SYZOS_API_NESTED_AMD_VMCB_WRITE_MASK #6475
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The new command allows mutation of AMD VMCB block with plain 64-bit writes. In addition to VM ID and VMCB offset, @nested_amd_vmcb_write_mask takes three 64-bit numbers: the set mask, the unset mask, and the flip mask. This allows to make bitwise modifications to VMCB without disturbing the execution too much. Also add sys/linux/test/amd64-syz_kvm_nested_amd_vmcb_write_mask to test the new command behavior.
Rename amd64-syz_kvm_nested_vmwrite_mask to amd64-syz_kvm_nested_intel_vmwrite_mask No functional change.
a-nogikh
approved these changes
Nov 21, 2025
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