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libvirt/src/libxl/libxl_capabilities.c
Joao Martins 17322e5518 libxl: describe host cpu features based on hwcaps 
Parse libxl_hwcap accounting for versions since Xen 4.4 - Xen 4.7.
libxl_hwcaps is a set of cpuid leaves output that is described in [0] or
[1] in Xen 4.7. This is a collection of CPUID leaves that we version
in libvirt whenever feature words are reordered or added. Thus we keep the
common ones in one struct and others for each version. Since
libxl_hwcaps doesn't appear to have a stable format across all supported
versions thus we need to keep track of changes as a compromise until it's
exported in xen libxl API. We don't fail in initializing the driver in case
parsing of hwcaps failed for that reason. In addition, change the notation
on PAE feature such that is easier to read which bit it corresponds.

[0] xen/include/asm-x86/cpufeature.h
[1] xen/include/public/arch-x86/cpufeatureset.h

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
2016-09-12 12:49:03 +02:00

752 lines
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/*
* libxl_capabilities.c: libxl capabilities generation
*
* Copyright (C) 2016 SUSE LINUX Products GmbH, Nuernberg, Germany.
*
* 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/>.
*
* Author: Jim Fehlig <jfehlig@suse.com>
*/
#include <config.h>
#include <libxl.h>
#include <regex.h>
#include "internal.h"
#include "virlog.h"
#include "virerror.h"
#include "virfile.h"
#include "viralloc.h"
#include "virstring.h"
#include "domain_conf.h"
#include "capabilities.h"
#include "domain_capabilities.h"
#include "vircommand.h"
#include "libxl_capabilities.h"
#include "cpu/cpu_x86.h"
#include "cpu/cpu_x86_data.h"
#define VIR_FROM_THIS VIR_FROM_LIBXL
VIR_LOG_INIT("libxl.libxl_capabilities");
/* see xen-unstable.hg/xen/include/asm-x86/cpufeature.h */
#define LIBXL_X86_FEATURE_PAE_MASK (1 << 6)
#define LIBXL_X86_FEATURE_LM_MASK (1 << 29)
enum libxlHwcapVersion {
LIBXL_HWCAP_V0 = 0, /* for Xen 4.4 .. 4.6 */
LIBXL_HWCAP_V1, /* for Xen 4.7 and up */
};
struct guest_arch {
virArch arch;
int bits;
int hvm;
int pae;
int nonpae;
int ia64_be;
};
#define XEN_CAP_REGEX "(xen|hvm)-[[:digit:]]+\\.[[:digit:]]+-(aarch64|armv7l|x86_32|x86_64|ia64|powerpc64)(p|be)?"
static int
libxlCapsAddCPUID(virCPUx86Data *data, virCPUx86CPUID *cpuid, ssize_t ncaps)
{
size_t i;
for (i = 0; i < ncaps; i++) {
virCPUx86CPUID *c = &cpuid[i];
if (virCPUx86DataAddCPUID(data, c) < 0) {
VIR_DEBUG("Failed to add CPUID(%x,%x)", c->eax_in, c->ecx_in);
return -1;
}
}
return 0;
}
/*
* The words represented in physinfo.hw_cap are host CPUID (sub) leafs.
