/****************************************************************************** * vm_event.h * * Memory event common structures. * * Copyright (c) 2009 by Citrix Systems, Inc. (Patrick Colp) * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to * deal in the Software without restriction, including without limitation the * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or * sell copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. */ #ifndef _XEN_PUBLIC_VM_EVENT_H #define _XEN_PUBLIC_VM_EVENT_H #include "xen.h" #define VM_EVENT_INTERFACE_VERSION 0x00000001 #if defined(__XEN__) || defined(__XEN_TOOLS__) #include "io/ring.h" /* * Memory event flags */ /* * VCPU_PAUSED in a request signals that the vCPU triggering the event has been * paused * VCPU_PAUSED in a response signals to unpause the vCPU */ #define VM_EVENT_FLAG_VCPU_PAUSED (1 << 0) /* Flags to aid debugging vm_event */ #define VM_EVENT_FLAG_FOREIGN (1 << 1) /* * The following flags can be set in response to a mem_access event. * * Emulate the fault-causing instruction (if set in the event response flags). * This will allow the guest to continue execution without lifting the page * access restrictions. */ #define VM_EVENT_FLAG_EMULATE (1 << 2) /* * Same as VM_EVENT_FLAG_EMULATE, but with write operations or operations * potentially having side effects (like memory mapped or port I/O) disabled. */ #define VM_EVENT_FLAG_EMULATE_NOWRITE (1 << 3) /* * Toggle singlestepping on vm_event response. * Requires the vCPU to be paused already (synchronous events only). */ #define VM_EVENT_FLAG_TOGGLE_SINGLESTEP (1 << 4) /* * Data is being sent back to the hypervisor in the event response, to be * returned by the read function when emulating an instruction. * This flag is only useful when combined with VM_EVENT_FLAG_EMULATE * and takes precedence if combined with VM_EVENT_FLAG_EMULATE_NOWRITE * (i.e. if both VM_EVENT_FLAG_EMULATE_NOWRITE and * VM_EVENT_FLAG_SET_EMUL_READ_DATA are set, only the latter will be honored). */ #define VM_EVENT_FLAG_SET_EMUL_READ_DATA (1 << 5) /* * Deny completion of the operation that triggered the event. * Currently only useful for MSR, CR0, CR3 and CR4 write events. */ #define VM_EVENT_FLAG_DENY (1 << 6) /* * This flag can be set in a request or a response * * On a request, indicates that the event occurred in the alternate p2m specified by * the altp2m_idx request field. * * On a response, indicates that the VCPU should resume in the alternate p2m specified * by the altp2m_idx response field if possible. */ #define VM_EVENT_FLAG_ALTERNATE_P2M (1 << 7) /* * Reasons for the vm event request */ /* Default case */ #define VM_EVENT_REASON_UNKNOWN 0 /* Memory access violation */ #define VM_EVENT_REASON_MEM_ACCESS 1 /* Memory sharing event */ #define VM_EVENT_REASON_MEM_SHARING 2 /* Memory paging event */ #define VM_EVENT_REASON_MEM_PAGING 3 /* A control register was updated */ #define VM_EVENT_REASON_WRITE_CTRLREG 4 /* An MSR was updated. */ #define VM_EVENT_REASON_MOV_TO_MSR 5 /* Debug operation executed (e.g. int3) */ #define VM_EVENT_REASON_SOFTWARE_BREAKPOINT 6 /* Single-step (e.g. MTF) */ #define VM_EVENT_REASON_SINGLESTEP 7 /* An event has been requested via HVMOP_guest_request_vm_event. */ #define VM_EVENT_REASON_GUEST_REQUEST 8 /* Supported values for the vm_event_write_ctrlreg index. */ #define VM_EVENT_X86_CR0 0 #define VM_EVENT_X86_CR3 1 #define VM_EVENT_X86_CR4 2 #define VM_EVENT_X86_XCR0 3 /* * Using a custom struct (not hvm_hw_cpu) so as to not fill * the vm_event ring buffer too quickly. */ struct vm_event_regs_x86 { uint64_t rax; uint64_t rcx; uint64_t rdx; uint64_t rbx; uint64_t rsp; uint64_t rbp; uint64_t rsi; uint64_t rdi; uint64_t r8; uint64_t r9; uint64_t r10; uint64_t r11; uint64_t r12; uint64_t r13; uint64_t r14; uint64_t r15; uint64_t rflags; uint64_t dr7; uint64_t rip; uint64_t cr0; uint64_t cr2; uint64_t cr3; uint64_t cr4; uint64_t sysenter_cs; uint64_t sysenter_esp; uint64_t sysenter_eip; uint64_t msr_efer; uint64_t msr_star; uint64_t msr_lstar; uint64_t fs_base; uint64_t gs_base; uint32_t cs_arbytes; uint32_t _pad; }; /* * mem_access flag definitions * * These flags are set only as part of a mem_event request. * * R/W/X: Defines the type of violation that has triggered the event * Multiple types can be set in a single violation! * GLA_VALID: If the gla field holds a guest VA associated with the event * FAULT_WITH_GLA: If the violation was triggered by accessing gla * FAULT_IN_GPT: If the violation was triggered during translating gla */ #define MEM_ACCESS_R (1 << 0) #define MEM_ACCESS_W (1 << 1) #define MEM_ACCESS_X (1 << 2) #define MEM_ACCESS_RWX (MEM_ACCESS_R | MEM_ACCESS_W | MEM_ACCESS_X) #define MEM_ACCESS_RW (MEM_ACCESS_R | MEM_ACCESS_W) #define MEM_ACCESS_RX (MEM_ACCESS_R | MEM_ACCESS_X) #define MEM_ACCESS_WX (MEM_ACCESS_W | MEM_ACCESS_X) #define MEM_ACCESS_GLA_VALID (1 << 3) #define MEM_ACCESS_FAULT_WITH_GLA (1 << 4) #define MEM_ACCESS_FAULT_IN_GPT (1 << 5) struct vm_event_mem_access { uint64_t gfn; uint64_t offset; uint64_t gla; /* if flags has MEM_ACCESS_GLA_VALID set */ uint32_t flags; /* MEM_ACCESS_* */ uint32_t _pad; }; struct vm_event_write_ctrlreg { uint32_t index; uint32_t _pad; uint64_t new_value; uint64_t old_value; }; struct vm_event_debug { uint64_t gfn; }; struct vm_event_mov_to_msr { uint64_t msr; uint64_t value; }; #define MEM_PAGING_DROP_PAGE (1 << 0) #define MEM_PAGING_EVICT_FAIL (1 << 1) struct vm_event_paging { uint64_t gfn; uint32_t p2mt; uint32_t flags; }; struct vm_event_sharing { uint64_t gfn; uint32_t p2mt; uint32_t _pad; }; struct vm_event_emul_read_data { uint32_t size; /* The struct is used in a union with vm_event_regs_x86. */ uint8_t data[sizeof(struct vm_event_regs_x86) - sizeof(uint32_t)]; }; typedef struct vm_event_st { uint32_t version; /* VM_EVENT_INTERFACE_VERSION */ uint32_t flags; /* VM_EVENT_FLAG_* */ uint32_t reason; /* VM_EVENT_REASON_* */ uint32_t vcpu_id; uint16_t altp2m_idx; /* may be used during request and response */ uint16_t _pad[3]; union { struct vm_event_paging mem_paging; struct vm_event_sharing mem_sharing; struct vm_event_mem_access mem_access; struct vm_event_write_ctrlreg write_ctrlreg; struct vm_event_mov_to_msr mov_to_msr; struct vm_event_debug software_breakpoint; struct vm_event_debug singlestep; } u; union { union { struct vm_event_regs_x86 x86; } regs; struct vm_event_emul_read_data emul_read_data; } data; } vm_event_request_t, vm_event_response_t; DEFINE_RING_TYPES(vm_event, vm_event_request_t, vm_event_response_t); #endif /* defined(__XEN__) || defined(__XEN_TOOLS__) */ #endif /* _XEN_PUBLIC_VM_EVENT_H */ /* * Local variables: * mode: C * c-file-style: "BSD" * c-basic-offset: 4 * tab-width: 4 * indent-tabs-mode: nil * End: */