I have the same issue. When I open the task manager on the virtualized Windows 10 VM I see the HDD time is at 100% but the data transfer rate is actual 0b/s. I've tried any combination of the options below and the issue was always reproducible with qemu-2.12.0-1 and never with qemu-2.11.1-2.
Linux kernels: - 4.14.5-1 - 4.16.7 Windows 10 Verson (for the VM) - 1709 - 1803 Boot HDD for VM - Actual SSD (/dev/sda) - QCOW2 Image QEMU - qemu-2.11.1-2 - qemu-2.12.0-1 I also use ARCH Linux and have also downgraded to pre 2.12 QEMU -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1769189 Title: Issue with qemu 2.12.0 + UEFI Status in QEMU: New Bug description: (first reported here: https://bugzilla.tianocore.org/show_bug.cgi?id=949 ) I had a Windows 10 VM running perfectly fine with OVMF UEFI, since I upgraded to qemu 2.12, the guests hangs for a couple of minutes, works for a few seconds, and hangs again, etc. By "hang" I mean it doesn't freeze, but it looks like it's waiting on IO or something, I can move the mouse but everything needing disk access is unresponsive. What doesn't work: qemu 2.12 with OVMF What works: using BIOS or downgrading qemu to 2.11.1. Platform is arch linux 4.16.7 on skylake, I have attached the vm xml file. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1769189/+subscriptions
