{"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\/fr\/blog\/news\/v-gipervizore-xen-realizovana-podderzhka-platy-raspberry-pi-4","title":{"rendered":"Le gestionnaire de virtualisation Xen prend en charge la carte Raspberry Pi 4","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Les d\u00e9veloppeurs du projet Xen ont annonc\u00e9<\/a><\/noindex> ont annonc\u00e9 la r\u00e9alisation de l'utilisation de Xen Hypervisor sur les cartes Raspberry Pi 4. L'adaptation de Xen pour fonctionner sur les versions pr\u00e9c\u00e9dentes des cartes Raspberry Pi \u00e9tait compliqu\u00e9e par l'utilisation d'un contr\u00f4leur d'interruption non standard, qui ne supportait pas la virtualisation. La Raspberry Pi 4 a utilis\u00e9 un contr\u00f4leur d'interruption GIC-400 standard, pris en charge par Xen, et les d\u00e9veloppeurs s'attendaient \u00e0 ce qu'il n'y ait pas de probl\u00e8mes pour faire fonctionner Xen. Cependant, en r\u00e9alit\u00e9, les choses se sont r\u00e9v\u00e9l\u00e9es plus compliqu\u00e9es que pr\u00e9vu, et pour assurer le bon fonctionnement de Xen sur la Raspberry Pi 4, des modifications significatives ont d\u00fb \u00eatre apport\u00e9es au code pour g\u00e9rer la m\u00e9moire.<\/p>\n

Les premi\u00e8res versions de la carte Raspberry Pi 4 limitaient l'acc\u00e8s \u00e0 l'espace d'adressage du premier gigaoctet de m\u00e9moire, ce qui \u00e9tait insuffisant pour Dom0. Les modifications n\u00e9cessaires ont \u00e9t\u00e9 apport\u00e9es dans la version Xen 4.14, mais un autre probl\u00e8me est rapidement apparu \u2014 dans le sous-syst\u00e8me Xen pour la conversion des adresses virtuelles en adresses physiques, un appel \u00e0 virt_to_phys \u00e9tait utilis\u00e9, qui ne fonctionnait pas pour toutes les adresses virtuelles, et les tentatives de conversion de certaines adresses virtuelles aboutissaient \u00e0 une erreur. Pour r\u00e9soudre ce probl\u00e8me, il a \u00e9t\u00e9 n\u00e9cessaire d'ajouter une autre fonction de conversion d'adresses.<\/p>\n

Les probl\u00e8mes ne se sont pas arr\u00eat\u00e9s l\u00e0 et une particularit\u00e9 dans le fonctionnement du DMA est apparue \u2014 sur toutes les plateformes pr\u00e9c\u00e9demment prises en charge par Xen (x86, ARM et ARM64), les adresses DMA et les adresses physiques \u00e9taient toujours identiques, mais sur le Raspberry Pi 4, elles diff\u00e9raient. Trouver une solution \u00e0 ce probl\u00e8me s'est r\u00e9v\u00e9l\u00e9 \u00eatre le plus difficile et a n\u00e9cessit\u00e9 le d\u00e9veloppement de patchs pour le noyau Linux, effectuant la conversion entre les adresses physiques et les adresses DMA. <\/p>\n

Les corrections pr\u00e9par\u00e9es ont \u00e9t\u00e9 int\u00e9gr\u00e9es dans la version 5.9 du noyau Linux et d\u00e9sormais, Xen est reconnu comme \u00e9tant pr\u00eat pour mettre en place la virtualisation sur les cartes Raspberry Pi 4. Notamment, sur la Raspberry Pi 4, il est maintenant possible d'utiliser EVE<\/a><\/noindex> (Edge Virtualization Engine), un moteur pour cr\u00e9er et ex\u00e9cuter des applications cloud-native utilisant Xen, Linuxkit<\/a><\/noindex> et Alpine Linux<\/a><\/noindex> pour construire une infrastructure de virtualisation sur des appareils portatifs.<\/p>\n

De plus, on peut noter l'\u00e9limination de 10 vuln\u00e9rabilit\u00e9s<\/a><\/noindex> dans Xen. Les vuln\u00e9rabilit\u00e9s CVE-2020-25599<\/a><\/noindex>,
\nCVE-2020-25603<\/a><\/noindex> et
\nCVE-2020-25595<\/a><\/noindex>
\n permettent potentiellement \u00e0 un syst\u00e8me invit\u00e9 d'obtenir des privil\u00e8ges dans l'environnement h\u00f4te. Les probl\u00e8mes
\nCVE-2020-25601<\/a><\/noindex>, CVE-2020-25600<\/a><\/noindex>,
\nCVE-2020-25596<\/a><\/noindex>,
\nCVE-2020-25597<\/a><\/noindex>,
\nCVE-2020-25604<\/a><\/noindex>,
\nCVE-2020-25598<\/a><\/noindex> et
\nCVE-2020-25602<\/a><\/noindex>
\nse limitent \u00e0 r\u00e9aliser des attaques par d\u00e9ni de service.<\/p>\n

<\/a><\/noindex><\/p>\n

Source : opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\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 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[…]<\/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\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47La prise en charge de la carte Raspberry Pi 4 est impl\u00e9ment\u00e9e dans l'hyperviseur Xen | ProHoster","description":"Les d\u00e9veloppeurs du projet Xen ont annonc\u00e9 la r\u00e9alisation de l'utilisation de Xen Hypervisor sur les 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