x86/cpufeatures: Make X86_BUG_FXSAVE_LEAK detectable in CPUID on AMD
The latest AMD AMD64 Architecture Programmer's Manual adds a CPUID feature XSaveErPtr (CPUID_Fn80000008_EBX[2]). If this feature is set, the FXSAVE, XSAVE, FXSAVEOPT, XSAVEC, XSAVES / FXRSTOR, XRSTOR, XRSTORS always save/restore error pointers, thus making the X86_BUG_FXSAVE_LEAK workaround obsolete on such CPUs. Signed-off-by: NRudolf Marek <r.marek@assembler.cz> Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Reviewed-by: NBorislav Petkov <bp@suse.de> Tested-by: NBorislav Petkov <bp@suse.de> Cc: Andy Lutomirski <luto@amacapital.net> Link: https://lkml.kernel.org/r/bdcebe90-62c5-1f05-083c-eba7f08b2540@assembler.czSigned-off-by: NIngo Molnar <mingo@kernel.org>
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