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bhyverun.c
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bhyverun.c
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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 <sys/types.h>
#ifndef WITHOUT_CAPSICUM
#include <sys/capsicum.h>
#include <libcasper.h>
#include <casper/cap_sysctl.h>
#endif
#include <sys/mman.h>
#ifdef BHYVE_SNAPSHOT
#include <sys/socket.h>
#include <sys/stat.h>
#endif
#include <sys/time.h>
#ifdef BHYVE_SNAPSHOT
#include <sys/un.h>
#endif
#include <amd64/vmm/intel/vmcs.h>
#include <machine/atomic.h>
#include <machine/segments.h>
#ifndef WITHOUT_CAPSICUM
#include <capsicum_helpers.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <err.h>
#include <errno.h>
#ifdef BHYVE_SNAPSHOT
#include <fcntl.h>
#endif
#include <libgen.h>
#include <unistd.h>
#include <assert.h>
#include <pthread.h>
#include <pthread_np.h>
#include <sysexits.h>
#include <stdbool.h>
#include <stdint.h>
#ifdef BHYVE_SNAPSHOT
#include <ucl.h>
#include <unistd.h>
#include <libxo/xo.h>
#endif
#include <machine/vmm.h>
#ifndef WITHOUT_CAPSICUM
#include <machine/vmm_dev.h>
#endif
#include <machine/vmm_instruction_emul.h>
#include <vmmapi.h>
#include "bhyverun.h"
#include "acpi.h"
#include "atkbdc.h"
#include "bootrom.h"
#include "config.h"
#include "inout.h"
#include "debug.h"
#include "fwctl.h"
#include "gdb.h"
#include "ioapic.h"
#include "kernemu_dev.h"
#include "mem.h"
#include "mevent.h"
#include "mptbl.h"
#include "pci_emul.h"
#include "pci_irq.h"
#include "pci_lpc.h"
#include "smbiostbl.h"
#ifdef BHYVE_SNAPSHOT
#include "snapshot.h"
#endif
#include "xmsr.h"
#include "spinup_ap.h"
#include "rtc.h"
#include "vmgenc.h"
#define GUEST_NIO_PORT 0x488 /* guest upcalls via i/o port */
#define MB (1024UL * 1024)
#define GB (1024UL * MB)
static const char * const vmx_exit_reason_desc[] = {
[EXIT_REASON_EXCEPTION] = "Exception or non-maskable interrupt (NMI)",
[EXIT_REASON_EXT_INTR] = "External interrupt",
[EXIT_REASON_TRIPLE_FAULT] = "Triple fault",
[EXIT_REASON_INIT] = "INIT signal",
[EXIT_REASON_SIPI] = "Start-up IPI (SIPI)",
[EXIT_REASON_IO_SMI] = "I/O system-management interrupt (SMI)",
[EXIT_REASON_SMI] = "Other SMI",
[EXIT_REASON_INTR_WINDOW] = "Interrupt window",
[EXIT_REASON_NMI_WINDOW] = "NMI window",
[EXIT_REASON_TASK_SWITCH] = "Task switch",
[EXIT_REASON_CPUID] = "CPUID",
[EXIT_REASON_GETSEC] = "GETSEC",
[EXIT_REASON_HLT] = "HLT",
[EXIT_REASON_INVD] = "INVD",
[EXIT_REASON_INVLPG] = "INVLPG",
[EXIT_REASON_RDPMC] = "RDPMC",
[EXIT_REASON_RDTSC] = "RDTSC",
[EXIT_REASON_RSM] = "RSM",
[EXIT_REASON_VMCALL] = "VMCALL",
[EXIT_REASON_VMCLEAR] = "VMCLEAR",
[EXIT_REASON_VMLAUNCH] = "VMLAUNCH",
[EXIT_REASON_VMPTRLD] = "VMPTRLD",
[EXIT_REASON_VMPTRST] = "VMPTRST",
[EXIT_REASON_VMREAD] = "VMREAD",
[EXIT_REASON_VMRESUME] = "VMRESUME",
[EXIT_REASON_VMWRITE] = "VMWRITE",
[EXIT_REASON_VMXOFF] = "VMXOFF",
[EXIT_REASON_VMXON] = "VMXON",
[EXIT_REASON_CR_ACCESS] = "Control-register accesses",
[EXIT_REASON_DR_ACCESS] = "MOV DR",
