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Diffstat (limited to 'arch/powerpc/include/asm/kvm_para.h')
-rw-r--r--arch/powerpc/include/asm/kvm_para.h114
1 files changed, 113 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/kvm_para.h b/arch/powerpc/include/asm/kvm_para.h
index e402999ba193..556fd59ee0f1 100644
--- a/arch/powerpc/include/asm/kvm_para.h
+++ b/arch/powerpc/include/asm/kvm_para.h
@@ -21,6 +21,7 @@
#define __POWERPC_KVM_PARA_H__
#include <linux/types.h>
+#include <linux/of.h>
struct kvm_vcpu_arch_shared {
__u64 sprg0;
@@ -34,16 +35,127 @@ struct kvm_vcpu_arch_shared {
__u32 dsisr;
};
+#define KVM_SC_MAGIC_R0 0x4b564d21 /* "KVM!" */
+#define HC_VENDOR_KVM (42 << 16)
+#define HC_EV_SUCCESS 0
+#define HC_EV_UNIMPLEMENTED 12
+
#ifdef __KERNEL__
+#ifdef CONFIG_KVM_GUEST
+
+static inline int kvm_para_available(void)
+{
+ struct device_node *hyper_node;
+
+ hyper_node = of_find_node_by_path("/hypervisor");
+ if (!hyper_node)
+ return 0;
+
+ if (!of_device_is_compatible(hyper_node, "linux,kvm"))
+ return 0;
+
+ return 1;
+}
+
+extern unsigned long kvm_hypercall(unsigned long *in,
+ unsigned long *out,
+ unsigned long nr);
+
+#else
+
static inline int kvm_para_available(void)
{
return 0;
}
+static unsigned long kvm_hypercall(unsigned long *in,
+ unsigned long *out,
+ unsigned long nr)
+{
+ return HC_EV_UNIMPLEMENTED;
+}
+
+#endif
+
+static inline long kvm_hypercall0_1(unsigned int nr, unsigned long *r2)
+{
+ unsigned long in[8];
+ unsigned long out[8];
+ unsigned long r;
+
+ r = kvm_hypercall(in, out, nr | HC_VENDOR_KVM);
+ *r2 = out[0];
+
+ return r;
+}
+
+static inline long kvm_hypercall0(unsigned int nr)
+{
+ unsigned long in[8];
+ unsigned long out[8];
+
+ return kvm_hypercall(in, out, nr | HC_VENDOR_KVM);
+}
+
+static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
+{
+ unsigned long in[8];
+ unsigned long out[8];
+
+ in[0] = p1;
+ return kvm_hypercall(in, out, nr | HC_VENDOR_KVM);
+}
+
+static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
+ unsigned long p2)
+{
+ unsigned long in[8];
+ unsigned long out[8];
+
+ in[0] = p1;
+ in[1] = p2;
+ return kvm_hypercall(in, out, nr | HC_VENDOR_KVM);
+}
+
+static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
+ unsigned long p2, unsigned long p3)
+{
+ unsigned long in[8];
+ unsigned long out[8];
+
+ in[0] = p1;
+ in[1] = p2;
+ in[2] = p3;
+ return kvm_hypercall(in, out, nr | HC_VENDOR_KVM);
+}
+
+static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
+ unsigned long p2, unsigned long p3,
+ unsigned long p4)
+{
+ unsigned long in[8];
+ unsigned long out[8];
+
+ in[0] = p1;
+ in[1] = p2;
+ in[2] = p3;
+ in[3] = p4;
+ return kvm_hypercall(in, out, nr | HC_VENDOR_KVM);
+}
+
+
static inline unsigned int kvm_arch_para_features(void)
{
- return 0;
+ unsigned long r;
+
+ if (!kvm_para_available())
+ return 0;
+
+ if(kvm_hypercall0_1(KVM_HC_FEATURES, &r))
+ return 0;
+
+ return r;
}
#endif /* __KERNEL__ */