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authorChristian Krinitsin <mail@krinitsin.com>2025-07-03 07:27:52 +0000
committerChristian Krinitsin <mail@krinitsin.com>2025-07-03 07:27:52 +0000
commitd0c85e36e4de67af628d54e9ab577cc3fad7796a (patch)
treef8f784b0f04343b90516a338d6df81df3a85dfa2 /results/classifier/gemma3:12b/hypervisor/2669
parent7f4364274750eb8cb39a3e7493132fca1c01232e (diff)
downloademulator-bug-study-d0c85e36e4de67af628d54e9ab577cc3fad7796a.tar.gz
emulator-bug-study-d0c85e36e4de67af628d54e9ab577cc3fad7796a.zip
add deepseek and gemma results
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+CPU Hotplug (Host Model) Causes the Windows VM to BSOD
+Description of problem:
+The QEMU runs on a host with the Intel(R) Xeon(R) CPU E3-1230 v6 CPU which supports Software Guard Extension (SGX). I start a VM with Windows Server 2019 inside and with `-cpu host,...`. When I attempts to hotplug additional CPU (when the VM is running), the OS issues a bug check 0x3e (`MULTIPROCESSOR_CONFIGURATION_NOT_SUPPORTED`). The problem is that the newly hotplugged CPU is not evaluated as "equivalent enough" compared to the already present CPUs. I did some more digging and reverse engineering and it looks like the CPU being hotplugged has SGX turned off. This seems to be fixed when the VM reboots.
+
+I tried to disable SGX through `-cpu host,-sgx` which helps (the VM successfully accepts the hotplugged CPU), however, `+sgx` does not help (seems to have no effect on the CPU being hotplugged).
+
+My goal is to be able to hotplug CPUs even when the host CPU supports SGX.
+
+I tested with QEMU 8.0.0, 9.1.0, 9.1.1 and 9.1.50 (current master) but with no luck.
+Steps to reproduce:
+1. Create a simple Windows VM,
+2. start the VM,
+3. use `qpm-shell` to hotplug a CPU (https://www.qemu.org/docs/master/system/cpu-hotplug.html).
+
+I can provide you the VM as well but its image (QCOW2) has around 10G in size.
+
+Best regards
+Martin DrĂ¡b