75dd336603
This also gets rid of all the witness.watch warnings related to calling malloc(M_WAITOK) while holding a mutex. Reviewed by: grehan
539 lines
13 KiB
C
539 lines
13 KiB
C
/*-
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* Copyright (c) 2011 NetApp, 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, this list of conditions and the following 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 NETAPP, INC ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/queue.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/malloc.h>
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#include <sys/conf.h>
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#include <sys/sysctl.h>
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#include <sys/libkern.h>
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#include <sys/ioccom.h>
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#include <sys/mman.h>
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#include <sys/uio.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <machine/pmap.h>
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#include <machine/vmparam.h>
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#include <machine/vmm.h>
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#include "vmm_lapic.h"
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#include "vmm_stat.h"
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#include "vmm_mem.h"
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#include "io/ppt.h"
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#include <machine/vmm_dev.h>
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struct vmmdev_softc {
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struct vm *vm; /* vm instance cookie */
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struct cdev *cdev;
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SLIST_ENTRY(vmmdev_softc) link;
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};
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static SLIST_HEAD(, vmmdev_softc) head;
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static struct mtx vmmdev_mtx;
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static MALLOC_DEFINE(M_VMMDEV, "vmmdev", "vmmdev");
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SYSCTL_DECL(_hw_vmm);
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static struct vmmdev_softc *
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vmmdev_lookup(const char *name)
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{
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struct vmmdev_softc *sc;
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#ifdef notyet /* XXX kernel is not compiled with invariants */
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mtx_assert(&vmmdev_mtx, MA_OWNED);
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#endif
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SLIST_FOREACH(sc, &head, link) {
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if (strcmp(name, vm_name(sc->vm)) == 0)
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break;
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}
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return (sc);
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}
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static struct vmmdev_softc *
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vmmdev_lookup2(struct cdev *cdev)
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{
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return (cdev->si_drv1);
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}
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static int
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vmmdev_rw(struct cdev *cdev, struct uio *uio, int flags)
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{
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int error, off, c;
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vm_paddr_t hpa, gpa;
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struct vmmdev_softc *sc;
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static char zerobuf[PAGE_SIZE];
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error = 0;
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mtx_lock(&vmmdev_mtx);
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sc = vmmdev_lookup2(cdev);
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if (sc == NULL)
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error = ENXIO;
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while (uio->uio_resid > 0 && error == 0) {
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gpa = uio->uio_offset;
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off = gpa & PAGE_MASK;
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c = min(uio->uio_resid, PAGE_SIZE - off);
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/*
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* The VM has a hole in its physical memory map. If we want to
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* use 'dd' to inspect memory beyond the hole we need to
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* provide bogus data for memory that lies in the hole.
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*
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* Since this device does not support lseek(2), dd(1) will
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* read(2) blocks of data to simulate the lseek(2).
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*/
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hpa = vm_gpa2hpa(sc->vm, gpa, c);
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if (hpa == (vm_paddr_t)-1) {
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if (uio->uio_rw == UIO_READ)
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error = uiomove(zerobuf, c, uio);
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else
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error = EFAULT;
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} else
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error = uiomove((void *)PHYS_TO_DMAP(hpa), c, uio);
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}
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mtx_unlock(&vmmdev_mtx);
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return (error);
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}
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static int
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vmmdev_ioctl(struct cdev *cdev, u_long cmd, caddr_t data, int fflag,
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struct thread *td)
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{
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int error, vcpu, state_changed;
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enum vcpu_state new_state;
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struct vmmdev_softc *sc;
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struct vm_memory_segment *seg;
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struct vm_register *vmreg;
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struct vm_seg_desc* vmsegdesc;
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struct vm_pin *vmpin;
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struct vm_run *vmrun;
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struct vm_event *vmevent;
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struct vm_lapic_irq *vmirq;
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struct vm_capability *vmcap;
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struct vm_pptdev *pptdev;
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struct vm_pptdev_mmio *pptmmio;
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struct vm_pptdev_msi *pptmsi;
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struct vm_pptdev_msix *pptmsix;
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struct vm_nmi *vmnmi;
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struct vm_stats *vmstats;
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struct vm_stat_desc *statdesc;
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struct vm_x2apic *x2apic;
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sc = vmmdev_lookup2(cdev);
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if (sc == NULL)
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return (ENXIO);
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vcpu = -1;
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state_changed = 0;
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/*
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* Some VMM ioctls can operate only on vcpus that are not running.
