libvirt/tools/virt-host-validate-common.c

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/*
* virt-host-validate-common.c: Sanity check helper APIs
*
* Copyright (C) 2012, 2014 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#include <config.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/utsname.h>
#ifdef HAVE_MNTENT_H
# include <mntent.h>
#endif /* HAVE_MNTENT_H */
#include <sys/stat.h>
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#include "virutil.h"
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#include "viralloc.h"
#include "virfile.h"
#include "virt-host-validate-common.h"
#include "virstring.h"
#define VIR_FROM_THIS VIR_FROM_NONE
static bool quiet;
void virHostMsgSetQuiet(bool quietFlag)
{
quiet = quietFlag;
}
void virHostMsgCheck(const char *prefix,
const char *format,
...)
{
va_list args;
char *msg;
if (quiet)
return;
va_start(args, format);
if (virVasprintf(&msg, format, args) < 0) {
perror("malloc");
abort();
}
va_end(args);
fprintf(stdout, _("%6s: Checking %-60s: "), prefix, msg);
VIR_FREE(msg);
}
static bool virHostMsgWantEscape(void)
{
static bool detectTty = true;
static bool wantEscape;
if (detectTty) {
if (isatty(STDOUT_FILENO))
wantEscape = true;
detectTty = false;
}
return wantEscape;
}
void virHostMsgPass(void)
{
if (quiet)
return;
if (virHostMsgWantEscape())
fprintf(stdout, "\033[32m%s\033[0m\n", _("PASS"));
else
fprintf(stdout, "%s\n", _("PASS"));
}
static const char * failMessages[] = {
N_("FAIL"),
N_("WARN"),
N_("NOTE"),
};
verify(ARRAY_CARDINALITY(failMessages) == VIR_HOST_VALIDATE_LAST);
static const char *failEscapeCodes[] = {
"\033[31m",
"\033[33m",
"\033[34m",
};
verify(ARRAY_CARDINALITY(failEscapeCodes) == VIR_HOST_VALIDATE_LAST);
void virHostMsgFail(virHostValidateLevel level,
const char *format,
...)
{
va_list args;
char *msg;
if (quiet)
return;
va_start(args, format);
if (virVasprintf(&msg, format, args) < 0) {
perror("malloc");
abort();
}
va_end(args);
if (virHostMsgWantEscape())
fprintf(stdout, "%s%s\033[0m (%s)\n",
failEscapeCodes[level], _(failMessages[level]), msg);
else
fprintf(stdout, "%s (%s)\n",
_(failMessages[level]), msg);
VIR_FREE(msg);
}
int virHostValidateDeviceExists(const char *hvname,
const char *dev_name,
virHostValidateLevel level,
const char *hint)
{
virHostMsgCheck(hvname, "if device %s exists", dev_name);
if (access(dev_name, F_OK) < 0) {
virHostMsgFail(level, "%s", hint);
return -1;
}
virHostMsgPass();
return 0;
}
int virHostValidateDeviceAccessible(const char *hvname,
const char *dev_name,
virHostValidateLevel level,
const char *hint)
{
virHostMsgCheck(hvname, "if device %s is accessible", dev_name);
if (access(dev_name, R_OK|W_OK) < 0) {
virHostMsgFail(level, "%s", hint);
return -1;
}
virHostMsgPass();
return 0;
}
int virHostValidateNamespace(const char *hvname,
const char *ns_name,
virHostValidateLevel level,
const char *hint)
{
virHostMsgCheck(hvname, "for namespace %s", ns_name);
char nspath[100];
snprintf(nspath, sizeof(nspath), "/proc/self/ns/%s", ns_name);
if (access(nspath, F_OK) < 0) {
virHostMsgFail(level, "%s", hint);
return -1;
}
virHostMsgPass();
return 0;
}
bool virHostValidateHasCPUFlag(const char *name)
{
FILE *fp = fopen("/proc/cpuinfo", "r");
bool ret = false;
if (!fp)
return false;
do {
char line[1024];
if (!fgets(line, sizeof(line), fp))
break;
if (strstr(line, name)) {
ret = true;
break;
}
} while (1);
VIR_FORCE_FCLOSE(fp);
return ret;
}
int virHostValidateLinuxKernel(const char *hvname,
int version,
virHostValidateLevel level,
const char *hint)
{
struct utsname uts;
unsigned long thisversion;
uname(&uts);
virHostMsgCheck(hvname, _("for Linux >= %d.%d.%d"),
((version >> 16) & 0xff),
((version >> 8) & 0xff),
(version & 0xff));
if (STRNEQ(uts.sysname, "Linux")) {
virHostMsgFail(level, "%s", hint);
