[dpdk-dev] [PATCH] eal/x86: get hypervisor name
Thomas Monjalon
thomas at monjalon.net
Thu Nov 30 22:47:20 CET 2017
The CPUID instruction is catched by hypervisor which can return
a flag indicating one is running, and its name.
Suggested-by: Stephen Hemminger <sthemmin at microsoft.com>
Signed-off-by: Thomas Monjalon <thomas at monjalon.net>
---
warning: to be tested
---
lib/librte_eal/common/arch/arm/rte_cpuflags.c | 6 +++++
lib/librte_eal/common/arch/ppc_64/rte_cpuflags.c | 6 +++++
lib/librte_eal/common/arch/x86/rte_cpuflags.c | 30 ++++++++++++++++++++++
.../common/include/arch/x86/rte_cpuflags.h | 1 +
.../common/include/generic/rte_cpuflags.h | 14 ++++++++++
lib/librte_eal/rte_eal_version.map | 9 ++++++-
6 files changed, 65 insertions(+), 1 deletion(-)
diff --git a/lib/librte_eal/common/arch/arm/rte_cpuflags.c b/lib/librte_eal/common/arch/arm/rte_cpuflags.c
index 88f1cbe37..f1f0cb51d 100644
--- a/lib/librte_eal/common/arch/arm/rte_cpuflags.c
+++ b/lib/librte_eal/common/arch/arm/rte_cpuflags.c
@@ -178,3 +178,9 @@ rte_cpu_get_flag_name(enum rte_cpu_flag_t feature)
return NULL;
return rte_cpu_feature_table[feature].name;
}
+
+enum rte_hypervisor
+rte_hypervisor_get_name(void)
+{
+ return RTE_HYPERVISOR_UNKNOWN;
+}
diff --git a/lib/librte_eal/common/arch/ppc_64/rte_cpuflags.c b/lib/librte_eal/common/arch/ppc_64/rte_cpuflags.c
index 970a61c5e..b905cbd2c 100644
--- a/lib/librte_eal/common/arch/ppc_64/rte_cpuflags.c
+++ b/lib/librte_eal/common/arch/ppc_64/rte_cpuflags.c
@@ -146,3 +146,9 @@ rte_cpu_get_flag_name(enum rte_cpu_flag_t feature)
return NULL;
return rte_cpu_feature_table[feature].name;
}
+
+enum rte_hypervisor
+rte_hypervisor_get_name(void)
+{
+ return RTE_HYPERVISOR_UNKNOWN;
+}
diff --git a/lib/librte_eal/common/arch/x86/rte_cpuflags.c b/lib/librte_eal/common/arch/x86/rte_cpuflags.c
index 7d4a0fefb..76893b8f1 100644
--- a/lib/librte_eal/common/arch/x86/rte_cpuflags.c
+++ b/lib/librte_eal/common/arch/x86/rte_cpuflags.c
@@ -34,6 +34,7 @@
#include "rte_cpuflags.h"
#include <stdio.h>
+#include <string.h>
#include <errno.h>
#include <stdint.h>
#include <cpuid.h>
@@ -92,6 +93,7 @@ const struct feature_entry rte_cpu_feature_table[] = {
FEAT_DEF(AVX, 0x00000001, 0, RTE_REG_ECX, 28)
FEAT_DEF(F16C, 0x00000001, 0, RTE_REG_ECX, 29)
FEAT_DEF(RDRAND, 0x00000001, 0, RTE_REG_ECX, 30)
+ FEAT_DEF(HYPERVISOR, 0x00000001, 0, RTE_REG_ECX, 31)
FEAT_DEF(FPU, 0x00000001, 0, RTE_REG_EDX, 0)
FEAT_DEF(VME, 0x00000001, 0, RTE_REG_EDX, 1)
@@ -194,3 +196,31 @@ rte_cpu_get_flag_name(enum rte_cpu_flag_t feature)
