{"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\/novosti-interneta\/vypusk-gipervizora-xen-4-21","title":{"rendered":"Uscita del hypervisor Xen 4.21.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Dopo 8 mesi di sviluppo, \u00e8 stata pubblicata la release del hypervisor open source Xen 4.21. Tra le aziende che hanno partecipato allo sviluppo di questa nuova versione ci sono Amazon, Arm, EPAM Systems e AMD. Il codice del progetto \u00e8 scritto in linguaggio C ed \u00e8 distribuito sotto licenza GPLv2+. Lo sviluppo \u00e8 gestito nell'ambito della Linux Foundation.      <\/p>\n<p>Modifiche principali in Xen 4.21:   <\/p>\n<ul>\n<li class=\"l\"> \u00c8 stata garantita la piena supporto del modello di dispositivi Linux stubdomain, che consente di eseguire i componenti per l'emulazione dei dispositivi sotto 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, cos\u00ec come le funzionalit\u00e0 correlate disponibili in QEMU per i sistemi guest.\n<li class=\"l\"> Modifiche per i sistemi basati sull'architettura x86:\n<ul>\n<li class=\"l\"> \u00c8 stato aggiunto il supporto per 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 presenza di una mappatura della memoria fisica non lineare (sparse memory map), che pu\u00f2 presentare 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 dalle macchine virtuali in modalit\u00e0 HVM. Per impostazione predefinita, in MTRR per la memoria riflessa dei dispositivi PCI, l'attributo \u00e8 impostato su UC (uncacheable), il che ha senso per i dispositivi PCI reali, 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 ottenere prestazioni ottimali. Il driver utilizza il meccanismo CPPC (Collaborative Processor Performance Control), che a differenza di acpi-cpufreq non \u00e8 limitato a tre livelli di prestazione e consente una risposta pi\u00f9 rapida ai cambiamenti dello stato.\n<li class=\"l\"> Nella variante dello stub xenstore-stubdom, utilizzata per avviare xenstored senza privilegi di Dom0, \u00e8 stata implementata la supporto all'aggiornamento live per gli ambienti paravirtualizzati in modalit\u00e0 PVH.\n<li class=\"l\"> Per Dom0 in modalit\u00e0 PVH \u00e8 stata implementata la supporto della tecnologia Resizable BAR (Resizable Base Address Register), che consente di accedere immediatamente all'intera memoria del dispositivo PCI Express, e non solo in relazione ai blocchi.\n<li class=\"l\"> \u00c8 stata implementata la possibilit\u00e0 di inoltrare 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 sistemi basati su 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 nel stack di marcatori a canarino \u2014 sequenze casuali. In caso di overflow del buffer durante l'utilizzo di vulnerabilit\u00e0, il marcatore a canarino viene sovrascritto da altri dati, il che porta all'attivazione del successivo controllo di integrit\u00e0 del marcatore e all'inizio di un'uscita 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 l'inoltro di dispositivi PCIe.\n<li class=\"l\"> \u00c8 stata aggiunta la compatibilit\u00e0 iniziale 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 port XEN per l'architettura RISC-V \u00e8 implementato il supporto di base per UART e la gestione delle interruzioni esterne (APLIC\/IMSIC) in modalit\u00e0 hypervisor.\n<li class=\"l\"> Continua l'implementazione dei requisiti per lo sviluppo di software sicuro e affidabile in linguaggio C, come specificato nelle specifiche MISRA-C per i sistemi critici.\n<li class=\"l\"> Interrotta la supporto per le vecchie versioni di GCC e Clang; ora sono richieste almeno la versione 5.1 di GCC, la versione 11 di Clang, 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 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Le principali novit\u00e0 in Xen 4.21: supporto completo per il modello di dispositivi Linux stubdomain.","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/vypusk-gipervizora-xen-4-21","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0412\u044b\u043f\u0443\u0441\u043a \u0433\u0438\u043f\u0435\u0440\u0432\u0438\u0437\u043e\u0440\u0430 Xen 4.21 | ProHoster","og:description":"\u041f\u043e\u0441\u043b\u0435 8 \u043c\u0435\u0441\u044f\u0446\u0435\u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 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