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freebsd-nq/sys/amd64/vmm/vmm_dev.c
John Baldwin 1925586e03 Honor the disabled setting for MSI-X interrupts for passthrough devices. 
Add a new ioctl to disable all MSI-X interrupts for a PCI passthrough
device and invoke it if a write to the MSI-X capability registers
disables MSI-X.  This avoids leaving MSI-X interrupts enabled on the
host if a guest device driver has disabled them (e.g. as part of
detaching a guest device driver).

This was found by Chelsio QA when testing that a Linux guest could
switch from MSI-X to MSI interrupts when using the cxgb4vf driver.

While here, explicitly fail requests to enable MSI on a passthrough
device if MSI-X is enabled and vice versa.

Reported by:	Sony Arpita Das @ Chelsio
Reviewed by:	grehan, markj
MFC after:	2 weeks
Sponsored by:	Chelsio Communications
Differential Revision:	https://reviews.freebsd.org/D27212
2020-11-24 23:18:52 +00:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2011 NetApp, 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, 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 NETAPP, INC ``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 NETAPP, INC OR CONTRIBUTORS 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.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_bhyve_snapshot.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/jail.h>
#include <sys/queue.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/malloc.h>
#include <sys/conf.h>
#include <sys/sysctl.h>
#include <sys/libkern.h>
#include <sys/ioccom.h>
#include <sys/mman.h>
#include <sys/uio.h>
#include <sys/proc.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_object.h>
#include <machine/vmparam.h>
#include <machine/vmm.h>
#include <machine/vmm_dev.h>
#include <machine/vmm_instruction_emul.h>
#include <machine/vmm_snapshot.h>
#include <x86/apicreg.h>
#include "vmm_lapic.h"
#include "vmm_stat.h"
#include "vmm_mem.h"
#include "io/ppt.h"
#include "io/vatpic.h"
#include "io/vioapic.h"
#include "io/vhpet.h"
#include "io/vrtc.h"
struct devmem_softc {
int segid;
char *name;
struct cdev *cdev;
struct vmmdev_softc *sc;
SLIST_ENTRY(devmem_softc) link;
};
struct vmmdev_softc {
struct vm *vm; /* vm instance cookie */
struct cdev *cdev;
SLIST_ENTRY(vmmdev_softc) link;
SLIST_HEAD(, devmem_softc) devmem;
int flags;
};
#define VSC_LINKED 0x01
static SLIST_HEAD(, vmmdev_softc) head;
static unsigned pr_allow_flag;
static struct mtx vmmdev_mtx;
static MALLOC_DEFINE(M_VMMDEV, "vmmdev", "vmmdev");
SYSCTL_DECL(_hw_vmm);
static int vmm_priv_check(struct ucred *ucred);
static int devmem_create_cdev(const char *vmname, int id, char *devmem);
static void devmem_destroy(void *arg);
static int
vmm_priv_check(struct ucred *ucred)
{
if (jailed(ucred) &&
!(ucred->cr_prison->pr_allow & pr_allow_flag))
return (EPERM);
return (0);
}
static int
vcpu_lock_one(struct vmmdev_softc *sc, int vcpu)
{
int error;
if (vcpu < 0 || vcpu >= vm_get_maxcpus(sc->vm))
return (EINVAL);
error = vcpu_set_state(sc->vm, vcpu, VCPU_FROZEN, true);
return (error);
}
static void
vcpu_unlock_one(struct vmmdev_softc *sc, int vcpu)
{
enum vcpu_state state;
state = vcpu_get_state(sc->vm, vcpu, NULL);
if (state != VCPU_FROZEN) {
panic("vcpu %s(%d) has invalid state %d", vm_name(sc->vm),
vcpu, state);
}
vcpu_set_state(sc->vm, vcpu, VCPU_IDLE, false);
}
static int
vcpu_lock_all(struct vmmdev_softc *sc)
{
int error, vcpu;
uint16_t maxcpus;
maxcpus = vm_get_maxcpus(sc->vm);
for (vcpu = 0; vcpu < maxcpus; vcpu++) {
error = vcpu_lock_one(sc, vcpu);
if (error)
break;
}
if (error) {
while (--vcpu >= 0)
vcpu_unlock_one(sc, vcpu);
}
return (error);
}
static void
vcpu_unlock_all(struct vmmdev_softc *sc)
{
int vcpu;
uint16_t maxcpus;
maxcpus = vm_get_maxcpus(sc->vm);
for (vcpu = 0; vcpu < maxcpus; vcpu++)
vcpu_unlock_one(sc, vcpu);
}
static struct vmmdev_softc *
vmmdev_lookup(const char *name)
{
struct vmmdev_softc *sc;
#ifdef notyet /* XXX kernel is not compiled with invariants */
mtx_assert(&vmmdev_mtx, MA_OWNED);
#endif
SLIST_FOREACH(sc, &head, link) {
if (strcmp(name, vm_name(sc->vm)) == 0)
break;
}
return (sc);
}
static struct vmmdev_softc *
vmmdev_lookup2(struct cdev *cdev)
{
return (cdev->si_drv1);
}
static int
vmmdev_rw(struct cdev *cdev, struct uio *uio, int flags)
{
int error, off, c, prot;
vm_paddr_t gpa, maxaddr;
void *hpa, *cookie;
struct vmmdev_softc *sc;
uint16_t lastcpu;
error = vmm_priv_check(curthread->td_ucred);
if (error)
return (error);
sc = vmmdev_lookup2(cdev);
if (sc == NULL)
return (ENXIO);
/*
* Get a read lock on the guest memory map by freezing any vcpu.
