1 /* 2 * Copyright (C) 2016 Veertu Inc, 3 * Copyright (C) 2017 Google Inc, 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU Lesser General Public 7 * License as published by the Free Software Foundation; either 8 * version 2.1 of the License, or (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * Lesser General Public License for more details. 14 * 15 * You should have received a copy of the GNU Lesser General Public 16 * License along with this program; if not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #include "qemu/osdep.h" 20 21 #include "qemu-common.h" 22 #include "vmx.h" 23 #include "x86_descr.h" 24 25 #define VMX_SEGMENT_FIELD(seg) \ 26 [R_##seg] = { \ 27 .selector = VMCS_GUEST_##seg##_SELECTOR, \ 28 .base = VMCS_GUEST_##seg##_BASE, \ 29 .limit = VMCS_GUEST_##seg##_LIMIT, \ 30 .ar_bytes = VMCS_GUEST_##seg##_ACCESS_RIGHTS, \ 31 } 32 33 static const struct vmx_segment_field { 34 int selector; 35 int base; 36 int limit; 37 int ar_bytes; 38 } vmx_segment_fields[] = { 39 VMX_SEGMENT_FIELD(ES), 40 VMX_SEGMENT_FIELD(CS), 41 VMX_SEGMENT_FIELD(SS), 42 VMX_SEGMENT_FIELD(DS), 43 VMX_SEGMENT_FIELD(FS), 44 VMX_SEGMENT_FIELD(GS), 45 VMX_SEGMENT_FIELD(LDTR), 46 VMX_SEGMENT_FIELD(TR), 47 }; 48 49 uint32_t vmx_read_segment_limit(CPUState *cpu, X86Seg seg) 50 { 51 return (uint32_t)rvmcs(cpu->hvf->fd, vmx_segment_fields[seg].limit); 52 } 53 54 uint32_t vmx_read_segment_ar(CPUState *cpu, X86Seg seg) 55 { 56 return (uint32_t)rvmcs(cpu->hvf->fd, vmx_segment_fields[seg].ar_bytes); 57 } 58 59 uint64_t vmx_read_segment_base(CPUState *cpu, X86Seg seg) 60 { 61 return rvmcs(cpu->hvf->fd, vmx_segment_fields[seg].base); 62 } 63 64 x68_segment_selector vmx_read_segment_selector(CPUState *cpu, X86Seg seg) 65 { 66 x68_segment_selector sel; 67 sel.sel = rvmcs(cpu->hvf->fd, vmx_segment_fields[seg].selector); 68 return sel; 69 } 70 71 void vmx_write_segment_selector(struct CPUState *cpu, x68_segment_selector selector, X86Seg seg) 72 { 73 wvmcs(cpu->hvf->fd, vmx_segment_fields[seg].selector, selector.sel); 74 } 75 76 void vmx_read_segment_descriptor(struct CPUState *cpu, struct vmx_segment *desc, X86Seg seg) 77 { 78 desc->sel = rvmcs(cpu->hvf->fd, vmx_segment_fields[seg].selector); 79 desc->base = rvmcs(cpu->hvf->fd, vmx_segment_fields[seg].base); 80 desc->limit = rvmcs(cpu->hvf->fd, vmx_segment_fields[seg].limit); 81 desc->ar = rvmcs(cpu->hvf->fd, vmx_segment_fields[seg].ar_bytes); 82 } 83 84 void vmx_write_segment_descriptor(CPUState *cpu, struct vmx_segment *desc, X86Seg seg) 85 { 86 const struct vmx_segment_field *sf = &vmx_segment_fields[seg]; 87 88 wvmcs(cpu->hvf->fd, sf->base, desc->base); 89 wvmcs(cpu->hvf->fd, sf->limit, desc->limit); 90 wvmcs(cpu->hvf->fd, sf->selector, desc->sel); 91 wvmcs(cpu->hvf->fd, sf->ar_bytes, desc->ar); 92 } 93 94 void x86_segment_descriptor_to_vmx(struct CPUState *cpu, x68_segment_selector selector, struct x86_segment_descriptor *desc, struct vmx_segment *vmx_desc) 95 { 96 vmx_desc->sel = selector.sel; 97 vmx_desc->base = x86_segment_base(desc); 98 vmx_desc->limit = x86_segment_limit(desc); 99 100 vmx_desc->ar = (selector.sel ? 0 : 1) << 16 | 101 desc->g << 15 | 102 desc->db << 14 | 103 desc->l << 13 | 104 desc->avl << 12 | 105 desc->p << 7 | 106 desc->dpl << 5 | 107 desc->s << 4 | 108 desc->type; 109 } 110 111 void vmx_segment_to_x86_descriptor(struct CPUState *cpu, struct vmx_segment *vmx_desc, struct x86_segment_descriptor *desc) 112 { 113 x86_set_segment_limit(desc, vmx_desc->limit); 114 x86_set_segment_base(desc, vmx_desc->base); 115 116 desc->type = vmx_desc->ar & 15; 117 desc->s = (vmx_desc->ar >> 4) & 1; 118 desc->dpl = (vmx_desc->ar >> 5) & 3; 119 desc->p = (vmx_desc->ar >> 7) & 1; 120 desc->avl = (vmx_desc->ar >> 12) & 1; 121 desc->l = (vmx_desc->ar >> 13) & 1; 122 desc->db = (vmx_desc->ar >> 14) & 1; 123 desc->g = (vmx_desc->ar >> 15) & 1; 124 } 125 126