executor: sys/linux: implement SYZOS_API_NESTED_INTEL_VMWRITE_MASK #6474
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The new command allows mutation of Intel VMCS fields with the help of vmwrite instruction. In addition to VM ID and field ID, @nested_intel_vmwrite_mask takes three 64-bit numbers: the set mask, the unset mask, and the flip mask. This allows to make bitwise modifications to VMCS without disturbing the execution too much. Also add sys/linux/test/amd64-syz_kvm_nested_vmwrite_mask to test the new command behavior.
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a-nogikh
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Nov 21, 2025
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The new command allows mutation of Intel VMCS fields with the help of vmwrite instruction.
In addition to VM ID and field ID, @nested_intel_vmwrite_mask takes three 64-bit numbers: the set mask, the unset mask, and the flip mask. This allows to make bitwise modifications to VMCS without disturbing the execution too much.
Also add sys/linux/test/amd64-syz_kvm_nested_vmwrite_mask to test the new command behavior.
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https://github.com/google/syzkaller/blob/master/docs/contributing.md