1e08cae41SH. Peter Anvin #ifndef _ASM_X86_MSHYPER_H 2e08cae41SH. Peter Anvin #define _ASM_X86_MSHYPER_H 3a2a47c6cSKy Srinivasan 4e08cae41SH. Peter Anvin #include <linux/types.h> 51aec1696SThomas Gleixner #include <linux/interrupt.h> 6e08cae41SH. Peter Anvin #include <asm/hyperv.h> 7e08cae41SH. Peter Anvin 88de8af7eSK. Y. Srinivasan /* 98de8af7eSK. Y. Srinivasan * The below CPUID leaves are present if VersionAndFeatures.HypervisorPresent 108de8af7eSK. Y. Srinivasan * is set by CPUID(HVCPUID_VERSION_FEATURES). 118de8af7eSK. Y. Srinivasan */ 128de8af7eSK. Y. Srinivasan enum hv_cpuid_function { 138de8af7eSK. Y. Srinivasan HVCPUID_VERSION_FEATURES = 0x00000001, 148de8af7eSK. Y. Srinivasan HVCPUID_VENDOR_MAXFUNCTION = 0x40000000, 158de8af7eSK. Y. Srinivasan HVCPUID_INTERFACE = 0x40000001, 168de8af7eSK. Y. Srinivasan 178de8af7eSK. Y. Srinivasan /* 188de8af7eSK. Y. Srinivasan * The remaining functions depend on the value of 198de8af7eSK. Y. Srinivasan * HVCPUID_INTERFACE 208de8af7eSK. Y. Srinivasan */ 218de8af7eSK. Y. Srinivasan HVCPUID_VERSION = 0x40000002, 228de8af7eSK. Y. Srinivasan HVCPUID_FEATURES = 0x40000003, 238de8af7eSK. Y. Srinivasan HVCPUID_ENLIGHTENMENT_INFO = 0x40000004, 248de8af7eSK. Y. Srinivasan HVCPUID_IMPLEMENTATION_LIMITS = 0x40000005, 258de8af7eSK. Y. Srinivasan }; 268de8af7eSK. Y. Srinivasan 27e08cae41SH. Peter Anvin struct ms_hyperv_info { 28e08cae41SH. Peter Anvin u32 features; 29cc2dd402SDenis V. Lunev u32 misc_features; 30e08cae41SH. Peter Anvin u32 hints; 31e08cae41SH. Peter Anvin }; 32e08cae41SH. Peter Anvin 33e08cae41SH. Peter Anvin extern struct ms_hyperv_info ms_hyperv; 34a2a47c6cSKy Srinivasan 353f646ed7SK. Y. Srinivasan /* 363f646ed7SK. Y. Srinivasan * Declare the MSR used to setup pages used to communicate with the hypervisor. 373f646ed7SK. Y. Srinivasan */ 383f646ed7SK. Y. Srinivasan union hv_x64_msr_hypercall_contents { 393f646ed7SK. Y. Srinivasan u64 as_uint64; 403f646ed7SK. Y. Srinivasan struct { 413f646ed7SK. Y. Srinivasan u64 enable:1; 423f646ed7SK. Y. Srinivasan u64 reserved:11; 433f646ed7SK. Y. Srinivasan u64 guest_physical_address:52; 443f646ed7SK. Y. Srinivasan }; 453f646ed7SK. Y. Srinivasan }; 463f646ed7SK. Y. Srinivasan 47352c9624SK. Y. Srinivasan /* 4863ed4e0cSK. Y. Srinivasan * TSC page layout. 4963ed4e0cSK. Y. Srinivasan */ 5063ed4e0cSK. Y. Srinivasan 5163ed4e0cSK. Y. Srinivasan struct ms_hyperv_tsc_page { 5263ed4e0cSK. Y. Srinivasan volatile u32 tsc_sequence; 5363ed4e0cSK. Y. Srinivasan u32 reserved1; 5463ed4e0cSK. Y. Srinivasan volatile u64 tsc_scale; 5563ed4e0cSK. Y. Srinivasan volatile s64 tsc_offset; 5663ed4e0cSK. Y. Srinivasan u64 reserved2[509]; 5763ed4e0cSK. Y. Srinivasan }; 5863ed4e0cSK. Y. Srinivasan 5963ed4e0cSK. Y. Srinivasan /* 60352c9624SK. Y. Srinivasan * The guest OS needs to register the guest ID with the hypervisor. 