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20 用户空间的内存保护密钥（Memory Protection Keys for Userspace，PKU，亦
11 Pkeys Userspace (PKU) is a feature which can be found on:
735 e1 pku SS_L2RDRD
393 #define X86_FEATURE_PKU (16*32+ 3) /* "pku" Protection Keys for Userspace */
3627 * SMEP/SMAP/PKU is disabled if CPU is in non-paging mode in in vmx_set_cr4()3628 * hardware. To emulate this behavior, SMEP/SMAP/PKU needs in vmx_set_cr4()3635 * disables SMEP/SMAP/PKU when the guest sets CR0.PG=0. in vmx_set_cr4()7882 cr4_fixed1_update(X86_CR4_PKE, ecx, feature_bit(PKU)); in nested_vmx_cr_fixed1_bits_update()
224 0x7, 0, ecx, 3, pku , Protection keys for user-space