On Thu, Jul 25, 2019 at 10:39:26AM +0800, Zhenzhong Duan wrote:
> check_msr is used to fix a bug report in guest where KVM doesn't support
> LBR MSR and cause #GP.
>
> The msr check is bypassed on real HW to workaround a false failure,
> see commit d0e1a507bdc7 ("perf/x86/intel: Disable check_msr for real HW")
>
> When running a guest with CONFIG_HYPERVISOR_GUEST not set or "nopv"
> enabled, current check isn't enough and #GP could trigger.
>
> Signed-off-by: Zhenzhong Duan <zhenzhong.d...@oracle.com>
> Cc: Peter Zijlstra <pet...@infradead.org>
> Cc: Arnaldo Carvalho de Melo <a...@kernel.org>
> Cc: Alexander Shishkin <alexander.shish...@linux.intel.com>
> Cc: Jiri Olsa <jo...@redhat.com>
> Cc: Namhyung Kim <namhy...@kernel.org>
> Cc: Thomas Gleixner <t...@linutronix.de>
> Cc: Ingo Molnar <mi...@redhat.com>
> Cc: Borislav Petkov <b...@alien8.de>
> Cc: Juergen Gross <jgr...@suse.com>
> Cc: Boris Ostrovsky <boris.ostrov...@oracle.com>
Thanks!
