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125 lines
4.1 KiB
C
125 lines
4.1 KiB
C
/*
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* Copyright (C) 2016 Veertu Inc,
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* Copyright (C) 2017 Google Inc,
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "vmx.h"
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#include "x86_descr.h"
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#define VMX_SEGMENT_FIELD(seg) \
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[R_##seg] = { \
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.selector = VMCS_GUEST_##seg##_SELECTOR, \
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.base = VMCS_GUEST_##seg##_BASE, \
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.limit = VMCS_GUEST_##seg##_LIMIT, \
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.ar_bytes = VMCS_GUEST_##seg##_ACCESS_RIGHTS, \
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}
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static const struct vmx_segment_field {
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int selector;
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int base;
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int limit;
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int ar_bytes;
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} vmx_segment_fields[] = {
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VMX_SEGMENT_FIELD(ES),
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VMX_SEGMENT_FIELD(CS),
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VMX_SEGMENT_FIELD(SS),
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VMX_SEGMENT_FIELD(DS),
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VMX_SEGMENT_FIELD(FS),
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VMX_SEGMENT_FIELD(GS),
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VMX_SEGMENT_FIELD(LDTR),
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VMX_SEGMENT_FIELD(TR),
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};
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uint32_t vmx_read_segment_limit(CPUState *cpu, X86Seg seg)
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{
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return (uint32_t)rvmcs(cpu->hvf->fd, vmx_segment_fields[seg].limit);
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}
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uint32_t vmx_read_segment_ar(CPUState *cpu, X86Seg seg)
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{
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return (uint32_t)rvmcs(cpu->hvf->fd, vmx_segment_fields[seg].ar_bytes);
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}
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uint64_t vmx_read_segment_base(CPUState *cpu, X86Seg seg)
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{
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return rvmcs(cpu->hvf->fd, vmx_segment_fields[seg].base);
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}
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x68_segment_selector vmx_read_segment_selector(CPUState *cpu, X86Seg seg)
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{
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x68_segment_selector sel;
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sel.sel = rvmcs(cpu->hvf->fd, vmx_segment_fields[seg].selector);
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return sel;
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}
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void vmx_write_segment_selector(struct CPUState *cpu, x68_segment_selector selector, X86Seg seg)
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{
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wvmcs(cpu->hvf->fd, vmx_segment_fields[seg].selector, selector.sel);
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}
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void vmx_read_segment_descriptor(struct CPUState *cpu, struct vmx_segment *desc, X86Seg seg)
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{
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desc->sel = rvmcs(cpu->hvf->fd, vmx_segment_fields[seg].selector);
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desc->base = rvmcs(cpu->hvf->fd, vmx_segment_fields[seg].base);
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desc->limit = rvmcs(cpu->hvf->fd, vmx_segment_fields[seg].limit);
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desc->ar = rvmcs(cpu->hvf->fd, vmx_segment_fields[seg].ar_bytes);
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}
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void vmx_write_segment_descriptor(CPUState *cpu, struct vmx_segment *desc, X86Seg seg)
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{
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const struct vmx_segment_field *sf = &vmx_segment_fields[seg];
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wvmcs(cpu->hvf->fd, sf->base, desc->base);
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wvmcs(cpu->hvf->fd, sf->limit, desc->limit);
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wvmcs(cpu->hvf->fd, sf->selector, desc->sel);
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wvmcs(cpu->hvf->fd, sf->ar_bytes, desc->ar);
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}
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void x86_segment_descriptor_to_vmx(struct CPUState *cpu, x68_segment_selector selector, struct x86_segment_descriptor *desc, struct vmx_segment *vmx_desc)
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{
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vmx_desc->sel = selector.sel;
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vmx_desc->base = x86_segment_base(desc);
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vmx_desc->limit = x86_segment_limit(desc);
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vmx_desc->ar = (selector.sel ? 0 : 1) << 16 |
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desc->g << 15 |
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desc->db << 14 |
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desc->l << 13 |
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desc->avl << 12 |
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desc->p << 7 |
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desc->dpl << 5 |
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desc->s << 4 |
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desc->type;
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}
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void vmx_segment_to_x86_descriptor(struct CPUState *cpu, struct vmx_segment *vmx_desc, struct x86_segment_descriptor *desc)
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{
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x86_set_segment_limit(desc, vmx_desc->limit);
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x86_set_segment_base(desc, vmx_desc->base);
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desc->type = vmx_desc->ar & 15;
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desc->s = (vmx_desc->ar >> 4) & 1;
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desc->dpl = (vmx_desc->ar >> 5) & 3;
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desc->p = (vmx_desc->ar >> 7) & 1;
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desc->avl = (vmx_desc->ar >> 12) & 1;
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desc->l = (vmx_desc->ar >> 13) & 1;
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desc->db = (vmx_desc->ar >> 14) & 1;
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desc->g = (vmx_desc->ar >> 15) & 1;
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}
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