Messages in this thread | | | Subject | Re: [tip:x86/mm] x86/mm: Add support for early encryption/decryption of memory | From | Dave Hansen <> | Date | Wed, 25 Oct 2017 10:34:57 -0700 |
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On 07/18/2017 03:51 AM, tip-bot for Tom Lendacky wrote: > +/* > + * This routine does not change the underlying encryption setting of the > + * page(s) that map this memory. It assumes that eventually the memory is > + * meant to be accessed as either encrypted or decrypted but the contents > + * are currently not in the desired state. > + * > + * This routine follows the steps outlined in the AMD64 Architecture > + * Programmer's Manual Volume 2, Section 7.10.8 Encrypt-in-Place. > + */ > +static void __init __sme_early_enc_dec(resource_size_t paddr, > + unsigned long size, bool enc) > +{ > + void *src, *dst; > + size_t len; > + > + if (!sme_me_mask) > + return; > + > + local_flush_tlb(); > + wbinvd();
What is this TLB flush for? WBINVD is mentioned in "Volume 2, Section 7.10.8", but TLB flushes are not. Is it OK that this does not flush global pages?
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