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Add a working xstate data structure for the usage of AMX and potential future usage on other xstate components. AMX selftest requires checking both the xstate_bv and xcomp_bv. Existing code relies on pointer arithmetics to fetch xstate_bv and does not support xcomp_bv. So, add a working xstate data structure into processor.h for x86. Suggested-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Mingwei Zhang <mizhang@google.com> Link: https://lore.kernel.org/r/20230221163655.920289-3-mizhang@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>