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AMD Zen 2 introduces a new RDPRU instruction which is used to give access to some processor registers that are typically only accessible when the privilege level is zero. ECX is used as the implicit register to specify which register to read. RDPRU places the specified register’s value into EDX:EAX. For example, the RDPRU instruction can be used to read MPERF and APERF at CPL > 0. Add the feature bit so it is visible in /proc/cpuinfo. Details are available in the AMD64 Architecture Programmer’s Manual: https://www.amd.com/system/files/TechDocs/24594.pdf Signed-off-by: Babu Moger <babu.moger@amd.com> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: Aaron Lewis <aaronlewis@google.com> Cc: ak@linux.intel.com Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org> Cc: robert.hu@linux.intel.com Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Thomas Hellstrom <thellstrom@vmware.com> Cc: x86-ml <x86@kernel.org> Link: https://lkml.kernel.org/r/20191007204839.5727.10803.stgit@localhost.localdomain |
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