*/
lastcpu = vm_get_maxcpus(sc->vm) - 1;
error = vcpu_lock_one(sc, lastcpu);
if (error)
return (error);
prot = (uio->uio_rw == UIO_WRITE ? VM_PROT_WRITE : VM_PROT_READ);
maxaddr = vmm_sysmem_maxaddr(sc->vm);
while (uio->uio_resid > 0 && error == 0) {
gpa = uio->uio_offset;
off = gpa & PAGE_MASK;
c = min(uio->uio_resid, PAGE_SIZE - off);
/*
* The VM has a hole in its physical memory map. If we want to
* use 'dd' to inspect memory beyond the hole we need to
* provide bogus data for memory that lies in the hole.
*
* Since this device does not support lseek(2), dd(1) will
* read(2) blocks of data to simulate the lseek(2).
*/
hpa = vm_gpa_hold(sc->vm, lastcpu, gpa, c,
prot, &cookie);
if (hpa == NULL) {
if (uio->uio_rw == UIO_READ && gpa < maxaddr)
error = uiomove(__DECONST(void *, zero_region),
c, uio);
else
error = EFAULT;
} else {
error = uiomove(hpa, c, uio);
vm_gpa_release(cookie);
}
}
vcpu_unlock_one(sc, lastcpu);
return (error);
}
CTASSERT(sizeof(((struct vm_memseg *)0)->name) >= VM_MAX_SUFFIXLEN + 1);
static int
get_memseg(struct vmmdev_softc *sc, struct vm_memseg *mseg, size_t len)
{
struct devmem_softc *dsc;
int error;
bool sysmem;
error = vm_get_memseg(sc->vm, mseg->segid, &mseg->len, &sysmem, NULL);
if (error || mseg->len == 0)
return (error);
if (!sysmem) {
SLIST_FOREACH(dsc, &sc->devmem, link) {
if (dsc->segid == mseg->segid)
break;
}
KASSERT(dsc != NULL, ("%s: devmem segment %d not found",
__func__, mseg->segid));
error = copystr(dsc->name, mseg->name, len, NULL);
} else {
bzero(mseg->name, len);
}
return (error);
}
static int
alloc_memseg(struct vmmdev_softc *sc, struct vm_memseg *mseg, size_t len)
{
char *name;
int error;
bool sysmem;
error = 0;
name = NULL;
sysmem = true;
/*
* The allocation is lengthened by 1 to hold a terminating NUL. It'll
* by stripped off when devfs processes the full string.
*/
if (VM_MEMSEG_NAME(mseg)) {
sysmem = false;
name = malloc(len, M_VMMDEV, M_WAITOK);
error = copystr(mseg->name, name, len, NULL);
if (error)
goto done;
}
error = vm_alloc_memseg(sc->vm, mseg->segid, mseg->len, sysmem);
if (error)
goto done;
if (VM_MEMSEG_NAME(mseg)) {
error = devmem_create_cdev(vm_name(sc->vm), mseg->segid, name);
if (error)
vm_free_memseg(sc->vm, mseg->segid);
else
name = NULL; /* freed when 'cdev' is destroyed */
}
done:
free(name, M_VMMDEV);
return (error);
}
static int
vm_get_register_set(struct vm *vm, int vcpu, unsigned int count, int *regnum,
uint64_t *regval)
{
int error, i;
error = 0;
for (i = 0; i < count; i++) {
error = vm_get_register(vm, vcpu, regnum[i], &regval[i]);
if (error)
break;
}
return (error);
}
static int
vm_set_register_set(struct vm *vm, int vcpu, unsigned int count, int *regnum,
uint64_t *regval)
{
int error, i;
error = 0;
for (i = 0; i < count; i++) {
error = vm_set_register(vm, vcpu, regnum[i], regval[i]);
if (error)
break;
}
return (error);
}
static int
vmmdev_ioctl(struct cdev *cdev, u_long cmd, caddr_t data, int fflag,
struct thread *td)
{
int error, vcpu, state_changed, size;
cpuset_t *cpuset;
struct vmmdev_softc *sc;
struct vm_register *vmreg;
struct vm_seg_desc *vmsegdesc;
struct vm_register_set *vmregset;
struct vm_run *vmrun;
struct vm_exception *vmexc;
struct vm_lapic_irq *vmirq;
struct vm_lapic_msi *vmmsi;
struct vm_ioapic_irq *ioapic_irq;
struct vm_isa_irq *isa_irq;
struct vm_isa_irq_trigger *isa_irq_trigger;
struct vm_capability *vmcap;
struct vm_pptdev *pptdev;
struct vm_pptdev_mmio *pptmmio;
struct vm_pptdev_msi *pptmsi;
struct vm_pptdev_msix *pptmsix;
struct vm_nmi *vmnmi;
struct vm_stats *vmstats;
struct vm_stat_desc *statdesc;
struct vm_x2apic *x2apic;
struct vm_gpa_pte *gpapte;
struct vm_suspend *vmsuspend;
struct vm_gla2gpa *gg;
struct vm_activate_cpu *vac;
struct vm_cpuset *vm_cpuset;
struct vm_intinfo *vmii;
struct vm_rtc_time *rtctime;
struct vm_rtc_data *rtcdata;
struct vm_memmap *mm;
struct vm_cpu_topology *topology;
struct vm_readwrite_kernemu_device *kernemu;
uint64_t *regvals;
int *regnums;
#ifdef BHYVE_SNAPSHOT
struct vm_snapshot_meta *snapshot_meta;
#endif
error = vmm_priv_check(curthread->td_ucred);
if (error)
return (error);
sc = vmmdev_lookup2(cdev);
if (sc == NULL)
return (ENXIO);
vcpu = -1;
state_changed = 0;
/*
* Some VMM ioctls can operate only on vcpus that are not running.
