{"id":148860,"date":"2025-11-19T17:11:54","date_gmt":"2025-11-19T15:11:54","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-gipervizora-xen-4-21"},"modified":"2025-11-19T17:11:54","modified_gmt":"2025-11-19T15:11:54","slug":"vypusk-gipervizora-xen-4-21","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/vypusk-gipervizora-xen-4-21","title":{"rendered":"Vydanie hyperv\u00edzora Xen 4.21","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Po 8 mesiacoch v\u00fdvoja bol zverejnen\u00fd release vo\u013en\u00e9ho hyperv\u00edzora Xen 4.21. Na v\u00fdvoji novej verzie sa podie\u013eali tak\u00e9 spolo\u010dnosti ako Amazon, Arm, EPAM Systems a AMD. K\u00f3d projektu je nap\u00edsan\u00fd v jazyku C a je \u0161\u00edren\u00fd pod licenciou GPLv2+. V\u00fdvoj prebieha v r\u00e1mci organiz\u00e1cie Linux Foundation.      <\/p>\n<p>K\u013e\u00fa\u010dov\u00e9 zmeny v Xen 4.21:   <\/p>\n<ul>\n<li class=\"l\"> Zabezpe\u010den\u00e1 pln\u00e1 podpora modelu zariaden\u00ed Linux stubdomain, ktor\u00fd umo\u017e\u0148uje organizova\u0165 vykon\u00e1vanie komponentov pre emul\u00e1ciu zariaden\u00ed pod samostatn\u00fdm nepou\u017e\u00edvate\u013esk\u00fdm \u00fa\u010dtom. Model Linux stubomains bol vyvinut\u00fd projektom QUBES OS a podporuje pou\u017e\u00edvanie emula\u010dn\u00fdch ovl\u00e1da\u010dov z najnov\u0161\u00edch vydan\u00ed QEMU, ako aj dostupn\u00fdch funkci\u00ed v QEMU pre hostite\u013esk\u00e9 syst\u00e9my.\n<li class=\"l\"> Zmeny pre syst\u00e9my na b\u00e1ze architekt\u00fary x86:\n<ul>\n<li class=\"l\"> Pridan\u00e1 podpora nov\u00e9ho algoritmu kompresie \u0161trukt\u00fary PDX (Page inDeX), ktor\u00fd umo\u017e\u0148uje zlep\u0161i\u0165 v\u00fdkon Xen na procesoroch Intel Sierra Forest a Granite Rapids pri neline\u00e1rnom zobrazen\u00ed fyzickej pam\u00e4te (sparse memory map), ktor\u00e9 umo\u017e\u0148uje existenciu pr\u00e1zdnych oblast\u00ed.\n<li class=\"l\"> Pridan\u00e1 mo\u017enos\u0165 kontrolova\u0165 atrib\u00fat cacheovania v MTRR (Memory Type Range Registers) pre register BAR (Base Address Register) z\u00e1kladn\u00e9ho PCI zariadenia platformy Xen, ktor\u00e9 pou\u017e\u00edvaj\u00fa hostite\u013esk\u00e9 syst\u00e9my v re\u017eime HVM. Predvolene je v MTRR pre odrazen\u00fa pam\u00e4\u0165 PCI zariaden\u00ed nastaven\u00fd atrib\u00fat UC (uncacheable), ktor\u00fd je v\u00fdznamn\u00fd pre skuto\u010dn\u00e9 PCI zariadenia, ale zni\u017euje v\u00fdkon PCI zariadenia platformy Xen.\n<li class=\"l\"> Pre procesory AMD bol pridan\u00fd nov\u00fd ovl\u00e1da\u010d amd-cppc\/amd-cppc-epp, ktor\u00fd riadi zmenu frekvencie CPU na dosiahnutie optimalizovan\u00e9ho v\u00fdkonu. Ovl\u00e1da\u010d vyu\u017e\u00edva mechanizmus CPPC (Collaborative Processor Performance Control), ktor\u00fd na rozdiel od acpi-cpufreq nie je obmedzen\u00fd na tri \u00farovne v\u00fdkonu a umo\u017e\u0148uje r\u00fdchlej\u0161ie reagova\u0165 na zmenu stavu.\n<li class=\"l\"> Vo variantu vrstvy xenstore-stubdom, pou\u017e\u00edvan\u00e9ho na spustenie xenstored bez privilegi\u00ed Dom0, bola pre paravirtualizovan\u00e9 prostredia v re\u017eime PVH implementovan\u00e1 podpora live-aktualiz\u00e1cie.\n<li class=\"l\"> Pre Dom0 v re\u017eime PVH bola implementovan\u00e1 podpora technol\u00f3gie Resizable BAR (Resizable Base Address Register), ktor\u00e1 umo\u017e\u0148uje pr\u00edstup ku v\u0161etkej pam\u00e4ti zariadenia PCI Express naraz, a nie len v s\u00favislosti s blokmi.