61352c9624SK. Y. Srinivasan * The guest ID is a 64 bit entity and the structure of this ID is 62352c9624SK. Y. Srinivasan * specified in the Hyper-V specification: 63352c9624SK. Y. Srinivasan * 64352c9624SK. Y. Srinivasan * msdn.microsoft.com/en-us/library/windows/hardware/ff542653%28v=vs.85%29.aspx 65352c9624SK. Y. Srinivasan * 66352c9624SK. Y. Srinivasan * While the current guideline does not specify how Linux guest ID(s) 67352c9624SK. Y. Srinivasan * need to be generated, our plan is to publish the guidelines for 68352c9624SK. Y. Srinivasan * Linux and other guest operating systems that currently are hosted 69352c9624SK. Y. Srinivasan * on Hyper-V. The implementation here conforms to this yet 70352c9624SK. Y. Srinivasan * unpublished guidelines. 71352c9624SK. Y. Srinivasan * 72352c9624SK. Y. Srinivasan * 73352c9624SK. Y. Srinivasan * Bit(s) 74352c9624SK. Y. Srinivasan * 63 - Indicates if the OS is Open Source or not; 1 is Open Source 75352c9624SK. Y. Srinivasan * 62:56 - Os Type; Linux is 0x100 76352c9624SK. Y. Srinivasan * 55:48 - Distro specific identification 77352c9624SK. Y. Srinivasan * 47:16 - Linux kernel version number 78352c9624SK. Y. Srinivasan * 15:0 - Distro specific identification 79352c9624SK. Y. Srinivasan * 80352c9624SK. Y. Srinivasan * 81352c9624SK. Y. Srinivasan */ 82352c9624SK. Y. Srinivasan 83352c9624SK. Y. Srinivasan #define HV_LINUX_VENDOR_ID 0x8800 84352c9624SK. Y. Srinivasan 85352c9624SK. Y. Srinivasan /* 86352c9624SK. Y. Srinivasan * Generate the guest ID based on the guideline described above. 87352c9624SK. Y. Srinivasan */ 88352c9624SK. Y. Srinivasan 89352c9624SK. Y. Srinivasan static inline __u64 generate_guest_id(__u64 d_info1, __u64 kernel_version, 90352c9624SK. Y. Srinivasan __u64 d_info2) 91352c9624SK. Y. Srinivasan { 92352c9624SK. Y. Srinivasan __u64 guest_id = 0; 93352c9624SK. Y. Srinivasan 94352c9624SK. Y. Srinivasan guest_id = (((__u64)HV_LINUX_VENDOR_ID) << 56); 95352c9624SK. Y. Srinivasan guest_id |= (d_info1 << 48); 96352c9624SK. Y. Srinivasan guest_id |= (kernel_version << 16); 97352c9624SK. Y. Srinivasan guest_id |= d_info2; 98352c9624SK. Y. Srinivasan 99352c9624SK. Y. Srinivasan return guest_id; 100352c9624SK. Y. Srinivasan } 101352c9624SK. Y. Srinivasan 102*e810e48cSK. Y. Srinivasan 103*e810e48cSK. Y. Srinivasan /* Free the message slot and signal end-of-message if required */ 104*e810e48cSK. Y. Srinivasan static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type) 105*e810e48cSK. Y. Srinivasan { 106*e810e48cSK. Y. Srinivasan /* 107*e810e48cSK. Y. Srinivasan * On crash we're reading some other CPU's message page and we need 108*e810e48cSK. Y. Srinivasan * to be careful: this other CPU may already had cleared the header 109*e810e48cSK. Y. Srinivasan * and the host may already had delivered some other message there. 