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*/
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switch (cmd) {
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case VM_RUN:
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case VM_SET_PINNING:
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case VM_GET_REGISTER:
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case VM_SET_REGISTER:
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case VM_GET_SEGMENT_DESCRIPTOR:
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case VM_SET_SEGMENT_DESCRIPTOR:
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case VM_INJECT_EVENT:
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case VM_GET_CAPABILITY:
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case VM_SET_CAPABILITY:
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case VM_PPTDEV_MSI:
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case VM_PPTDEV_MSIX:
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case VM_SET_X2APIC_STATE:
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/*
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* XXX fragile, handle with care
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* Assumes that the first field of the ioctl data is the vcpu.
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*/
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vcpu = *(int *)data;
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if (vcpu < 0 || vcpu >= VM_MAXCPU) {
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error = EINVAL;
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goto done;
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}
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if (cmd == VM_RUN)
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new_state = VCPU_RUNNING;
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else
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new_state = VCPU_CANNOT_RUN;
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error = vcpu_set_state(sc->vm, vcpu, new_state);
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if (error)
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goto done;
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state_changed = 1;
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break;
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case VM_MAP_PPTDEV_MMIO:
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case VM_BIND_PPTDEV:
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case VM_UNBIND_PPTDEV:
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case VM_MAP_MEMORY:
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/*
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* ioctls that operate on the entire virtual machine must
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* prevent all vcpus from running.
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*/
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error = 0;
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for (vcpu = 0; vcpu < VM_MAXCPU; vcpu++) {
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error = vcpu_set_state(sc->vm, vcpu, VCPU_CANNOT_RUN);
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if (error)
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break;
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}
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if (error) {
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while (--vcpu >= 0)
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vcpu_set_state(sc->vm, vcpu, VCPU_IDLE);
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goto done;
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}
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state_changed = 2;
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break;
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default:
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break;
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}
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switch(cmd) {
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case VM_RUN:
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vmrun = (struct vm_run *)data;
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error = vm_run(sc->vm, vmrun);
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break;
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case VM_STAT_DESC: {
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const char *desc;
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statdesc = (struct vm_stat_desc *)data;
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desc = vmm_stat_desc(statdesc->index);
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if (desc != NULL) {
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error = 0;
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strlcpy(statdesc->desc, desc, sizeof(statdesc->desc));
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} else
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error = EINVAL;
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break;
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}
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case VM_STATS: {
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CTASSERT(MAX_VM_STATS >= MAX_VMM_STAT_TYPES);
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vmstats = (struct vm_stats *)data;
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getmicrotime(&vmstats->tv);
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error = vmm_stat_copy(sc->vm, vmstats->cpuid,
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&vmstats->num_entries, vmstats->statbuf);
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break;
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}
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case VM_PPTDEV_MSI:
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pptmsi = (struct vm_pptdev_msi *)data;
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error = ppt_setup_msi(sc->vm, pptmsi->vcpu,
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pptmsi->bus, pptmsi->slot, pptmsi->func,
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pptmsi->destcpu, pptmsi->vector,
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pptmsi->numvec);
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break;
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case VM_PPTDEV_MSIX:
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pptmsix = (struct vm_pptdev_msix *)data;
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error = ppt_setup_msix(sc->vm, pptmsix->vcpu,
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pptmsix->bus, pptmsix->slot,
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pptmsix->func, pptmsix->idx,
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pptmsix->msg, pptmsix->vector_control,
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pptmsix->addr);
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break;
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case VM_MAP_PPTDEV_MMIO:
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pptmmio = (struct vm_pptdev_mmio *)data;
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error = ppt_map_mmio(sc->vm, pptmmio->bus, pptmmio->slot,
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pptmmio->func, pptmmio->gpa, pptmmio->len,
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pptmmio->hpa);
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break;
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case VM_BIND_PPTDEV:
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pptdev = (struct vm_pptdev *)data;
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error = ppt_assign_device(sc->vm, pptdev->bus, pptdev->slot,
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pptdev->func);
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break;
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case VM_UNBIND_PPTDEV:
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pptdev = (struct vm_pptdev *)data;
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error = ppt_unassign_device(sc->vm, pptdev->bus, pptdev->slot,
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pptdev->func);
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break;
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case VM_INJECT_EVENT:
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vmevent = (struct vm_event *)data;
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error = vm_inject_event(sc->vm, vmevent->cpuid, vmevent->type,