[EXIT_REASON_INOUT] = "I/O instruction",
[EXIT_REASON_RDMSR] = "RDMSR",
[EXIT_REASON_WRMSR] = "WRMSR",
[EXIT_REASON_INVAL_VMCS] =
"VM-entry failure due to invalid guest state",
[EXIT_REASON_INVAL_MSR] = "VM-entry failure due to MSR loading",
[EXIT_REASON_MWAIT] = "MWAIT",
[EXIT_REASON_MTF] = "Monitor trap flag",
[EXIT_REASON_MONITOR] = "MONITOR",
[EXIT_REASON_PAUSE] = "PAUSE",
[EXIT_REASON_MCE_DURING_ENTRY] =
"VM-entry failure due to machine-check event",
[EXIT_REASON_TPR] = "TPR below threshold",
[EXIT_REASON_APIC_ACCESS] = "APIC access",
[EXIT_REASON_VIRTUALIZED_EOI] = "Virtualized EOI",
[EXIT_REASON_GDTR_IDTR] = "Access to GDTR or IDTR",
[EXIT_REASON_LDTR_TR] = "Access to LDTR or TR",
[EXIT_REASON_EPT_FAULT] = "EPT violation",
[EXIT_REASON_EPT_MISCONFIG] = "EPT misconfiguration",
[EXIT_REASON_INVEPT] = "INVEPT",
[EXIT_REASON_RDTSCP] = "RDTSCP",
[EXIT_REASON_VMX_PREEMPT] = "VMX-preemption timer expired",
[EXIT_REASON_INVVPID] = "INVVPID",
[EXIT_REASON_WBINVD] = "WBINVD",
[EXIT_REASON_XSETBV] = "XSETBV",
[EXIT_REASON_APIC_WRITE] = "APIC write",
[EXIT_REASON_RDRAND] = "RDRAND",
[EXIT_REASON_INVPCID] = "INVPCID",
[EXIT_REASON_VMFUNC] = "VMFUNC",
[EXIT_REASON_ENCLS] = "ENCLS",
[EXIT_REASON_RDSEED] = "RDSEED",
[EXIT_REASON_PM_LOG_FULL] = "Page-modification log full",
[EXIT_REASON_XSAVES] = "XSAVES",
[EXIT_REASON_XRSTORS] = "XRSTORS"
};
typedef int (*vmexit_handler_t)(struct vmctx *, struct vm_exit *, int *vcpu);
extern int vmexit_task_switch(struct vmctx *, struct vm_exit *, int *vcpu);
int guest_ncpus;
uint16_t cores, maxcpus, sockets, threads;
int raw_stdio = 0;
static char *progname;
static const int BSP = 0;
static cpuset_t cpumask;
static void vm_loop(struct vmctx *ctx, int vcpu, uint64_t rip);
static struct vm_exit vmexit[VM_MAXCPU];
struct bhyvestats {
uint64_t vmexit_bogus;
uint64_t vmexit_reqidle;
uint64_t vmexit_hlt;
uint64_t vmexit_pause;
uint64_t vmexit_mtrap;
uint64_t vmexit_inst_emul;
uint64_t cpu_switch_rotate;
uint64_t cpu_switch_direct;
} stats;
struct mt_vmm_info {
pthread_t mt_thr;
struct vmctx *mt_ctx;
int mt_vcpu;
} mt_vmm_info[VM_MAXCPU];
static cpuset_t *vcpumap[VM_MAXCPU] = { NULL };
static void
usage(int code)
{
fprintf(stderr,
"Usage: %s [-aehuwxACDHPSWY]\n"
" %*s [-c [[cpus=]numcpus][,sockets=n][,cores=n][,threads=n]]\n"
" %*s [-k <file>] [-l <lpc>] [-m mem] [-o <var>=<value>]\n"
" %*s [-p vcpu:hostcpu] [-s <pci>] [-U uuid] [<vm>]\n"
" -a: local apic is in xAPIC mode (deprecated)\n"
" -A: create ACPI tables\n"
" -c: number of cpus and/or topology specification\n"
" -C: include guest memory in core file\n"
" -D: destroy on power-off\n"
" -e: exit on unhandled I/O access\n"
" -h: help\n"
" -H: vmexit from the guest on hlt\n"
" -k: key=value flat config file\n"
" -l: LPC device configuration\n"
" -m: memory size in MB\n"
" -o: set config 'var' to 'value'\n"
" -p: pin 'vcpu' to 'hostcpu'\n"
" -P: vmexit from the guest on pause\n"
#ifdef BHYVE_SNAPSHOT
" -r: path to checkpoint file\n"
#endif
" -s: <slot,driver,configinfo> PCI slot config\n"
" -S: guest memory cannot be swapped\n"
