsr64(MSR_IA32_VMX_MISC);
	171	specs->act_halt = bitfield(msr_image, VMX_VCR_ACT_HLT) != 0;
	172	specs->act_shutdown = bitfield(msr_image, VMX_VCR_ACT_SHUTDOWN) != 0;
	173	specs->act_SIPI = bitfield(msr_image, VMX_VCR_ACT_SIPI) != 0;
	174	specs->act_CSTATE = bitfield(msr_image, VMX_VCR_ACT_CSTATE) != 0;
	175	specs->cr3_targs = bitfield(msr_image, VMX_VCR_CR3_TARGS);
b0d623f7 A	176	specs->max_msrs = (uint32_t)(512 * (1 + bitfield(msr_image, VMX_VCR_MAX_MSRS)));
b0d623f7 A	177	specs->mseg_id = (uint32_t)bitfield(msr_image, VMX_VCR_MSEG_ID);
2d21ac55 A	178
2d21ac55 A	179	/* Obtain VMX-fixed bits in CR0 */
b0d623f7 A	180	specs->cr0_fixed_0 = (uint32_t)rdmsr64(MSR_IA32_VMX_CR0_FIXED0) & 0xFFFFFFFF;
b0d623f7 A	181	specs->cr0_fixed_1 = (uint32_t)rdmsr64(MSR_IA32_VMX_CR0_FIXED1) & 0xFFFFFFFF;
2d21ac55 A	182
2d21ac55 A	183	/* Obtain VMX-fixed bits in CR4 */
b0d623f7 A	184	specs->cr4_fixed_0 = (uint32_t)rdmsr64(MSR_IA32_VMX_CR4_FIXED0) & 0xFFFFFFFF;
b0d623f7 A	185	specs->cr4_fixed_1 = (uint32_t)rdmsr64(MSR_IA32_VMX_CR4_FIXED1) & 0xFFFFFFFF;
2d21ac55 A	186	}
	187
	188	/* -----------------------------------------------------------------------------
	189	vmx_on()
	190	Enter VMX root operation on this CPU.
	191	-------------------------------------------------------------------------- */
	192	static void
	193	vmx_on(void)
	194	{
	195	vmx_cpu_t *cpu = &current_cpu_datap()->cpu_vmx;
	196	addr64_t vmxon_region_paddr;
	197	int result;
	198
	199	vmx_init();
	200
	201	assert(cpu->specs.vmx_present);
	202
	203	if (NULL == cpu->vmxon_region)
	204	panic("vmx_on: VMXON region not allocated");
	205	vmxon_region_paddr = vmx_paddr(cpu->vmxon_region);
	206
	207	/*
	208	* Enable VMX operation.
	209	*/
	210	set_cr4(get_cr4() \| CR4_VMXE);
	211
	212	assert(vmx_is_cr0_valid(&cpu->specs));
	213	assert(vmx_is_cr4_valid(&cpu->specs));
	214
	215	if ((result = __vmxon(&vmxon_region_paddr)) != VMX_SUCCEED) {
	216	panic("vmx_on: unexpected return %d from __vmxon()", result);
	217	}
	218	}
	219
	220	/* -----------------------------------------------------------------------------
	221	vmx_off()
	222	Leave VMX root operation on this CPU.
	223	-------------------------------------------------------------------------- */
	224	static void
	225	vmx_off(void)
	226	{
	227	int result;
	228
	229	/* Tell the CPU to release the VMXON region */
	230	if ((result = __vmxoff()) != VMX_SUCCEED) {
	231	panic("vmx_off: unexpected return %d from __vmxoff()", result);
	232	}
	233	}
	234
	235	/* -----------------------------------------------------------------------------
	236	vmx_allocate_vmxon_regions()
	237	Allocate, clear and init VMXON regions for all CPUs.
	238	-------------------------------------------------------------------------- */
	239	static void
	240	vmx_allocate_vmxon_regions(void)
	241	{
	242	unsigned int i;
	243
	244	for (i=0; i<real_ncpus; i++) {
	245	vmx_cpu_t *cpu = &cpu_datap(i)->cpu_vmx;
	246
	247	/* The size is defined to be always <= 4K, so we just allocate a page */
	248	cpu->vmxon_region = vmx_pcalloc();
	249	if (NULL == cpu->vmxon_region)
250	panic("vmx_allocate_vmxon_regions: unable to allocate VMXON region");
251	(uint32_t)(cpu->vmxon_region) = cpu->specs.vmcs_id;
252	}
253	}
254
255	/* -----------------------------------------------------------------------------
256	vmx_free_vmxon_regions()