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vmevent->vector,
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vmevent->error_code,
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vmevent->error_code_valid);
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break;
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case VM_INJECT_NMI:
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vmnmi = (struct vm_nmi *)data;
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error = vm_inject_nmi(sc->vm, vmnmi->cpuid);
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break;
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case VM_LAPIC_IRQ:
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vmirq = (struct vm_lapic_irq *)data;
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error = lapic_set_intr(sc->vm, vmirq->cpuid, vmirq->vector);
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break;
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case VM_SET_PINNING:
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vmpin = (struct vm_pin *)data;
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error = vm_set_pinning(sc->vm, vmpin->vm_cpuid,
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vmpin->host_cpuid);
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break;
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case VM_GET_PINNING:
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vmpin = (struct vm_pin *)data;
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error = vm_get_pinning(sc->vm, vmpin->vm_cpuid,
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&vmpin->host_cpuid);
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break;
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case VM_MAP_MEMORY:
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seg = (struct vm_memory_segment *)data;
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error = vm_malloc(sc->vm, seg->gpa, seg->len);
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break;
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case VM_GET_MEMORY_SEG:
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seg = (struct vm_memory_segment *)data;
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seg->len = 0;
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(void)vm_gpabase2memseg(sc->vm, seg->gpa, seg);
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error = 0;
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break;
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case VM_GET_REGISTER:
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vmreg = (struct vm_register *)data;
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error = vm_get_register(sc->vm, vmreg->cpuid, vmreg->regnum,
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&vmreg->regval);
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break;
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case VM_SET_REGISTER:
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vmreg = (struct vm_register *)data;
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error = vm_set_register(sc->vm, vmreg->cpuid, vmreg->regnum,
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vmreg->regval);
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break;
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case VM_SET_SEGMENT_DESCRIPTOR:
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vmsegdesc = (struct vm_seg_desc *)data;
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error = vm_set_seg_desc(sc->vm, vmsegdesc->cpuid,
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vmsegdesc->regnum,
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&vmsegdesc->desc);
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break;
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case VM_GET_SEGMENT_DESCRIPTOR:
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vmsegdesc = (struct vm_seg_desc *)data;
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error = vm_get_seg_desc(sc->vm, vmsegdesc->cpuid,
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vmsegdesc->regnum,
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&vmsegdesc->desc);
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break;
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case VM_GET_CAPABILITY:
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vmcap = (struct vm_capability *)data;
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error = vm_get_capability(sc->vm, vmcap->cpuid,
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vmcap->captype,
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&vmcap->capval);
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break;
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case VM_SET_CAPABILITY:
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vmcap = (struct vm_capability *)data;
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error = vm_set_capability(sc->vm, vmcap->cpuid,
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vmcap->captype,
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vmcap->capval);
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break;
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case VM_SET_X2APIC_STATE:
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x2apic = (struct vm_x2apic *)data;
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error = vm_set_x2apic_state(sc->vm,
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x2apic->cpuid, x2apic->state);
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break;
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case VM_GET_X2APIC_STATE:
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x2apic = (struct vm_x2apic *)data;
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error = vm_get_x2apic_state(sc->vm,
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x2apic->cpuid, &x2apic->state);
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break;
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default:
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error = ENOTTY;
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break;
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}
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if (state_changed == 1) {
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vcpu_set_state(sc->vm, vcpu, VCPU_IDLE);
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} else if (state_changed == 2) {
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for (vcpu = 0; vcpu < VM_MAXCPU; vcpu++)
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vcpu_set_state(sc->vm, vcpu, VCPU_IDLE);
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}
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done:
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return (error);
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}
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static int
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vmmdev_mmap(struct cdev *cdev, vm_ooffset_t offset, vm_paddr_t *paddr,
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int nprot, vm_memattr_t *memattr)
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{
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int error;
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struct vmmdev_softc *sc;
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error = -1;
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mtx_lock(&vmmdev_mtx);
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sc = vmmdev_lookup2(cdev);
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if (sc != NULL && (nprot & PROT_EXEC) == 0) {
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*paddr = vm_gpa2hpa(sc->vm, (vm_paddr_t)offset, PAGE_SIZE);
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if (*paddr != (vm_paddr_t)-1)
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error = 0;
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}
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mtx_unlock(&vmmdev_mtx);
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return (error);
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}
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static void
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vmmdev_destroy(struct vmmdev_softc *sc, boolean_t unlink)
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{
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/*
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* XXX must stop virtual machine instances that may be still
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* running and cleanup their state.
