{"id":95507,"date":"2020-09-30T13:42:18","date_gmt":"2020-09-30T11:42:18","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-gipervizore-xen-realizovana-podderzhka-platy-raspberry-pi-4"},"modified":"2020-09-30T13:42:18","modified_gmt":"2020-09-30T11:42:18","slug":"v-gipervizore-xen-realizovana-podderzhka-platy-raspberry-pi-4","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/v-gipervizore-xen-realizovana-podderzhka-platy-raspberry-pi-4","title":{"rendered":"Nel hypervisor Xen \u00e8 stato implementato il supporto per la scheda Raspberry Pi 4","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Gli sviluppatori del progetto Xen <noindex><a rel=\"nofollow\" href=\"https:\/\/xenproject.org\/2020\/09\/29\/xen-on-raspberry-pi-4-adventures\/\">hanno annunciato<\/a><\/noindex> hanno realizzato la possibilit\u00e0 di utilizzare Xen Hypervisor sulle schede Raspberry Pi 4. L'adattamento di Xen per funzionare su versioni precedenti delle schede Raspberry Pi era ostacolato dall'uso di un controller delle interruzioni non standard, che non supportava la virtualizzazione. Nella Raspberry Pi 4 \u00e8 stato utilizzato un comune controller delle interruzioni GIC-400, supportato in Xen, e gli sviluppatori si aspettavano che non ci sarebbero stati problemi nell'avviare Xen. Tuttavia, la situazione si \u00e8 rivelata pi\u00f9 complicata del previsto e sono stati necessari cambiamenti significativi nel codice per gestire la memoria.<\/p>\n<p> Le prime versioni delle schede Raspberry Pi 4 limitavano l'accesso solo allo spazio indirizzi del primo gigabyte di memoria, che non era sufficiente per Dom0. Le modifiche necessarie sono state apportate con il rilascio di Xen 4.14, ma \u00e8 immediatamente emerso un altro problema \u2014 nella sottosistema Xen per la conversione degli indirizzi virtuali in fisici veniva utilizzata la chiamata virt_to_phys, che non funzionava per tutti gli indirizzi virtuali e i tentativi di conversione di alcuni indirizzi virtuali finite con un errore. Per risolvere questo problema \u00e8 stato necessario aggiungere un'altra funzione di conversione degli indirizzi.<\/p>\n<p>Ma i problemi non si sono fermati qui e \u00e8 emerso un dettaglio nel funzionamento del DMA \u2014 in tutte le piattaforme precedentemente supportate da Xen (x86, ARM e ARM64) gli indirizzi DMA e gli indirizzi fisici coincidevano sempre, ma nel Raspberry Pi 4 differivano. Trovare una soluzione per questo problema si \u00e8 rivelato il pi\u00f9 complesso di tutti e ha richiesto lo sviluppo di patch per il kernel Linux, che eseguivano la conversione tra indirizzi fisici e indirizzi DMA. <\/p>\n<p>Le correzioni preparate sono state incluse nel kernel Linux 5.9 e ora Xen \u00e8 riconosciuto come pronto per la virtualizzazione sulle schede Raspberry Pi 4. In particolare, sulla Raspberry Pi 4 \u00e8 ora possibile utilizzare <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/lf-edge\/eve\">EVE<\/a><\/noindex> (Edge Virtualization Engine), un motore per creare e lanciare applicazioni cloud-native che utilizza Xen, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/linuxkit\/linuxkit\">Linuxkit<\/a><\/noindex> e <noindex><a rel=\"nofollow\" href=\"https:\/\/alpinelinux.org\/\">Alpine Linux<\/a><\/noindex> per costruire infrastrutture di virtualizzazione su dispositivi portatili.<\/p>\n<p>Inoltre, \u00e8 da segnalare la risoluzione di <noindex><a rel=\"nofollow\" href=\"https:\/\/xenbits.xen.org\/xsa\/\">10 vulnerabilit\u00e0<\/a><\/noindex> in Xen. Le vulnerabilit\u00e0 <noindex><a rel=\"nofollow\" href=\"https:\/\/xenbits.xen.org\/xsa\/advisory-343.html\">CVE-2020-25599<\/a><\/noindex>,<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/xenbits.xen.org\/xsa\/advisory-340.html\">CVE-2020-25603<\/a><\/noindex> e<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/xenbits.xen.org\/xsa\/advisory-337.html\">CVE-2020-25595<\/a><\/noindex><br \/>\n potenzialmente consentono alla macchina virtuale di ottenere privilegi nell'ambiente host. I problemi<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/xenbits.xen.org\/xsa\/advisory-344.html\">CVE-2020-25601<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/xenbits.xen.org\/xsa\/advisory-342.html\">CVE-2020-25600<\/a><\/noindex>,<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/xenbits.xen.org\/xsa\/advisory-339.html\">CVE-2020-25596<\/a><\/noindex>,<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/xenbits.xen.org\/xsa\/advisory-338.html\">CVE-2020-25597<\/a><\/noindex>,<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/xenbits.xen.org\/xsa\/advisory-336.html\">CVE-2020-25604<\/a><\/noindex>,<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/xenbits.xen.org\/xsa\/advisory-334.html\">CVE-2020-25598<\/a><\/noindex> e<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/xenbits.xen.org\/xsa\/advisory-333.html\">CVE-2020-25602<\/a><\/noindex><br \/>\nsono limitati all'esecuzione di attacchi di denial of service.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=53807\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 Xen \u043e\u0431\u044a\u044f\u0432\u0438\u043b\u0438 \u043e \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f Xen Hypervisor \u043d\u0430 \u043f\u043b\u0430\u0442\u0430\u0445 Raspberry Pi 4. \u0410\u0434\u0430\u043f\u0442\u0430\u0446\u0438\u0438 Xen \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u043d\u0430 \u043f\u0440\u043e\u0448\u043b\u044b\u0445 \u0432\u0430\u0440\u0438\u0430\u043d\u0442\u0430\u0445 \u043f\u043b\u0430\u0442 Raspberry Pi \u043c\u0435\u0448\u0430\u043b\u043e \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435 \u043d\u0435\u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u043e\u0433\u043e \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u043b\u0435\u0440\u0430 \u043f\u0440\u0435\u0440\u044b\u0432\u0430\u043d\u0438\u0439, \u043d\u0435 \u0438\u043c\u0435\u044e\u0449\u0435\u0433\u043e \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0438 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438. \u0412 Raspberry Pi 4 \u0431\u044b\u043b \u043f\u0440\u0438\u043c\u0435\u043d\u0451\u043d \u043e\u0431\u044b\u0447\u043d\u044b\u0439 \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u043b\u0435\u0440 \u043f\u0440\u0435\u0440\u044b\u0432\u0430\u043d\u0438\u0439 GIC-400, \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u0435\u043c\u044b\u0439 \u0432 Xen, \u0438 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u0440\u0430\u0441\u0441\u0447\u0438\u0442\u044b\u0432\u0430\u043b\u0438, \u0447\u0442\u043e \u043f\u0440\u043e\u0431\u043b\u0435\u043c \u0441 \u0437\u0430\u043f\u0443\u0441\u043a\u043e\u043c Xen [&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-95507","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 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 Xen \u043e\u0431\u044a\u044f\u0432\u0438\u043b\u0438 \u043e \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 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