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Neither >> "-cpu host,-pmu" nor "-cpu EPYC" achieves this. >> >> As a result, the following message still appears in the VM dmesg: >> >> [    0.263615] Performance Events: AMD PMU driver. >> >> However, the expected output should be: >> >> [    0.596381] Performance Events: PMU not available due to virtualization, using software events only. >> [    0.600972] NMI watchdog: Perf NMI watchdog permanently disabled >> >> This occurs because AMD does not use any CPUID bit to indicate PMU >> availability. >> >> To address this, KVM_CAP_PMU_CAPABILITY is used to set KVM_PMU_CAP_DISABLE >> when "-pmu" is configured. >> >> Signed-off-by: Dongli Zhang >> Reviewed-by: Xiaoyao Li >> Reviewed-by: Zhao Liu >> Reviewed-by: Dapeng Mi > > This is commit 4f0dd09e61b080c27589fe35b575503783c5a256 (v10.2.0-1114-g4f0dd09e61b) > in the master branch now. > > This change seem to broke booting windows 10/11 on an AMD host, in paticular > with -cpu EPYC-Rome-v4.  It were initially reported in debian qemu bug tracker, > and I verified and bisected the issue on my AMD desktop machine (which is AMD > Ryzen 7 5700G, Zen 3. > > When booting windows11 VM with -cpu EPYC-Rome-v4 -enable-kvm, the > guest enters tight CPU loop while displaying a boot screen, before > it starts showing up the rotating circle (which shows boot progress). > > Before this patch, it boots ok. > > There's no other fancy options, just > >  qemu-system-x86_64 -m 2G -enable-kvm -cpu EPYC-Rome-v4 -smp 2 > > (I'm replying to the original email message with all original recipients, > hope it's okay). > > Can someone please take a look? > What happens if you use "-cpu EPYC-Rome-v4,+pmu"?