* Position of these hasn't changed much up until Xen 4.7 with a rework
* on how CPUID is handled internally. As a side-effect it got normalized
* and also added more feature words. Although cannot be relied upon as
* stable interface, and hence we version changes in position of the features
* across all supported versions of the libxl driver until libxl exposes a
* stable representation of these capabilities. Fortunately not a lot of
* variation happened so it's still trivial to keep track of these leafs
* to describe host CPU in libvirt capabilities. v0 stands for Xen 4.4
* up to 4.6, while v1 is meant for Xen 4.7, as depicted in the table below:
*
* | v0 (Xen 4.4 - 4.6) | v1 (Xen >= 4.7) |
* ---------------------------------------------
* word 0 | CPUID.00000001.EDX | CPUID.00000001.EDX |
* word 1 | CPUID.80000001.EDX | CPUID.00000001.ECX |
* word 2 | CPUID.80860001 | CPUID.80000001.EDX |
* word 3 | - Linux - | CPUID.80000001.ECX |
* word 4 | CPUID.00000001.ECX | CPUID.0000000D:1.EAX |
* word 5 | CPUID.C0000001 | CPUID.00000007:0.EBX |
* word 6 | CPUID.80000001.ECX | CPUID.00000007:0.ECX |
* word 7 | CPUID.00000007.EBX | CPUID.80000007.EDX |
* word 8 | - Non existent - | CPUID.80000008.EBX |
*
*/
static virCPUDataPtr
libxlCapsNodeData(virCPUDefPtr cpu, libxl_hwcap hwcap,
enum libxlHwcapVersion version)
{
ssize_t ncaps;
virCPUDataPtr cpudata = NULL;
virCPUx86Data data = VIR_CPU_X86_DATA_INIT;
virCPUx86CPUID cpuid[] = {
{ .eax_in = 0x00000001,
.edx = hwcap[0] },
{ .eax_in = 0x00000001,
.ecx = (version > LIBXL_HWCAP_V0 ? hwcap[1] : hwcap[4]) },
{ .eax_in = 0x80000001,
.edx = (version > LIBXL_HWCAP_V0 ? hwcap[2] : hwcap[1]) },
{ .eax_in = 0x80000001,
.ecx = (version > LIBXL_HWCAP_V0 ? hwcap[3] : hwcap[6]) },
{ .eax_in = 0x00000007,
.ebx = (version > LIBXL_HWCAP_V0 ? hwcap[5] : hwcap[7]) },
};
virCPUx86CPUID cpuid_ver1[] = {
{ .eax_in = 0x0000000D, .ecx_in = 1U, .eax = hwcap[4] },
{ .eax_in = 0x00000007, .ecx_in = 0U, .ecx = hwcap[6] },
{ .eax_in = 0x80000007, .ecx_in = 0U, .edx = hwcap[7] },
};
ncaps = ARRAY_CARDINALITY(cpuid);
if (libxlCapsAddCPUID(&data, cpuid, ncaps) < 0)
goto error;
ncaps = ARRAY_CARDINALITY(cpuid_ver1);
if (version > LIBXL_HWCAP_V0 &&
libxlCapsAddCPUID(&data, cpuid_ver1, ncaps) < 0)
goto error;
cpudata = virCPUx86MakeData(cpu->arch, &data);
error:
virCPUx86DataClear(&data);
return cpudata;
}
/* hw_caps is an array of 32-bit words whose meaning is listed in
* xen-unstable.hg/xen/include/asm-x86/cpufeature.h. Each feature
* is defined in the form X*32+Y, corresponding to the Y'th bit in
* the X'th 32-bit word of hw_cap.
*/
static int
libxlCapsInitCPU(virCapsPtr caps, libxl_physinfo *phy_info,
enum libxlHwcapVersion version)
{
virCPUDataPtr data = NULL;
virCPUDefPtr cpu = NULL;
int ret = -1;
int host_pae;
int host_lm;
/* On ARM hw_cap vector is zeroed out but not on x86 */
if (!phy_info->hw_cap[0])
return 0;
if (VIR_ALLOC(cpu) < 0)
goto error;
host_pae = phy_info->hw_cap[0] & LIBXL_X86_FEATURE_PAE_MASK;
if (host_pae &&
virCapabilitiesAddHostFeature(caps, "pae") < 0)
goto error;
host_lm = (phy_info->hw_cap[version > LIBXL_HWCAP_V0 ? 2 : 1]
& LIBXL_X86_FEATURE_LM_MASK);
if (host_lm)
cpu->arch = VIR_ARCH_X86_64;
else
cpu->arch = VIR_ARCH_I686;
cpu->type = VIR_CPU_TYPE_HOST;
cpu->cores = phy_info->cores_per_socket;
cpu->threads = phy_info->threads_per_core;
cpu->sockets = phy_info->nr_cpus / (cpu->cores * cpu->threads);
caps->host.cpu = cpu;
ret = 0;
if (!(data = libxlCapsNodeData(cpu, phy_info->hw_cap, version)) ||
cpuDecode(cpu, data, NULL, 0, NULL) < 0) {
VIR_WARN("Failed to initialize host cpu features");
goto error;
}
cleanup:
cpuDataFree(data);
return ret;
error:
virCPUDefFree(cpu);
goto cleanup;
}
static int
libxlCapsInitHost(libxl_ctx *ctx, virCapsPtr caps)
{
const libxl_version_info *ver_info;
enum libxlHwcapVersion version;
libxl_physinfo phy_info;
if (libxl_get_physinfo(ctx, &phy_info) != 0) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Failed to get node physical info from libxenlight"));
return -1;