*/
switch (cmd) {
case VM_RUN:
case VM_GET_REGISTER:
case VM_SET_REGISTER:
case VM_GET_SEGMENT_DESCRIPTOR:
case VM_SET_SEGMENT_DESCRIPTOR:
case VM_GET_REGISTER_SET:
case VM_SET_REGISTER_SET:
case VM_INJECT_EXCEPTION:
case VM_GET_CAPABILITY:
case VM_SET_CAPABILITY:
case VM_PPTDEV_MSI:
case VM_PPTDEV_MSIX:
case VM_SET_X2APIC_STATE:
case VM_GLA2GPA:
case VM_GLA2GPA_NOFAULT:
case VM_ACTIVATE_CPU:
case VM_SET_INTINFO:
case VM_GET_INTINFO:
case VM_RESTART_INSTRUCTION:
/*
* XXX fragile, handle with care
* Assumes that the first field of the ioctl data is the vcpu.
*/
vcpu = *(int *)data;
error = vcpu_lock_one(sc, vcpu);
if (error)
goto done;
state_changed = 1;
break;
case VM_MAP_PPTDEV_MMIO:
case VM_BIND_PPTDEV:
case VM_UNBIND_PPTDEV:
#ifdef COMPAT_FREEBSD12
case VM_ALLOC_MEMSEG_FBSD12:
#endif
case VM_ALLOC_MEMSEG:
case VM_MMAP_MEMSEG:
case VM_REINIT:
/*
* ioctls that operate on the entire virtual machine must
* prevent all vcpus from running.
*/
error = vcpu_lock_all(sc);
if (error)
goto done;
state_changed = 2;
break;
#ifdef COMPAT_FREEBSD12
case VM_GET_MEMSEG_FBSD12:
#endif
case VM_GET_MEMSEG:
case VM_MMAP_GETNEXT:
/*
* Lock a vcpu to make sure that the memory map cannot be
* modified while it is being inspected.
*/
vcpu = vm_get_maxcpus(sc->vm) - 1;
error = vcpu_lock_one(sc, vcpu);
if (error)
goto done;
state_changed = 1;
break;
default:
break;
}
switch(cmd) {
case VM_RUN:
vmrun = (struct vm_run *)data;
error = vm_run(sc->vm, vmrun);
break;
case VM_SUSPEND:
vmsuspend = (struct vm_suspend *)data;
error = vm_suspend(sc->vm, vmsuspend->how);
break;
case VM_REINIT:
error = vm_reinit(sc->vm);
break;
case VM_STAT_DESC: {
statdesc = (struct vm_stat_desc *)data;
error = vmm_stat_desc_copy(statdesc->index,
statdesc->desc, sizeof(statdesc->desc));
break;
}
case VM_STATS: {
CTASSERT(MAX_VM_STATS >= MAX_VMM_STAT_ELEMS);
vmstats = (struct vm_stats *)data;
getmicrotime(&vmstats->tv);
error = vmm_stat_copy(sc->vm, vmstats->cpuid,
&vmstats->num_entries, vmstats->statbuf);
break;
}
case VM_PPTDEV_MSI:
pptmsi = (struct vm_pptdev_msi *)data;
error = ppt_setup_msi(sc->vm, pptmsi->vcpu,
pptmsi->bus, pptmsi->slot, pptmsi->func,
pptmsi->addr, pptmsi->msg,
pptmsi->numvec);
break;
case VM_PPTDEV_MSIX:
pptmsix = (struct vm_pptdev_msix *)data;
error = ppt_setup_msix(sc->vm, pptmsix->vcpu,
pptmsix->bus, pptmsix->slot,
pptmsix->func, pptmsix->idx,
pptmsix->addr, pptmsix->msg,
pptmsix->vector_control);
break;
case VM_PPTDEV_DISABLE_MSIX:
pptdev = (struct vm_pptdev *)data;
error = ppt_disable_msix(sc->vm, pptdev->bus, pptdev->slot,
pptdev->func);
break;
case VM_MAP_PPTDEV_MMIO:
pptmmio = (struct vm_pptdev_mmio *)data;
error = ppt_map_mmio(sc->vm, pptmmio->bus, pptmmio->slot,
pptmmio->func, pptmmio->gpa, pptmmio->len,
pptmmio->hpa);
break;
case VM_BIND_PPTDEV:
pptdev = (struct vm_pptdev *)data;
error = vm_assign_pptdev(sc->vm, pptdev->bus, pptdev->slot,
pptdev->func);
break;
case VM_UNBIND_PPTDEV:
pptdev = (struct vm_pptdev *)data;
error = vm_unassign_pptdev(sc->vm, pptdev->bus, pptdev->slot,
pptdev->func);
break;
case VM_INJECT_EXCEPTION:
vmexc = (struct vm_exception *)data;
error = vm_inject_exception(sc->vm, vmexc->cpuid,
vmexc->vector, vmexc->error_code_valid, vmexc->error_code,
vmexc->restart_instruction);
break;
case VM_INJECT_NMI:
vmnmi = (struct vm_nmi *)data;
error = vm_inject_nmi(sc->vm, vmnmi->cpuid);
break;
case VM_LAPIC_IRQ:
