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This supersedes the sysctl interface, which has the limitations of being root-only and not supporting automatic resource destruction, i.e., we cannot easily destroy VMs automatically when bhyve terminates. For now, two ioctls are implemented VMMCTL_VM_CREATE and VMMCTL_VM_DESTROY. Eventually I would like to support tying a VM's lifetime to that of the descriptor, so that it is automatically destroyed when the descriptor is closed. However, this will require some work in bhyve: when the guest wants to reboot, bhyve exits with a status that indicates that it is to be restarted. This is incompatible with the idea of tying a VM's lifetime to that of a descriptor, since we want to avoid creating and destroying a VM across each reboot (as this involves freeing all of the guest memory, among other things). One possible design would be to decompose bhyve into two processes, a parent which handles reboots, and a child which runs in capability mode and handles guest execution. In any case, this gets us closer to addressing the shortcomings mentioned above. Reviewed by: jhb Differential Revision: https://reviews.freebsd.org/D47028
70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2011 NetApp, Inc.
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* Copyright (C) 2015 Mihai Carabas <mihai.carabas@gmail.com>
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* All rights reserved.
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*/
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#ifndef _DEV_VMM_DEV_H_
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#define _DEV_VMM_DEV_H_
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#include <sys/types.h>
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#include <sys/ioccom.h>
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#include <machine/vmm_dev.h>
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#ifdef _KERNEL
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struct thread;
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struct vm;
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struct vcpu;
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int vmmdev_init(void);
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int vmmdev_cleanup(void);
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int vmmdev_machdep_ioctl(struct vm *vm, struct vcpu *vcpu, u_long cmd,
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caddr_t data, int fflag, struct thread *td);
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/*
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* Entry in an ioctl handler table. A number of generic ioctls are defined,
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* plus a table of machine-dependent ioctls. The flags indicate the
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* required preconditions for a given ioctl.
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*
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* Some ioctls encode a vcpuid as the first member of their ioctl structure.
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* These ioctls must specify one of the following flags:
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* - ALLOC_VCPU: create the vCPU if it does not already exist
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* - LOCK_ONE_VCPU: create the vCPU if it does not already exist
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* and lock the vCPU for the duration of the ioctl
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* - MAYBE_ALLOC_VCPU: if the vcpuid is -1, do nothing, otherwise
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* create the vCPU if it does not already exist
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*/
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struct vmmdev_ioctl {
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unsigned long cmd;
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#define VMMDEV_IOCTL_SLOCK_MEMSEGS 0x01
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#define VMMDEV_IOCTL_XLOCK_MEMSEGS 0x02
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#define VMMDEV_IOCTL_LOCK_ONE_VCPU 0x04
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#define VMMDEV_IOCTL_LOCK_ALL_VCPUS 0x08
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#define VMMDEV_IOCTL_ALLOC_VCPU 0x10
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#define VMMDEV_IOCTL_MAYBE_ALLOC_VCPU 0x20
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int flags;
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};
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#define VMMDEV_IOCTL(_cmd, _flags) { .cmd = (_cmd), .flags = (_flags) }
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extern const struct vmmdev_ioctl vmmdev_machdep_ioctls[];
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extern const size_t vmmdev_machdep_ioctl_count;
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#endif /* _KERNEL */
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struct vmmctl_vm_create {
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char name[VM_MAX_NAMELEN + 1];
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int reserved[16];
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};
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struct vmmctl_vm_destroy {
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char name[VM_MAX_NAMELEN + 1];
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int reserved[16];
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};
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#define VMMCTL_VM_CREATE _IOWR('V', 0, struct vmmctl_vm_create)
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#define VMMCTL_VM_DESTROY _IOWR('V', 1, struct vmmctl_vm_destroy)
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#endif /* _DEV_VMM_DEV_H_ */
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