}
if ((ver_info = libxl_get_version_info(ctx)) == NULL) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Failed to get version info from libxenlight"));
return -1;
}
version = (ver_info->xen_version_minor >= 7);
if (libxlCapsInitCPU(caps, &phy_info, version) < 0)
return -1;
if (virCapabilitiesSetNetPrefix(caps, LIBXL_GENERATED_PREFIX_XEN) < 0)
return -1;
return 0;
}
static int
libxlCapsInitNuma(libxl_ctx *ctx, virCapsPtr caps)
{
libxl_numainfo *numa_info = NULL;
libxl_cputopology *cpu_topo = NULL;
int nr_nodes = 0, nr_cpus = 0;
virCapsHostNUMACellCPUPtr *cpus = NULL;
int *nr_cpus_node = NULL;
size_t i;
int ret = -1;
/* Let's try to fetch all the topology information */
numa_info = libxl_get_numainfo(ctx, &nr_nodes);
if (numa_info == NULL || nr_nodes == 0) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("libxl_get_numainfo failed"));
goto cleanup;
} else {
cpu_topo = libxl_get_cpu_topology(ctx, &nr_cpus);
if (cpu_topo == NULL || nr_cpus == 0) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("libxl_get_cpu_topology failed"));
goto cleanup;
}
}
if (VIR_ALLOC_N(cpus, nr_nodes) < 0)
goto cleanup;
if (VIR_ALLOC_N(nr_cpus_node, nr_nodes) < 0)
goto cleanup;
/* For each node, prepare a list of CPUs belonging to that node */
for (i = 0; i < nr_cpus; i++) {
int node = cpu_topo[i].node;
if (cpu_topo[i].core == LIBXL_CPUTOPOLOGY_INVALID_ENTRY)
continue;
nr_cpus_node[node]++;
if (nr_cpus_node[node] == 1) {
if (VIR_ALLOC(cpus[node]) < 0)
goto cleanup;
} else {
if (VIR_REALLOC_N(cpus[node], nr_cpus_node[node]) < 0)
goto cleanup;
}
/* Mapping between what libxl tells and what libvirt wants */
cpus[node][nr_cpus_node[node]-1].id = i;
cpus[node][nr_cpus_node[node]-1].socket_id = cpu_topo[i].socket;
cpus[node][nr_cpus_node[node]-1].core_id = cpu_topo[i].core;
/* Allocate the siblings maps. We will be filling them later */
cpus[node][nr_cpus_node[node]-1].siblings = virBitmapNew(nr_cpus);
if (!cpus[node][nr_cpus_node[node]-1].siblings) {
virReportOOMError();
goto cleanup;
}
}
/* Let's now populate the siblings bitmaps */
for (i = 0; i < nr_cpus; i++) {
int node = cpu_topo[i].node;
size_t j;
if (cpu_topo[i].core == LIBXL_CPUTOPOLOGY_INVALID_ENTRY)
continue;
for (j = 0; j < nr_cpus_node[node]; j++) {
if (cpus[node][j].socket_id == cpu_topo[i].socket &&
cpus[node][j].core_id == cpu_topo[i].core)
ignore_value(virBitmapSetBit(cpus[node][j].siblings, i));
}
}
for (i = 0; i < nr_nodes; i++) {
if (numa_info[i].size == LIBXL_NUMAINFO_INVALID_ENTRY)
continue;
if (virCapabilitiesAddHostNUMACell(caps, i,
numa_info[i].size / 1024,
nr_cpus_node[i], cpus[i],
0, NULL,
0, NULL) < 0) {
virCapabilitiesClearHostNUMACellCPUTopology(cpus[i],
nr_cpus_node[i]);
goto cleanup;
}
/* This is safe, as the CPU list is now stored in the NUMA cell */
cpus[i] = NULL;
}
ret = 0;
cleanup:
if (ret != 0) {
for (i = 0; cpus && i < nr_nodes; i++)
VIR_FREE(cpus[i]);
virCapabilitiesFreeNUMAInfo(caps);
}
VIR_FREE(cpus);
VIR_FREE(nr_cpus_node);
libxl_cputopology_list_free(cpu_topo, nr_cpus);
libxl_numainfo_list_free(numa_info, nr_nodes);
return ret;
}
static int
libxlCapsInitGuests(libxl_ctx *ctx, virCapsPtr caps)
{
const libxl_version_info *ver_info;
int err;
regex_t regex;
char *str, *token;
regmatch_t subs[4];
char *saveptr = NULL;
size_t i;
struct guest_arch guest_archs[32];
int nr_guest_archs = 0;
memset(guest_archs, 0, sizeof(guest_archs));
if ((ver_info = libxl_get_version_info(ctx)) == NULL) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Failed to get version info from libxenlight"));
return -1;
}
if (!ver_info->capabilities) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Failed to get capabilities from libxenlight"));
return -1;
}
err = regcomp(&regex, XEN_CAP_REGEX, REG_EXTENDED);
if (err != 0) {
char error[100];
regerror(err, &regex, error, sizeof(error));
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Failed to compile regex %s"), error);
return -1;
}
/* Format of capabilities string is documented in the code in
* xen-unstable.hg/xen/arch/.../setup.c.
