[deliverable/linux.git] / include / asm-x86 / kvm_para.h

#ifndef __X86_KVM_PARA_H
#define __X86_KVM_PARA_H

/* This CPUID returns the signature 'KVMKVMKVM' in ebx, ecx, and edx.  It
 * should be used to determine that a VM is running under KVM.
 */
#define KVM_CPUID_SIGNATURE	0x40000000

/* This CPUID returns a feature bitmap in eax.  Before enabling a particular
 * paravirtualization, the appropriate feature bit should be checked.
 */
#define KVM_CPUID_FEATURES	0x40000001
#define KVM_FEATURE_CLOCKSOURCE		0
#define KVM_FEATURE_NOP_IO_DELAY	1

#define MSR_KVM_WALL_CLOCK  0x11
#define MSR_KVM_SYSTEM_TIME 0x12

#ifdef __KERNEL__
#include <asm/processor.h>

/* xen binary-compatible interface. See xen headers for details */
struct kvm_vcpu_time_info {
	uint32_t version;
	uint32_t pad0;
	uint64_t tsc_timestamp;
	uint64_t system_time;
	uint32_t tsc_to_system_mul;
	int8_t   tsc_shift;
	int8_t	 pad[3];
} __attribute__((__packed__)); /* 32 bytes */

struct kvm_wall_clock {
	uint32_t wc_version;
	uint32_t wc_sec;
	uint32_t wc_nsec;
} __attribute__((__packed__));


extern void kvmclock_init(void);


/* This instruction is vmcall.  On non-VT architectures, it will generate a
 * trap that we will then rewrite to the appropriate instruction.
 */
#define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1"

/* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun
 * instruction.  The hypervisor may replace it with something else but only the
 * instructions are guaranteed to be supported.
 *
 * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
 * The hypercall number should be placed in rax and the return value will be
 * placed in rax.  No other registers will be clobbered unless explicited
 * noted by the particular hypercall.
 */

static inline long kvm_hypercall0(unsigned int nr)
{
	long ret;
	asm volatile(KVM_HYPERCALL
		     : "=a"(ret)
		     : "a"(nr));
	return ret;
}

static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
{
	long ret;
	asm volatile(KVM_HYPERCALL
		     : "=a"(ret)
		     : "a"(nr), "b"(p1));
	return ret;
}

static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
				  unsigned long p2)
{
	long ret;
	asm volatile(KVM_HYPERCALL
		     : "=a"(ret)
		     : "a"(nr), "b"(p1), "c"(p2));
	return ret;
}

static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
				  unsigned long p2, unsigned long p3)
{
	long ret;
	asm volatile(KVM_HYPERCALL
		     : "=a"(ret)
		     : "a"(nr), "b"(p1), "c"(p2), "d"(p3));
	return ret;
}

static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
				  unsigned long p2, unsigned long p3,
				  unsigned long p4)
{
	long ret;
	asm volatile(KVM_HYPERCALL
		     : "=a"(ret)
		     : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4));
	return ret;
}

static inline int kvm_para_available(void)
{
	unsigned int eax, ebx, ecx, edx;
	char signature[13];

	cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
	memcpy(signature + 0, &ebx, 4);
	memcpy(signature + 4, &ecx, 4);
	memcpy(signature + 8, &edx, 4);
	signature[12] = 0;

	if (strcmp(signature, "KVMKVMKVM") == 0)
		return 1;

	return 0;
}

static inline unsigned int kvm_arch_para_features(void)
{
	return cpuid_eax(KVM_CPUID_FEATURES);
}

