diff options
Diffstat (limited to 'examples/long_mode.rs')
| -rw-r--r-- | examples/long_mode.rs | 26 |
1 files changed, 19 insertions, 7 deletions
diff --git a/examples/long_mode.rs b/examples/long_mode.rs index 0696ae4..5969a48 100644 --- a/examples/long_mode.rs +++ b/examples/long_mode.rs @@ -6,6 +6,7 @@ use kvm_rs::{PhysAddr, UserMem}; fn setup_long_mode_segments(sregs: &mut kvm_sys::kvm_sregs) { let code_seg = |seg: &mut kvm_sys::kvm_segment| { + // Segment base address (unused in 64bit). seg.base = 0x0; // Limit (unused in 64bit). seg.limit = 0x0; @@ -28,6 +29,7 @@ fn setup_long_mode_segments(sregs: &mut kvm_sys::kvm_sregs) { }; let data_seg = |seg: &mut kvm_sys::kvm_segment| { + // Segment base address (unused in 64bit). seg.base = 0x0; // Limit (unused in 64bit). seg.limit = 0x0; @@ -88,20 +90,21 @@ fn setup_long_mode_4level_paging(mem: &mut UserMem) -> PhysAddr { let mut w = |addr: PhysAddr, val: u64| mem.load(addr, &val.to_le_bytes()); // PML4E[0] refers to PDPE[0:4095]. - w(PhysAddr(0x0000), PAGE_ENTRY_PRESENT | PAGE_RENTRY_RW | 0x1000); + w(PhysAddr(0x0000), PAGE_ENTRY_PRESENT | PAGE_ENTRY_RW | 0x1000); // PDPE[0] refers to PDE[0:4095]. - w(PhysAddr(0x1000), PAGE_ENTRY_PRESENT | PAGE_RENTRY_RW | 0x2000); + w(PhysAddr(0x1000), PAGE_ENTRY_PRESENT | PAGE_ENTRY_RW | 0x2000); // PDE[0] refers to PTE[0:4095]. - w(PhysAddr(0x2000), PAGE_ENTRY_PRESENT | PAGE_RENTRY_RW | 0x3000); + w(PhysAddr(0x2000), PAGE_ENTRY_PRESENT | PAGE_ENTRY_RW | 0x3000); // PTE[0] maps Virt [0x0000:0x0fff] -> Phys [0x4000:0x4fff]. - w(PhysAddr(0x3000), PAGE_ENTRY_PRESENT | PAGE_RENTRY_RW | 0x4000); + // Just because we can, map this page readonly, as we loaded our guest sw here. + w(PhysAddr(0x3000), PAGE_ENTRY_PRESENT | 0x4000); // PTE[1] maps Virt [0x1000:0x1fff] -> Phys [0x5000:0x5fff]. - w(PhysAddr(0x3008), PAGE_ENTRY_PRESENT | PAGE_RENTRY_RW | 0x5000); + w(PhysAddr(0x3008), PAGE_ENTRY_PRESENT | PAGE_ENTRY_RW | 0x5000); // PTE[2] maps Virt [0x2000:0x2fff] -> Phys [0x6000:0x6fff]. - w(PhysAddr(0x3010), PAGE_ENTRY_PRESENT | PAGE_RENTRY_RW | 0x6000); + w(PhysAddr(0x3010), PAGE_ENTRY_PRESENT | PAGE_ENTRY_RW | 0x6000); // PTE[3] maps Virt [0x3000:0x3fff] -> Phys [0x7000:0x7fff]. - w(PhysAddr(0x3018), PAGE_ENTRY_PRESENT | PAGE_RENTRY_RW | 0x7000); + w(PhysAddr(0x3018), PAGE_ENTRY_PRESENT | PAGE_ENTRY_RW | 0x7000); // Return address of PML4. PhysAddr(0x0000) @@ -178,8 +181,17 @@ fn main() -> std::io::Result<()> { data ); } + KvmExit::Debug(_pc) => {} }; } + // The guest writes at virtual address [0x2000 - 0x2003] which will be visible in physical + // memory at [0x6000 - 0x6003] due to the paging structure we setup. + // See `setup_long_mode_4level_paging` above for details. + assert_eq!( + &mem.as_ref()[0x4000 + 0x2000..][..4], + &[0xaa, 0xbb, 0xcc, 0xdd] + ); + Ok(()) } |