*
* It is a space-separated list of supported guest architectures.
*
* For x86:
* TYP-VER-ARCH[p]
* ^ ^ ^ ^
* | | | +-- PAE supported
* | | +------- x86_32 or x86_64
* | +----------- the version of Xen, eg. "3.0"
* +--------------- "xen" or "hvm" for para or full virt respectively
*
* For IA64:
* TYP-VER-ARCH[be]
* ^ ^ ^ ^
* | | | +-- Big-endian supported
* | | +------- always "ia64"
* | +----------- the version of Xen, eg. "3.0"
* +--------------- "xen" or "hvm" for para or full virt respectively
*/
/* Split capabilities string into tokens. strtok_r is OK here because
* we "own" the buffer. Parse out the features from each token.
*/
for (str = ver_info->capabilities, nr_guest_archs = 0;
nr_guest_archs < sizeof(guest_archs) / sizeof(guest_archs[0])
&& (token = strtok_r(str, " ", &saveptr)) != NULL;
str = NULL) {
if (regexec(&regex, token, sizeof(subs) / sizeof(subs[0]),
subs, 0) == 0) {
int hvm = STRPREFIX(&token[subs[1].rm_so], "hvm");
virArch arch;
int pae = 0, nonpae = 0, ia64_be = 0;
if (STRPREFIX(&token[subs[2].rm_so], "x86_32")) {
arch = VIR_ARCH_I686;
if (subs[3].rm_so != -1 &&
STRPREFIX(&token[subs[3].rm_so], "p"))
pae = 1;
else
nonpae = 1;
} else if (STRPREFIX(&token[subs[2].rm_so], "x86_64")) {
arch = VIR_ARCH_X86_64;
} else if (STRPREFIX(&token[subs[2].rm_so], "ia64")) {
arch = VIR_ARCH_ITANIUM;
if (subs[3].rm_so != -1 &&
STRPREFIX(&token[subs[3].rm_so], "be"))
ia64_be = 1;
} else if (STRPREFIX(&token[subs[2].rm_so], "powerpc64")) {
arch = VIR_ARCH_PPC64;
} else if (STRPREFIX(&token[subs[2].rm_so], "armv7l")) {
arch = VIR_ARCH_ARMV7L;
} else if (STRPREFIX(&token[subs[2].rm_so], "aarch64")) {
arch = VIR_ARCH_AARCH64;
} else {
continue;
}
/* Search for existing matching (model,hvm) tuple */
for (i = 0; i < nr_guest_archs; i++) {
if ((guest_archs[i].arch == arch) &&
guest_archs[i].hvm == hvm)
break;
}
/* Too many arch flavours - highly unlikely ! */
if (i >= ARRAY_CARDINALITY(guest_archs))
continue;
/* Didn't find a match, so create a new one */
if (i == nr_guest_archs)
nr_guest_archs++;
guest_archs[i].arch = arch;
guest_archs[i].hvm = hvm;
/* Careful not to overwrite a previous positive
setting with a negative one here - some archs
can do both pae & non-pae, but Xen reports
separately capabilities so we're merging archs */
if (pae)
guest_archs[i].pae = pae;
if (nonpae)
guest_archs[i].nonpae = nonpae;
if (ia64_be)
guest_archs[i].ia64_be = ia64_be;
}
}
regfree(&regex);
for (i = 0; i < nr_guest_archs; ++i) {
virCapsGuestPtr guest;
char const *const xen_machines[] = {guest_archs[i].hvm ? "xenfv" : "xenpv"};
virCapsGuestMachinePtr *machines;
if ((machines = virCapabilitiesAllocMachines(xen_machines, 1)) == NULL)
return -1;
if ((guest = virCapabilitiesAddGuest(caps,
guest_archs[i].hvm ? VIR_DOMAIN_OSTYPE_HVM : VIR_DOMAIN_OSTYPE_XEN,
guest_archs[i].arch,
LIBXL_EXECBIN_DIR "/qemu-system-i386",
(guest_archs[i].hvm ?