return -1;
}
if (virParseVersionString(uts.release, &thisversion, true) < 0) {
virHostMsgFail(level, "%s", hint);
return -1;
}
if (thisversion < version) {
virHostMsgFail(level, "%s", hint);
return -1;
} else {
virHostMsgPass();
return 0;
}
}
static int virHostValidateCGroupSupport(const char *hvname,
const char *cg_name,
virHostValidateLevel level,
const char *config_name)
{
virHostMsgCheck(hvname, "for cgroup '%s' controller support", cg_name);
FILE *fp = fopen("/proc/self/cgroup", "r");
size_t len = 0;
char *line = NULL;
ssize_t ret;
bool matched = false;
if (!fp)
goto error;
while ((ret = getline(&line, &len, fp)) >= 0 && !matched) {
char *tmp = strstr(line, cg_name);
if (!tmp)
continue;
tmp += strlen(cg_name);
if (*tmp != ',' &&
*tmp != ':')
continue;
matched = true;
}
VIR_FREE(line);
VIR_FORCE_FCLOSE(fp);
if (!matched)
goto error;
virHostMsgPass();
return 0;
error:
VIR_FREE(line);
virHostMsgFail(level, "Enable CONFIG_%s in kernel Kconfig file", config_name);
return -1;
}
#ifdef HAVE_MNTENT_H
static int virHostValidateCGroupMount(const char *hvname,
const char *cg_name,
virHostValidateLevel level)
{
virHostMsgCheck(hvname, "for cgroup '%s' controller mount-point", cg_name);
FILE *fp = setmntent("/proc/mounts", "r");
struct mntent ent;
char mntbuf[1024];
bool matched = false;
if (!fp)
goto error;
while (getmntent_r(fp, &ent, mntbuf, sizeof(mntbuf)) && !matched) {
char *tmp = strstr(ent.mnt_opts, cg_name);
if (!tmp)
continue;
tmp += strlen(cg_name);
if (*tmp != ',' &&
*tmp != '\0')
continue;
matched = true;
}
endmntent(fp);
if (!matched)
goto error;
virHostMsgPass();
return 0;
error:
virHostMsgFail(level, "Mount '%s' cgroup controller (suggested at /sys/fs/cgroup/%s)",
cg_name, cg_name);
return -1;
}
#else /* ! HAVE_MNTENT_H */
static int virHostValidateCGroupMount(const char *hvname,
const char *cg_name,
virHostValidateLevel level)
{
virHostMsgCheck(hvname, "for cgroup '%s' controller mount-point", cg_name);
virHostMsgFail(level, "%s", "This platform does not support cgroups");
return -1;
}
#endif /* ! HAVE_MNTENT_H */
int virHostValidateCGroupController(const char *hvname,
const char *cg_name,
virHostValidateLevel level,
const char *config_name)
{
if (virHostValidateCGroupSupport(hvname,
cg_name,
level,
config_name) < 0)
return -1;
if (virHostValidateCGroupMount(hvname,
cg_name,
level) < 0)
return -1;
return 0;
}
int virHostValidateIOMMU(const char *hvname,
virHostValidateLevel level)
{
struct stat sb;
const char *bootarg = NULL;
bool isAMD = false, isIntel = false;
if (virHostValidateHasCPUFlag("vmx"))
isIntel = true;
else if (virHostValidateHasCPUFlag("svm"))
isAMD = true;
virHostMsgCheck(hvname, "%s", _("for device assignment IOMMU support"));
if (isIntel) {
if (access("/sys/firmware/acpi/tables/DMAR", F_OK) == 0) {
virHostMsgPass();
bootarg = "intel_iommu=on";
} else {
virHostMsgFail(level,
"No ACPI DMAR table found, IOMMU either "
"disabled in BIOS or not supported by this "
"hardware platform");
return -1;
}
} else if (isAMD) {
if (access("/sys/firmware/acpi/tables/IVRS", F_OK) == 0) {
virHostMsgPass();
bootarg = "iommu=pt iommu=1";
} else {
virHostMsgFail(level,
"No ACPI IVRS table found, IOMMU either "
"disabled in BIOS or not supported by this "
"hardware platform");
return -1;
}
} else {
virHostMsgFail(level,
"Unknown if this platform has IOMMU support");
return -1;
}
/* We can only check on newer kernels with iommu groups & vfio */
if (stat("/sys/kernel/iommu_groups", &sb) < 0)
return 0;
if (!S_ISDIR(sb.st_mode))
return 0;
virHostMsgCheck(hvname, "%s", _("if IOMMU is enabled by kernel"));
if (sb.st_nlink <= 2) {
virHostMsgFail(level,
"IOMMU appears to be disabled in kernel. "
"Add %s to kernel cmdline arguments", bootarg);
return -1;
}
virHostMsgPass();
return 0;
}