" -u: RTC keeps UTC time\n"
" -U: uuid\n"
" -w: ignore unimplemented MSRs\n"
" -W: force virtio to use single-vector MSI\n"
" -x: local apic is in x2APIC mode\n"
" -Y: disable MPtable generation\n",
progname, (int)strlen(progname), "", (int)strlen(progname), "",
(int)strlen(progname), "");
exit(code);
}
/*
* XXX This parser is known to have the following issues:
* 1. It accepts null key=value tokens ",," as setting "cpus" to an
* empty string.
*
* The acceptance of a null specification ('-c ""') is by design to match the
* manual page syntax specification, this results in a topology of 1 vCPU.
*/
static int
topology_parse(const char *opt)
{
char *cp, *str;
if (*opt == '\0') {
set_config_value("sockets", "1");
set_config_value("cores", "1");
set_config_value("threads", "1");
set_config_value("cpus", "1");
return (0);
}
str = strdup(opt);
if (str == NULL)
errx(4, "Failed to allocate memory");
while ((cp = strsep(&str, ",")) != NULL) {
if (strncmp(cp, "cpus=", strlen("cpus=")) == 0)
set_config_value("cpus", cp + strlen("cpus="));
else if (strncmp(cp, "sockets=", strlen("sockets=")) == 0)
set_config_value("sockets", cp + strlen("sockets="));
else if (strncmp(cp, "cores=", strlen("cores=")) == 0)
set_config_value("cores", cp + strlen("cores="));
else if (strncmp(cp, "threads=", strlen("threads=")) == 0)
set_config_value("threads", cp + strlen("threads="));
#ifdef notyet /* Do not expose this until vmm.ko implements it */
else if (strncmp(cp, "maxcpus=", strlen("maxcpus=")) == 0)
set_config_value("maxcpus", cp + strlen("maxcpus="));
#endif
else if (strchr(cp, '=') != NULL)
goto out;
else
set_config_value("cpus", cp);
}
free(str);
return (0);
out:
free(str);
return (-1);
}
static int
parse_int_value(const char *key, const char *value, int minval, int maxval)
{
char *cp;
long lval;
errno = 0;
lval = strtol(value, &cp, 0);
if (errno != 0 || *cp != '\0' || cp == value || lval < minval ||
lval > maxval)
errx(4, "Invalid value for %s: '%s'", key, value);
return (lval);
}
/*
* Set the sockets, cores, threads, and guest_cpus variables based on
* the configured topology.
*
* The limits of UINT16_MAX are due to the types passed to
* vm_set_topology(). vmm.ko may enforce tighter limits.
*/
static void
calc_topolopgy(void)
{
const char *value;
bool explicit_cpus;
uint64_t ncpus;
value = get_config_value("cpus");
if (value != NULL) {
guest_ncpus = parse_int_value("cpus", value, 1, UINT16_MAX);
explicit_cpus = true;
} else {
guest_ncpus = 1;
explicit_cpus = false;
}
value = get_config_value("cores");
if (value != NULL)
cores = parse_int_value("cores", value, 1, UINT16_MAX);
else
cores = 1;
value = get_config_value("threads");
if (value != NULL)
threads = parse_int_value("threads", value, 1, UINT16_MAX);
else
threads = 1;
value = get_config_value("sockets");
if (value != NULL)
sockets = parse_int_value("sockets", value, 1, UINT16_MAX);
else
sockets = guest_ncpus;
/*
* Compute sockets * cores * threads avoiding overflow. The
* range check above insures these are 16 bit values.