110*e810e48cSK. Y. Srinivasan * In case we blindly write msg->header.message_type we're going 111*e810e48cSK. Y. Srinivasan * to lose it. We can still lose a message of the same type but 112*e810e48cSK. Y. Srinivasan * we count on the fact that there can only be one 113*e810e48cSK. Y. Srinivasan * CHANNELMSG_UNLOAD_RESPONSE and we don't care about other messages 114*e810e48cSK. Y. Srinivasan * on crash. 115*e810e48cSK. Y. Srinivasan */ 116*e810e48cSK. Y. Srinivasan if (cmpxchg(&msg->header.message_type, old_msg_type, 117*e810e48cSK. Y. Srinivasan HVMSG_NONE) != old_msg_type) 118*e810e48cSK. Y. Srinivasan return; 119*e810e48cSK. Y. Srinivasan 120*e810e48cSK. Y. Srinivasan /* 121*e810e48cSK. Y. Srinivasan * Make sure the write to MessageType (ie set to 122*e810e48cSK. Y. Srinivasan * HVMSG_NONE) happens before we read the 123*e810e48cSK. Y. Srinivasan * MessagePending and EOMing. Otherwise, the EOMing 124*e810e48cSK. Y. Srinivasan * will not deliver any more messages since there is 125*e810e48cSK. Y. Srinivasan * no empty slot 126*e810e48cSK. Y. Srinivasan */ 127*e810e48cSK. Y. Srinivasan mb(); 128*e810e48cSK. Y. Srinivasan 129*e810e48cSK. Y. Srinivasan if (msg->header.message_flags.msg_pending) { 130*e810e48cSK. Y. Srinivasan /* 131*e810e48cSK. Y. Srinivasan * This will cause message queue rescan to 132*e810e48cSK. Y. Srinivasan * possibly deliver another msg from the 133*e810e48cSK. Y. Srinivasan * hypervisor 134*e810e48cSK. Y. Srinivasan */ 135*e810e48cSK. Y. Srinivasan wrmsrl(HV_X64_MSR_EOM, 0); 136*e810e48cSK. Y. Srinivasan } 137*e810e48cSK. Y. Srinivasan } 138*e810e48cSK. Y. Srinivasan 139bc2b0331SK. Y. Srinivasan void hyperv_callback_vector(void); 140cf910e83SSeiji Aguchi #ifdef CONFIG_TRACING 141cf910e83SSeiji Aguchi #define trace_hyperv_callback_vector hyperv_callback_vector 142cf910e83SSeiji Aguchi #endif 143bc2b0331SK. Y. Srinivasan void hyperv_vector_handler(struct pt_regs *regs); 14476d388cdSThomas Gleixner void hv_setup_vmbus_irq(void (*handler)(void)); 14576d388cdSThomas Gleixner void hv_remove_vmbus_irq(void); 146bc2b0331SK. Y. Srinivasan 1472517281dSVitaly Kuznetsov void hv_setup_kexec_handler(void (*handler)(void)); 1482517281dSVitaly Kuznetsov void hv_remove_kexec_handler(void); 149b4370df2SVitaly Kuznetsov void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs)); 150b4370df2SVitaly Kuznetsov void hv_remove_crash_handler(void); 1518730046cSK. Y. Srinivasan 1528730046cSK. Y. Srinivasan #if IS_ENABLED(CONFIG_HYPERV) 1538730046cSK. Y. Srinivasan void hyperv_init(void); 154d058fa7eSK. Y. Srinivasan void hyperv_report_panic(struct pt_regs *regs); 15573638cddSK. Y. Srinivasan bool hv_is_hypercall_page_setup(void); 1568730046cSK. Y. Srinivasan #endif 157a2a47c6cSKy Srinivasan #endif 158