{"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\/da\/blog\/news\/vypusk-gipervizora-xen-4-21","title":{"rendered":"Udgivelse af hypervisor Xen 4.21","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Efter 8 m\u00e5neders udvikling er frigivelsen af den frie hypervisor Xen 4.21 offentliggjort. Nogle af de deltage virksomheder i udviklingen af den nye version inkluderer Amazon, Arm, EPAM Systems og AMD. Koden til projektet er skrevet i C og distribueres under GPLv2+-licensen. Udviklingen er en del af Linux Foundation.      <\/p>\n<p>N\u00f8gle\u00e6ndringer i Xen 4.21:   <\/p>\n<ul>\n<li class=\"l\"> Der er sikret fuld st\u00f8tte til Linux stubdomain-enhedsmodel, som g\u00f8r det muligt at udf\u00f8re komponenter til emulering af enheder under en separat, ikke-privilegeret bruger. Linux stubomains-modellen er udviklet af QUBES OS-projektet og underst\u00f8tter brugen af emuleringsdrivere fra de nyeste versioner af QEMU samt tilg\u00e6ngelige underst\u00f8ttelsesmuligheder i QEMU for g\u00e6stesystemer.\n<li class=\"l\"> \u00c6ndringer for systemer baseret p\u00e5 x86-arkitektur:\n<ul>\n<li class=\"l\"> St\u00f8tte til den nye PDX (Page inDeX) kompressionsalgoritme er tilf\u00f8jet, hvilket forbedrer Xen's ydeevne p\u00e5 Intel Sierra Forest og Granite Rapids processorer ved ikke-line\u00e6r kortl\u00e6gning af fysisk hukommelse (sparse memory map), der tillader tomme omr\u00e5der.\n<li class=\"l\"> Muligheden for at kontrollere cache-attributten i MTRR (Memory Type Range Registers) for BAR (Base Address Register) af Xen-platformens grundl\u00e6ggende PCI-enhed, der anvendes af g\u00e6stesystemer i HVM-tilstand, er tilf\u00f8jet. MTRR-synkronisering for PPC-enheder er som standard sat til UC (uncacheable) attribut, hvilket er meningsfuldt for virkelige PCI-enheder, men kun reducerer ydeevnen af Xen-platformens PCI-enhed.\n<li class=\"l\"> For AMD-processorer er en ny driver amd-cppc\/amd-cppc-epp tilf\u00f8jet, der styrer CPU-frekvens\u00e6ndringer for at opn\u00e5 optimal ydeevne. Driveren benytter CPPC (Collaborative Processor Performance Control) mekanismen, som, i mods\u00e6tning til acpi-cpufreq, ikke er begr\u00e6nset til tre ydeevneniveauer og tillader hurtigere reaktion p\u00e5 \u00e6ndringer i tilstand.\n<li class=\"l\"> I xenstore-stubdom-laget, der bruges til at k\u00f8re xenstored uden privilegier fra Dom0, er der implementeret underst\u00f8ttelse af live-opdatering til para-virtualiserede milj\u00f8er i PVH-tilstand.\n<li class=\"l\"> For Dom0 i PVH-tilstand er der implementeret st\u00f8tte til Resizable BAR-teknologi (Resizable Base Address Register), der g\u00f8r det muligt at tilg\u00e5 hele hukommelsen af PCI Express-enheden ad gangen og ikke kun i forbindelse med blokke.\n<li class=\"l\"> Muligheden for at videresende PCI-enheder til domU-milj\u00f8er i HVM-tilstand (fuld hardwarevirtualisering) er blevet implementeret i konfigurationer, hvor dom0 k\u00f8rer i PVH-tilstand (hybrid hardwarevirtualisering og paravirtualisering).  <\/ul>\n<li class=\"l\"> \u00c6ndringer til systemer baseret p\u00e5 ARM-arkitektur:\n<ul>\n<li class=\"l\"> Muligheden for at aktivere en stack beskyttelsesmekanisme (bygning med flaget &#171;-fstack-protector&#187;) er tilf\u00f8jet. Denne mekanisme er baseret p\u00e5 at tilf\u00f8je kanarim\u00e6rker til stakken \u2014 tilf\u00e6ldige sekvenser. Ved en buffer overflow under udnyttelsen af en s\u00e5rbarhed bliver kanarim\u00e6rket overskrevet af andre data, hvilket f\u00f8rer til aktivering af den efterf\u00f8lgende integritetskontrol af m\u00e6rket og igangs\u00e6ttelse af en n\u00f8dafslutning af applikationen.\n<li class=\"l\"> Support for eSPI (Extended Shared Peripheral Interrupts) mekanismen, som leveres af GICv3.1 afbryderkontrollere, er blevet tilf\u00f8jet.\n<li class=\"l\"> Behandlingen af SMMU (System Memory Management Unit) ved videresendelse af PCIe-enheder er blevet implementeret.\n<li class=\"l\"> Support for PCI-v\u00e6rtscontrollere, der anvendes i fjerde generation af Renesas R-Car SoC, er blevet tilf\u00f8jet.\n<li class=\"l\"> Indledende support for Cortex-R52 og Cortex-R82 processorer med MPU (Memory Protection Unit) er blevet tilf\u00f8jet.    <\/ul>\n<li class=\"l\"> Basal support for UART og mulighed for at h\u00e5ndtere eksterne afbrydelser (APLIC\/IMSIC) i hypervisor-tilstand er blevet implementeret i Xen-porten til RISC-V-arkitektur.\n<li class=\"l\"> Implementeringen af kravene til udvikling af sikre og p\u00e5lidelige programmer p\u00e5 C-sproget, som er formuleret i MISRA-C specifikationerne for kritiske systemer, er fortsat.\n<li class=\"l\"> Support til \u00e6ldre versioner af GCC og Clang er stoppet; der kr\u00e6ves nu mindst versioner af GCC 5.1, Clang 11, Binutils 2.25 og GNU Make 3.80 for at kompilere.  <\/ul>\n<p>Kilde: <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 5.0.3 - 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