Hi, As I can't find any related bug reports in the archives, I'll try to ask here instead: Is it a know issue/bug that qemu-kvm using a -cpu argument with an architecture newer than "core2duo" will cause BSOD during Windows 10 upgrading, and during installation of some Windows updates? On my Hashwell-based host, I tried for days to upgrade a Windows 7.x VM to Windows 10 without receiving a BSOD. In the end I identified various forums posts recommending that the "core2duo" was the latest CPU architecture in qemu-kvm compatible with Windows 10. I changed the -cpu argument to "core2duo", after which the BSOD in the installer disappeared. Once upgrading was successful, I changed the -cpu argument back to "host" and Windows 10 has been running perfectly since then - or at least I thought so, until I looked into why a new Windows Update never installed. The first major update to Windows 10, the "Windows 10 November update" aka. "Version 1511 (OS Build 10586)" [1] cannot install on my Haswell host without changing the CPU-architecture back to the "core2duo" architecture. The host is an up-to-date CentOS 7.2 with qemu-kvm-1.5.3-105.el7_2.3.x86_64 and kernel-3.10.0-327.10.1.el7.x86_64 and a Haswell i5-4570 CPU. When the CPU architecture is set to "host", installation of the update fails with a BSOD with the description: "The installation failed in the SAFE_OS phase with an error during BOOT operation". Changing the -cpu argument to "core2duo" fixed the BSOD and the update installs successfully. I'll be happy to perform further testing if needed, in case someone wants to improve Windows 10 compatibility - I have a backup of the VM from before and after the update. It will likely also be possible to reproduce the issue by simply installing the initial Windows 10 release and updating it with the Windows 10 November release (it can be forced by the Upgrade-function in the Microsoft media creation tool) on a Haswell host using the "-cpu host" argument for qemu-kvm. Thank you in advance... Best regards Kenni [1] http://arstechnica.com/information-technology/2015/11/windows-10-november-update-features-fixes-and-enterprise-readiness/ -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
