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fix: move INITRD_MAP_BASE past LAPIC MMIO region #94

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Merged
danbugs merged 3 commits into from
Jun 17, 2026
Merged

fix: move INITRD_MAP_BASE past LAPIC MMIO region #94

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c9e73a3
fix: move INITRD_MAP_BASE past LAPIC MMIO region
danbugs Jun 16, 2026
25d10bf
fix: update doc comment to reflect new INITRD_MAP_BASE address
danbugs Jun 16, 2026
e06d5b6
fix: bump ILCompiler to 9.0.17 to match SDK 9.0-alpine
danbugs Jun 16, 2026
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2 changes: 1 addition & 1 deletion examples/dotnet-nativeaot/HelloNativeAot.csproj
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,6 @@
<InvariantGlobalization>true</InvariantGlobalization>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="runtime.linux-musl-x64.Microsoft.DotNet.ILCompiler" Version="9.0.16" />
<PackageReference Include="runtime.linux-musl-x64.Microsoft.DotNet.ILCompiler" Version="9.0.17" />
</ItemGroup>
</Project>
12 changes: 7 additions & 5 deletions host/src/lib.rs
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Expand Up @@ -2282,9 +2282,11 @@ impl Sandbox {
let mut usbox = UninitializedSandbox::new(env, Some(config.sandbox_config()))?;

// Map the initrd file (zero-copy via mmap)
// Place at 3 GiB — high enough to not overlap any reasonable
// primary shared memory region, within the 4 GiB identity map.
const INITRD_MAP_BASE: u64 = 0xC000_0000; // 3 GiB
// Place past the x86 LAPIC MMIO page (0xFEE0_0000) so that
// large initrds (>1 GiB) don't overlap it and trigger EEXIST
// from KVM_SET_USER_MEMORY_REGION on kernels where in-kernel
// IRQCHIP reserves that range.
const INITRD_MAP_BASE: u64 = 0xFEF0_0000;
if let Some(path) = initrd_path {
usbox.map_file_cow(path, INITRD_MAP_BASE, Some("initrd"))?;
}
Expand Down Expand Up @@ -2467,7 +2469,7 @@ impl Sandbox {
}

/// Load a snapshot with an initrd file re-mapped at the standard
/// guest VA (0xC000_0000). Required when the snapshot was taken
/// guest VA (0xFEF0_0000). Required when the snapshot was taken
/// from a cpiovfs-backed guest whose VFS nodes point into the
/// initrd region.
pub fn from_snapshot_file_with_initrd<P: AsRef<Path>, I: AsRef<Path>>(
Expand Down Expand Up @@ -2527,7 +2529,7 @@ impl Sandbox {

let mut inner = MultiUseSandbox::from_snapshot(arc.clone(), host_funcs, None)?;

const INITRD_MAP_BASE: u64 = 0xC000_0000;
const INITRD_MAP_BASE: u64 = 0xFEF0_0000;
if let Some(ref initrd_path) = initrd {
inner.map_file_cow(initrd_path, INITRD_MAP_BASE, Some("initrd"))?;
}
Comment on lines +2532 to 2535
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