Messages in this thread | | | Date | Thu, 25 Jul 2019 09:46:31 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH] perf/x86: Apply more accurate check on hypervisor platform |
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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.duan@oracle.com> > Cc: Peter Zijlstra <peterz@infradead.org> > Cc: Arnaldo Carvalho de Melo <acme@kernel.org> > Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> > Cc: Jiri Olsa <jolsa@redhat.com> > Cc: Namhyung Kim <namhyung@kernel.org> > Cc: Thomas Gleixner <tglx@linutronix.de> > Cc: Ingo Molnar <mingo@redhat.com> > Cc: Borislav Petkov <bp@alien8.de> > Cc: Juergen Gross <jgross@suse.com> > Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Thanks!
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