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Restore does not rewind the guest TSC on KVM #2014

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#2015
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Restore does not rewind the guest TSC on KVM#2014
Bug
#2015
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ludfjig
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@ludfjig
ludfjig
opened on Nov 2, 2026

After restore, the guest TSC should equal its value in the snapshot. On KVM, a restore within about a second of the previous one leaves it running. KVM ignores a host IA32_TSC write within one second of the value it expects. MSHV restores it exactly.

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  1. ludfjig
    added
    lifecycle/needs-reviewThe issue has not yet been reviewed.
    on Nov 2, 2026
  2. ludfjig
    added the
    Bug
    issue type on Nov 2, 2026
  3. ludfjig
    added 2 commits that reference this issue on Nov 3, 2026

    Restore the guest TSC exactly on KVM

    71b3644

    Restore the guest TSC exactly on KVM

    7591df8
  4. ludfjig
    added a parent issue on Nov 3, 2026
  5. github-project-automation
    added this to Hyperlight Roadmapon Nov 3, 2026
  6. ludfjig
    self-assigned this
    on Nov 3, 2026
  7. ludfjig
    closed this as completedin 3294ee3on Nov 4, 2026
  8. github-project-automation
    moved this to Done in Hyperlight Roadmapon Nov 4, 2026
  9. ludfjig
    added a commit that references this issue on Nov 4, 2026

    Restore the guest TSC exactly on KVM (hyperlight-dev#2015)

    3294ee3
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