mirror of
https://gitlab.com/libvirt/libvirt.git
synced 2025-03-07 17:28:15 +00:00
cpu: Introduce getHost support for ARM CPU driver
Introduce getHost support for ARM CPU driver, read CPU vendor_id, part_id and flags from registers directly. These codes will only be compiled on aarch64 hardware. Signed-off-by: Zhenyu Zheng <zheng.zhenyu@outlook.com> Message-Id: <TY2PR01MB311380AFE294266B4E87B85699BF0@TY2PR01MB3113.jpnprd01.prod.outlook.com> Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
This commit is contained in:
parent
e7166956c7
commit
424c760730
@ -21,6 +21,10 @@
|
|||||||
*/
|
*/
|
||||||
|
|
||||||
#include <config.h>
|
#include <config.h>
|
||||||
|
#if defined(__aarch64__)
|
||||||
|
# include <asm/hwcap.h>
|
||||||
|
# include <sys/auxv.h>
|
||||||
|
#endif
|
||||||
|
|
||||||
#include "viralloc.h"
|
#include "viralloc.h"
|
||||||
#include "cpu.h"
|
#include "cpu.h"
|
||||||
@ -31,6 +35,13 @@
|
|||||||
#include "virxml.h"
|
#include "virxml.h"
|
||||||
|
|
||||||
#define VIR_FROM_THIS VIR_FROM_CPU
|
#define VIR_FROM_THIS VIR_FROM_CPU
|
||||||
|
#if defined(__aarch64__)
|
||||||
|
/* Shift bit mask for parsing cpu flags */
|
||||||
|
# define BIT_SHIFTS(n) (1UL << (n))
|
||||||
|
/* The current max number of cpu flags on ARM is 32 */
|
||||||
|
# define MAX_CPU_FLAGS 32
|
||||||
|
#endif
|
||||||
|
|
||||||
|
|
||||||
VIR_LOG_INIT("cpu.cpu_arm");
|
VIR_LOG_INIT("cpu.cpu_arm");
|
||||||
|
|
||||||
@ -291,6 +302,22 @@ virCPUarmModelFind(virCPUarmMapPtr map,
|
|||||||
return NULL;
|
return NULL;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
#if defined(__aarch64__)
|
||||||
|
static virCPUarmModelPtr
|
||||||
|
virCPUarmModelFindByPVR(virCPUarmMapPtr map,
|
||||||
|
unsigned long pvr)
|
||||||
|
{
|
||||||
|
size_t i;
|
||||||
|
|
||||||
|
for (i = 0; i < map->nmodels; i++) {
|
||||||
|
if (map->models[i]->data.pvr == pvr)
|
||||||
|
return map->models[i];
|
||||||
|
}
|
||||||
|
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
static int
|
static int
|
||||||
virCPUarmModelParse(xmlXPathContextPtr ctxt,
|
virCPUarmModelParse(xmlXPathContextPtr ctxt,
|
||||||
const char *name,
|
const char *name,
|
||||||
@ -469,11 +496,148 @@ virCPUarmValidateFeatures(virCPUDefPtr cpu)
|
|||||||
return 0;
|
return 0;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
#if defined(__aarch64__)
|
||||||
|
/* Generate human readable flag list according to the order of */
|
||||||
|
/* AT_HWCAP bit map */
|
||||||
|
const char *aarch64_cpu_flags[MAX_CPU_FLAGS] = {
|
||||||
|
"fp", "asimd", "evtstrm", "aes", "pmull", "sha1", "sha2",
|
||||||
|
"crc32", "atomics", "fphp", "asimdhp", "cpuid", "asimdrdm",
|
||||||
|
"jscvt", "fcma", "lrcpc", "dcpop", "sha3", "sm3", "sm4",
|
||||||
|
"asimddp", "sha512", "sve", "asimdfhm", "dit", "uscat",
|
||||||
|
"ilrcpc", "flagm", "ssbs", "sb", "paca", "pacg"};
|
||||||
|
/**
|
||||||
|
* virCPUarmCpuDataFromRegs:
|
||||||
|
*
|
||||||
|
* @data: 64-bit arm CPU specific data
|
||||||
|
*
|
||||||
|
* Fetches CPU vendor_id and part_id from MIDR_EL1 register, parse CPU
|
||||||
|
* flags from AT_HWCAP. There are currently 32 valid flags on ARM arch
|
||||||
|
* represented by each bit.
