[mirror_ubuntu-hirsute-kernel.git] / arch / x86 / include / asm / kvm_para.h

#ifndef _ASM_X86_KVM_PARA_H
#define _ASM_X86_KVM_PARA_H

#include <linux/types.h>
#include <asm/hyperv.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 KVM_FEATURE_MMU_OP		2

#define MSR_KVM_WALL_CLOCK  0x11
#define MSR_KVM_SYSTEM_TIME 0x12

#define KVM_MAX_MMU_OP_BATCH           32

/* Operations for KVM_HC_MMU_OP */
#define KVM_MMU_OP_WRITE_PTE            1
#define KVM_MMU_OP_FLUSH_TLB	        2
#define KVM_MMU_OP_RELEASE_PT	        3

/* Payload for KVM_HC_MMU_OP */
struct kvm_mmu_op_header {
	__u32 op;
	__u32 pad;
};

struct kvm_mmu_op_write_pte {
	struct kvm_mmu_op_header header;
	__u64 pte_phys;
	__u64 pte_val;
};

struct kvm_mmu_op_flush_tlb {
	struct kvm_mmu_op_header header;
};

struct kvm_mmu_op_release_pt {
	struct kvm_mmu_op_header header;
	__u64 pt_phys;
};

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

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)
		     : "memory");
	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)
		     : "memory");
	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)
		     : "memory");
	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)
		     : "memory");
	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)
		     : "memory");
	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 /* _ASM_X86_KVM_PARA_H */
Commit	Line	Data
1965aae3 PA	1	#ifndef _ASM_X86_KVM_PARA_H
1965aae3 PA	2	#define _ASM_X86_KVM_PARA_H
5f43238d	3
fa6870c6	4	#include <linux/types.h>
55cd8e5a	5	#include <asm/hyperv.h>
fa6870c6	6
5f43238d CB	7	/* This CPUID returns the signature 'KVMKVMKVM' in ebx, ecx, and edx. It
	8	* should be used to determine that a VM is running under KVM.
	9	*/
	10	#define KVM_CPUID_SIGNATURE 0x40000000
	11
	12	/* This CPUID returns a feature bitmap in eax. Before enabling a particular
	13	* paravirtualization, the appropriate feature bit should be checked.
	14	*/
	15	#define KVM_CPUID_FEATURES 0x40000001
a28e4f5a MT	16	#define KVM_FEATURE_CLOCKSOURCE 0
a28e4f5a MT	17	#define KVM_FEATURE_NOP_IO_DELAY 1
2f333bcb	18	#define KVM_FEATURE_MMU_OP 2
18068523 GOC	19
	20	#define MSR_KVM_WALL_CLOCK 0x11
	21	#define MSR_KVM_SYSTEM_TIME 0x12
5f43238d	22
2f333bcb MT	23	#define KVM_MAX_MMU_OP_BATCH 32
	24
	25	/* Operations for KVM_HC_MMU_OP */
	26	#define KVM_MMU_OP_WRITE_PTE 1
	27	#define KVM_MMU_OP_FLUSH_TLB 2
	28	#define KVM_MMU_OP_RELEASE_PT 3
	29
	30	/* Payload for KVM_HC_MMU_OP */
	31	struct kvm_mmu_op_header {
	32	__u32 op;
	33	__u32 pad;
	34	};
	35
	36	struct kvm_mmu_op_write_pte {
	37	struct kvm_mmu_op_header header;
	38	__u64 pte_phys;
	39	__u64 pte_val;
	40	};
	41
	42	struct kvm_mmu_op_flush_tlb {
	43	struct kvm_mmu_op_header header;
	44	};
	45
	46	struct kvm_mmu_op_release_pt {
	47	struct kvm_mmu_op_header header;
	48	__u64 pt_phys;
	49	};
	50
5f43238d CB	51	#ifdef __KERNEL__
	52	#include <asm/processor.h>
	53
18068523 GOC	54	extern void kvmclock_init(void);
	55
	56
5f43238d CB	57	/* This instruction is vmcall. On non-VT architectures, it will generate a
	58	* trap that we will then rewrite to the appropriate instruction.
	59	*/
	60	#define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1"
	61
	62	/* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun
	63	* instruction. The hypervisor may replace it with something else but only the
	64	* instructions are guaranteed to be supported.
	65	*
	66	* Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
	67	* The hypercall number should be placed in rax and the return value will be
	68	* placed in rax. No other registers will be clobbered unless explicited
	69	* noted by the particular hypercall.
	70	*/
	71
	72	static inline long kvm_hypercall0(unsigned int nr)
	73	{
	74	long ret;
	75	asm volatile(KVM_HYPERCALL
	76	: "=a"(ret)
ca373932 AL	77	: "a"(nr)
ca373932 AL	78	: "memory");
5f43238d CB	79	return ret;
	80	}
	81
	82	static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
	83	{
	84	long ret;
	85	asm volatile(KVM_HYPERCALL
	86	: "=a"(ret)
ca373932 AL	87	: "a"(nr), "b"(p1)
ca373932 AL	88	: "memory");
5f43238d CB	89	return ret;
	90	}
	91
	92	static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
	93	unsigned long p2)
	94	{
	95	long ret;
	96	asm volatile(KVM_HYPERCALL
	97	: "=a"(ret)
ca373932 AL	98	: "a"(nr), "b"(p1), "c"(p2)
ca373932 AL	99	: "memory");
5f43238d CB	100	return ret;
	101	}
	102
	103	static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
	104	unsigned long p2, unsigned long p3)
	105	{
	106	long ret;
	107	asm volatile(KVM_HYPERCALL
	108	: "=a"(ret)
ca373932 AL	109	: "a"(nr), "b"(p1), "c"(p2), "d"(p3)
ca373932 AL	110	: "memory");
5f43238d CB	111	return ret;
	112	}
	113
	114	static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
	115	unsigned long p2, unsigned long p3,
	116	unsigned long p4)
	117	{
	118	long ret;
	119	asm volatile(KVM_HYPERCALL
	120	: "=a"(ret)
ca373932 AL	121	: "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4)
ca373932 AL	122	: "memory");
5f43238d CB	123	return ret;
	124	}
	125
	126	static inline int kvm_para_available(void)
	127	{
	128	unsigned int eax, ebx, ecx, edx;
	129	char signature[13];
	130
	131	cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
	132	memcpy(signature + 0, &ebx, 4);
	133	memcpy(signature + 4, &ecx, 4);
	134	memcpy(signature + 8, &edx, 4);
	135	signature[12] = 0;
	136
	137	if (strcmp(signature, "KVMKVMKVM") == 0)
	138	return 1;
	139
	140	return 0;
	141	}
	142
	143	static inline unsigned int kvm_arch_para_features(void)
	144	{
	145	return cpuid_eax(KVM_CPUID_FEATURES);
	146	}
	147
	148	#endif
	149
1965aae3	150	#endif /* _ASM_X86_KVM_PARA_H */