*/
ncpus = (uint64_t)sockets * cores * threads;
if (ncpus > UINT16_MAX)
errx(4, "Computed number of vCPUs too high: %ju",
(uintmax_t)ncpus);
if (explicit_cpus) {
if (guest_ncpus != ncpus)
errx(4, "Topology (%d sockets, %d cores, %d threads) "
"does not match %d vCPUs", sockets, cores, threads,
guest_ncpus);
} else
guest_ncpus = ncpus;
}
static int
pincpu_parse(const char *opt)
{
const char *value;
char *newval;
char key[16];
int vcpu, pcpu;
if (sscanf(opt, "%d:%d", &vcpu, &pcpu) != 2) {
fprintf(stderr, "invalid format: %s\n", opt);
return (-1);
}
if (vcpu < 0 || vcpu >= VM_MAXCPU) {
fprintf(stderr, "vcpu '%d' outside valid range from 0 to %d\n",
vcpu, VM_MAXCPU - 1);
return (-1);
}
if (pcpu < 0 || pcpu >= CPU_SETSIZE) {
fprintf(stderr, "hostcpu '%d' outside valid range from "
"0 to %d\n", pcpu, CPU_SETSIZE - 1);
return (-1);
}
snprintf(key, sizeof(key), "vcpu.%d.cpuset", vcpu);
value = get_config_value(key);
if (asprintf(&newval, "%s%s%d", value != NULL ? value : "",
value != NULL ? "," : "", pcpu) == -1) {
perror("failed to build new cpuset string");
return (-1);
}
set_config_value(key, newval);
free(newval);
return (0);
}
static void
parse_cpuset(int vcpu, const char *list, cpuset_t *set)
{
char *cp, *token;
int pcpu, start;
CPU_ZERO(set);
start = -1;
token = __DECONST(char *, list);
for (;;) {
pcpu = strtoul(token, &cp, 0);
if (cp == token)
errx(4, "invalid cpuset for vcpu %d: '%s'", vcpu, list);
if (pcpu < 0 || pcpu >= CPU_SETSIZE)
errx(4, "hostcpu '%d' outside valid range from 0 to %d",
pcpu, CPU_SETSIZE - 1);
switch (*cp) {
case ',':
case '\0':
if (start >= 0) {
if (start > pcpu)
errx(4, "Invalid hostcpu range %d-%d",
start, pcpu);
while (start < pcpu) {
CPU_SET(start, vcpumap[vcpu]);
start++;
}
start = -1;
}
CPU_SET(pcpu, vcpumap[vcpu]);
break;
case '-':
if (start >= 0)
errx(4, "invalid cpuset for vcpu %d: '%s'",
vcpu, list);
start = pcpu;
break;
default:
errx(4, "invalid cpuset for vcpu %d: '%s'", vcpu, list);
}
if (*cp == '\0')
break;
token = cp + 1;
}
}
static void
build_vcpumaps(void)
{
char key[16];
const char *value;
int vcpu;
for (vcpu = 0; vcpu < guest_ncpus; vcpu++) {
snprintf(key, sizeof(key), "vcpu.%d.cpuset", vcpu);
value = get_config_value(key);
if (value == NULL)
continue;
vcpumap[vcpu] = malloc(sizeof(cpuset_t));
if (vcpumap[vcpu] == NULL)
err(4, "Failed to allocate cpuset for vcpu %d", vcpu);
parse_cpuset(vcpu, value, vcpumap[vcpu]);
}
}
void
vm_inject_fault(void *arg, int vcpu, int vector, int errcode_valid,
int errcode)
{
struct vmctx *ctx;
int error, restart_instruction;
ctx = arg;
restart_instruction = 1;
error = vm_inject_exception(ctx, vcpu, vector, errcode_valid, errcode,
restart_instruction);
assert(error == 0);
}
void *
paddr_guest2host(struct vmctx *ctx, uintptr_t gaddr, size_t len)