LIBXL_FIRMWARE_DIR "/hvmloader" :
NULL),
1,
machines)) == NULL) {
virCapabilitiesFreeMachines(machines, 1);
return -1;
}
machines = NULL;
if (virCapabilitiesAddGuestDomain(guest,
VIR_DOMAIN_VIRT_XEN,
NULL,
NULL,
0,
NULL) == NULL)
return -1;
if (guest_archs[i].pae &&
virCapabilitiesAddGuestFeature(guest,
"pae",
1,
0) == NULL)
return -1;
if (guest_archs[i].nonpae &&
virCapabilitiesAddGuestFeature(guest,
"nonpae",
1,
0) == NULL)
return -1;
if (guest_archs[i].ia64_be &&
virCapabilitiesAddGuestFeature(guest,
"ia64_be",
1,
0) == NULL)
return -1;
if (guest_archs[i].hvm) {
if (virCapabilitiesAddGuestFeature(guest,
"acpi",
1,
1) == NULL)
return -1;
if (virCapabilitiesAddGuestFeature(guest, "apic",
1,
0) == NULL)
return -1;
if (virCapabilitiesAddGuestFeature(guest,
"hap",
1,
1) == NULL)
return -1;
}
}
return 0;
}
static int
libxlMakeDomainOSCaps(const char *machine,
virDomainCapsOSPtr os,
virFirmwarePtr *firmwares,
size_t nfirmwares)
{
virDomainCapsLoaderPtr capsLoader = &os->loader;
size_t i;
os->supported = true;
if (STREQ(machine, "xenpv"))
return 0;
capsLoader->supported = true;
if (VIR_ALLOC_N(capsLoader->values.values, nfirmwares) < 0)
return -1;
for (i = 0; i < nfirmwares; i++) {
if (VIR_STRDUP(capsLoader->values.values[capsLoader->values.nvalues],
firmwares[i]->name) < 0)
return -1;
capsLoader->values.nvalues++;
}
VIR_DOMAIN_CAPS_ENUM_SET(capsLoader->type,
VIR_DOMAIN_LOADER_TYPE_ROM,
VIR_DOMAIN_LOADER_TYPE_PFLASH);
VIR_DOMAIN_CAPS_ENUM_SET(capsLoader->readonly,
VIR_TRISTATE_BOOL_YES);
return 0;
}
static int
libxlMakeDomainDeviceDiskCaps(virDomainCapsDeviceDiskPtr dev)
{
dev->supported = true;
VIR_DOMAIN_CAPS_ENUM_SET(dev->diskDevice,
VIR_DOMAIN_DISK_DEVICE_DISK,
VIR_DOMAIN_DISK_DEVICE_CDROM);
VIR_DOMAIN_CAPS_ENUM_SET(dev->bus,
VIR_DOMAIN_DISK_BUS_IDE,
VIR_DOMAIN_DISK_BUS_SCSI,
VIR_DOMAIN_DISK_BUS_XEN);
return 0;
}
static int
libxlMakeDomainDeviceGraphicsCaps(virDomainCapsDeviceGraphicsPtr dev)
{
dev->supported = true;
VIR_DOMAIN_CAPS_ENUM_SET(dev->type,
VIR_DOMAIN_GRAPHICS_TYPE_SDL,
VIR_DOMAIN_GRAPHICS_TYPE_VNC,
VIR_DOMAIN_GRAPHICS_TYPE_SPICE);
return 0;
}
static int
libxlMakeDomainDeviceVideoCaps(virDomainCapsDeviceVideoPtr dev)
{
dev->supported = true;
VIR_DOMAIN_CAPS_ENUM_SET(dev->modelType,
VIR_DOMAIN_VIDEO_TYPE_VGA,
VIR_DOMAIN_VIDEO_TYPE_CIRRUS,
VIR_DOMAIN_VIDEO_TYPE_XEN);
return 0;
}
static int
libxlMakeDomainDeviceHostdevCaps(virDomainCapsDeviceHostdevPtr dev)
{
dev->supported = true;
/* VIR_DOMAIN_HOSTDEV_MODE_CAPABILITIES is for containers only */
VIR_DOMAIN_CAPS_ENUM_SET(dev->mode,
VIR_DOMAIN_HOSTDEV_MODE_SUBSYS);
VIR_DOMAIN_CAPS_ENUM_SET(dev->startupPolicy,
VIR_DOMAIN_STARTUP_POLICY_DEFAULT,
VIR_DOMAIN_STARTUP_POLICY_MANDATORY,
VIR_DOMAIN_STARTUP_POLICY_REQUISITE,
VIR_DOMAIN_STARTUP_POLICY_OPTIONAL);
