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>>> + >>> + /* >>> + * Run only on BSP and not during resume to report the capability only once. >>> + */ >>> + if ( system_state == SYS_STATE_resume || smp_processor_id() ) >>> + return; >>> + >>> + printk("CPU: SMX capability "); >>> + if ( !test_bit(X86_FEATURE_SMX, &boot_cpu_data.x86_capability) ) >>> + { >>> + printk("not supported\n"); >>> + return; >>> + } >>> + printk("supported\n"); >>> + >>> + /* Can't run GETSEC without VMX and SMX */ >>> + if ( !test_bit(X86_FEATURE_VMX, &boot_cpu_data.x86_capability) ) >>> + return; >>> + >>> + cr4_val = read_cr4(); >>> + if ( !(cr4_val & X86_CR4_SMXE) ) >>> + write_cr4(cr4_val | X86_CR4_SMXE); >>> + >>> + asm volatile ("getsec\n" >>> + : "=a" (getsec_caps) >>> + : "a" (GETSEC_CAPABILITIES), "b" (0) :); >> Nit (style): Bad indentation, missing blanks, unnecessary \n, and stray colon. >> Overall: >> >> asm volatile ( "getsec" >> : "=a" (getsec_caps) >> : "a" (GETSEC_CAPABILITIES), "b" (0) ); >> >> I further question the need for volatile here. (Like for we have for CPUID, we >> anyway may want to gain a getsec() wrapper for GETSEC.) > I think `volatile` was added just because it doesn't hurt, rather than > because it's necessary, so it can be dropped. Can add a wrapper, but > there is only one use so far and a generic wrapper will have to use > 64-bit parameters (`GETSEC[EXITAC]` sets RBX). GETSEC is a horrible instruction.  The different functions (eax input) produce and consume different registers, This in turn requires different volatilities.  GETSEC[CAPABILITIES] and GETSEC[PARAMETERS] should be non-volatile (they're read-only operation without interesting side effects which the optimiser can safely discard) whereas GETSEC[ENTERACCS] or GETSEC[SENTER] are really "jump into new processor mode".  They're both longjmp-like so are considered volatile by virtue of having no outputs. I was going to request a getsec.h header to abstract these away.  Having more than one location where we need to carefully check the asm constraints against the SDM is too many. ~Andrew