{
return (vm_map_gpa(ctx, gaddr, len));
}
#ifdef BHYVE_SNAPSHOT
uintptr_t
paddr_host2guest(struct vmctx *ctx, void *addr)
{
return (vm_rev_map_gpa(ctx, addr));
}
#endif
int
fbsdrun_virtio_msix(void)
{
return (get_config_bool_default("virtio_msix", true));
}
static void *
fbsdrun_start_thread(void *param)
{
char tname[MAXCOMLEN + 1];
struct mt_vmm_info *mtp;
int vcpu;
mtp = param;
vcpu = mtp->mt_vcpu;
snprintf(tname, sizeof(tname), "vcpu %d", vcpu);
pthread_set_name_np(mtp->mt_thr, tname);
#ifdef BHYVE_SNAPSHOT
checkpoint_cpu_add(vcpu);
#endif
gdb_cpu_add(vcpu);
vm_loop(mtp->mt_ctx, vcpu, vmexit[vcpu].rip);
/* not reached */
exit(1);
return (NULL);
}
void
fbsdrun_addcpu(struct vmctx *ctx, int fromcpu, int newcpu, uint64_t rip)
{
int error;
assert(fromcpu == BSP);
/*
* The 'newcpu' must be activated in the context of 'fromcpu'. If
* vm_activate_cpu() is delayed until newcpu's pthread starts running
* then vmm.ko is out-of-sync with bhyve and this can create a race
* with vm_suspend().
*/
error = vm_activate_cpu(ctx, newcpu);
if (error != 0)
err(EX_OSERR, "could not activate CPU %d", newcpu);
CPU_SET_ATOMIC(newcpu, &cpumask);
/*
* Set up the vmexit struct to allow execution to start
* at the given RIP
*/
vmexit[newcpu].rip = rip;
vmexit[newcpu].inst_length = 0;
mt_vmm_info[newcpu].mt_ctx = ctx;
mt_vmm_info[newcpu].mt_vcpu = newcpu;
error = pthread_create(&mt_vmm_info[newcpu].mt_thr, NULL,
fbsdrun_start_thread, &mt_vmm_info[newcpu]);
assert(error == 0);
}
static int
fbsdrun_deletecpu(struct vmctx *ctx, int vcpu)
{
if (!CPU_ISSET(vcpu, &cpumask)) {
fprintf(stderr, "Attempting to delete unknown cpu %d\n", vcpu);
exit(4);
}
CPU_CLR_ATOMIC(vcpu, &cpumask);
return (CPU_EMPTY(&cpumask));
}
static int
vmexit_handle_notify(struct vmctx *ctx, struct vm_exit *vme, int *pvcpu,
uint32_t eax)
{
#if BHYVE_DEBUG
/*
* put guest-driven debug here
*/
#endif
return (VMEXIT_CONTINUE);
}
static int
vmexit_inout(struct vmctx *ctx, struct vm_exit *vme, int *pvcpu)
{
int error;
int bytes, port, in, out;
int vcpu;
vcpu = *pvcpu;
port = vme->u.inout.port;
bytes = vme->u.inout.bytes;
in = vme->u.inout.in;
out = !in;
/* Extra-special case of host notifications */
if (out && port == GUEST_NIO_PORT) {
error = vmexit_handle_notify(ctx, vme, pvcpu, vme->u.inout.eax);
return (error);
}
error = emulate_inout(ctx, vcpu, vme);
if (error) {
fprintf(stderr, "Unhandled %s%c 0x%04x at 0x%lx\n",
in ? "in" : "out",
bytes == 1 ? 'b' : (bytes == 2 ? 'w' : 'l'),
port, vmexit->rip);
return (VMEXIT_ABORT);
} else {
return (VMEXIT_CONTINUE);
}
}
static int
vmexit_rdmsr(struct vmctx *ctx, struct vm_exit *vme, int *pvcpu)
{
uint64_t val;
uint32_t eax, edx;
int error;
val = 0;
error = emulate_rdmsr(ctx, *pvcpu, vme->u.msr.code, &val);
