Messages in this thread | | | Date | Tue, 30 Jun 2015 08:44:51 -0700 | From | Andi Kleen <> | Subject | Re: [PATCH 2/3] x86, perf: Support custom test values for extra_regs |
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On Tue, Jun 30, 2015 at 01:19:07PM +0200, Peter Zijlstra wrote: > 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?
0x11 will likely work everywhere.
-Andi
-- ak@linux.intel.com -- Speaking for myself only
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