vmirq = (struct vm_lapic_irq *)data;
error = lapic_intr_edge(sc->vm, vmirq->cpuid, vmirq->vector);
break;
case VM_LAPIC_LOCAL_IRQ:
vmirq = (struct vm_lapic_irq *)data;
error = lapic_set_local_intr(sc->vm, vmirq->cpuid,
vmirq->vector);
break;
case VM_LAPIC_MSI:
vmmsi = (struct vm_lapic_msi *)data;
error = lapic_intr_msi(sc->vm, vmmsi->addr, vmmsi->msg);
break;
case VM_IOAPIC_ASSERT_IRQ:
ioapic_irq = (struct vm_ioapic_irq *)data;
error = vioapic_assert_irq(sc->vm, ioapic_irq->irq);
break;
case VM_IOAPIC_DEASSERT_IRQ:
ioapic_irq = (struct vm_ioapic_irq *)data;
error = vioapic_deassert_irq(sc->vm, ioapic_irq->irq);
break;
case VM_IOAPIC_PULSE_IRQ:
ioapic_irq = (struct vm_ioapic_irq *)data;
error = vioapic_pulse_irq(sc->vm, ioapic_irq->irq);
break;
case VM_IOAPIC_PINCOUNT:
*(int *)data = vioapic_pincount(sc->vm);
break;
case VM_SET_KERNEMU_DEV:
case VM_GET_KERNEMU_DEV: {
mem_region_write_t mwrite;
mem_region_read_t mread;
bool arg;
kernemu = (void *)data;
if (kernemu->access_width > 0)
size = (1u << kernemu->access_width);
else
size = 1;
if (kernemu->gpa >= DEFAULT_APIC_BASE && kernemu->gpa < DEFAULT_APIC_BASE + PAGE_SIZE) {
mread = lapic_mmio_read;
mwrite = lapic_mmio_write;
} else if (kernemu->gpa >= VIOAPIC_BASE && kernemu->gpa < VIOAPIC_BASE + VIOAPIC_SIZE) {
mread = vioapic_mmio_read;
mwrite = vioapic_mmio_write;
} else if (kernemu->gpa >= VHPET_BASE && kernemu->gpa < VHPET_BASE + VHPET_SIZE) {
mread = vhpet_mmio_read;
mwrite = vhpet_mmio_write;
} else {
error = EINVAL;
break;
}
if (cmd == VM_SET_KERNEMU_DEV)
error = mwrite(sc->vm, kernemu->vcpuid, kernemu->gpa,
kernemu->value, size, &arg);
else
error = mread(sc->vm, kernemu->vcpuid, kernemu->gpa,
&kernemu->value, size, &arg);
break;
}
case VM_ISA_ASSERT_IRQ:
isa_irq = (struct vm_isa_irq *)data;
error = vatpic_assert_irq(sc->vm, isa_irq->atpic_irq);
if (error == 0 && isa_irq->ioapic_irq != -1)
error = vioapic_assert_irq(sc->vm,
isa_irq->ioapic_irq);
break;
case VM_ISA_DEASSERT_IRQ:
isa_irq = (struct vm_isa_irq *)data;
error = vatpic_deassert_irq(sc->vm, isa_irq->atpic_irq);
if (error == 0 && isa_irq->ioapic_irq != -1)
error = vioapic_deassert_irq(sc->vm,
isa_irq->ioapic_irq);
break;
case VM_ISA_PULSE_IRQ:
isa_irq = (struct vm_isa_irq *)data;
error = vatpic_pulse_irq(sc->vm, isa_irq->atpic_irq);
if (error == 0 && isa_irq->ioapic_irq != -1)
error = vioapic_pulse_irq(sc->vm, isa_irq->ioapic_irq);
break;
case VM_ISA_SET_IRQ_TRIGGER:
isa_irq_trigger = (struct vm_isa_irq_trigger *)data;
error = vatpic_set_irq_trigger(sc->vm,
isa_irq_trigger->atpic_irq, isa_irq_trigger->trigger);
break;
case VM_MMAP_GETNEXT:
mm = (struct vm_memmap *)data;
error = vm_mmap_getnext(sc->vm, &mm->gpa, &mm->segid,
&mm->segoff, &mm->len, &mm->prot, &mm->flags);
break;
case VM_MMAP_MEMSEG:
mm = (struct vm_memmap *)data;
error = vm_mmap_memseg(sc->vm, mm->gpa, mm->segid, mm->segoff,
mm->len, mm->prot, mm->flags);
break;
#ifdef COMPAT_FREEBSD12
case VM_ALLOC_MEMSEG_FBSD12:
error = alloc_memseg(sc, (struct vm_memseg *)data,
sizeof(((struct vm_memseg_fbsd12 *)0)->name));
break;
#endif
case VM_ALLOC_MEMSEG:
error = alloc_memseg(sc, (struct vm_memseg *)data,
sizeof(((struct vm_memseg *)0)->name));
break;
#ifdef COMPAT_FREEBSD12
case VM_GET_MEMSEG_FBSD12:
error = get_memseg(sc, (struct vm_memseg *)data,
sizeof(((struct vm_memseg_fbsd12 *)0)->name));
break;
#endif
case VM_GET_MEMSEG:
error = get_memseg(sc, (struct vm_memseg *)data,
sizeof(((struct vm_memseg *)0)->name));
break;
case VM_GET_REGISTER:
vmreg = (struct vm_register *)data;
error = vm_get_register(sc->vm, vmreg->cpuid, vmreg->regnum,
&vmreg->regval);
break;
case VM_SET_REGISTER:
vmreg = (struct vm_register *)data;
error = vm_set_register(sc->vm, vmreg->cpuid, vmreg->regnum,
vmreg->regval);
break;
case VM_SET_SEGMENT_DESCRIPTOR:
vmsegdesc = (struct vm_seg_desc *)data;
error = vm_set_seg_desc(sc->vm, vmsegdesc->cpuid,
vmsegdesc->regnum,
&vmsegdesc->desc);
break;
case VM_GET_SEGMENT_DESCRIPTOR:
vmsegdesc = (struct vm_seg_desc *)data;
error = vm_get_seg_desc(sc->vm, vmsegdesc->cpuid,
vmsegdesc->regnum,
&vmsegdesc->desc);
break;
case VM_GET_REGISTER_SET:
vmregset = (struct vm_register_set *)data;
if (vmregset->count > VM_REG_LAST) {
error = EINVAL;
break;
}
regvals = malloc(sizeof(regvals[0]) * vmregset->count, M_VMMDEV,
M_WAITOK);
regnums = malloc(sizeof(regnums[0]) * vmregset->count, M_VMMDEV,
M_WAITOK);
error = copyin(vmregset->regnums, regnums, sizeof(regnums[0]) *
vmregset->count);
if (error == 0)
error = vm_get_register_set(sc->vm, vmregset->cpuid,
vmregset->count, regnums, regvals);
if (error == 0)
error = copyout(regvals, vmregset->regvals,
sizeof(regvals[0]) * vmregset->count);
free(regvals, M_VMMDEV);
free(regnums, M_VMMDEV);
break;
case VM_SET_REGISTER_SET:
vmregset = (struct vm_register_set *)data;
if (vmregset->count > VM_REG_LAST) {
error = EINVAL;
break;
}
regvals = malloc(sizeof(regvals[0]) * vmregset->count, M_VMMDEV,
M_WAITOK);
regnums = malloc(sizeof(regnums[0]) * vmregset->count, M_VMMDEV,
M_WAITOK);
error = copyin(vmregset->regnums, regnums, sizeof(regnums[0]) *
vmregset->count);
if (error == 0)
error = copyin(vmregset->regvals, regvals,
sizeof(regvals[0]) * vmregset->count);
if (error == 0)
error = vm_set_register_set(sc->vm, vmregset->cpuid,
vmregset->count, regnums, regvals);
free(regvals, M_VMMDEV);
free(regnums, M_VMMDEV);
break;
case VM_GET_CAPABILITY:
vmcap = (struct vm_capability *)data;
error = vm_get_capability(sc->vm, vmcap->cpuid,
vmcap->captype,
&vmcap->capval);
break;
case VM_SET_CAPABILITY:
vmcap = (struct vm_capability *)data;
error = vm_set_capability(sc->vm, vmcap->cpuid,
vmcap->captype,
vmcap->capval);
break;
case VM_SET_X2APIC_STATE:
x2apic = (struct vm_x2apic *)data;
error = vm_set_x2apic_state(sc->vm,
x2apic->cpuid, x2apic->state);
break;
case VM_GET_X2APIC_STATE:
x2apic = (struct vm_x2apic *)data;
error = vm_get_x2apic_state(sc->vm,
x2apic->cpuid, &x2apic->state);
break;
case VM_GET_GPA_PMAP:
gpapte = (struct vm_gpa_pte *)data;
pmap_get_mapping(vmspace_pmap(vm_get_vmspace(sc->vm)),
gpapte->gpa, gpapte->pte, &gpapte->ptenum);
error = 0;
break;
case VM_GET_HPET_CAPABILITIES:
error = vhpet_getcap((struct vm_hpet_cap *)data);
break;
case VM_GLA2GPA: {
CTASSERT(PROT_READ == VM_PROT_READ);
CTASSERT(PROT_WRITE == VM_PROT_WRITE);
CTASSERT(PROT_EXEC == VM_PROT_EXECUTE);
gg = (struct vm_gla2gpa *)data;
error = vm_gla2gpa(sc->vm, gg->vcpuid, &gg->paging, gg->gla,
gg->prot, &gg->gpa, &gg->fault);
KASSERT(error == 0 || error == EFAULT,
("%s: vm_gla2gpa unknown error %d", __func__, error));
break;
}
case VM_GLA2GPA_NOFAULT:
gg = (struct vm_gla2gpa *)data;
error = vm_gla2gpa_nofault(sc->vm, gg->vcpuid, &gg->paging,
gg->gla, gg->prot, &gg->gpa, &gg->fault);
KASSERT(error == 0 || error == EFAULT,