if (error != 0) {
fprintf(stderr, "rdmsr to register %#x on vcpu %d\n",
vme->u.msr.code, *pvcpu);
if (get_config_bool("x86.strictmsr")) {
vm_inject_gp(ctx, *pvcpu);
return (VMEXIT_CONTINUE);
}
}
eax = val;
error = vm_set_register(ctx, *pvcpu, VM_REG_GUEST_RAX, eax);
assert(error == 0);
edx = val >> 32;
error = vm_set_register(ctx, *pvcpu, VM_REG_GUEST_RDX, edx);
assert(error == 0);
return (VMEXIT_CONTINUE);
}
static int
vmexit_wrmsr(struct vmctx *ctx, struct vm_exit *vme, int *pvcpu)
{
int error;
error = emulate_wrmsr(ctx, *pvcpu, vme->u.msr.code, vme->u.msr.wval);
if (error != 0) {
fprintf(stderr, "wrmsr to register %#x(%#lx) on vcpu %d\n",
vme->u.msr.code, vme->u.msr.wval, *pvcpu);
if (get_config_bool("x86.strictmsr")) {
vm_inject_gp(ctx, *pvcpu);
return (VMEXIT_CONTINUE);
}
}
return (VMEXIT_CONTINUE);
}
static int
vmexit_spinup_ap(struct vmctx *ctx, struct vm_exit *vme, int *pvcpu)
{
(void)spinup_ap(ctx, *pvcpu,
vme->u.spinup_ap.vcpu, vme->u.spinup_ap.rip);
return (VMEXIT_CONTINUE);
}
#define DEBUG_EPT_MISCONFIG
#ifdef DEBUG_EPT_MISCONFIG
#define VMCS_GUEST_PHYSICAL_ADDRESS 0x00002400
static uint64_t ept_misconfig_gpa, ept_misconfig_pte[4];
static int ept_misconfig_ptenum;
#endif
static const char *
vmexit_vmx_desc(uint32_t exit_reason)
{
if (exit_reason >= nitems(vmx_exit_reason_desc) ||
vmx_exit_reason_desc[exit_reason] == NULL)
return ("Unknown");
return (vmx_exit_reason_desc[exit_reason]);
}
static int
vmexit_vmx(struct vmctx *ctx, struct vm_exit *vmexit, int *pvcpu)
{
fprintf(stderr, "vm exit[%d]\n", *pvcpu);
fprintf(stderr, "\treason\t\tVMX\n");
fprintf(stderr, "\trip\t\t0x%016lx\n", vmexit->rip);
fprintf(stderr, "\tinst_length\t%d\n", vmexit->inst_length);
fprintf(stderr, "\tstatus\t\t%d\n", vmexit->u.vmx.status);
fprintf(stderr, "\texit_reason\t%u (%s)\n", vmexit->u.vmx.exit_reason,
vmexit_vmx_desc(vmexit->u.vmx.exit_reason));
fprintf(stderr, "\tqualification\t0x%016lx\n",
vmexit->u.vmx.exit_qualification);
fprintf(stderr, "\tinst_type\t\t%d\n", vmexit->u.vmx.inst_type);
fprintf(stderr, "\tinst_error\t\t%d\n", vmexit->u.vmx.inst_error);
#ifdef DEBUG_EPT_MISCONFIG
if (vmexit->u.vmx.exit_reason == EXIT_REASON_EPT_MISCONFIG) {
vm_get_register(ctx, *pvcpu,
VMCS_IDENT(VMCS_GUEST_PHYSICAL_ADDRESS),
&ept_misconfig_gpa);
vm_get_gpa_pmap(ctx, ept_misconfig_gpa, ept_misconfig_pte,
&ept_misconfig_ptenum);
fprintf(stderr, "\tEPT misconfiguration:\n");
fprintf(stderr, "\t\tGPA: %#lx\n", ept_misconfig_gpa);
fprintf(stderr, "\t\tPTE(%d): %#lx %#lx %#lx %#lx\n",
ept_misconfig_ptenum, ept_misconfig_pte[0],
ept_misconfig_pte[1], ept_misconfig_pte[2],
ept_misconfig_pte[3]);
}
#endif /* DEBUG_EPT_MISCONFIG */
return (VMEXIT_ABORT);
}
static int
vmexit_svm(struct vmctx *ctx, struct vm_exit *vmexit, int *pvcpu)