257	Free VMXON regions for all CPUs.
258	-------------------------------------------------------------------------- */
259	static void
260	vmx_free_vmxon_regions(void)
261	{
262	unsigned int i;
263
264	for (i=0; i<real_ncpus; i++) {
265	vmx_cpu_t *cpu = &cpu_datap(i)->cpu_vmx;
266
267	vmx_pfree(cpu->vmxon_region);
268	cpu->vmxon_region = NULL;
269	}
270	}
271
272	/* -----------------------------------------------------------------------------
273	vmx_globally_available()
274	Checks whether VT can be turned on for all CPUs.
275	-------------------------------------------------------------------------- */
276	static boolean_t
277	vmx_globally_available(void)
278	{
279	unsigned int i;
280
281	boolean_t available = TRUE;
282
283	for (i=0; i<real_ncpus; i++) {
284	vmx_cpu_t *cpu = &cpu_datap(i)->cpu_vmx;
285
286	if (!cpu->specs.vmx_present)
287	available = FALSE;
288	}
289	VMX_KPRINTF("VMX available: %d\n", available);
290	return available;
291	}
292
293
294	/* -----------------------------------------------------------------------------
295	vmx_turn_on()
296	Turn on VT operation on all CPUs.
297	-------------------------------------------------------------------------- */
298	int
299	host_vmxon(boolean_t exclusive)
300	{
301	int error;
b0d623f7	302	boolean_t do_it = FALSE; /* do the cpu sync outside of the area holding the lock */
2d21ac55 A	303
	304	if (!vmx_globally_available())
	305	return VMX_UNSUPPORTED;
	306
	307	simple_lock(&vmx_use_count_lock);
	308
	309	if (vmx_exclusive) {
	310	error = VMX_INUSE;
b0d623f7 A	311	} else {
	312	vmx_use_count++;
	313	if (vmx_use_count == 1) /* was turned off before */
	314	do_it = TRUE;
	315	vmx_exclusive = exclusive;
	316
	317	VMX_KPRINTF("VMX use count: %d\n", vmx_use_count);
	318	error = VMX_OK;
2d21ac55	319	}
2d21ac55	320
2d21ac55 A	321	simple_unlock(&vmx_use_count_lock);
2d21ac55 A	322
b0d623f7 A	323	if (do_it) {
	324	vmx_allocate_vmxon_regions();
	325	mp_rendezvous(NULL, (void ()(void ))vmx_on, NULL, NULL);
	326	}
2d21ac55 A	327	return error;
	328	}
	329
	330	/* -----------------------------------------------------------------------------
	331	vmx_turn_off()
	332	Turn off VT operation on all CPUs.
	333	-------------------------------------------------------------------------- */
	334	void
	335	host_vmxoff()
	336	{
b0d623f7 A	337	boolean_t do_it = FALSE; /* do the cpu sync outside of the area holding the lock */
b0d623f7 A	338
2d21ac55 A	339	simple_lock(&vmx_use_count_lock);
	340
	341	if (vmx_use_count) {
	342	vmx_use_count--;
b0d623f7 A	343	vmx_exclusive = FALSE;
	344	if (!vmx_use_count)
	345	do_it = TRUE;
2d21ac55 A	346	}
	347
	348	simple_unlock(&vmx_use_count_lock);
	349
b0d623f7 A	350	if (do_it) {
	351	mp_rendezvous(NULL, (void ()(void ))vmx_off, NULL, NULL);
	352	vmx_free_vmxon_regions();
	353	}
	354
2d21ac55 A	355	VMX_KPRINTF("VMX use count: %d\n", vmx_use_count);
	356	}
	357
	358	/* -----------------------------------------------------------------------------
	359	vmx_suspend()
	360	Turn off VT operation on this CPU if it was on.
	361	Called when a CPU goes offline.
	362	-------------------------------------------------------------------------- */
	363	void
	364	vmx_suspend()
	365	{
	366	VMX_KPRINTF("vmx_suspend\n");
	367	if (vmx_use_count)
	368	vmx_off();
	369	}
	370
	371	/* -----------------------------------------------------------------------------
	372	vmx_suspend()
	373	Restore the previous VT state. Called when CPU comes back online.
	374	-------------------------------------------------------------------------- */
	375	void
	376	vmx_resume()
	377	{
	378	VMX_KPRINTF("vmx_resume\n");
c910b4d9	379	vmx_init(); /* init VMX on CPU #0 */
2d21ac55 A	380	if (vmx_use_count)
	381	vmx_on();
	382	}