("%s: vm_gla2gpa unknown error %d", __func__, error));
break;
case VM_ACTIVATE_CPU:
vac = (struct vm_activate_cpu *)data;
error = vm_activate_cpu(sc->vm, vac->vcpuid);
break;
case VM_GET_CPUS:
error = 0;
vm_cpuset = (struct vm_cpuset *)data;
size = vm_cpuset->cpusetsize;
if (size < sizeof(cpuset_t) || size > CPU_MAXSIZE / NBBY) {
error = ERANGE;
break;
}
cpuset = malloc(size, M_TEMP, M_WAITOK | M_ZERO);
if (vm_cpuset->which == VM_ACTIVE_CPUS)
*cpuset = vm_active_cpus(sc->vm);
else if (vm_cpuset->which == VM_SUSPENDED_CPUS)
*cpuset = vm_suspended_cpus(sc->vm);
else if (vm_cpuset->which == VM_DEBUG_CPUS)
*cpuset = vm_debug_cpus(sc->vm);
else
error = EINVAL;
if (error == 0)
error = copyout(cpuset, vm_cpuset->cpus, size);
free(cpuset, M_TEMP);
break;
case VM_SUSPEND_CPU:
vac = (struct vm_activate_cpu *)data;
error = vm_suspend_cpu(sc->vm, vac->vcpuid);
break;
case VM_RESUME_CPU:
vac = (struct vm_activate_cpu *)data;
error = vm_resume_cpu(sc->vm, vac->vcpuid);
break;
case VM_SET_INTINFO:
vmii = (struct vm_intinfo *)data;
error = vm_exit_intinfo(sc->vm, vmii->vcpuid, vmii->info1);
break;
case VM_GET_INTINFO:
vmii = (struct vm_intinfo *)data;
error = vm_get_intinfo(sc->vm, vmii->vcpuid, &vmii->info1,
&vmii->info2);
break;
case VM_RTC_WRITE:
rtcdata = (struct vm_rtc_data *)data;
error = vrtc_nvram_write(sc->vm, rtcdata->offset,
rtcdata->value);
break;
case VM_RTC_READ:
rtcdata = (struct vm_rtc_data *)data;
error = vrtc_nvram_read(sc->vm, rtcdata->offset,
&rtcdata->value);
break;
case VM_RTC_SETTIME:
rtctime = (struct vm_rtc_time *)data;
error = vrtc_set_time(sc->vm, rtctime->secs);
break;
case VM_RTC_GETTIME:
error = 0;
rtctime = (struct vm_rtc_time *)data;
rtctime->secs = vrtc_get_time(sc->vm);
break;
case VM_RESTART_INSTRUCTION:
error = vm_restart_instruction(sc->vm, vcpu);
break;
case VM_SET_TOPOLOGY:
topology = (struct vm_cpu_topology *)data;
error = vm_set_topology(sc->vm, topology->sockets,
topology->cores, topology->threads, topology->maxcpus);
break;
case VM_GET_TOPOLOGY:
topology = (struct vm_cpu_topology *)data;
vm_get_topology(sc->vm, &topology->sockets, &topology->cores,
&topology->threads, &topology->maxcpus);
error = 0;
break;
#ifdef BHYVE_SNAPSHOT
case VM_SNAPSHOT_REQ:
snapshot_meta = (struct vm_snapshot_meta *)data;
error = vm_snapshot_req(sc->vm, snapshot_meta);
break;
case VM_RESTORE_TIME:
error = vm_restore_time(sc->vm);
break;
#endif
default:
error = ENOTTY;
break;
}
if (state_changed == 1)
vcpu_unlock_one(sc, vcpu);
else if (state_changed == 2)
vcpu_unlock_all(sc);
done:
/*
* Make sure that no handler returns a kernel-internal
* error value to userspace.
*/
KASSERT(error == ERESTART || error >= 0,
("vmmdev_ioctl: invalid error return %d", error));
return (error);
}
static int
vmmdev_mmap_single(struct cdev *cdev, vm_ooffset_t *offset, vm_size_t mapsize,
struct vm_object **objp, int nprot)
{
struct vmmdev_softc *sc;
vm_paddr_t gpa;
size_t len;
vm_ooffset_t segoff, first, last;
int error, found, segid;
uint16_t lastcpu;
bool sysmem;
error = vmm_priv_check(curthread->td_ucred);
if (error)
return (error);
first = *offset;
last = first + mapsize;
if ((nprot & PROT_EXEC) || first < 0 || first >= last)
return (EINVAL);
sc = vmmdev_lookup2(cdev);
if (sc == NULL) {
/* virtual machine is in the process of being created */
return (EINVAL);
}
/*
* Get a read lock on the guest memory map by freezing any vcpu.
