Use WHvResetPartition on Windows instead of manual vCPU state reset#1306
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Use WHvResetPartition on Windows instead of manual vCPU state reset#1306ludfjig wants to merge 4 commits intohyperlight-dev:mainfrom
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Signed-off-by: Ludvig Liljenberg <4257730+ludfjig@users.noreply.github.com>
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Signed-off-by: Ludvig Liljenberg <4257730+ludfjig@users.noreply.github.com>
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needs #1319
Replace the manual set_regs/set_debug_regs/reset_xsave calls in reset_vcpu on Windows with a single WHvResetPartition API call. This resets a bunch of state that wasn't reset before, including msrs, apic/lapic, interruptrs, vmcs/b internals, etc.
This will clear all guest visible state, at the expense of a little bit performance (rougly +~50 micro seconds compared to before on my local machine).
WHvResetPartitionis an internal API available fromWin11 21H2, but qemu already uses it so I assume it's stable enough.WHvResetPartitionhas been shipped since Windows 11 21H2 (original Windows 11 release, October 2021) and Windows Server 2022 (released August 2021).Our windows 2022 CI can't handle this it seems like, but our windows 2025 works