/****************************************************************************** * arch-x86_32.h * * Guest OS interface to x86 Xen. * * 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. * * Copyright (c) 2004-2006, K A Fraser */ #ifndef _ASM_X86_XEN_INTERFACE_H #define _ASM_X86_XEN_INTERFACE_H /* * XEN_GUEST_HANDLE represents a guest pointer, when passed as a field * in a struct in memory. * XEN_GUEST_HANDLE_PARAM represent a guest pointer, when passed as an * hypercall argument. * XEN_GUEST_HANDLE_PARAM and XEN_GUEST_HANDLE are the same on X86 but * they might not be on other architectures. */ #ifdef __XEN__ #define __DEFINE_GUEST_HANDLE … #else #define __DEFINE_GUEST_HANDLE(name, type) … #endif #define DEFINE_GUEST_HANDLE_STRUCT(name) … #define DEFINE_GUEST_HANDLE(name) … #define GUEST_HANDLE(name) … #ifdef __XEN__ #if defined(__i386__) #define set_xen_guest_handle … #elif defined(__x86_64__) #define set_xen_guest_handle … #endif #else #if defined(__i386__) #define set_xen_guest_handle … #elif defined(__x86_64__) #define set_xen_guest_handle(hnd, val) … #endif #endif #ifndef __ASSEMBLY__ /* Explicitly size integers that represent pfns in the public interface * with Xen so that on ARM we can have one ABI that works for 32 and 64 * bit guests. */ typedef unsigned long xen_pfn_t; #define PRI_xen_pfn … typedef unsigned long xen_ulong_t; #define PRI_xen_ulong … typedef long xen_long_t; #define PRI_xen_long … /* Guest handles for primitive C types. */ __DEFINE_GUEST_HANDLE(uchar, unsigned char); __DEFINE_GUEST_HANDLE(uint, unsigned int); DEFINE_GUEST_HANDLE(char); DEFINE_GUEST_HANDLE(int); DEFINE_GUEST_HANDLE(void); DEFINE_GUEST_HANDLE(uint64_t); DEFINE_GUEST_HANDLE(uint32_t); DEFINE_GUEST_HANDLE(xen_pfn_t); DEFINE_GUEST_HANDLE(xen_ulong_t); #endif #ifndef HYPERVISOR_VIRT_START #define HYPERVISOR_VIRT_START … #endif #define MACH2PHYS_VIRT_START … #define MACH2PHYS_VIRT_END … #define MACH2PHYS_NR_ENTRIES … /* Maximum number of virtual CPUs in multi-processor guests. */ #define MAX_VIRT_CPUS … /* * SEGMENT DESCRIPTOR TABLES */ /* * A number of GDT entries are reserved by Xen. These are not situated at the * start of the GDT because some stupid OSes export hard-coded selector values * in their ABI. These hard-coded values are always near the start of the GDT, * so Xen places itself out of the way, at the far end of the GDT. * * NB The LDT is set using the MMUEXT_SET_LDT op of HYPERVISOR_mmuext_op */ #define FIRST_RESERVED_GDT_PAGE … #define FIRST_RESERVED_GDT_BYTE … #define FIRST_RESERVED_GDT_ENTRY … /* * Send an array of these to HYPERVISOR_set_trap_table(). * Terminate the array with a sentinel entry, with traps[].address==0. * The privilege level specifies which modes may enter a trap via a software * interrupt. On x86/64, since rings 1 and 2 are unavailable, we allocate * privilege levels as follows: * Level == 0: No one may enter * Level == 1: Kernel may enter * Level == 2: Kernel may enter * Level == 3: Everyone may enter */ #define TI_GET_DPL(_ti) … #define TI_GET_IF(_ti) … #define TI_SET_DPL(_ti, _dpl) … #define TI_SET_IF(_ti, _if) … #ifndef __ASSEMBLY__ struct trap_info { uint8_t vector; /* exception vector */ uint8_t flags; /* 0-3: privilege level; 4: clear event enable? */ uint16_t cs; /* code selector */ unsigned long address; /* code offset */ }; DEFINE_GUEST_HANDLE_STRUCT(trap_info); struct arch_shared_info { /* * Number of valid entries in the p2m table(s) anchored at * pfn_to_mfn_frame_list_list and/or