*/
lastcpu = vm_get_maxcpus(sc->vm) - 1;
error = vcpu_lock_one(sc, lastcpu);
if (error)
return (error);
gpa = 0;
found = 0;
while (!found) {
error = vm_mmap_getnext(sc->vm, &gpa, &segid, &segoff, &len,
NULL, NULL);
if (error)
break;
if (first >= gpa && last <= gpa + len)
found = 1;
else
gpa += len;
}
if (found) {
error = vm_get_memseg(sc->vm, segid, &len, &sysmem, objp);
KASSERT(error == 0 && *objp != NULL,
("%s: invalid memory segment %d", __func__, segid));
if (sysmem) {
vm_object_reference(*objp);
*offset = segoff + (first - gpa);
} else {
error = EINVAL;
}
}
vcpu_unlock_one(sc, lastcpu);
return (error);
}
static void
vmmdev_destroy(void *arg)
{
struct vmmdev_softc *sc = arg;
struct devmem_softc *dsc;
int error;
error = vcpu_lock_all(sc);
KASSERT(error == 0, ("%s: error %d freezing vcpus", __func__, error));
while ((dsc = SLIST_FIRST(&sc->devmem)) != NULL) {
KASSERT(dsc->cdev == NULL, ("%s: devmem not free", __func__));
SLIST_REMOVE_HEAD(&sc->devmem, link);
free(dsc->name, M_VMMDEV);
free(dsc, M_VMMDEV);
}
if (sc->cdev != NULL)
destroy_dev(sc->cdev);
if (sc->vm != NULL)
vm_destroy(sc->vm);
if ((sc->flags & VSC_LINKED) != 0) {
mtx_lock(&vmmdev_mtx);
SLIST_REMOVE(&head, sc, vmmdev_softc, link);
mtx_unlock(&vmmdev_mtx);
}
free(sc, M_VMMDEV);
}
static int
sysctl_vmm_destroy(SYSCTL_HANDLER_ARGS)
{
struct devmem_softc *dsc;
struct vmmdev_softc *sc;
struct cdev *cdev;
char *buf;
int error, buflen;
error = vmm_priv_check(req->td->td_ucred);
if (error)
return (error);
buflen = VM_MAX_NAMELEN + 1;
buf = malloc(buflen, M_VMMDEV, M_WAITOK | M_ZERO);
strlcpy(buf, "beavis", buflen);
error = sysctl_handle_string(oidp, buf, buflen, req);
if (error != 0 || req->newptr == NULL)
goto out;
mtx_lock(&vmmdev_mtx);
sc = vmmdev_lookup(buf);
if (sc == NULL || sc->cdev == NULL) {
mtx_unlock(&vmmdev_mtx);
error = EINVAL;
goto out;
}
/*
* The 'cdev' will be destroyed asynchronously when 'si_threadcount'
* goes down to 0 so we should not do it again in the callback.
*
* Setting 'sc->cdev' to NULL is also used to indicate that the VM
* is scheduled for destruction.
*/
cdev = sc->cdev;
sc->cdev = NULL;
mtx_unlock(&vmmdev_mtx);
/*
* Schedule all cdevs to be destroyed:
*
* - any new operations on the 'cdev' will return an error (ENXIO).
*
* - when the 'si_threadcount' dwindles down to zero the 'cdev' will
* be destroyed and the callback will be invoked in a taskqueue
* context.
*
* - the 'devmem' cdevs are destroyed before the virtual machine 'cdev'
*/
SLIST_FOREACH(dsc, &sc->devmem, link) {
KASSERT(dsc->cdev != NULL, ("devmem cdev already destroyed"));
destroy_dev_sched_cb(dsc->cdev, devmem_destroy, dsc);
}
destroy_dev_sched_cb(cdev, vmmdev_destroy, sc);
error = 0;
out:
free(buf, M_VMMDEV);
return (error);
}
SYSCTL_PROC(_hw_vmm, OID_AUTO, destroy,
CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
NULL, 0, sysctl_vmm_destroy, "A",
NULL);
static struct cdevsw vmmdevsw = {
.d_name = "vmmdev",
.d_version = D_VERSION,
.d_ioctl = vmmdev_ioctl,
.d_mmap_single = vmmdev_mmap_single,
.d_read = vmmdev_rw,
.d_write = vmmdev_rw,
};
static int
sysctl_vmm_create(SYSCTL_HANDLER_ARGS)
{
struct vm *vm;
struct cdev *cdev;
struct vmmdev_softc *sc, *sc2;
char *buf;
int error, buflen;
error = vmm_priv_check(req->td->td_ucred);
if (error)
return (error);
buflen = VM_MAX_NAMELEN + 1;
buf = malloc(buflen, M_VMMDEV, M_WAITOK | M_ZERO);
strlcpy(buf, "beavis", buflen);
error = sysctl_handle_string(oidp, buf, buflen, req);
if (error != 0 || req->newptr == NULL)
goto out;
mtx_lock(&vmmdev_mtx);
sc = vmmdev_lookup(buf);
mtx_unlock(&vmmdev_mtx);
if (sc != NULL) {
error = EEXIST;
goto out;
}
error = vm_create(buf, &vm);
if (error != 0)
goto out;
sc = malloc(sizeof(struct vmmdev_softc), M_VMMDEV, M_WAITOK | M_ZERO);
sc->vm = vm;
SLIST_INIT(&sc->devmem);
/*
* Lookup the name again just in case somebody sneaked in when we
* dropped the lock.
