On Mon, Sep 25, 2017 at 12:44:52PM +0800, Wei Wang wrote: > This patch series enables the Last Branch Recording feature for the > guest. Instead of trapping each LBR stack MSR access, the MSRs are > passthroughed to the guest. Those MSRs are switched (i.e. load and > saved) on VMExit and VMEntry. > > Test: > Try "perf record -b ./test_program" on guest. I don't see where you expose the PERF capabilities MSR? That's normally needed for LBR too to report the version number. -Andi
