--- title: AMD EPYC Zen 6 PML Support, ARM64 On s390 Merged For... description: Linux 7.4's KVM code merges several server virtualization features. It adds initial ARM64 on IBM s390/Z support. AMD EPYC Zen 6 processors gain Page... canonical: https://daily.dev/posts/amd-epyc-zen-6-pml-support-arm64-on-s390-merged-for-linux-7-4-kvm-bzxnuxsmd twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: AMD EPYC Zen 6 PML Support, ARM64 On s390 Merged For Linux 7.4 KVM | daily.dev og:description: Linux 7.4's KVM code merges several server virtualization features. It adds initial ARM64 on IBM s390/Z support. AMD EPYC Zen 6 processors gain Page... og:url: https://daily.dev/posts/amd-epyc-zen-6-pml-support-arm64-on-s390-merged-for-linux-7-4-kvm-bzxnuxsmd og:image: https://api.daily.dev/og/posts/bzxNuxSmD.png og:image:alt: AMD EPYC Zen 6 PML Support, ARM64 On s390 Merged For Linux 7.4 KVM 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. # AMD EPYC Zen 6 PML Support, ARM64 On s390 Merged For Linux 7.4 KVM **[Phoronix](https://daily.dev/sources/phoronix)** · 2 min read · 0 upvotes · 0 comments ## Summary Linux 7.4's KVM code merges several server virtualization features. It adds initial ARM64 on IBM s390/Z support. AMD EPYC Zen 6 processors gain Page Modification Logging for hardware-assisted dirty memory tracking, enabled by default on capable chips. Intel gets Instruction Timeout support (formerly Notify VM-Exit) and Bus Lock VM Exit. ARM also adds pKVM state isolation and more confidential compute work, while AMD adds Bus Lock Detect virtualization on SVM. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What is Page Modification Logging support for AMD EPYC Zen 6 in KVM? Page Modification Logging (PML) brings hardware-assisted dirty logging to KVM guests running on AMD EPYC Zen 6 processors, tracking guest-modified memory pages. It is enabled by default on capable EPYC Zen 6 server processors as part of the KVM changes merged for Linux kernel 7.4. _Teams planning EPYC Zen 6 deployments can follow kernel virtualization updates like this on daily.dev._ ### What does Intel Instruction Timeout support do in KVM on Linux 7.4? Intel Instruction Timeout, formerly called Notify VM-Exit, is a KVM security feature added in Linux 7.4 that mitigates denial of service attacks against servers running TDX-protected virtual machines. It addresses a scenario where a malicious guest VM blocks interrupt or event handling to starve host resources or lock up a CPU core. _Engineers hardening TDX virtualization deployments can track kernel security mitigations like this via daily.dev._ ### Does Linux KVM support running ARM64 virtual machines on IBM Z (s390) hardware? Yes, initial ARM64 on s390 support merged into the mainline kernel for Linux 7.4, building on IBM and Arm's dual-architecture hardware collaboration and earlier virtualization acceleration patches for IBM Z servers. Further improvements are expected in subsequent kernel release cycles. _Anyone evaluating cross-architecture virtualization on IBM Z can keep up with kernel progress through daily.dev._ ## Similar posts on daily.dev - [Linux 7.4 Fixes AMD CPU TLB Size Reporting For Zen 5 & Newer](https://daily.dev/posts/linux-7-4-fixes-amd-cpu-tlb-size-reporting-for-zen-5-newer-hdvnshfkm) · Phoronix · 0 upvotes · 0 comments - [IBM Updates Linux Patches For Introducing ARM64 KVM Virtualization On s390](https://daily.dev/posts/ibm-updates-linux-patches-for-introducing-arm64-kvm-virtualization-on-s390-h3qzcbfyu) · Phoronix · 0 upvotes · 0 comments - [Linux 7.1 KVM Adds "Very Experimental" Support For pKVM Protected Guests](https://daily.dev/posts/linux-7-1-kvm-adds-very-experimental-support-for-pkvm-protected-guests-dq4sdbdoa) · Phoronix · 0 upvotes · 0 comments - [Notable Intel & AMD CPU Changes Merged For Linux 7.0-rc3](https://daily.dev/posts/notable-intel-amd-cpu-changes-merged-for-linux-7-0-rc3-2zqyq4v66) · Phoronix · 0 upvotes · 0 comments --- Tags: [#linux](https://daily.dev/tags/linux), [#infrastructure](https://daily.dev/tags/infrastructure), [#hardware](https://daily.dev/tags/hardware) [View this post on daily.dev](https://daily.dev/posts/amd-epyc-zen-6-pml-support-arm64-on-s390-merged-for-linux-7-4-kvm-bzxnuxsmd) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"AMD EPYC Zen 6 PML Support, ARM64 On s390 Merged For Linux 7.4 KVM","url":"https://daily.dev/posts/amd-epyc-zen-6-pml-support-arm64-on-s390-merged-for-linux-7-4-kvm-bzxnuxsmd","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/amd-epyc-zen-6-pml-support-arm64-on-s390-merged-for-linux-7-4-kvm-bzxnuxsmd"},"datePublished":"2026-10-27T12:02:26.237Z","dateModified":"2026-10-27T12:02:56.999Z","description":"Linux 7.4's KVM code merges several server virtualization features. 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It is enabled by default on capable EPYC Zen 6 server processors as part of the KVM changes merged for Linux kernel 7.4. Teams planning EPYC Zen 6 deployments can follow kernel virtualization updates like this on daily.dev."}},{"@type":"Question","name":"What does Intel Instruction Timeout support do in KVM on Linux 7.4?","acceptedAnswer":{"@type":"Answer","text":"Intel Instruction Timeout, formerly called Notify VM-Exit, is a KVM security feature added in Linux 7.4 that mitigates denial of service attacks against servers running TDX-protected virtual machines. It addresses a scenario where a malicious guest VM blocks interrupt or event handling to starve host resources or lock up a CPU core. 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