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libvirt/tools/virt-host-validate-common.c
Thomas Huth d38d512f4e tools/virt-host-validate: Fix IOMMU check on s390x 
When running virt-host-validate on an s390x host, the tool currently warns
that it is "Unknown if this platform has IOMMU support". We can use the
common check for entries in /sys/kernel/iommu_groups here, too, but it only
makes sense to check it if there are also PCI devices available. It's also
common on s390x that there are no PCI devices assigned to the LPAR, and in
that case there is no need for the PCI-related IOMMU, so without PCI devices
we should simply skip this test.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Bjoern Walk <bwalk@linux.ibm.com>
Reviewed-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
2019-03-08 09:16:00 +01:00

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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 <unistd.h>
#include <sys/utsname.h>
#include <sys/stat.h>
#include "viralloc.h"
#include "vircgroup.h"
#include "virfile.h"
#include "virt-host-validate-common.h"
#include "virstring.h"
#include "virarch.h"
#define VIR_FROM_THIS VIR_FROM_NONE
VIR_ENUM_IMPL(virHostValidateCPUFlag, VIR_HOST_VALIDATE_CPU_FLAG_LAST,
"vmx",
"svm",
"sie");
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;
}
virBitmapPtr virHostValidateGetCPUFlags(void)
{
FILE *fp;
virBitmapPtr flags = NULL;
if (!(fp = fopen("/proc/cpuinfo", "r")))
return NULL;
if (!(flags = virBitmapNewQuiet(VIR_HOST_VALIDATE_CPU_FLAG_LAST)))
goto cleanup;
do {
char line[1024];
char *start;
char **tokens;
size_t ntokens;
size_t i;
if (!fgets(line, sizeof(line), fp))
break;
/* The line we're interested in is marked differently depending
* on the architecture, so check possible prefixes */
if (!STRPREFIX(line, "flags") &&
!STRPREFIX(line, "Features") &&
!STRPREFIX(line, "features"))
continue;
/* fgets() includes the trailing newline in the output buffer,
* so we need to clean that up ourselves. We can safely access
* line[strlen(line) - 1] because the checks above would cause
* us to skip empty strings */
line[strlen(line) - 1] = '\0';
/* Skip to the separator */
if (!(start = strchr(line, ':')))
continue;
/* Split the line using " " as a delimiter. The first token
* will always be ":", but that's okay */
if (!(tokens = virStringSplitCount(start, " ", 0, &ntokens)))
continue;
/* Go through all flags and check whether one of those we
* might want to check for later on is present; if that's
* the case, set the relevant bit in the bitmap */
for (i = 0; i < ntokens; i++) {
int value;
if ((value = virHostValidateCPUFlagTypeFromString(tokens[i])) >= 0)
ignore_value(virBitmapSetBit(flags, value));
}
virStringListFreeCount(tokens, ntokens);
} while (1);
cleanup:
VIR_FORCE_FCLOSE(fp);
return flags;
}
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;
}
}
#ifdef __linux__
int virHostValidateCGroupControllers(const char *hvname,
int controllers,
virHostValidateLevel level)
{
virCgroupPtr group = NULL;
int ret = 0;
size_t i;
if (virCgroupNewSelf(&group) < 0)
return -1;
for (i = 0; i < VIR_CGROUP_CONTROLLER_LAST; i++) {
int flag = 1 << i;
const char *cg_name = virCgroupControllerTypeToString(i);
if (!(controllers & flag))
continue;
virHostMsgCheck(hvname, "for cgroup '%s' controller support", cg_name);
if (!virCgroupHasController(group, i)) {
ret = -1;
virHostMsgFail(level, "Enable '%s' in kernel Kconfig file or "
"mount/enable cgroup controller in your system",
cg_name);
} else {
virHostMsgPass();
}
}
virCgroupFree(&group);
return ret;
}
#else /* !__linux__ */
int virHostValidateCGroupControllers(const char *hvname ATTRIBUTE_UNUSED,
int controllers ATTRIBUTE_UNUSED,
virHostValidateLevel level)
{
virHostMsgFail(level, "%s", "This platform does not support cgroups");
return -1;
}
#endif /* !__linux__ */
int virHostValidateIOMMU(const char *hvname,
virHostValidateLevel level)
{
virBitmapPtr flags;
struct stat sb;
const char *bootarg = NULL;
bool isAMD = false, isIntel = false;
virArch arch = virArchFromHost();
struct dirent *dent;
DIR *dir;
int rc;
flags = virHostValidateGetCPUFlags();
if (flags && virBitmapIsBitSet(flags, VIR_HOST_VALIDATE_CPU_FLAG_VMX))
isIntel = true;
else if (flags && virBitmapIsBitSet(flags, VIR_HOST_VALIDATE_CPU_FLAG_SVM))
isAMD = true;
virBitmapFree(flags);
if (isIntel) {
virHostMsgCheck(hvname, "%s", _("for device assignment IOMMU support"));
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) {
virHostMsgCheck(hvname, "%s", _("for device assignment IOMMU support"));
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 if (ARCH_IS_PPC64(arch)) {
/* Empty Block */
} else if (ARCH_IS_S390(arch)) {
/* On s390x, we skip the IOMMU check if there are no PCI
* devices (which is quite usual on s390x). If there are
* no PCI devices the directory is still there but is
* empty. */
if (!virDirOpen(&dir, "/sys/bus/pci/devices"))
return 0;
rc = virDirRead(dir, &dent, NULL);
VIR_DIR_CLOSE(dir);
if (rc <= 0)
return 0;
} 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) {
if (bootarg)
virHostMsgFail(level,
"IOMMU appears to be disabled in kernel. "
"Add %s to kernel cmdline arguments", bootarg);
else
virHostMsgFail(level, "IOMMU capability not compiled into kernel.");
return -1;
}
virHostMsgPass();
return 0;
}
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