#endif

#endif
Commit	Line	Data
5f43238d CB	1	#ifndef __X86_KVM_PARA_H
	2	#define __X86_KVM_PARA_H
	3
	4	/* This CPUID returns the signature 'KVMKVMKVM' in ebx, ecx, and edx. It
	5	* should be used to determine that a VM is running under KVM.
	6	*/
	7	#define KVM_CPUID_SIGNATURE 0x40000000
	8
	9	/* This CPUID returns a feature bitmap in eax. Before enabling a particular
	10	* paravirtualization, the appropriate feature bit should be checked.
	11	*/
	12	#define KVM_CPUID_FEATURES 0x40000001
a28e4f5a MT	13	#define KVM_FEATURE_CLOCKSOURCE 0
a28e4f5a MT	14	#define KVM_FEATURE_NOP_IO_DELAY 1
18068523 GOC	15
	16	#define MSR_KVM_WALL_CLOCK 0x11
	17	#define MSR_KVM_SYSTEM_TIME 0x12
5f43238d CB	18
	19	#ifdef __KERNEL__
	20	#include <asm/processor.h>
	21
18068523 GOC	22	/* xen binary-compatible interface. See xen headers for details */
	23	struct kvm_vcpu_time_info {
	24	uint32_t version;
	25	uint32_t pad0;
	26	uint64_t tsc_timestamp;
	27	uint64_t system_time;
	28	uint32_t tsc_to_system_mul;
	29	int8_t tsc_shift;
	30	int8_t pad[3];
	31	} __attribute__((__packed__)); /* 32 bytes */
	32
	33	struct kvm_wall_clock {
	34	uint32_t wc_version;
	35	uint32_t wc_sec;
	36	uint32_t wc_nsec;
	37	} __attribute__((__packed__));
	38
	39
	40	extern void kvmclock_init(void);
	41
	42
5f43238d CB	43	/* This instruction is vmcall. On non-VT architectures, it will generate a
	44	* trap that we will then rewrite to the appropriate instruction.
	45	*/
	46	#define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1"
	47
	48	/* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun
	49	* instruction. The hypervisor may replace it with something else but only the
	50	* instructions are guaranteed to be supported.
	51	*
	52	* Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
	53	* The hypercall number should be placed in rax and the return value will be
	54	* placed in rax. No other registers will be clobbered unless explicited
	55	* noted by the particular hypercall.
	56	*/
	57
	58	static inline long kvm_hypercall0(unsigned int nr)
	59	{
	60	long ret;
	61	asm volatile(KVM_HYPERCALL
	62	: "=a"(ret)
	63	: "a"(nr));
	64	return ret;
	65	}
	66
	67	static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
	68	{
	69	long ret;
	70	asm volatile(KVM_HYPERCALL
	71	: "=a"(ret)
	72	: "a"(nr), "b"(p1));
	73	return ret;
	74	}
	75
	76	static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
	77	unsigned long p2)
	78	{
	79	long ret;
	80	asm volatile(KVM_HYPERCALL
	81	: "=a"(ret)
	82	: "a"(nr), "b"(p1), "c"(p2));
	83	return ret;
	84	}
	85
	86	static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
	87	unsigned long p2, unsigned long p3)
	88	{
	89	long ret;
	90	asm volatile(KVM_HYPERCALL
	91	: "=a"(ret)
	92	: "a"(nr), "b"(p1), "c"(p2), "d"(p3));
	93	return ret;
	94	}
	95
	96	static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
	97	unsigned long p2, unsigned long p3,
	98	unsigned long p4)
	99	{
	100	long ret;
	101	asm volatile(KVM_HYPERCALL
	102	: "=a"(ret)
	103	: "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4));
	104	return ret;
	105	}
	106
107	static inline int kvm_para_available(void)
108	{
109	unsigned int eax, ebx, ecx, edx;
110	char signature[13];
111
112	cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
113	memcpy(signature + 0, &ebx, 4);
114	memcpy(signature + 4, &ecx, 4);
115	memcpy(signature + 8, &edx, 4);
116	signature[12] = 0;
117
118	if (strcmp(signature, "KVMKVMKVM") == 0)
119	return 1;
120
121	return 0;
122	}
123
124	static inline unsigned int kvm_arch_para_features(void)
125	{
126	return cpuid_eax(KVM_CPUID_FEATURES);
127	}
128
129	#endif
130
131	#endif