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+<think>
+Okay, so I'm trying to classify this bug report about QEMU hanging when an s390x guest boots using a mdev dasd as the boot device. Let me break down what's given here.
+
+The user is running the latest QEMU with kernel 5.3.18. They're using a passthrough DASD (which I think stands for Direct Adaptive Storage Device) as the boot device, and during installation, it seems fine but then the VM hangs after rebooting. They mentioned they've been looking into "s390: vfio-ccw dasd ipl support" without success.
+
+Looking at the logs provided, there are warnings related to vfio-ccw (device fe.0.0000) with a PFCH flag being forced. The test script uses QEMU with s390x architecture, KVM acceleration, and specifies the DASD as the boot device with some global settings.
+
+Now, considering the possible categories: mistranslation, assembly, other, device, graphic, socket, network, KVM, boot, vnc, debug, files, permissions, performance, kernel, peripherals, hypervisor.
+
+The issue is about a guest VM hanging during IPL (Initial Program Load) when using a DASD as the boot device. The warning mentions vfio-ccw and force-orb-pfch, which relates to I/O devices in KVM. Since it's related to hardware passthrough for I/O devices and hangs on boot, this seems more about device handling rather than translation errors or performance.
+
+It's not a mistranslation issue because that would be more about how instructions are mapped. It's also not directly about the kernel but rather the device setup in QEMU. Since it's related to KVM (as specified in the machine type and acceleration), but the specific problem is with the DASD device, which is a peripheral.
+
+So between 'device' and 'peripherals', I think 'device' might be more accurate because it refers to the specific hardware devices being emulated or passed through. Alternatively, 'peripherals' could fit since DASD is an input/output device. But considering that the issue arises during boot with the DASD as the primary boot device and involves vfio-ccw which manages I/O devices in KVM, it's more about device handling.
+
+I'm leaning towards 'device' because it's about how the device (DASD) is being handled by QEMU. However, another thought: maybe 'peripherals' is a better fit since DASD is a peripheral device. The categories list both 'device' and 'peripherals', so I need to determine which is more specific.
+
+Looking at the possible categories again, perhaps 'device' is broader, encompassing all hardware devices, while 'peripherals' might refer specifically to input/output devices like disks, which DASD is. So maybe 'peripherals' is the right category here because it's about a disk device not booting correctly.
+
+Wait, but the user mentioned they're using vfio-ccw for the DASD, which is part of QEMU's handling of I/O devices in KVM. So perhaps the issue is with how the device is being managed by QEMU's device emulation or passthrough.
+
+Alternatively, considering that it's about the boot process failing due to a hardware device issue, maybe 'boot' is also a possibility. But the hang occurs during IPL after installation, which might be more related to the device handling rather than the boot process itself.
+
+I think I'm overcomplicating this. The key here is that the VM hangs when using a DASD as the boot device with vfio-ccw, and it's related to KVM. Since the issue involves hardware devices being used in QEMU/KVM, 'device' seems appropriate because it's about how the device is set up or handled by QEMU.
+
+Alternatively, since it's a specific I/O device (DASD), maybe 'peripherals' is better. But I'm not entirely sure. Wait, looking back at the categories provided: device, graphic, socket, network, KVM, etc. 'Device' might be too broad, but in this case, the problem is with a particular device setup.
+
+Wait, another angle: when you have issues with booting from a specific device, sometimes it's categorized under 'boot', but in this case, the issue seems to be related to how the device is being handled by QEMU, not necessarily the boot process itself. So perhaps 'device' is more accurate.
+
+But I'm still a bit unsure. Maybe looking at similar bugs could help. For example, if it's an issue with vfio-ccw and DASD during boot, it might fall under 'peripherals' since DASD is a storage peripheral. Alternatively, 'boot' because it affects the boot process.
+
+But considering that the user mentioned they're using KVM and vfio-ccw (which deals with I/O devices), the problem lies in how the device is managed, making 'device' or 'peripherals' more suitable.
+
+Wait, looking at the categories again: 'hypervisor' refers to KVM itself. Since the issue isn't with KVM directly but with a device under KVM, it's not hypervisor. So between 'device' and 'peripherals'.
+
+I think I'll go with 'device' because it encapsulates the problem of the DASD device not being handled correctly by QEMU during boot.
+</think>
+
+The issue is related to how the DASD device is handled during boot in a KVM environment, specifically involving vfio-ccw. Therefore, the category is:
+
+device
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