return NULL;
return rte_cpu_feature_table[feature].name;
}
+
+/* See http://lwn.net/Articles/301888/ */
+#define HYPERVISOR_INFO_LEAF 0x40000000
+
+enum rte_hypervisor
+rte_hypervisor_get_name(void)
+{
+ cpuid_registers_t regs;
+ char name[13];
+
+ if (!rte_cpu_get_flag_enabled(RTE_CPUFLAG_HYPERVISOR))
+ return RTE_HYPERVISOR_NONE;
+
+ __cpuid(HYPERVISOR_INFO_LEAF,
+ regs[RTE_REG_EAX], regs[RTE_REG_EBX],
+ regs[RTE_REG_ECX], regs[RTE_REG_EDX]);
+ for (int reg = 1; reg < 4; reg++)
+ memcpy(name + (reg - 1) * 4, ®s[reg], 4);
+ name[12] = '\0';
+
+ if (strcmp("KVMKVMKVM", name) == 0)
+ return RTE_HYPERVISOR_KVM;
+ if (strcmp("Microsoft Hv", name) == 0)
+ return RTE_HYPERVISOR_HYPERV;
+ if (strcmp("VMwareVMware", name) == 0)
+ return RTE_HYPERVISOR_VMWARE;
+ return RTE_HYPERVISOR_UNKNOWN;
+}
diff --git a/lib/librte_eal/common/include/arch/x86/rte_cpuflags.h b/lib/librte_eal/common/include/arch/x86/rte_cpuflags.h
index 26204fabb..686ac07f3 100644
--- a/lib/librte_eal/common/include/arch/x86/rte_cpuflags.h
+++ b/lib/librte_eal/common/include/arch/x86/rte_cpuflags.h
@@ -69,6 +69,7 @@ enum rte_cpu_flag_t {
RTE_CPUFLAG_AVX, /**< AVX */
RTE_CPUFLAG_F16C, /**< F16C */
RTE_CPUFLAG_RDRAND, /**< RDRAND */
+ RTE_CPUFLAG_HYPERVISOR, /**< Running on a hypervisor */
/* (EAX 01h) EDX features */
RTE_CPUFLAG_FPU, /**< FPU */
diff --git a/lib/librte_eal/common/include/generic/rte_cpuflags.h b/lib/librte_eal/common/include/generic/rte_cpuflags.h
index c1c5551fc..3832fb851 100644
--- a/lib/librte_eal/common/include/generic/rte_cpuflags.h
+++ b/lib/librte_eal/common/include/generic/rte_cpuflags.h
@@ -93,4 +93,18 @@ rte_cpu_check_supported(void);
int
rte_cpu_is_supported(void);
+enum rte_hypervisor {
+ RTE_HYPERVISOR_NONE,
+ RTE_HYPERVISOR_KVM,
+ RTE_HYPERVISOR_HYPERV,
+ RTE_HYPERVISOR_VMWARE,
+ RTE_HYPERVISOR_UNKNOWN
+};
+
+/**
+ * Get the type of hypervisor it is running on.
+ */
+enum rte_hypervisor
+rte_hypervisor_get_name(void);
+
#endif /* _RTE_CPUFLAGS_H_ */
diff --git a/lib/librte_eal/rte_eal_version.map b/lib/librte_eal/rte_eal_version.map
index f4f46c1be..3f8d81577 100644
--- a/lib/librte_eal/rte_eal_version.map
+++ b/lib/librte_eal/rte_eal_version.map
@@ -200,6 +200,13 @@ DPDK_17.11 {
} DPDK_17.08;
+DPDK_18.02 {
+ global:
+
+ rte_hypervisor_get_name;
+
+} DPDK_17.11;
+
EXPERIMENTAL {
global:
@@ -235,4 +242,4 @@ EXPERIMENTAL {
rte_service_set_stats_enable;
rte_service_start_with_defaults;
-} DPDK_17.11;
+} DPDK_18.02;
--
2.15.0
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