Messages in this thread | | | Date | Tue, 30 Jun 2015 13:19:07 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH 2/3] x86, perf: Support custom test values for extra_regs |
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On Mon, Jun 29, 2015 at 02:22:14PM -0700, Andi Kleen wrote: > From: Andi Kleen <ak@linux.intel.com> > > Current kernels always test extra registers at boot with RMW > cycle, to catch lying virtual machines. > > For a new register the standard 0x1ff test value does not work, > as 0x1ff is not a valid value and causes an #GP. > > Add the ability to add custom test values to an extra_reg > into the description tables.
Just wondering; is there not a test value that works for all registers?
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