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-rw-r--r--arch/x86/include/asm/hypervisor.h13
-rw-r--r--arch/x86/kernel/cpu/hypervisor.c7
-rw-r--r--arch/x86/kernel/cpu/vmware.c13
-rw-r--r--arch/x86/kernel/kvm.c1
-rw-r--r--arch/x86/xen/enlighten.c1
5 files changed, 26 insertions, 9 deletions
diff --git a/arch/x86/include/asm/hypervisor.h b/arch/x86/include/asm/hypervisor.h
index b518c7509933..86095ed14135 100644
--- a/arch/x86/include/asm/hypervisor.h
+++ b/arch/x86/include/asm/hypervisor.h
@@ -25,6 +25,7 @@
extern void init_hypervisor(struct cpuinfo_x86 *c);
extern void init_hypervisor_platform(void);
+extern bool hypervisor_x2apic_available(void);
/*
* x86 hypervisor information
@@ -41,6 +42,9 @@ struct hypervisor_x86 {
/* Platform setup (run once per boot) */
void (*init_platform)(void);
+
+ /* X2APIC detection (run once per boot) */
+ bool (*x2apic_available)(void);
};
extern const struct hypervisor_x86 *x86_hyper;
@@ -51,13 +55,4 @@ extern const struct hypervisor_x86 x86_hyper_ms_hyperv;
extern const struct hypervisor_x86 x86_hyper_xen_hvm;
extern const struct hypervisor_x86 x86_hyper_kvm;
-static inline bool hypervisor_x2apic_available(void)
-{
- if (kvm_para_available())
- return true;
- if (xen_x2apic_para_available())
- return true;
- return false;
-}
-
#endif
diff --git a/arch/x86/kernel/cpu/hypervisor.c b/arch/x86/kernel/cpu/hypervisor.c
index a8f8fa9769d6..1e7e84a02eba 100644
--- a/arch/x86/kernel/cpu/hypervisor.c
+++ b/arch/x86/kernel/cpu/hypervisor.c
@@ -79,3 +79,10 @@ void __init init_hypervisor_platform(void)
if (x86_hyper->init_platform)
x86_hyper->init_platform();
}
+
+bool __init hypervisor_x2apic_available(void)
+{
+ return x86_hyper &&
+ x86_hyper->x2apic_available &&
+ x86_hyper->x2apic_available();
+}
diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c
index d22d0c4edcfd..03a36321ec54 100644
--- a/arch/x86/kernel/cpu/vmware.c
+++ b/arch/x86/kernel/cpu/vmware.c
@@ -33,6 +33,9 @@
#define VMWARE_PORT_CMD_GETVERSION 10
#define VMWARE_PORT_CMD_GETHZ 45
+#define VMWARE_PORT_CMD_GETVCPU_INFO 68
+#define VMWARE_PORT_CMD_LEGACY_X2APIC 3
+#define VMWARE_PORT_CMD_VCPU_RESERVED 31
#define VMWARE_PORT(cmd, eax, ebx, ecx, edx) \
__asm__("inl (%%dx)" : \
@@ -125,10 +128,20 @@ static void __cpuinit vmware_set_cpu_features(struct cpuinfo_x86 *c)
set_cpu_cap(c, X86_FEATURE_TSC_RELIABLE);
}
+/* Checks if hypervisor supports x2apic without VT-D interrupt remapping. */
+static bool __init vmware_legacy_x2apic_available(void)
+{
+ uint32_t eax, ebx, ecx, edx;
+ VMWARE_PORT(GETVCPU_INFO, eax, ebx, ecx, edx);
+ return (eax & (1 << VMWARE_PORT_CMD_VCPU_RESERVED)) == 0 &&
+ (eax & (1 << VMWARE_PORT_CMD_LEGACY_X2APIC)) != 0;
+}
+
const __refconst struct hypervisor_x86 x86_hyper_vmware = {
.name = "VMware",
.detect = vmware_platform,
.set_cpu_features = vmware_set_cpu_features,
.init_platform = vmware_platform_setup,
+ .x2apic_available = vmware_legacy_x2apic_available,
};
EXPORT_SYMBOL(x86_hyper_vmware);
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index 9c2bd8bd4b4c..2b44ea5f269d 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -505,6 +505,7 @@ static bool __init kvm_detect(void)
const struct hypervisor_x86 x86_hyper_kvm __refconst = {
.name = "KVM",
.detect = kvm_detect,
+ .x2apic_available = kvm_para_available,
};
EXPORT_SYMBOL_GPL(x86_hyper_kvm);
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 138e5667409a..8b4c56d85ca0 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1668,6 +1668,7 @@ const struct hypervisor_x86 x86_hyper_xen_hvm __refconst = {
.name = "Xen HVM",
.detect = xen_hvm_platform,
.init_platform = xen_hvm_guest_init,
+ .x2apic_available = xen_x2apic_para_available,
};
EXPORT_SYMBOL(x86_hyper_xen_hvm);
#endif