{"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\/sv\/blog\/news\/vypusk-gipervizora-xen-4-21","title":{"rendered":"Utgivningen av hypervisor Xen 4.21","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Efter 8 m\u00e5naders utveckling har den fria hypervisorn Xen 4.21 sl\u00e4ppts. F\u00f6retag som Amazon, Arm, EPAM Systems och AMD har deltagit i utvecklingen av den nya versionen. Projektets kod \u00e4r skriven i C och distribueras under GPLv2+-licensen. Utvecklingen sker under Linux Foundations organisation.      <\/p>\n<p>Nyckelf\u00f6r\u00e4ndringar i Xen 4.21:   <\/p>\n<ul>\n<li class=\"l\"> Fullst\u00e4ndigt st\u00f6d f\u00f6r Linux stubdomain-enhetsmodell har tillhandah\u00e5llits, vilket g\u00f6r det m\u00f6jligt att k\u00f6ra komponenter f\u00f6r att emulera enheter under en separat icke-privilegierad anv\u00e4ndare. Linux stubomains-modellen har utvecklats av QUBES OS-projektet och st\u00f6der anv\u00e4ndning av emulatorer fr\u00e5n de senaste QEMU-versionerna, samt QEMU:s tillg\u00e4ngliga funktioner f\u00f6r g\u00e4stsystem.\n<li class=\"l\"> \u00c4ndringar f\u00f6r system baserade p\u00e5 x86-arkitekturen:\n<ul>\n<li class=\"l\"> St\u00f6d f\u00f6r den nya PDX (Page inDeX) komprimeringsalgoritmen har lagts till, vilket f\u00f6rb\u00e4ttrar Xen:s prestanda p\u00e5 Intel Sierra Forest och Granite Rapids-processorer vid icke-linj\u00e4r avbildning av fysisk minne (sparse memory map) som till\u00e5ter tomma omr\u00e5den.\n<li class=\"l\"> M\u00f6jlighet att kontrollera cache-attributet i MTRR (Memory Type Range Registers) f\u00f6r BAR (Base Address Register) i grund-PIC-enheten p\u00e5 Xen-plattformen har lagts till, vilket anv\u00e4nds av g\u00e4stsystem i HVM-l\u00e4ge. Som standard anges UC (uncacheable) attribut f\u00f6r det reflekterade minnet av PCI-enheter i MTRR, vilket \u00e4r meningsfullt f\u00f6r verkliga PCI-enheter, men som endast s\u00e4nker prestandan f\u00f6r PCI-enheten p\u00e5 Xen-plattformen.\n<li class=\"l\"> F\u00f6r AMD-processorer har en ny drivrutin, amd-cppc\/amd-cppc-epp, lagts till f\u00f6r att styra CPU-frekvens\u00e4ndringar f\u00f6r att uppn\u00e5 optimal prestanda. Drivrutinen anv\u00e4nder CPPC (Collaborative Processor Performance Control) mekanismen, som till skillnad fr\u00e5n acpi-cpufreq inte \u00e4r begr\u00e4nsad till tre prestandaniv\u00e5er och kan reagera snabbare p\u00e5 f\u00f6r\u00e4ndrade tillst\u00e5nd.\n<li class=\"l\"> I xenstore-stubdom-l\u00e4get, som anv\u00e4nds f\u00f6r att k\u00f6ra xenstored utan privilegier fr\u00e5n Dom0, har st\u00f6d f\u00f6r live-uppdatering implementerats f\u00f6r paravirtualiserade milj\u00f6er i PVH-l\u00e4ge.\n<li class=\"l\"> F\u00f6r Dom0 i PVH-l\u00e4ge har st\u00f6d f\u00f6r teknologin Resizable BAR (Resizable Base Address Register) implementerats, vilket g\u00f6r det m\u00f6jligt att f\u00e5 tillg\u00e5ng till hela minnet f\u00f6r PCI Express-enheten, ist\u00e4llet f\u00f6r att endast vara kopplad till block.\n<li class=\"l\"> M\u00f6jligheten att vidarebefordra PCI-enheter till domU-milj\u00f6er i HVM-l\u00e4ge (fullst\u00e4ndig h\u00e5rdvaruvirtualisering) har implementerats i konfigurationer d\u00e4r dom0 k\u00f6rs i PVH-l\u00e4ge (hybrid h\u00e5rdvaruvirtualisering och paravirtualisering).  <\/ul>\n<li class=\"l\"> \u00c4ndringar f\u00f6r system baserade p\u00e5 ARM-arkitekturen:\n<ul>\n<li class=\"l\"> M\u00f6jligheten att aktivera stackskyddsmekanismen har lagts till (kompilering med flaggan &#171;-fstack-protector&#187;), baserad p\u00e5 att l\u00e4gga till kanarief\u00e5glar i stacken &#8212; slumpm\u00e4ssiga sekvenser. Vid en buffert\u00f6verf\u00f6ring under utnyttjande av en s\u00e5rbarhet skrivs kanarief\u00e5geln \u00f6ver av andra data, vilket leder till att den efterf\u00f6ljande integritetskontrollen f\u00f6r kanarief\u00e5geln aktiveras och en n\u00f6dst\u00e4ngning av applikationen inleds.\n<li class=\"l\"> St\u00f6det f\u00f6r eSPI-mekanismen (Extended Shared Peripheral Interrupts) som tillhandah\u00e5lls av GICv3.1 avbrottskontroller har lagts till.\n<li class=\"l\"> Behandling av SMMU (System Memory Management Unit) vid vidarebefordran av PCIe-enheter har implementerats.\n<li class=\"l\"> St\u00f6det f\u00f6r PCI-v\u00e4rdkontroller som anv\u00e4nds i den fj\u00e4rde generationens SoC Renesas R-Car har lagts till.\n<li class=\"l\"> Inledande st\u00f6d f\u00f6r processorerna Cortex-R52 och Cortex-R82 med MPU (Memory Protection Unit) har lagts till.    <\/ul>\n<li class=\"l\"> I Xen-porten f\u00f6r RISC-V-arkitekturen har grundl\u00e4ggande st\u00f6d f\u00f6r UART och m\u00f6jlighet att hantera externa avbrott (APLIC\/IMSIC) i hypervisorl\u00e4ge implementerats.\n<li class=\"l\"> Arbetet med att uppfylla krav p\u00e5 utveckling av s\u00e4kra och p\u00e5litliga program i C, formulerat i MISRA-C-specifikationerna f\u00f6r kritiska system, har fortsatt.\n<li class=\"l\"> St\u00f6det f\u00f6r gamla versioner av GCC och Clang har upph\u00f6rt, och minst versionerna GCC 5.1, Clang 11, Binutils 2.25 och GNU Make 3.80 kr\u00e4vs nu f\u00f6r kompilering.  <\/ul>\n<p>K\u00e4lla: <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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