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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2018 Joyent, Inc.
*/
#include <sys/cmn_err.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/mutex.h>
#include <sys/debug.h>
static kmutex_t hvm_excl_lock;
static const char *hvm_excl_holder = NULL;
/*
* HVM Exclusion Interface
*
* To avoid VMX/SVM conflicts from arising when multiple hypervisor providers
* (eg. KVM, bhyve) are shipped with the system, this simple advisory locking
* system is presented for their use. Until a proper hypervisor API, like the
* one in OSX, is shipped in illumos, this will serve as opt-in regulation to
* dictate that only a single hypervisor be allowed to configure the system and
* run at any given time.
*/
boolean_t
hvm_excl_hold(const char *consumer)
{
boolean_t res;
mutex_enter(&hvm_excl_lock);
if (hvm_excl_holder == NULL) {
hvm_excl_holder = consumer;
res = B_TRUE;
} else {
cmn_err(CE_WARN, "zone '%s' cannot take HVM exclusion lock as "
"'%s': held by '%s'", curproc->p_zone->zone_name, consumer,
hvm_excl_holder);
res = B_FALSE;
}
mutex_exit(&hvm_excl_lock);
return (res);
}
void
hvm_excl_rele(const char *consumer)
{
mutex_enter(&hvm_excl_lock);
VERIFY(consumer == hvm_excl_holder);
hvm_excl_holder = NULL;
mutex_exit(&hvm_excl_lock);
}
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