Fix ARM64 virtio-gpu multi-window command buffer corruption#382
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Mirror Linux's per-command virtio-gpu vbuffer lifetime for active present-path commands and construct TRANSFER_TO_HOST_3D directly in owned DMA storage so stack source corruption cannot turn display dimensions or vertex data into control headers. Validation: cargo build --release --target aarch64-breenix.json -Z build-std=core,alloc -Z build-std-features=compiler-builtins-mem -p kernel --bin kernel-aarch64; Parallels default boot clean; Parallels bterm/btop+Bounce multi-window gate clean with no VIRTGPU_FAIL. Co-authored-by: Claude Code <noreply@anthropic.com>
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Summary
00000500 000003c0...).Validation
cargo build --release --target aarch64-breenix.json -Z build-std=core,alloc -Z build-std-features=compiler-builtins-mem -p kernel --bin kernel-aarch64.VIRTGPU_FAIL, no lockup/panic scan hits, FPS roughly 100-240, BWM not top CPU.VIRTGPU_FAIL, no lockup/panic scan hits, FPS roughly 180-220.Artifacts
/Users/wrb/Downloads/Ralph/breenix-interrupt-io-roadmap-1780056222/turn47-artifacts/four-point-probe-serial.log/Users/wrb/Downloads/Ralph/breenix-interrupt-io-roadmap-1780056222/turn47-artifacts/direct-transfer-candidate-serial.log/Users/wrb/Downloads/Ralph/breenix-interrupt-io-roadmap-1780056222/turn47-artifacts/default-candidate-serial.log/Users/wrb/Downloads/Ralph/breenix-interrupt-io-roadmap-1780056222/turn47-artifacts/direct-transfer-final.diff