\n<li class=\"l\"> Bola implementovan\u00e1 mo\u017enos\u0165 prenosu PCI zariaden\u00ed do prostred\u00ed domU v re\u017eime HVM (pln\u00e1 hardv\u00e9rov\u00e1 virtualiz\u00e1cia) v konfigur\u00e1ci\u00e1ch, kde dom0 funguje v re\u017eime PVH (hybridn\u00e1 hardv\u00e9rov\u00e1 virtualiz\u00e1cia a paravirtualiz\u00e1cia).  <\/ul>\n<li class=\"l\"> Zmeny pre syst\u00e9my na b\u00e1ze architekt\u00fary ARM:\n<ul>\n<li class=\"l\"> Pridan\u00e1 mo\u017enos\u0165 aktiv\u00e1cie mechanizmu ochrany z\u00e1sobn\u00edka (kompil\u00e1cia s flagom &#171;-fstack-protector&#187;), ktor\u00fd je zalo\u017een\u00fd na prid\u00e1van\u00ed kan\u00e1rkov\u00fdch zna\u010diek do z\u00e1sobn\u00edka \u2014 n\u00e1hodn\u00fdch sekvenci\u00ed. V pr\u00edpade prete\u010denia vyrovn\u00e1vacej pam\u00e4te po\u010das zneu\u017e\u00edvania zranite\u013enosti sa kan\u00e1rkov\u00e1 zna\u010dka prep\u00ed\u0161e in\u00fdmi \u00fadajmi, \u010do sp\u00f4sob\u00ed aktiv\u00e1ciu nasleduj\u00facej kontroly nemennosti zna\u010dky a spustenie n\u00fadzov\u00e9ho ukon\u010denia aplik\u00e1cie.\n<li class=\"l\"> Bola pridan\u00e1 podpora mechanizmu eSPI (Extended Shared Peripheral Interrupts), poskytovan\u00e9ho ovl\u00e1da\u010dmi preru\u0161enia GICv3.1.\n<li class=\"l\"> Bola implementovan\u00e1 spracovanie SMMU (System Memory Management Unit) pri prenose zariaden\u00ed PCIe.\n<li class=\"l\"> Bola pridan\u00e1 podpora hostite\u013esk\u00fdch ovl\u00e1da\u010dov PCI pou\u017e\u00edvan\u00fdch vo \u0161tvrtom generation SoC Renesas R-Car.\n<li class=\"l\"> Bola pridan\u00e1 z\u00e1kladn\u00e1 podpora procesorov Cortex-R52 a Cortex-R82 s MPU (Memory Protection Unit).    <\/ul>\n<li class=\"l\"> V porte Xen pre architekt\u00faru RISC-V bola implementovan\u00e1 z\u00e1kladn\u00e1 podpora UART a mo\u017enos\u0165 spracovania vonkaj\u0161\u00edch preru\u0161enia (APLIC\/IMSIC) v re\u017eime hyperv\u00edzora.\n<li class=\"l\"> Pokra\u010dovalo sa v implement\u00e1cii po\u017eiadaviek na v\u00fdvoj bezpe\u010dn\u00e9ho a spo\u013eahliv\u00e9ho softv\u00e9ru v jazyku C, formulovan\u00fdch v \u0161pecifik\u00e1ci\u00e1ch MISRA-C pre kriticky d\u00f4le\u017eit\u00e9 syst\u00e9my.\n<li class=\"l\"> Bola ukon\u010den\u00e1 podpora star\u0161\u00edch verzi\u00ed GCC a Clang, pre zostavenie s\u00fa teraz potrebn\u00e9 minim\u00e1lne verzie GCC 5.1, Clang 11, Binutils 2.25 a GNU Make 3.80.  <\/ul>\n<p>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=64285\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 8 \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 4.21. \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, EPAM Systems \u0438 AMD. \u041a\u043e\u0434 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u043d\u0430\u043f\u0438\u0441\u0430\u043d \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 \u0421\u0438 \u0438 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 GPLv2+. \u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0430 \u0432\u0435\u0434\u0451\u0442\u0441\u044f \u0432 \u0441\u043e\u0441\u0442\u0430\u0432\u0435 \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 Linux Foundation. \u041a\u043b\u044e\u0447\u0435\u0432\u044b\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0432 Xen 4.21: \u041e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0430 \u043f\u043e\u043b\u043d\u0430\u044f \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u043c\u043e\u0434\u0435\u043b\u0438 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432 Linux stubdomain, [&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-148860","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - 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