1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright © 2019 Oracle and/or its affiliates. All rights reserved. 4 * Copyright © 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved. 5 * 6 * KVM Xen emulation 7 */ 8 9 #ifndef __ARCH_X86_KVM_XEN_H__ 10 #define __ARCH_X86_KVM_XEN_H__ 11 12 #ifdef CONFIG_KVM_XEN 13 #include <linux/jump_label_ratelimit.h> 14 15 extern struct static_key_false_deferred kvm_xen_enabled; 16 17 int __kvm_xen_has_interrupt(struct kvm_vcpu *vcpu); 18 int kvm_xen_vcpu_set_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data); 19 int kvm_xen_vcpu_get_attr(struct kvm_vcpu *vcpu, struct kvm_xen_vcpu_attr *data); 20 int kvm_xen_hvm_set_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data); 21 int kvm_xen_hvm_get_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data); 22 int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data); 23 int kvm_xen_hvm_config(struct kvm *kvm, struct kvm_xen_hvm_config *xhc); 24 void kvm_xen_init_vm(struct kvm *kvm); 25 void kvm_xen_destroy_vm(struct kvm *kvm); 26 27 int kvm_xen_set_evtchn_fast(struct kvm_kernel_irq_routing_entry *e, 28 struct kvm *kvm); 29 int kvm_xen_setup_evtchn(struct kvm *kvm, 30 struct kvm_kernel_irq_routing_entry *e, 31 const struct kvm_irq_routing_entry *ue); 32 33 static inline bool kvm_xen_msr_enabled(struct kvm *kvm) 34 { 35 return static_branch_unlikely(&kvm_xen_enabled.key) && 36 kvm->arch.xen_hvm_config.msr; 37 } 38 39 static inline bool kvm_xen_hypercall_enabled(struct kvm *kvm) 40 { 41 return static_branch_unlikely(&kvm_xen_enabled.key) && 42 (kvm->arch.xen_hvm_config.flags & 43 KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL); 44 } 45 46 static inline int kvm_xen_has_interrupt(struct kvm_vcpu *vcpu) 47 { 48 if (static_branch_unlikely(&kvm_xen_enabled.key) && 49 vcpu->arch.xen.vcpu_info_set && vcpu->kvm->arch.xen.upcall_vector) 50 return __kvm_xen_has_interrupt(vcpu); 51 52 return 0; 53 } 54 #else 55 static inline int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data) 56 { 57 return 1; 58 } 59 60 static inline void kvm_xen_init_vm(struct kvm *kvm) 61 { 62 } 63 64 static inline void kvm_xen_destroy_vm(struct kvm *kvm) 65 { 66 } 67 68 static inline bool kvm_xen_msr_enabled(struct kvm *kvm) 69 { 70 return false; 71 } 72 73 static inline bool kvm_xen_hypercall_enabled(struct kvm *kvm) 74 { 75 return false; 76 } 77 78 static inline int kvm_xen_has_interrupt(struct kvm_vcpu *vcpu) 79 { 80 return 0; 81 } 82 #endif 83 84 int kvm_xen_hypercall(struct kvm_vcpu *vcpu); 85 86 #include <asm/pvclock-abi.h> 87 #include <asm/xen/interface.h> 88 #include <xen/interface/vcpu.h> 89 90 void kvm_xen_update_runstate_guest(struct kvm_vcpu *vcpu, int state); 91 92 static inline void kvm_xen_runstate_set_running(struct kvm_vcpu *vcpu) 93 { 94 kvm_xen_update_runstate_guest(vcpu, RUNSTATE_running); 95 } 96 97 static inline void kvm_xen_runstate_set_preempted(struct kvm_vcpu *vcpu) 98 { 99 /* 100 * If the vCPU wasn't preempted but took a normal exit for 101 * some reason (hypercalls, I/O, etc.), that is accounted as 102 * still RUNSTATE_running, as the VMM is still operating on 103 * behalf of the vCPU. Only if the VMM does actually block 104 * does it need to enter RUNSTATE_blocked. 105 */ 106 if (vcpu->preempted) 107 kvm_xen_update_runstate_guest(vcpu, RUNSTATE_runnable); 108 } 109 110 /* 32-bit compatibility definitions, also used natively in 32-bit build */ 111 struct compat_arch_vcpu_info { 112 unsigned int cr2; 113 unsigned int pad[5]; 114 }; 115 116 struct compat_vcpu_info { 117 uint8_t evtchn_upcall_pending; 118 uint8_t evtchn_upcall_mask; 119 uint16_t pad; 120 uint32_t evtchn_pending_sel; 121 struct compat_arch_vcpu_info arch; 122 struct pvclock_vcpu_time_info time; 123 }; /* 64 bytes (x86) */ 124 125 struct compat_arch_shared_info { 126 unsigned int max_pfn; 127 unsigned int pfn_to_mfn_frame_list_list; 128 unsigned int nmi_reason; 129 unsigned int p2m_cr3; 130 unsigned int p2m_vaddr; 131 unsigned int p2m_generation; 132 uint32_t wc_sec_hi; 133 }; 134 135 struct compat_shared_info { 136 struct compat_vcpu_info vcpu_info[MAX_VIRT_CPUS]; 137 uint32_t evtchn_pending[32]; 138 uint32_t evtchn_mask[32]; 139 struct pvclock_wall_clock wc; 140 struct compat_arch_shared_info arch; 141 }; 142 143 #define COMPAT_EVTCHN_2L_NR_CHANNELS (8 * \ 144 sizeof_field(struct compat_shared_info, \ 145 evtchn_pending)) 146 struct compat_vcpu_runstate_info { 147 int state; 148 uint64_t state_entry_time; 149 uint64_t time[4]; 150 } __attribute__((packed)); 151 152 #endif /* __ARCH_X86_KVM_XEN_H__ */ 153