[linux-2.6-block.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 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
18068523 GOC	13	#define KVM_FEATURE_CLOCKSOURCE 0
	14
	15	#define MSR_KVM_WALL_CLOCK 0x11
	16	#define MSR_KVM_SYSTEM_TIME 0x12
5f43238d CB	17
	18	#ifdef __KERNEL__
	19	#include <asm/processor.h>
	20
18068523 GOC	21	/* xen binary-compatible interface. See xen headers for details */
	22	struct kvm_vcpu_time_info {
	23	uint32_t version;
	24	uint32_t pad0;
	25	uint64_t tsc_timestamp;
	26	uint64_t system_time;
	27	uint32_t tsc_to_system_mul;
	28	int8_t tsc_shift;
	29	int8_t pad[3];
	30	} __attribute__((__packed__)); /* 32 bytes */
	31
	32	struct kvm_wall_clock {
	33	uint32_t wc_version;
	34	uint32_t wc_sec;
	35	uint32_t wc_nsec;
	36	} __attribute__((__packed__));
	37
	38
	39	extern void kvmclock_init(void);
	40
	41
5f43238d CB	42	/* This instruction is vmcall. On non-VT architectures, it will generate a
	43	* trap that we will then rewrite to the appropriate instruction.
	44	*/
	45	#define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1"
	46
	47	/* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun
	48	* instruction. The hypervisor may replace it with something else but only the
	49	* instructions are guaranteed to be supported.
	50	*
	51	* Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
	52	* The hypercall number should be placed in rax and the return value will be
	53	* placed in rax. No other registers will be clobbered unless explicited
	54	* noted by the particular hypercall.
	55	*/
	56
	57	static inline long kvm_hypercall0(unsigned int nr)
	58	{
	59	long ret;
	60	asm volatile(KVM_HYPERCALL
	61	: "=a"(ret)
	62	: "a"(nr));
	63	return ret;
	64	}
	65
	66	static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
	67	{
	68	long ret;
	69	asm volatile(KVM_HYPERCALL
	70	: "=a"(ret)
	71	: "a"(nr), "b"(p1));
	72	return ret;
	73	}
	74
	75	static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
	76	unsigned long p2)
	77	{
	78	long ret;
	79	asm volatile(KVM_HYPERCALL
	80	: "=a"(ret)
	81	: "a"(nr), "b"(p1), "c"(p2));
	82	return ret;
	83	}
	84
	85	static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
	86	unsigned long p2, unsigned long p3)
	87	{
	88	long ret;
	89	asm volatile(KVM_HYPERCALL
	90	: "=a"(ret)
	91	: "a"(nr), "b"(p1), "c"(p2), "d"(p3));
	92	return ret;
	93	}
	94
	95	static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
	96	unsigned long p2, unsigned long p3,
	97	unsigned long p4)
	98	{
	99	long ret;
	100	asm volatile(KVM_HYPERCALL
	101	: "=a"(ret)
	102	: "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4));
	103	return ret;
	104	}
	105
106	static inline int kvm_para_available(void)
107	{
108	unsigned int eax, ebx, ecx, edx;
109	char signature[13];
110
111	cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
112	memcpy(signature + 0, &ebx, 4);
113	memcpy(signature + 4, &ecx, 4);
114	memcpy(signature + 8, &edx, 4);
115	signature[12] = 0;
116
117	if (strcmp(signature, "KVMKVMKVM") == 0)
118	return 1;
119
120	return 0;
121	}
122
123	static inline unsigned int kvm_arch_para_features(void)
124	{
125	return cpuid_eax(KVM_CPUID_FEATURES);
126	}
127
128	#endif
129
130	#endif