[Bug 213155] possible kernel regression when running 11.x-RELEASE on KVM on AMD Opterons

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213155

--- Comment #24 from Oliver Böttcher <marvin0815 at gmail.com> ---
(In reply to Martin Waschbüsch from comment #23)
> When you say that "enabling all features and model=qemu64 booted", does that include xsave?

Yes. The long snippet exposes all features of Opteron_G5 including xsave. The
only difference I see is that the CPU is reported as QEMU Virtual CPU version
2.5+.

My ultimately wild guess is that FreeBSD is doing some optimizations based on
the reported CPU like workarounds for bugs which is necessary for bare metal
but crashes virtualized environments not having these bugs.

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