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id = 477
title = "Nested kvm-svm does not work since f5cc5a5c16"
state = "closed"
created_at = "2021-07-13T05:00:08.959Z"
closed_at = "2021-07-24T13:25:38.002Z"
labels = ["Regression", "accel: KVM", "kind::Bug", "workflow::In Progress"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/477"
host-os = "Debian 10"
host-arch = "x86_64"
qemu-version = "6.0.50"
guest-os = "Debian Linux"
guest-arch = "x86_64"
description = """Nested SVM virtualization seems to not work. I bisected this to f5cc5a5c16."""
reproduce = """1. Boot up a Linux guest such as the Debian Live CD with -accel kvm -cpu host
2. ```dmesg | grep kvm; ls /dev/kvm```; # Shows that KVM is disabled within the guest"""
additional = """Details about my AMD host:
```
model name : AMD Ryzen 5 2600 Six-Core Processor
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb hw_pstate sme ssbd sev ibpb vmmcall fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap clflushopt sha_ni xsaveopt xsavec xgetbv1 xsaves clzero irperf xsaveerptr arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif overflow_recov succor smca
```"""
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