{"id":111676,"date":"2023-11-21T15:10:42","date_gmt":"2023-11-21T13:10:42","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-gipervizora-xen-4-18"},"modified":"2023-11-21T15:10:42","modified_gmt":"2023-11-21T13:10:42","slug":"vypusk-gipervizora-xen-4-18","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/vypusk-gipervizora-xen-4-18","title":{"rendered":"Vyd\u00e1n\u00ed hypervizoru Xen 4.18","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Po 11 m\u011bs\u00edc\u00edch v\u00fdvoje byl zve\u0159ejn\u011bn release svobodn\u00e9ho hypervizoru Xen 4.18. Na v\u00fdvoji nov\u00e9 verze se pod\u00edlely takov\u00e9 spole\u010dnosti jako Amazon, Arm, Bitdefender, Citrix, EPAM Systems a AMD. Tvorba aktualizac\u00ed pro v\u011btev Xen 4.18 potrv\u00e1 do 16. kv\u011btna 2025, zat\u00edmco publikace oprav zranitelnost\u00ed potrv\u00e1 do 16. listopadu 2026.      <\/p>\n<p>Kl\u00ed\u010dov\u00e9 zm\u011bny v Xen 4.18:   <\/p>\n<ul>\n<li class=\"l\"> Byly p\u0159id\u00e1ny po\u010d\u00e1te\u010dn\u00ed realizace port\u016f pro architektury RISC-V a Power (ppc64le). Byla rozvinuta prost\u0159ed\u00ed pro testov\u00e1n\u00ed port\u016f RISC-V a Power v syst\u00e9mu kontinu\u00e1ln\u00ed integrace GitLab CI.\n<li class=\"l\"> P\u0159i pr\u00e1ci na syst\u00e9mech ARM64 byly v subsyst\u00e9mu pam\u011bti Xen zohledn\u011bny zvl\u00e1\u0161tnosti architektury ARM. Byla p\u0159id\u00e1na experiment\u00e1ln\u00ed podpora vektorov\u00fdch instrukc\u00ed SVE (Scalable Vector Extension). P\u0159id\u00e1ny n\u00e1stroje Arm Firmware Framework pro architekturu ARM A-profile (ARM Application-profile, FF-A). Byla p\u0159id\u00e1na experiment\u00e1ln\u00ed mo\u017enost dynamick\u00e9ho p\u0159id\u00e1v\u00e1n\u00ed a odstra\u0148ov\u00e1n\u00ed uzl\u016f v za\u0159\u00edzen\u00ed Xen device tree pomoc\u00ed soubor\u016f .dtbo.\n<li class=\"l\"> Na syst\u00e9mech s procesory Intel je parametr MSR_ARCH_CAPS nyn\u00ed viditeln\u00fd v hostitelsk\u00fdch syst\u00e9mech a m\u016f\u017ee b\u00fdt nastaven prost\u0159ednictv\u00edm konfigura\u010dn\u00edho souboru virtu\u00e1ln\u00edho stroje. Na procesorech vydan\u00fdch od roku 2019 umo\u017e\u0148uje parametr MSR_ARCH_CAPS zjistit, jak\u00e9 byly pou\u017eity hardwarov\u00e9 opravy zranitelnost\u00ed spojen\u00fdch se spekulativn\u00edm vykon\u00e1v\u00e1n\u00edm operac\u00ed.\n<li class=\"l\"> Byla p\u0159id\u00e1na podpora roz\u0161\u00ed\u0159en\u00ed CPUID_USER_DIS (CPUID Faulting), p\u0159idan\u00e9ho ve \u010dtvrt\u00e9 generaci procesor\u016f AMD EPYC pro \u0159\u00edzen\u00ed mo\u017enosti zobrazen\u00ed dat CPUID z paravirtu\u00e1ln\u00edho hostitelsk\u00e9ho syst\u00e9mu.\n<li class=\"l\"> Byla p\u0159id\u00e1na podpora roz\u0161\u00ed\u0159en\u00ed, kter\u00e1 se objevila u procesor\u016f Intel na b\u00e1zi mikroarchitektury Sapphire Rapids:\n<ul>\n<li class=\"l\"> Pro hostitelsk\u00e9 syst\u00e9my v re\u017eimu HVM a PVH byla p\u0159id\u00e1na podpora mechanismu PKS (Protection Key Supervisor), kter\u00fd roz\u0161i\u0159uje mo\u017enosti ochrany str\u00e1nek pam\u011bti.\n<li class=\"l\"> Aby se p\u0159ede\u0161lo havarijn\u00edmu zastaven\u00ed cel\u00e9ho syst\u00e9mu v p\u0159\u00edpad\u011b probl\u00e9m\u016f s mikroarchitektonick\u00fdmi z\u00e1mky, byl zapojen mechanismus VM-Notify.