{
fprintf(stderr, "vm exit[%d]\n", *pvcpu);
fprintf(stderr, "\treason\t\tSVM\n");
fprintf(stderr, "\trip\t\t0x%016lx\n", vmexit->rip);
fprintf(stderr, "\tinst_length\t%d\n", vmexit->inst_length);
fprintf(stderr, "\texitcode\t%#lx\n", vmexit->u.svm.exitcode);
fprintf(stderr, "\texitinfo1\t%#lx\n", vmexit->u.svm.exitinfo1);
fprintf(stderr, "\texitinfo2\t%#lx\n", vmexit->u.svm.exitinfo2);
return (VMEXIT_ABORT);
}
static int
vmexit_bogus(struct vmctx *ctx, struct vm_exit *vmexit, int *pvcpu)
{
assert(vmexit->inst_length == 0);
stats.vmexit_bogus++;
return (VMEXIT_CONTINUE);
}
static int
vmexit_reqidle(struct vmctx *ctx, struct vm_exit *vmexit, int *pvcpu)
{
assert(vmexit->inst_length == 0);
stats.vmexit_reqidle++;
return (VMEXIT_CONTINUE);
}
static int
vmexit_hlt(struct vmctx *ctx, struct vm_exit *vmexit, int *pvcpu)
{
stats.vmexit_hlt++;
/*
* Just continue execution with the next instruction. We use
* the HLT VM exit as a way to be friendly with the host
* scheduler.
*/
return (VMEXIT_CONTINUE);
}
static int
vmexit_pause(struct vmctx *ctx, struct vm_exit *vmexit, int *pvcpu)
{
stats.vmexit_pause++;
return (VMEXIT_CONTINUE);
}
static int
vmexit_mtrap(struct vmctx *ctx, struct vm_exit *vmexit, int *pvcpu)
{
assert(vmexit->inst_length == 0);
stats.vmexit_mtrap++;
#ifdef BHYVE_SNAPSHOT
checkpoint_cpu_suspend(*pvcpu);
#endif
gdb_cpu_mtrap(*pvcpu);
#ifdef BHYVE_SNAPSHOT
checkpoint_cpu_resume(*pvcpu);
#endif
return (VMEXIT_CONTINUE);
}
static int
vmexit_inst_emul(struct vmctx *ctx, struct vm_exit *vmexit, int *pvcpu)
{
int err, i, cs_d;
struct vie *vie;
enum vm_cpu_mode mode;
stats.vmexit_inst_emul++;
vie = &vmexit->u.inst_emul.vie;
if (!vie->decoded) {
/*
* Attempt to decode in userspace as a fallback. This allows
* updating instruction decode in bhyve without rebooting the
* kernel (rapid prototyping), albeit with much slower
* emulation.
*/
vie_restart(vie);
mode = vmexit->u.inst_emul.paging.cpu_mode;
cs_d = vmexit->u.inst_emul.cs_d;
if (vmm_decode_instruction(mode, cs_d, vie) != 0)
goto fail;
if (vm_set_register(ctx, *pvcpu, VM_REG_GUEST_RIP,
vmexit->rip + vie->num_processed) != 0)
goto fail;
}
err = emulate_mem(ctx, *pvcpu, vmexit->u.inst_emul.gpa,
vie, &vmexit->u.inst_emul.paging);
if (err) {
if (err == ESRCH) {
EPRINTLN("Unhandled memory access to 0x%lx\n",
vmexit->u.inst_emul.gpa);
}
goto fail;
}
return (VMEXIT_CONTINUE);
fail:
fprintf(stderr, "Failed to emulate instruction sequence [ ");
for (i = 0; i < vie->num_valid; i++)
fprintf(stderr, "%02x", vie->inst[i]);
FPRINTLN(stderr, " ] at 0x%lx", vmexit->rip);
return (VMEXIT_ABORT);
}
static pthread_mutex_t resetcpu_mtx = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t resetcpu_cond = PTHREAD_COND_INITIALIZER;
static int
