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Disable the HVF in-kernel irqchip for Windows 11 on macOS and document why

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With the HVF in-kernel GICv3, QEMU's usb-storage races on the status packet
and Windows Setup stalls 10 s after every burst of reads when installing from
the ISO (utmapp/UTM#7970). Use the emulated interrupt controller until
upstream QEMU gets the fix from the UTM fork. Record the investigation in
windows11-arm64-install-speed.md.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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guofangandClaude Sonnet 5.5 committed 2026-10-23 23:17:55 +08:00
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qemu/windows11-darwin-arm64.ini
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@@ -7,8 +7,13 @@
[accel]
accel = "tcg"
# With the HVF in-kernel GICv3, QEMU's usb-storage races on the status packet
# and Windows Setup stalls 10 s after every burst of reads (utmapp/UTM#7970),
# so use the emulated interrupt controller; upstream QEMU only gets the fix
# from the UTM fork.
[machine]
type = "virt"
kernel-irqchip = "off"
# The "virt" machine has no IDE. NVMe and USB mass storage (used by the
# installation media of --install-from-iso) both have inbox Windows drivers.