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[Qemu-devel] [Bug 1829498] Re: window 8 stuck during boot on Qemu

From: John Snow
Subject: [Qemu-devel] [Bug 1829498] Re: window 8 stuck during boot on Qemu
Date: Tue, 21 May 2019 19:25:50 -0000

Drats, okay. I will investigate. (I can always hope for the easy

** Changed in: qemu
     Assignee: (unassigned) => John Snow (jnsnow)

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  window 8 stuck during boot on Qemu

Status in QEMU:

Bug description:
  Description of problem:
  I've got windows 8 image(64 bit), installed on Qemu(x86-64_softmmu) and then 
i'm trying to boot/shutdown it in the same Qemu configuration. Windows 8 has 
feature - when you click "Shutdown" in UI, windows 8 doesn't actually power 
off, it goes to "Suspend to disc" ACPI state. After shutdown, i'm trying to 
boot it again, but it stucks during boot.

  I've discovered, that it hangs when windows 8 writes to AHCI's command 
register, AHCI triggers irq, but windows 8 sends EOI, don't accessing AHCI 
register,so irq line stills in high state, and irq will be injected again and 
again, while windows will send EOI on each AHCI interrupt. Strange thing is 
that it happens only on TCG mode or 
  with option "kernel-irqchip=off/split", with "kernel-irqchip=on" everything 
works ok(windows 8 accesses AHCI register and line goes to low state).

  Version-Release number of selected component (if applicable):
  Qemu revision: d8276573da58e8ce78dab8c46dd660efd664bcb7

  Steps to Reproduce:
  1. Install Windows 8 on QEMU(qemu command line: "-enable-kvm -m 1G -hda 
<image>  -serial stdio  -cpu core2duo -machine q35,kernel-irqchip=off"
  2. Click shutdown in UI.
  3. Try to boot again(it will stuck)
  4. Kill Qemu and boot again, it will boot, now go to 2) :)

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