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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build amd64
package kvm
import (
"gvisor.dev/gvisor/pkg/cpuid"
"gvisor.dev/gvisor/pkg/sentry/platform/ring0"
)
// userMemoryRegion is a region of physical memory.
//
// This mirrors kvm_memory_region.
type userMemoryRegion struct {
slot uint32
flags uint32
guestPhysAddr uint64
memorySize uint64
userspaceAddr uint64
}
// userRegs represents KVM user registers.
//
// This mirrors kvm_regs.
type userRegs struct {
RAX uint64
RBX uint64
RCX uint64
RDX uint64
RSI uint64
RDI uint64
RSP uint64
RBP uint64
R8 uint64
R9 uint64
R10 uint64
R11 uint64
R12 uint64
R13 uint64
R14 uint64
R15 uint64
RIP uint64
RFLAGS uint64
}
// systemRegs represents KVM system registers.
//
// This mirrors kvm_sregs.
type systemRegs struct {
CS segment
DS segment
ES segment
FS segment
GS segment
SS segment
TR segment
LDT segment
GDT descriptor
IDT descriptor
CR0 uint64
CR2 uint64
CR3 uint64
CR4 uint64
CR8 uint64
EFER uint64
apicBase uint64
interruptBitmap [(_KVM_NR_INTERRUPTS + 63) / 64]uint64
}
// segment is the expanded form of a segment register.
//
// This mirrors kvm_segment.
type segment struct {
base uint64
limit uint32
selector uint16
typ uint8
present uint8
DPL uint8
DB uint8
S uint8
L uint8
G uint8
AVL uint8
unusable uint8
_ uint8
}
// Clear clears the segment and marks it unusable.
func (s *segment) Clear() {
*s = segment{unusable: 1}
}
// selector is a segment selector.
type selector uint16
// tobool is a simple helper.
func tobool(x ring0.SegmentDescriptorFlags) uint8 {
if x != 0 {
return 1
}
return 0
}
// Load loads the segment described by d into the segment s.
//
// The argument sel is recorded as the segment selector index.
func (s *segment) Load(d *ring0.SegmentDescriptor, sel ring0.Selector) {
flag := d.Flags()
if flag&ring0.SegmentDescriptorPresent == 0 {
s.Clear()
return
}
s.base = uint64(d.Base())
s.limit = d.Limit()
s.typ = uint8((flag>>8)&0xF) | 1
s.S = tobool(flag & ring0.SegmentDescriptorSystem)
s.DPL = uint8(d.DPL())
s.present = tobool(flag & ring0.SegmentDescriptorPresent)
s.AVL = tobool(flag & ring0.SegmentDescriptorAVL)
s.L = tobool(flag & ring0.SegmentDescriptorLong)
s.DB = tobool(flag & ring0.SegmentDescriptorDB)
s.G = tobool(flag & ring0.SegmentDescriptorG)
if s.L != 0 {
s.limit = 0xffffffff
}
s.unusable = 0
s.selector = uint16(sel)
}
// descriptor describes a region of physical memory.
//
// It corresponds to the pseudo-descriptor used in the x86 LGDT and LIDT
// instructions, and mirrors kvm_dtable.
type descriptor struct {
base uint64
limit uint16
_ [3]uint16
}
// modelControlRegister is an MSR entry.
//
// This mirrors kvm_msr_entry.
type modelControlRegister struct {
index uint32
_ uint32
data uint64
}
// modelControlRegisers is a collection of MSRs.
//
// This mirrors kvm_msrs.
type modelControlRegisters struct {
nmsrs uint32
_ uint32
entries [16]modelControlRegister
}
// runData is the run structure. This may be mapped for synchronous register
// access (although that doesn't appear to be supported by my kernel at least).
//
// This mirrors kvm_run.
type runData struct {
requestInterruptWindow uint8
_ [7]uint8
exitReason uint32
readyForInterruptInjection uint8
ifFlag uint8
_ [2]uint8
cr8 uint64
apicBase uint64
// This is the union data for exits. Interpretation depends entirely on
// the exitReason above (see vCPU code for more information).
data [32]uint64
}
// cpuidEntry is a single CPUID entry.
//
// This mirrors kvm_cpuid_entry2.
type cpuidEntry struct {
function uint32
index uint32
flags uint32
eax uint32
ebx uint32
ecx uint32
edx uint32
_ [3]uint32
}
// cpuidEntries is a collection of CPUID entries.
//
// This mirrors kvm_cpuid2.
type cpuidEntries struct {
nr uint32
_ uint32
entries [_KVM_NR_CPUID_ENTRIES]cpuidEntry
}
// updateGlobalOnce does global initialization. It has to be called only once.
func updateGlobalOnce(fd int) error {
physicalInit()
err := updateSystemValues(int(fd))
ring0.Init(cpuid.HostFeatureSet())
return err
}
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