VIR_DOMAIN_CAPS_ENUM_SET(dev->subsysType,
VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_PCI);
#ifdef LIBXL_HAVE_PVUSB
VIR_DOMAIN_CAPS_ENUM_SET(dev->subsysType,
VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_USB);
#endif
/* No virDomainHostdevCapsType for libxl */
virDomainCapsEnumClear(&dev->capsType);
virDomainCapsEnumClear(&dev->pciBackend);
VIR_DOMAIN_CAPS_ENUM_SET(dev->pciBackend,
VIR_DOMAIN_HOSTDEV_PCI_BACKEND_XEN);
return 0;
}
virCapsPtr
libxlMakeCapabilities(libxl_ctx *ctx)
{
virCapsPtr caps;
#ifdef LIBXL_HAVE_NO_SUSPEND_RESUME
if ((caps = virCapabilitiesNew(virArchFromHost(), false, false)) == NULL)
#else
if ((caps = virCapabilitiesNew(virArchFromHost(), true, true)) == NULL)
#endif
return NULL;
if (libxlCapsInitHost(ctx, caps) < 0)
goto error;
if (libxlCapsInitNuma(ctx, caps) < 0)
goto error;
if (libxlCapsInitGuests(ctx, caps) < 0)
goto error;
return caps;
error:
virObjectUnref(caps);
return NULL;
}
/*
* Currently Xen has no interface to report maxvcpus supported
* for the various domain types (PV, HVM, PVH). HVM_MAX_VCPUS
* is defined in $xensrc/xen/include/public/hvm/hvm_info_table.h
* PV has no equivalent and is relunctantly set here until Xen
* can report such capabilities.
*/
#define HVM_MAX_VCPUS 128
#define PV_MAX_VCPUS 512
int
libxlMakeDomainCapabilities(virDomainCapsPtr domCaps,
virFirmwarePtr *firmwares,
size_t nfirmwares)
{
virDomainCapsOSPtr os = &domCaps->os;
virDomainCapsDeviceDiskPtr disk = &domCaps->disk;
virDomainCapsDeviceGraphicsPtr graphics = &domCaps->graphics;
virDomainCapsDeviceVideoPtr video = &domCaps->video;
virDomainCapsDeviceHostdevPtr hostdev = &domCaps->hostdev;
if (STREQ(domCaps->machine, "xenfv"))
domCaps->maxvcpus = HVM_MAX_VCPUS;
else
domCaps->maxvcpus = PV_MAX_VCPUS;
if (libxlMakeDomainOSCaps(domCaps->machine, os, firmwares, nfirmwares) < 0 ||
libxlMakeDomainDeviceDiskCaps(disk) < 0 ||
libxlMakeDomainDeviceGraphicsCaps(graphics) < 0 ||
libxlMakeDomainDeviceVideoCaps(video) < 0 ||
libxlMakeDomainDeviceHostdevCaps(hostdev) < 0)
return -1;
return 0;
}
#define LIBXL_QEMU_DM_STR "Options specific to the Xen version:"
int
libxlDomainGetEmulatorType(const virDomainDef *def)
{
int ret = LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN;
virCommandPtr cmd = NULL;
char *output = NULL;
if (def->os.type == VIR_DOMAIN_OSTYPE_HVM) {
if (def->emulator) {
if (!virFileExists(def->emulator))
goto cleanup;
cmd = virCommandNew(def->emulator);
virCommandAddArgList(cmd, "-help", NULL);
virCommandSetOutputBuffer(cmd, &output);
if (virCommandRun(cmd, NULL) < 0)
goto cleanup;
if (strstr(output, LIBXL_QEMU_DM_STR))
ret = LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN_TRADITIONAL;
}
}
cleanup:
VIR_FREE(output);
virCommandFree(cmd);
return ret;
}
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