{"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\/it\/blog\/news\/vypusk-gipervizora-xen-4-21","title":{"rendered":"Rilascio del hypervisor Xen 4.21","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Dopo 8 mesi di sviluppo, \u00e8 stata rilasciata la versione del hypervisor open source Xen 4.21. Hanno partecipato allo sviluppo di questa nuova release aziende come Amazon, Arm, EPAM Systems e AMD. Il codice del progetto \u00e8 scritto in linguaggio C ed \u00e8 distribuito sotto licenza GPLv2+. Lo sviluppo avviene all'interno dell'organizzazione Linux Foundation.      <\/p>\n<p>Modifiche principali in Xen 4.21:   <\/p>\n<ul>\n<li class=\"l\"> \u00c8 stata garantita la piena compatibilit\u00e0 con il modello di dispositivi Linux stubdomain, che consente di eseguire i componenti per l'emulazione dei dispositivi all'interno di un utente non privilegiato separato. Il modello Linux stubomains \u00e8 stato sviluppato dal progetto QUBES OS e supporta l'uso di driver di emulazione dalle versioni recenti di QEMU, oltre a funzionalit\u00e0 correlate disponibili in QEMU per i sistemi guest.\n<li class=\"l\"> Modifiche per i sistemi basati su architettura x86:\n<ul>\n<li class=\"l\"> \u00c8 stata aggiunta la compatibilit\u00e0 con un nuovo algoritmo di compressione della struttura PDX (Page inDeX), che migliora le prestazioni di Xen sui processori Intel Sierra Forest e Granite Rapids in caso di mappatura non lineare della memoria fisica (sparse memory map), che consente la presenza di aree vuote.\n<li class=\"l\"> \u00c8 stata aggiunta la possibilit\u00e0 di controllare l'attributo di caching in MTRR (Memory Type Range Registers) per il registro BAR (Base Address Register) del dispositivo PCI di base della piattaforma Xen, utilizzato dai sistemi guest in modalit\u00e0 HVM. Per impostazione predefinita, nell'MTRR per la memoria riflessa dei dispositivi PCI, l'attributo \u00e8 impostato su UC (uncacheable), che ha senso per i reali dispositivi PCI, ma riduce le prestazioni del dispositivo PCI della piattaforma Xen.\n<li class=\"l\"> Per i processori AMD \u00e8 stato aggiunto un nuovo driver amd-cppc\/amd-cppc-epp, che gestisce la variazione della frequenza della CPU per ottimizzare le prestazioni. Nel driver \u00e8 utilizzato il meccanismo CPPC (Collaborative Processor Performance Control), che, a differenza di acpi-cpufreq, non \u00e8 limitato a tre livelli di prestazione e permette una reazione pi\u00f9 rapida ai cambiamenti di stato.\n<li class=\"l\"> Nella versione dello strato xenstore-stubdom, utilizzata per eseguire xenstored senza privilegi di Dom0, \u00e8 stata implementata la supporto per gli aggiornamenti live negli ambienti paravirtualizzati in modalit\u00e0 PVH.\n<li class=\"l\"> Per Dom0 in modalit\u00e0 PVH \u00e8 stata implementata la tecnologia Resizable BAR (Resizable Base Address Register), che consente di accedere subito a tutta la memoria del dispositivo PCI Express, e non solo in relazione ai blocchi.\n<li class=\"l\"> \u00c8 stata implementata la possibilit\u00e0 di passthrough dei dispositivi PCI negli ambienti domU in modalit\u00e0 HVM (virtualizzazione hardware completa) nelle configurazioni in cui dom0 opera in modalit\u00e0 PVH (virtualizzazione ibrida hardware e paravirtualizzazione).  <\/ul>\n<li class=\"l\"> Modifiche per i sistemi basati sull'architettura ARM:\n<ul>\n<li class=\"l\"> \u00c8 stata aggiunta la possibilit\u00e0 di attivare il meccanismo di protezione dello stack (compilazione con il flag &#171;-fstack-protector&#187;), basato sull'aggiunta di etichette canarie nello stack - sequenze casuali. In caso di overflow del buffer durante lo sfruttamento di una vulnerabilit\u00e0, l'etichetta canaria viene sovrascritta da altri dati, il che porta all'attivazione del successivo controllo di integrit\u00e0 dell'etichetta e all'avvio di una chiusura anomala dell'applicazione.\n<li class=\"l\"> \u00c8 stato aggiunto il supporto per il meccanismo eSPI (Extended Shared Peripheral Interrupts), fornito dai controller di interruzione GICv3.1.\n<li class=\"l\"> \u00c8 stata implementata la gestione SMMU (System Memory Management Unit) durante il passthrough dei dispositivi PCIe.\n<li class=\"l\"> \u00c8 stato aggiunto il supporto per i controller host PCI utilizzati nella quarta generazione di SoC Renesas R-Car.\n<li class=\"l\"> \u00c8 stato aggiunto il supporto iniziale per i processori Cortex-R52 e Cortex-R82 con MPU (Memory Protection Unit).    <\/ul>\n<li class=\"l\"> Nel porting di Xen per l'architettura RISC-V \u00e8 stato implementato il supporto di base per UART e la possibilit\u00e0 di gestire interruzioni esterne (APLIC\/IMSIC) in modalit\u00e0 hypervisor.\n<li class=\"l\"> Proseguita l'attuazione dei requisiti per lo sviluppo di software sicuri e affidabili in linguaggio C, formulati nelle specifiche MISRA-C per sistemi critici.\n<li class=\"l\"> \u00c8 stata interrotta la supporto per le versioni obsolete di GCC e Clang, ora sono necessarie almeno le versioni GCC 5.1, Clang 11, Binutils 2.25 e GNU Make 3.80 per la compilazione.  <\/ul>\n<p>Fonte: <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 5.0.1.1 - 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