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*/
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if (sc->cdev)
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destroy_dev(sc->cdev);
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if (sc->vm)
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vm_destroy(sc->vm);
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if (unlink) {
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mtx_lock(&vmmdev_mtx);
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SLIST_REMOVE(&head, sc, vmmdev_softc, link);
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mtx_unlock(&vmmdev_mtx);
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}
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free(sc, M_VMMDEV);
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}
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static int
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sysctl_vmm_destroy(SYSCTL_HANDLER_ARGS)
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{
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int error;
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char buf[VM_MAX_NAMELEN];
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struct vmmdev_softc *sc;
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strlcpy(buf, "beavis", sizeof(buf));
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error = sysctl_handle_string(oidp, buf, sizeof(buf), req);
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if (error != 0 || req->newptr == NULL)
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return (error);
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/*
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* XXX TODO if any process has this device open then fail
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*/
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mtx_lock(&vmmdev_mtx);
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sc = vmmdev_lookup(buf);
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if (sc == NULL) {
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mtx_unlock(&vmmdev_mtx);
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return (EINVAL);
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}
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sc->cdev->si_drv1 = NULL;
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mtx_unlock(&vmmdev_mtx);
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vmmdev_destroy(sc, TRUE);
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return (0);
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}
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SYSCTL_PROC(_hw_vmm, OID_AUTO, destroy, CTLTYPE_STRING | CTLFLAG_RW,
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NULL, 0, sysctl_vmm_destroy, "A", NULL);
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static struct cdevsw vmmdevsw = {
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.d_name = "vmmdev",
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.d_version = D_VERSION,
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.d_ioctl = vmmdev_ioctl,
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.d_mmap = vmmdev_mmap,
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.d_read = vmmdev_rw,
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.d_write = vmmdev_rw,
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};
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static int
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sysctl_vmm_create(SYSCTL_HANDLER_ARGS)
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{
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int error;
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struct vm *vm;
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struct vmmdev_softc *sc, *sc2;
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char buf[VM_MAX_NAMELEN];
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strlcpy(buf, "beavis", sizeof(buf));
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error = sysctl_handle_string(oidp, buf, sizeof(buf), req);
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if (error != 0 || req->newptr == NULL)
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return (error);
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mtx_lock(&vmmdev_mtx);
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sc = vmmdev_lookup(buf);
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mtx_unlock(&vmmdev_mtx);
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if (sc != NULL)
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return (EEXIST);
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vm = vm_create(buf);
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if (vm == NULL)
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return (EINVAL);
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sc = malloc(sizeof(struct vmmdev_softc), M_VMMDEV, M_WAITOK | M_ZERO);
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sc->vm = vm;
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/*
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* Lookup the name again just in case somebody sneaked in when we
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* dropped the lock.
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*/
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mtx_lock(&vmmdev_mtx);
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sc2 = vmmdev_lookup(buf);
|
|
if (sc2 == NULL)
|
|
SLIST_INSERT_HEAD(&head, sc, link);
|
|
mtx_unlock(&vmmdev_mtx);
|
|
|
|
if (sc2 != NULL) {
|
|
vmmdev_destroy(sc, FALSE);
|
|
return (EEXIST);
|
|
}
|
|
|
|
sc->cdev = make_dev(&vmmdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
|
|
"vmm/%s", buf);
|
|
sc->cdev->si_drv1 = sc;
|
|
|
|
return (0);
|
|
}
|
|
SYSCTL_PROC(_hw_vmm, OID_AUTO, create, CTLTYPE_STRING | CTLFLAG_RW,
|
|
NULL, 0, sysctl_vmm_create, "A", NULL);
|
|
|
|
void
|
|
vmmdev_init(void)
|
|
{
|
|
mtx_init(&vmmdev_mtx, "vmm device mutex", NULL, MTX_DEF);
|
|
}
|
|
|
|
int
|
|
vmmdev_cleanup(void)
|
|
{
|
|
int error;
|
|
|
|
if (SLIST_EMPTY(&head))
|
|
error = 0;
|
|
else
|
|
error = EBUSY;
|
|
|
|
return (error);
|
|
}
|