kvm_para.h

  1/* SPDX-License-Identifier: GPL-2.0 */
  2#ifndef _ASM_LOONGARCH_KVM_PARA_H
  3#define _ASM_LOONGARCH_KVM_PARA_H
  4
  5#include <uapi/asm/kvm_para.h>
  6
  7/*
  8 * Hypercall code field
  9 */
 10#define HYPERVISOR_KVM			1
 11#define HYPERVISOR_VENDOR_SHIFT		8
 12#define HYPERCALL_ENCODE(vendor, code)	((vendor << HYPERVISOR_VENDOR_SHIFT) + code)
 13
 14#define KVM_HCALL_CODE_SERVICE		0
 15#define KVM_HCALL_CODE_SWDBG		1
 16#define KVM_HCALL_CODE_USER_SERVICE	2
 17
 18#define KVM_HCALL_SERVICE		HYPERCALL_ENCODE(HYPERVISOR_KVM, KVM_HCALL_CODE_SERVICE)
 19#define  KVM_HCALL_FUNC_IPI		1
 20#define  KVM_HCALL_FUNC_NOTIFY		2
 21
 22#define KVM_HCALL_SWDBG			HYPERCALL_ENCODE(HYPERVISOR_KVM, KVM_HCALL_CODE_SWDBG)
 23
 24#define KVM_HCALL_USER_SERVICE		HYPERCALL_ENCODE(HYPERVISOR_KVM, KVM_HCALL_CODE_USER_SERVICE)
 25
 26/*
 27 * LoongArch hypercall return code
 28 */
 29#define KVM_HCALL_SUCCESS		0
 30#define KVM_HCALL_INVALID_CODE		-1UL
 31#define KVM_HCALL_INVALID_PARAMETER	-2UL
 32
 33#define KVM_STEAL_PHYS_VALID		BIT_ULL(0)
 34#define KVM_STEAL_PHYS_MASK		GENMASK_ULL(63, 6)
 35
 36struct kvm_steal_time {
 37	__u64 steal;
 38	__u32 version;
 39	__u32 flags;
 40	__u32 pad[12];
 41};
 42
 43/*
 44 * Hypercall interface for KVM hypervisor
 45 *
 46 * a0: function identifier
 47 * a1-a5: args
 48 * Return value will be placed in a0.
 49 * Up to 5 arguments are passed in a1, a2, a3, a4, a5.
 50 */
 51static __always_inline long kvm_hypercall0(u64 fid)
 52{
 53	register long ret asm("a0");
 54	register unsigned long fun asm("a0") = fid;
 55
 56	__asm__ __volatile__(
 57		"hvcl "__stringify(KVM_HCALL_SERVICE)
 58		: "=r" (ret)
 59		: "r" (fun)
 60		: "memory"
 61		);
 62
 63	return ret;
 64}
 65
 66static __always_inline long kvm_hypercall1(u64 fid, unsigned long arg0)
 67{
 68	register long ret asm("a0");
 69	register unsigned long fun asm("a0") = fid;
 70	register unsigned long a1  asm("a1") = arg0;
 71
 72	__asm__ __volatile__(
 73		"hvcl "__stringify(KVM_HCALL_SERVICE)
 74		: "=r" (ret)
 75		: "r" (fun), "r" (a1)
 76		: "memory"
 77		);
 78
 79	return ret;
 80}
 81
 82static __always_inline long kvm_hypercall2(u64 fid,
 83		unsigned long arg0, unsigned long arg1)
 84{
 85	register long ret asm("a0");
 86	register unsigned long fun asm("a0") = fid;
 87	register unsigned long a1  asm("a1") = arg0;
 88	register unsigned long a2  asm("a2") = arg1;
 89
 90	__asm__ __volatile__(
 91		"hvcl "__stringify(KVM_HCALL_SERVICE)
 92		: "=r" (ret)
 93		: "r" (fun), "r" (a1), "r" (a2)
 94		: "memory"
 95		);
 96
 97	return ret;
 98}
 99
100static __always_inline long kvm_hypercall3(u64 fid,
101	unsigned long arg0, unsigned long arg1, unsigned long arg2)
102{
103	register long ret asm("a0");
104	register unsigned long fun asm("a0") = fid;
105	register unsigned long a1  asm("a1") = arg0;
106	register unsigned long a2  asm("a2") = arg1;
107	register unsigned long a3  asm("a3") = arg2;
108
109	__asm__ __volatile__(
110		"hvcl "__stringify(KVM_HCALL_SERVICE)
111		: "=r" (ret)
112		: "r" (fun), "r" (a1), "r" (a2), "r" (a3)
113		: "memory"
114		);
115
116	return ret;
117}
118
119static __always_inline long kvm_hypercall4(u64 fid,
120		unsigned long arg0, unsigned long arg1,
121		unsigned long arg2, unsigned long arg3)
122{
123	register long ret asm("a0");
124	register unsigned long fun asm("a0") = fid;
125	register unsigned long a1  asm("a1") = arg0;
126	register unsigned long a2  asm("a2") = arg1;
127	register unsigned long a3  asm("a3") = arg2;
128	register unsigned long a4  asm("a4") = arg3;
129
130	__asm__ __volatile__(
131		"hvcl "__stringify(KVM_HCALL_SERVICE)
132		: "=r" (ret)
133		: "r"(fun), "r" (a1), "r" (a2), "r" (a3), "r" (a4)
134		: "memory"
135		);
136
137	return ret;
138}
139
140static __always_inline long kvm_hypercall5(u64 fid,
141		unsigned long arg0, unsigned long arg1,
142		unsigned long arg2, unsigned long arg3, unsigned long arg4)
143{
144	register long ret asm("a0");
145	register unsigned long fun asm("a0") = fid;
146	register unsigned long a1  asm("a1") = arg0;
147	register unsigned long a2  asm("a2") = arg1;
148	register unsigned long a3  asm("a3") = arg2;
149	register unsigned long a4  asm("a4") = arg3;
150	register unsigned long a5  asm("a5") = arg4;
151
152	__asm__ __volatile__(
153		"hvcl "__stringify(KVM_HCALL_SERVICE)
154		: "=r" (ret)
155		: "r"(fun), "r" (a1), "r" (a2), "r" (a3), "r" (a4), "r" (a5)
156		: "memory"
157		);
158
159	return ret;
160}
161
162#ifdef CONFIG_PARAVIRT
163bool kvm_para_available(void);
164unsigned int kvm_arch_para_features(void);
165#else
166static inline bool kvm_para_available(void)
167{
168	return false;
169}
170
171static inline unsigned int kvm_arch_para_features(void)
172{
173	return 0;
174}
175#endif
176
177static inline unsigned int kvm_arch_para_hints(void)
178{
179	return 0;
180}
181
182static inline bool kvm_check_and_clear_guest_paused(void)
183{
184	return false;
185}
186
187#endif /* _ASM_LOONGARCH_KVM_PARA_H */