[mirror_ubuntu-jammy-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

/* Custom MSRs falls in the range 0x4b564d00-0x4b564dff */
#define MSR_KVM_WALL_CLOCK_NEW  0x4b564d00
#define MSR_KVM_SYSTEM_TIME_NEW 0x4b564d01

#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
11c6bffa GC	23	/* Custom MSRs falls in the range 0x4b564d00-0x4b564dff */
	24	#define MSR_KVM_WALL_CLOCK_NEW 0x4b564d00
	25	#define MSR_KVM_SYSTEM_TIME_NEW 0x4b564d01
	26
2f333bcb MT	27	#define KVM_MAX_MMU_OP_BATCH 32
	28
	29	/* Operations for KVM_HC_MMU_OP */
	30	#define KVM_MMU_OP_WRITE_PTE 1
	31	#define KVM_MMU_OP_FLUSH_TLB 2
	32	#define KVM_MMU_OP_RELEASE_PT 3
	33
	34	/* Payload for KVM_HC_MMU_OP */
	35	struct kvm_mmu_op_header {
	36	__u32 op;
	37	__u32 pad;
	38	};
	39
	40	struct kvm_mmu_op_write_pte {
	41	struct kvm_mmu_op_header header;
	42	__u64 pte_phys;
	43	__u64 pte_val;
	44	};
	45
	46	struct kvm_mmu_op_flush_tlb {
	47	struct kvm_mmu_op_header header;
	48	};
	49
	50	struct kvm_mmu_op_release_pt {
	51	struct kvm_mmu_op_header header;
	52	__u64 pt_phys;
	53	};
	54
5f43238d CB	55	#ifdef __KERNEL__
	56	#include <asm/processor.h>
	57
18068523 GOC	58	extern void kvmclock_init(void);
	59
	60
5f43238d CB	61	/* This instruction is vmcall. On non-VT architectures, it will generate a
	62	* trap that we will then rewrite to the appropriate instruction.
	63	*/
	64	#define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1"
	65
	66	/* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun
	67	* instruction. The hypervisor may replace it with something else but only the
	68	* instructions are guaranteed to be supported.
	69	*
	70	* Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
	71	* The hypercall number should be placed in rax and the return value will be
	72	* placed in rax. No other registers will be clobbered unless explicited
	73	* noted by the particular hypercall.
	74	*/
	75
	76	static inline long kvm_hypercall0(unsigned int nr)
	77	{
	78	long ret;
	79	asm volatile(KVM_HYPERCALL
	80	: "=a"(ret)
ca373932 AL	81	: "a"(nr)
ca373932 AL	82	: "memory");
5f43238d CB	83	return ret;
	84	}
	85
	86	static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
	87	{
	88	long ret;
	89	asm volatile(KVM_HYPERCALL
	90	: "=a"(ret)
ca373932 AL	91	: "a"(nr), "b"(p1)
ca373932 AL	92	: "memory");
5f43238d CB	93	return ret;
	94	}
	95
	96	static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
	97	unsigned long p2)
	98	{
	99	long ret;
	100	asm volatile(KVM_HYPERCALL
	101	: "=a"(ret)
ca373932 AL	102	: "a"(nr), "b"(p1), "c"(p2)
ca373932 AL	103	: "memory");
5f43238d CB	104	return ret;
	105	}
	106
	107	static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
	108	unsigned long p2, unsigned long p3)
	109	{
	110	long ret;
	111	asm volatile(KVM_HYPERCALL
	112	: "=a"(ret)
ca373932 AL	113	: "a"(nr), "b"(p1), "c"(p2), "d"(p3)
ca373932 AL	114	: "memory");
5f43238d CB	115	return ret;
	116	}
	117
	118	static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
	119	unsigned long p2, unsigned long p3,
	120	unsigned long p4)
	121	{
	122	long ret;
	123	asm volatile(KVM_HYPERCALL
	124	: "=a"(ret)
ca373932 AL	125	: "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4)
ca373932 AL	126	: "memory");
5f43238d CB	127	return ret;
	128	}
	129
	130	static inline int kvm_para_available(void)
	131	{
	132	unsigned int eax, ebx, ecx, edx;
	133	char signature[13];
	134
	135	cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
	136	memcpy(signature + 0, &ebx, 4);
	137	memcpy(signature + 4, &ecx, 4);
	138	memcpy(signature + 8, &edx, 4);
	139	signature[12] = 0;
	140
	141	if (strcmp(signature, "KVMKVMKVM") == 0)
	142	return 1;
	143
	144	return 0;
	145	}
	146
	147	static inline unsigned int kvm_arch_para_features(void)
	148	{
	149	return cpuid_eax(KVM_CPUID_FEATURES);
	150	}
	151
	152	#endif
	153
1965aae3	154	#endif /* _ASM_X86_KVM_PARA_H */