|
||||||
|
*/
|
||||||
|
static int
|
||||||
|
virCPUarmCpuDataFromRegs(virCPUarmData *data)
|
||||||
|
{
|
||||||
|
unsigned long cpuid;
|
||||||
|
unsigned long hwcaps;
|
||||||
|
VIR_AUTOSTRINGLIST features = NULL;
|
||||||
|
int cpu_feature_index = 0;
|
||||||
|
size_t i;
|
||||||
|
|
||||||
|
if (!(getauxval(AT_HWCAP) & HWCAP_CPUID)) {
|
||||||
|
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
|
||||||
|
_("CPUID registers unavailable"));
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* read the cpuid data from MIDR_EL1 register */
|
||||||
|
asm("mrs %0, MIDR_EL1" : "=r" (cpuid));
|
||||||
|
VIR_DEBUG("CPUID read from register: 0x%016lx", cpuid);
|
||||||
|
|
||||||
|
/* parse the coresponding part_id bits */
|
||||||
|
data->pvr = (cpuid >> 4) & 0xfff;
|
||||||
|
/* parse the coresponding vendor_id bits */
|
||||||
|
data->vendor_id = (cpuid >> 24) & 0xff;
|
||||||
|
|
||||||
|
hwcaps = getauxval(AT_HWCAP);
|
||||||
|
VIR_DEBUG("CPU flags read from register: 0x%016lx", hwcaps);
|
||||||
|
|
||||||
|
features = g_new0(char *, MAX_CPU_FLAGS + 1);
|
||||||
|
|
||||||
|
/* shift bit map mask to parse for CPU flags */
|
||||||
|
for (i = 0; i < MAX_CPU_FLAGS; i++) {
|
||||||
|
if (hwcaps & BIT_SHIFTS(i)) {
|
||||||
|
features[cpu_feature_index] = g_strdup(aarch64_cpu_flags[i]);
|
||||||
|
cpu_feature_index++;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
if (cpu_feature_index > 0)
|
||||||
|
data->features = g_steal_pointer(&features);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int
|
||||||
|
virCPUarmDecode(virCPUDefPtr cpu,
|
||||||
|
const virCPUarmData *cpuData,
|
||||||
|
virDomainCapsCPUModelsPtr models)
|
||||||
|
{
|
||||||
|
size_t i;
|
||||||
|
virCPUarmMapPtr map;
|
||||||
|
virCPUarmModelPtr model;
|
||||||
|
virCPUarmVendorPtr vendor = NULL;
|
||||||
|
|
||||||
|
if (!cpuData || !(map = virCPUarmGetMap()))
|
||||||
|
return -1;
|
||||||
|
|
||||||
|
if (!(model = virCPUarmModelFindByPVR(map, cpuData->pvr))) {
|
||||||
|
virReportError(VIR_ERR_OPERATION_FAILED,
|
||||||
|
_("Cannot find CPU model with PVR 0x%03lx"),
|
||||||
|
cpuData->pvr);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (!virCPUModelIsAllowed(model->name, models)) {
|
||||||
|
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
|
||||||
|
_("CPU model %s is not supported by hypervisor"),
|
||||||
|
model->name);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
cpu->model = g_strdup(model->name);
|
||||||
|
|
||||||
|
if (cpuData->vendor_id &&
|
||||||
|
!(vendor = virCPUarmVendorFindByID(map, cpuData->vendor_id))) {
|
||||||
|
virReportError(VIR_ERR_OPERATION_FAILED,
|
||||||
|
_("Cannot find CPU vendor with vendor id 0x%02lx"),
|
||||||
|
cpuData->vendor_id);
|
||||||
|
return -1;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (vendor)
|
||||||
|
cpu->vendor = g_strdup(vendor->name);
|
||||||
|
|
||||||
|
if (cpuData->features) {
|
||||||
|
cpu->nfeatures = virStringListLength((const char **)cpuData->features);
|
||||||
|
cpu->features = g_new0(virCPUFeatureDef, cpu->nfeatures);
|
||||||
|
|
||||||
|
for (i = 0; i < cpu->nfeatures; i++) {
|
||||||
|
cpu->features[i].policy = VIR_CPU_FEATURE_REQUIRE;
|
||||||
|
cpu->features[i].name = g_strdup(cpuData->features[i]);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int
|
||||||
|
virCPUarmGetHost(virCPUDefPtr cpu,
|
||||||
|
virDomainCapsCPUModelsPtr models)
|
||||||
|
{
|
||||||
|
g_autoptr(virCPUData) cpuData = NULL;
|
||||||
|
|
||||||
|
if (virCPUarmDriverInitialize() < 0)
|
||||||
|
return -1;
|
||||||
|
|
||||||
|
if (!(cpuData = virCPUDataNew(archs[0])))
|
||||||
|
return -1;
|
||||||
|
|
||||||
|
if (virCPUarmCpuDataFromRegs(&cpuData->data.arm) < 0)
|
||||||
|
return -1;
|
||||||
|
|
||||||
|
return virCPUarmDecode(cpu, &cpuData->data.arm, models);
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
|
|
||||||
struct cpuArchDriver cpuDriverArm = {
|
struct cpuArchDriver cpuDriverArm = {
|
||||||
.name = "arm",
|
.name = "arm",
|
||||||
.arch = archs,
|
.arch = archs,
|
||||||
.narch = G_N_ELEMENTS(archs),
|
.narch = G_N_ELEMENTS(archs),
|
||||||
.compare = virCPUarmCompare,
|
.compare = virCPUarmCompare,
|
||||||
|
#if defined(__aarch64__)
|
||||||
|
.getHost = virCPUarmGetHost,
|
||||||
|
#endif
|
||||||
.decode = NULL,
|
.decode = NULL,
|
||||||
.encode = NULL,
|
.encode = NULL,
|
||||||
.dataFree = virCPUarmDataFree,
|
.dataFree = virCPUarmDataFree,
|
||||||
|
Loading…
x
Reference in New Issue
Block a user