vmexit_suspend(struct vmctx *ctx, struct vm_exit *vmexit, int *pvcpu)
{
enum vm_suspend_how how;
how = vmexit->u.suspended.how;
fbsdrun_deletecpu(ctx, *pvcpu);
if (*pvcpu != BSP) {
pthread_mutex_lock(&resetcpu_mtx);
pthread_cond_signal(&resetcpu_cond);
pthread_mutex_unlock(&resetcpu_mtx);
pthread_exit(NULL);
}
pthread_mutex_lock(&resetcpu_mtx);
while (!CPU_EMPTY(&cpumask)) {
pthread_cond_wait(&resetcpu_cond, &resetcpu_mtx);
}
pthread_mutex_unlock(&resetcpu_mtx);
switch (how) {
case VM_SUSPEND_RESET:
exit(0);
case VM_SUSPEND_POWEROFF:
if (get_config_bool_default("destroy_on_poweroff", false))
vm_destroy(ctx, NULL);
exit(1);
case VM_SUSPEND_HALT:
exit(2);
case VM_SUSPEND_TRIPLEFAULT:
exit(3);
default:
fprintf(stderr, "vmexit_suspend: invalid reason %d\n", how);
exit(100);
}
return (0); /* NOTREACHED */
}
static int
vmexit_debug(struct vmctx *ctx, struct vm_exit *vmexit, int *pvcpu)
{
#ifdef BHYVE_SNAPSHOT
checkpoint_cpu_suspend(*pvcpu);
#endif
gdb_cpu_suspend(*pvcpu);
#ifdef BHYVE_SNAPSHOT
checkpoint_cpu_resume(*pvcpu);
#endif
return (VMEXIT_CONTINUE);
}
static int
vmexit_breakpoint(struct vmctx *ctx, struct vm_exit *vmexit, int *pvcpu)
{
gdb_cpu_breakpoint(*pvcpu, vmexit);
return (VMEXIT_CONTINUE);
}
static vmexit_handler_t handler[VM_EXITCODE_MAX] = {
[VM_EXITCODE_INOUT] = vmexit_inout,
[VM_EXITCODE_INOUT_STR] = vmexit_inout,
[VM_EXITCODE_VMX] = vmexit_vmx,
[VM_EXITCODE_SVM] = vmexit_svm,
[VM_EXITCODE_BOGUS] = vmexit_bogus,
[VM_EXITCODE_REQIDLE] = vmexit_reqidle,
[VM_EXITCODE_RDMSR] = vmexit_rdmsr,
[VM_EXITCODE_WRMSR] = vmexit_wrmsr,
[VM_EXITCODE_MTRAP] = vmexit_mtrap,
[VM_EXITCODE_INST_EMUL] = vmexit_inst_emul,
[VM_EXITCODE_SPINUP_AP] = vmexit_spinup_ap,
[VM_EXITCODE_SUSPENDED] = vmexit_suspend,
[VM_EXITCODE_TASK_SWITCH] = vmexit_task_switch,
[VM_EXITCODE_DEBUG] = vmexit_debug,
[VM_EXITCODE_BPT] = vmexit_breakpoint,
};
static void
vm_loop(struct vmctx *ctx, int vcpu, uint64_t startrip)
{
int error, rc;
enum vm_exitcode exitcode;
cpuset_t active_cpus;
if (vcpumap[vcpu] != NULL) {
error = pthread_setaffinity_np(pthread_self(),
sizeof(cpuset_t), vcpumap[vcpu]);
assert(error == 0);
}
error = vm_active_cpus(ctx, &active_cpus);
assert(CPU_ISSET(vcpu, &active_cpus));
error = vm_set_register(ctx, vcpu, VM_REG_GUEST_RIP, startrip);
assert(error == 0);
while (1) {
error = vm_run(ctx, vcpu, &vmexit[vcpu]);
if (error != 0)
break;
exitcode = vmexit[vcpu].exitcode;
if (exitcode >= VM_EXITCODE_MAX || handler[exitcode] == NULL) {
fprintf(stderr, "vm_loop: unexpected exitcode 0x%x\n",
exitcode);
exit(4);
}
rc = (*handler[exitcode])(ctx, &vmexit[vcpu], &vcpu);
switch (rc) {
case VMEXIT_CONTINUE:
break;
case VMEXIT_ABORT:
abort();
default:
exit(4);
}
}
fprintf(stderr, "vm_run error %d, errno %d\n", error, errno);
}