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base repository: hyperlight-dev/hyperlight
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head repository: hyperlight-dev/hyperlight
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compare: hyperlight-unikraft
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  • 5 commits
  • 6 files changed
  • 1 contributor

Commits on Jun 24, 2026

  1. perf(whp): batch register resets, cache xsave, add whp-no-surrogate mode 

    Batch vCPU register resets: combine GPR + debug + special registers
into a single WHvSetVirtualProcessorRegisters call (3 calls → 1).

Cache xsave template: build the zeroed xsave buffer once during
WhpVm::new(), reuse on every reset (eliminates 2 WHvGet* reads
per restore).

Add whp-no-surrogate feature flag: when enabled, allocates sandbox
memory with VirtualAlloc (not CreateFileMappingA), maps GPA ranges
with WHvMapGpaRange (not WHvMapGpaRange2), and zeros scratch via
VirtualFree(MEM_DECOMMIT) + VirtualAlloc(MEM_COMMIT) for near-instant
lazy zeroing. Intended for single-partition-per-process scenarios
where the WHvMapGpaRange multi-partition limitation does not apply.

Signed-off-by: danbugs <danilochiarlone@gmail.com>
    @danbugs
    danbugs committed Jun 24, 2026
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  2. perf: add restore_preserving_file_mappings for read-only regions 

    Skip unmapping and remapping MemoryRegionType::MappedFile regions
during snapshot restore. These are mapped PAGE_READONLY at the
hypervisor level, so guest writes go through copy-on-write via
scratch memory — the host-side mapping is unchanged across restores.

Signed-off-by: danbugs <danilochiarlone@gmail.com>
    @danbugs
    danbugs committed Jun 24, 2026
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  3. fix: address review findings in whp-no-surrogate 

    - zero(): panic instead of falling through to fill(0) if MEM_COMMIT
  fails after MEM_DECOMMIT — decommitted pages are unusable
- WhpVm::new(): propagate xsave template errors instead of expect()
- HostMapping Drop: gate INVALID_HANDLE_VALUE branch on the feature
  so it cannot be an empty no-op block

Signed-off-by: danbugs <danilochiarlone@gmail.com>
    @danbugs
    danbugs committed Jun 24, 2026
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  4. fix: adapt restore_preserving_file_mappings to upstream Snapshot API 

    Signed-off-by: danbugs <danilochiarlone@gmail.com>
    @danbugs
    danbugs committed Jun 24, 2026
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  5. fix: add DirectAlloc arm to ReadonlySharedMemory::host_region_base 

    Signed-off-by: danbugs <danilochiarlone@gmail.com>
    @danbugs
    danbugs committed Jun 24, 2026
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