\n<li class=\"l\"> Byla p\u0159id\u00e1na ochrana proti vzniku blok\u00e1dy sb\u011brnice v d\u016fsledku nec\u00edlen\u00e9ho pou\u017e\u00edv\u00e1n\u00ed atomick\u00fdch instrukc\u00ed v hostitelsk\u00e9m syst\u00e9mu (zapnuto rate-limit).    <\/ul>\n<li class=\"l\"> Byla p\u0159id\u00e1na podpora instrukc\u00ed AVX512-FP16, kter\u00e9 se objevily v procesorech Intel na b\u00e1zi mikroarchitektury Granite Rapids.\n<li class=\"l\"> Byl p\u0159id\u00e1n ovlada\u010d cpufreq, kter\u00fd vyu\u017e\u00edv\u00e1 mechanismus HWP (Hardware P-States) pro \u0159\u00edzen\u00ed spot\u0159eby a frekvence procesor\u016f Intel.\n<li class=\"l\"> Byla implementov\u00e1na podpora pro nucen\u00e9 prov\u00e1d\u011bn\u00ed syst\u00e9mov\u00fdch operac\u00ed v re\u017eimu DOITM (Data Operand Independent Timing Mode), co\u017e zaji\u0161\u0165uje konstantn\u00ed \u010das prov\u00e1d\u011bn\u00ed instrukc\u00ed, nez\u00e1visl\u00fd na datech zpracov\u00e1van\u00fdch v t\u011bchto instrukc\u00edch.\n<li class=\"l\"> Pokra\u010duje se v realizaci po\u017eadavk\u016f na v\u00fdvoj bezpe\u010dn\u00fdch a spolehliv\u00fdch program\u016f v jazyce C, formulovan\u00fdch ve specifikac\u00edch MISRA-C pro kritick\u00e9 syst\u00e9my. Po\u010det zaveden\u00fdch direktiv MISRA-C v Xen se zv\u00fd\u0161il z 4 na 6 a pravidel z 24 na 65 (ve specifikaci je celkem 16 direktiv a 143 pravidel).\n<li class=\"l\"> V n\u00e1stroj\u00edch xl\/libxl byla p\u0159id\u00e1na mo\u017enost zm\u011bny nastaven\u00ed SMBIOS pro hostitelsk\u00e9 syst\u00e9my v re\u017eimu HVM.\n<li class=\"l\"> Byly p\u0159id\u00e1ny dva nov\u00e9 hypervol\u00e1n\u00ed pro sv\u00e1z\u00e1n\u00ed pracovn\u00edho stavu a \u010dasov\u00fdch oblast\u00ed vCPU s fyzick\u00fdmi, nikoli virtu\u00e1ln\u00edmi adresami.          <\/ul>\n<p>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=60153\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 11 \u043c\u0435\u0441\u044f\u0446\u0435\u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0440\u0435\u043b\u0438\u0437 \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u0433\u0438\u043f\u0435\u0440\u0432\u0438\u0437\u043e\u0440\u0430 Xen 4.18. \u0412 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u043d\u043e\u0432\u043e\u0433\u043e \u0432\u044b\u043f\u0443\u0441\u043a\u0430 \u043f\u0440\u0438\u043d\u044f\u043b\u0438 \u0443\u0447\u0430\u0441\u0442\u0438\u0435 \u0442\u0430\u043a\u0438\u0435 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438, \u043a\u0430\u043a Amazon, Arm, Bitdefender, Citrix, EPAM Systems \u0438 AMD. \u0424\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0439 \u0434\u043b\u044f \u0432\u0435\u0442\u043a\u0438 Xen 4.18 \u043f\u0440\u043e\u0434\u043b\u0438\u0442\u0441\u044f \u0434\u043e 16 \u043c\u0430\u044f 2025 \u0433\u043e\u0434\u0430, \u0430 \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u044f \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0434\u043e 16 \u043d\u043e\u044f\u0431\u0440\u044f 2026 \u0433\u043e\u0434\u0430. \u041a\u043b\u044e\u0447\u0435\u0432\u044b\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0432 Xen 4.18: \u0414\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u044b \u043d\u0430\u0447\u0430\u043b\u044c\u043d\u044b\u0435 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-111676","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - 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