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| 1 | +use alloc::collections::BTreeMap; |
| 2 | +use core::fmt::{Debug, Formatter, Result}; |
| 3 | + |
| 4 | +use rvm::{GuestPhysAddr, HostPhysAddr, MemFlags, NestedPageTable, RvmError, RvmResult}; |
| 5 | + |
| 6 | +use super::hal::RvmHalImpl; |
| 7 | +use crate::mm::{address::is_aligned, PAGE_SIZE}; |
| 8 | + |
| 9 | +#[derive(Debug)] |
| 10 | +enum Mapper { |
| 11 | + Offset(usize), |
| 12 | +} |
| 13 | + |
| 14 | +#[derive(Debug)] |
| 15 | +pub struct GuestMemoryRegion { |
| 16 | + pub gpa: GuestPhysAddr, |
| 17 | + pub hpa: HostPhysAddr, |
| 18 | + pub size: usize, |
| 19 | + pub flags: MemFlags, |
| 20 | +} |
| 21 | + |
| 22 | +pub struct MapRegion { |
| 23 | + pub start: GuestPhysAddr, |
| 24 | + pub size: usize, |
| 25 | + pub flags: MemFlags, |
| 26 | + mapper: Mapper, |
| 27 | +} |
| 28 | + |
| 29 | +impl MapRegion { |
| 30 | + pub fn new_offset( |
| 31 | + start_gpa: GuestPhysAddr, |
| 32 | + start_hpa: HostPhysAddr, |
| 33 | + size: usize, |
| 34 | + flags: MemFlags, |
| 35 | + ) -> Self { |
| 36 | + assert!(is_aligned(start_gpa)); |
| 37 | + assert!(is_aligned(start_hpa)); |
| 38 | + assert!(is_aligned(size)); |
| 39 | + let offset = start_gpa - start_hpa; |
| 40 | + Self { |
| 41 | + start: start_gpa, |
| 42 | + size, |
| 43 | + flags, |
| 44 | + mapper: Mapper::Offset(offset), |
| 45 | + } |
| 46 | + } |
| 47 | + |
| 48 | + fn is_overlap_with(&self, other: &Self) -> bool { |
| 49 | + let s0 = self.start; |
| 50 | + let e0 = s0 + self.size; |
| 51 | + let s1 = other.start; |
| 52 | + let e1 = s1 + other.size; |
| 53 | + !(e0 <= s1 || e1 <= s0) |
| 54 | + } |
| 55 | + |
| 56 | + fn target(&self, gpa: GuestPhysAddr) -> HostPhysAddr { |
| 57 | + match self.mapper { |
| 58 | + Mapper::Offset(off) => gpa.wrapping_sub(off), |
| 59 | + } |
| 60 | + } |
| 61 | + |
| 62 | + fn map_to(&self, npt: &mut NestedPageTable<RvmHalImpl>) -> RvmResult { |
| 63 | + let mut start = self.start; |
| 64 | + let end = start + self.size; |
| 65 | + while start < end { |
| 66 | + let target = self.target(start); |
| 67 | + npt.map(start, target, self.flags)?; |
| 68 | + start += PAGE_SIZE; |
| 69 | + } |
| 70 | + Ok(()) |
| 71 | + } |
| 72 | + |
| 73 | + fn unmap_to(&self, npt: &mut NestedPageTable<RvmHalImpl>) -> RvmResult { |
| 74 | + let mut start = self.start; |
| 75 | + let end = start + self.size; |
| 76 | + while start < end { |
| 77 | + npt.unmap(start)?; |
| 78 | + start += PAGE_SIZE; |
| 79 | + } |
| 80 | + Ok(()) |
| 81 | + } |
| 82 | +} |
| 83 | + |
| 84 | +impl Debug for MapRegion { |
| 85 | + fn fmt(&self, f: &mut Formatter) -> Result { |
| 86 | + f.debug_struct("MapRegion") |
| 87 | + .field("range", &(self.start..self.start + self.size)) |
| 88 | + .field("size", &self.size) |
| 89 | + .field("flags", &self.flags) |
| 90 | + .field("mapper", &self.mapper) |
| 91 | + .finish() |
| 92 | + } |
| 93 | +} |
| 94 | + |
| 95 | +impl From<GuestMemoryRegion> for MapRegion { |
| 96 | + fn from(r: GuestMemoryRegion) -> Self { |
| 97 | + Self::new_offset(r.gpa, r.hpa, r.size, r.flags) |
| 98 | + } |
| 99 | +} |
| 100 | + |
| 101 | +pub struct GuestPhysMemorySet { |
| 102 | + regions: BTreeMap<GuestPhysAddr, MapRegion>, |
| 103 | + npt: NestedPageTable<RvmHalImpl>, |
| 104 | +} |
| 105 | + |
| 106 | +impl GuestPhysMemorySet { |
| 107 | + pub fn new() -> RvmResult<Self> { |
| 108 | + Ok(Self { |
| 109 | + npt: NestedPageTable::new()?, |
| 110 | + regions: BTreeMap::new(), |
| 111 | + }) |
| 112 | + } |
| 113 | + |
| 114 | + pub fn nest_page_table_root(&self) -> HostPhysAddr { |
| 115 | + self.npt.root_paddr() |
| 116 | + } |
| 117 | + |
| 118 | + fn test_free_area(&self, other: &MapRegion) -> bool { |
| 119 | + if let Some((_, before)) = self.regions.range(..other.start).last() { |
| 120 | + if before.is_overlap_with(other) { |
| 121 | + return false; |
| 122 | + } |
| 123 | + } |
| 124 | + if let Some((_, after)) = self.regions.range(other.start..).next() { |
| 125 | + if after.is_overlap_with(other) { |
| 126 | + return false; |
| 127 | + } |
| 128 | + } |
| 129 | + true |
| 130 | + } |
| 131 | + |
| 132 | + pub fn map_region(&mut self, region: MapRegion) -> RvmResult { |
| 133 | + if region.size == 0 { |
| 134 | + return Ok(()); |
| 135 | + } |
| 136 | + if !self.test_free_area(®ion) { |
| 137 | + warn!( |
| 138 | + "MapRegion({:#x}..{:#x}) overlapped in:\n{:#x?}", |
| 139 | + region.start, |
| 140 | + region.start + region.size, |
| 141 | + self |
| 142 | + ); |
| 143 | + return Err(RvmError::InvalidParam); |
| 144 | + } |
| 145 | + region.map_to(&mut self.npt)?; |
| 146 | + self.regions.insert(region.start, region); |
| 147 | + Ok(()) |
| 148 | + } |
| 149 | + |
| 150 | + pub fn clear(&mut self) { |
| 151 | + for region in self.regions.values() { |
| 152 | + region.unmap_to(&mut self.npt).unwrap(); |
| 153 | + } |
| 154 | + self.regions.clear(); |
| 155 | + } |
| 156 | +} |
| 157 | + |
| 158 | +impl Drop for GuestPhysMemorySet { |
| 159 | + fn drop(&mut self) { |
| 160 | + self.clear(); |
| 161 | + } |
| 162 | +} |
| 163 | + |
| 164 | +impl Debug for GuestPhysMemorySet { |
| 165 | + fn fmt(&self, f: &mut Formatter) -> Result { |
| 166 | + f.debug_struct("GuestPhysMemorySet") |
| 167 | + .field("page_table_root", &self.nest_page_table_root()) |
| 168 | + .field("regions", &self.regions) |
| 169 | + .finish() |
| 170 | + } |
| 171 | +} |
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