p2m_vaddr. */ unsigned long max_pfn; /* * Frame containing list of mfns containing list of mfns containing p2m. * A value of 0 indicates it has not yet been set up, ~0 indicates it * has been set to invalid e.g. due to the p2m being too large for the * 3-level p2m tree. In this case the linear mapper p2m list anchored * at p2m_vaddr is to be used. */ xen_pfn_t pfn_to_mfn_frame_list_list; unsigned long nmi_reason; /* * Following three fields are valid if p2m_cr3 contains a value * different from 0. * p2m_cr3 is the root of the address space where p2m_vaddr is valid. * p2m_cr3 is in the same format as a cr3 value in the vcpu register * state and holds the folded machine frame number (via xen_pfn_to_cr3) * of a L3 or L4 page table. * p2m_vaddr holds the virtual address of the linear p2m list. All * entries in the range [0...max_pfn[ are accessible via this pointer. * p2m_generation will be incremented by the guest before and after each * change of the mappings of the p2m list. p2m_generation starts at 0 * and a value with the least significant bit set indicates that a * mapping update is in progress. This allows guest external software * (e.g. in Dom0) to verify that read mappings are consistent and * whether they have changed since the last check. * Modifying a p2m element in the linear p2m list is allowed via an * atomic write only. */ unsigned long p2m_cr3; /* cr3 value of the p2m address space */ unsigned long p2m_vaddr; /* virtual address of the p2m list */ unsigned long p2m_generation; /* generation count of p2m mapping */ #ifdef CONFIG_X86_32 uint32_t wc_sec_hi; #endif }; #endif /* !__ASSEMBLY__ */ #ifdef CONFIG_X86_32 #include <asm/xen/interface_32.h> #else #include <asm/xen/interface_64.h> #endif #include <asm/pvclock-abi.h> #ifndef __ASSEMBLY__ /* * The following is all CPU context. Note that the fpu_ctxt block is filled * in by FXSAVE if the CPU has feature FXSR; otherwise FSAVE is used. * * Also note that when calling DOMCTL_setvcpucontext and VCPU_initialise * for HVM and PVH guests, not all information in this structure is updated: * * - For HVM guests, the structures read include: fpu_ctxt (if * VGCT_I387_VALID is set), flags, user_regs, debugreg[*] * * - PVH guests are the same as HVM guests, but additionally use ctrlreg[3] to * set cr3. All other fields not used should be set to 0. */ struct vcpu_guest_context { /* FPU registers come first so they can be aligned for FXSAVE/FXRSTOR. */ struct { char x[512]; } fpu_ctxt; /* User-level FPU registers */ #define VGCF_I387_VALID … #define VGCF_IN_KERNEL … #define _VGCF_i387_valid … #define VGCF_i387_valid … #define _VGCF_in_kernel … #define VGCF_in_kernel … #define _VGCF_failsafe_disables_events … #define VGCF_failsafe_disables_events … #define _VGCF_syscall_disables_events … #define VGCF_syscall_disables_events … #define _VGCF_online … #define VGCF_online … unsigned long flags; /* VGCF_* flags */ struct cpu_user_regs user_regs; /* User-level CPU registers */ struct trap_info trap_ctxt[256]; /* Virtual IDT */ unsigned long ldt_base, ldt_ents; /* LDT (linear address, # ents) */ unsigned long gdt_frames[16], gdt_ents; /* GDT (machine frames, # ents) */ unsigned long kernel_ss, kernel_sp; /* Virtual TSS (only SS1/SP1) */ /* NB. User pagetable on x86/64 is placed in ctrlreg[1]. */ unsigned long ctrlreg[8]; /* CR0-CR7 (control registers) */ unsigned long debugreg[8]; /* DB0-DB7 (debug registers) */ #ifdef __i386__ unsigned long event_callback_cs; /* CS:EIP of event callback */ unsigned long event_callback_eip; unsigned long failsafe_callback_cs; /* CS:EIP of failsafe callback */ unsigned long failsafe_callback_eip; #else unsigned long event_callback_eip; unsigned long failsafe_callback_eip; unsigned long syscall_callback_eip; #endif unsigned long vm_assist; /* VMASST_TYPE_* bitmap */ #ifdef __x86_64__ /* Segment base addresses. */ uint64_t fs_base; uint64_t gs_base_kernel; uint64_t gs_base_user; #endif }; DEFINE_GUEST_HANDLE_STRUCT(vcpu_guest_context); /* AMD PMU registers and structures */ struct xen_pmu_amd_ctxt { /* * Offsets to counter and control MSRs (relative to xen_pmu_arch.c.amd). * For PV(H) guests these fields are RO. */ uint32_t counters; uint32_t ctrls; /* Counter MSRs */ #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L uint64_t regs[]; #elif defined(__GNUC__) uint64_t regs[0]; #endif }; /* Intel PMU registers and structures */ struct xen_pmu_cntr_pair { uint64_t counter; uint64_t control; }; struct xen_pmu_intel_ctxt { /* * Offsets to fixed and architectural counter MSRs (relative to * xen_pmu_arch.c.intel). * For PV(H) guests these fields are RO. */ uint32_t fixed_counters; uint32_t arch_counters; /* PMU registers */ uint64_t global_ctrl; uint64_t global_ovf_ctrl; uint64_t global_status; uint64_t fixed_ctrl; uint64_t ds_area; uint64_t pebs_enable; uint64_t debugctl; /* Fixed and architectural counter MSRs */ #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L uint64_t regs[]; #elif defined(__GNUC__) uint64_t regs[0]; #endif }; /* Sampled domain's registers */ struct xen_pmu_regs { uint64_t ip; uint64_t sp; uint64_t flags; uint16_t cs; uint16_t ss; uint8_t cpl; uint8_t pad[3]; }; /* PMU flags */ #define PMU_CACHED … #define PMU_SAMPLE_USER … #define PMU_SAMPLE_REAL … #define PMU_SAMPLE_PV … /* * Architecture-specific information describing state of the processor at * the time of PMU interrupt. * Fields of this structure marked as RW for guest should only be written by * the guest when PMU_CACHED bit in pmu_flags is set (which is done by the * hypervisor during PMU interrupt). Hypervisor will read updated data in * XENPMU_flush hypercall and clear PMU_CACHED bit. */ struct xen_pmu_arch { union { /* * Processor's registers at the time of interrupt. * WO for hypervisor, RO for guests. */ struct xen_pmu_regs regs; /* * Padding for adding new registers to xen_pmu_regs in * the future */ #define XENPMU_REGS_PAD_SZ … uint8_t pad[XENPMU_REGS_PAD_SZ]; } r; /* WO for hypervisor, RO for guest */ uint64_t pmu_flags; /* * APIC LVTPC register. * RW for both hypervisor and guest. * Only APIC_LVT_MASKED bit is loaded by the hypervisor into hardware * during XENPMU_flush or XENPMU_lvtpc_set. */ union { uint32_t lapic_lvtpc; uint64_t pad; } l; /* * Vendor-specific PMU registers. * RW for both hypervisor and guest (see exceptions above). * Guest's updates to this field are verified and then loaded by the * hypervisor into hardware during XENPMU_flush */ union { struct xen_pmu_amd_ctxt amd; struct xen_pmu_intel_ctxt intel; /* * Padding for contexts (fixed parts only, does not include * MSR banks that are specified by offsets) */ #define XENPMU_CTXT_PAD_SZ … uint8_t pad[XENPMU_CTXT_PAD_SZ]; } c; }; #endif /* !__ASSEMBLY__ */ /* * Prefix forces emulation of some non-trapping instructions. * Currently only CPUID. */ #include <asm/emulate_prefix.h> #define XEN_EMULATE_PREFIX … #define XEN_CPUID … #endif /* _ASM_X86_XEN_INTERFACE_H */
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