*/
mtx_lock(&vmmdev_mtx);
sc2 = vmmdev_lookup(buf);
if (sc2 == NULL) {
SLIST_INSERT_HEAD(&head, sc, link);
sc->flags |= VSC_LINKED;
}
mtx_unlock(&vmmdev_mtx);
if (sc2 != NULL) {
vmmdev_destroy(sc);
error = EEXIST;
goto out;
}
error = make_dev_p(MAKEDEV_CHECKNAME, &cdev, &vmmdevsw, NULL,
UID_ROOT, GID_WHEEL, 0600, "vmm/%s", buf);
if (error != 0) {
vmmdev_destroy(sc);
goto out;
}
mtx_lock(&vmmdev_mtx);
sc->cdev = cdev;
sc->cdev->si_drv1 = sc;
mtx_unlock(&vmmdev_mtx);
out:
free(buf, M_VMMDEV);
return (error);
}
SYSCTL_PROC(_hw_vmm, OID_AUTO, create,
CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
NULL, 0, sysctl_vmm_create, "A",
NULL);
void
vmmdev_init(void)
{
mtx_init(&vmmdev_mtx, "vmm device mutex", NULL, MTX_DEF);
pr_allow_flag = prison_add_allow(NULL, "vmm", NULL,
"Allow use of vmm in a jail.");
}
int
vmmdev_cleanup(void)
{
int error;
if (SLIST_EMPTY(&head))
error = 0;
else
error = EBUSY;
return (error);
}
static int
devmem_mmap_single(struct cdev *cdev, vm_ooffset_t *offset, vm_size_t len,
struct vm_object **objp, int nprot)
{
struct devmem_softc *dsc;
vm_ooffset_t first, last;
size_t seglen;
int error;
uint16_t lastcpu;
bool sysmem;
dsc = cdev->si_drv1;
if (dsc == NULL) {
/* 'cdev' has been created but is not ready for use */
return (ENXIO);
}
first = *offset;
last = *offset + len;
if ((nprot & PROT_EXEC) || first < 0 || first >= last)
return (EINVAL);
lastcpu = vm_get_maxcpus(dsc->sc->vm) - 1;
error = vcpu_lock_one(dsc->sc, lastcpu);
if (error)
return (error);
error = vm_get_memseg(dsc->sc->vm, dsc->segid, &seglen, &sysmem, objp);
KASSERT(error == 0 && !sysmem && *objp != NULL,
("%s: invalid devmem segment %d", __func__, dsc->segid));
vcpu_unlock_one(dsc->sc, lastcpu);
if (seglen >= last) {
vm_object_reference(*objp);
return (0);
} else {
return (EINVAL);
}
}
static struct cdevsw devmemsw = {
.d_name = "devmem",
.d_version = D_VERSION,
.d_mmap_single = devmem_mmap_single,
};
static int
devmem_create_cdev(const char *vmname, int segid, char *devname)
{
struct devmem_softc *dsc;
struct vmmdev_softc *sc;
struct cdev *cdev;
int error;
error = make_dev_p(MAKEDEV_CHECKNAME, &cdev, &devmemsw, NULL,
UID_ROOT, GID_WHEEL, 0600, "vmm.io/%s.%s", vmname, devname);
if (error)
return (error);
dsc = malloc(sizeof(struct devmem_softc), M_VMMDEV, M_WAITOK | M_ZERO);
mtx_lock(&vmmdev_mtx);
sc = vmmdev_lookup(vmname);
KASSERT(sc != NULL, ("%s: vm %s softc not found", __func__, vmname));
if (sc->cdev == NULL) {
/* virtual machine is being created or destroyed */
mtx_unlock(&vmmdev_mtx);
free(dsc, M_VMMDEV);
destroy_dev_sched_cb(cdev, NULL, 0);
return (ENODEV);
}
dsc->segid = segid;
dsc->name = devname;
dsc->cdev = cdev;
dsc->sc = sc;
SLIST_INSERT_HEAD(&sc->devmem, dsc, link);
mtx_unlock(&vmmdev_mtx);
/* The 'cdev' is ready for use after 'si_drv1' is initialized */
cdev->si_drv1 = dsc;
return (0);
}
static void
devmem_destroy(void *arg)
{
struct devmem_softc *dsc = arg;
KASSERT(dsc->cdev, ("%s: devmem cdev already destroyed", __func__));
dsc->cdev = NULL;
dsc->sc = NULL;
}
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