--- title: Linux Preps IBPB-On-Entry Feature For AMD SEV-SNP Guest VMs description: A patch heading to the mainline Linux kernel enables the IBPB-on-Entry security feature for AMD SEV-SNP guest VMs. Supported by AMD EPYC Zen 5 processors,... canonical: https://daily.dev/posts/linux-preps-ibpb-on-entry-feature-for-amd-sev-snp-guest-vms-4uro3mlas twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Linux Preps IBPB-On-Entry Feature For AMD SEV-SNP Guest VMs | daily.dev og:description: A patch heading to the mainline Linux kernel enables the IBPB-on-Entry security feature for AMD SEV-SNP guest VMs. Supported by AMD EPYC Zen 5 processors,... og:url: https://daily.dev/posts/linux-preps-ibpb-on-entry-feature-for-amd-sev-snp-guest-vms-4uro3mlas og:image: https://api.daily.dev/og/posts/4uRo3mLaS.png og:image:alt: Linux Preps IBPB-On-Entry Feature For AMD SEV-SNP Guest VMs og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Linux Preps IBPB-On-Entry Feature For AMD SEV-SNP Guest VMs **[Phoronix](https://daily.dev/sources/phoronix)** · 2 min read · 0 upvotes · 0 comments ## Summary A patch heading to the mainline Linux kernel enables the IBPB-on-Entry security feature for AMD SEV-SNP guest VMs. Supported by AMD EPYC Zen 5 processors, IBPB-on-Entry forces an Indirect Branch Predictor Barrier when entering a guest VM, helping prevent speculative execution attacks. The feature was previously masked as a reserved bit due to it being added after the initial SNP Zen implementation. The fix is a small code change, targeted at the Linux 7.0 cycle via the x86/urgent branch, and is also marked for back-porting to stable kernel series. ## Full article daily.dev links to this article rather than hosting it. 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