{"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\/es\/blog\/news\/v-gipervizore-xen-realizovana-podderzhka-platy-raspberry-pi-4","title":{"rendered":"El hipervisor Xen admite soporte para la placa Raspberry Pi 4","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Los desarrolladores del proyecto Xen anunciaron<\/a><\/noindex> han implementado la posibilidad de utilizar Xen Hypervisor en placas Raspberry Pi 4. La adaptaci\u00f3n de Xen para funcionar en versiones anteriores de las placas Raspberry Pi se vio obstaculizada por el uso de un controlador de interrupciones no est\u00e1ndar, que no contaba con soporte para virtualizaci\u00f3n. En Raspberry Pi 4 se utiliz\u00f3 un controlador de interrupciones GIC-400, que es compatible con Xen, y los desarrolladores esperaban que no hubiera problemas para ejecutar Xen. Pero en realidad, todo result\u00f3 no ser como se esperaba, y para asegurar el funcionamiento de Xen en Raspberry Pi 4 fue necesario realizar cambios significativos en el c\u00f3digo para el manejo de la memoria.<\/p>\n

Las primeras versiones de la placa Raspberry Pi 4 limitaban el acceso solo al espacio de direcciones del primer gigabyte de memoria, lo cual no era suficiente para Dom0. Se realizaron los cambios necesarios en la versi\u00f3n Xen 4.14, pero surgi\u00f3 inmediatamente otro problema: en el subsistema de Xen para convertir direcciones virtuales a f\u00edsicas se utilizaba la llamada virt_to_phys, que no funcionaba para todas las direcciones virtuales y los intentos de conversi\u00f3n de algunas direcciones virtuales terminaron en error. Para solucionar este problema, fue necesario a\u00f1adir otra funci\u00f3n de conversi\u00f3n de direcciones.<\/p>\n

Los problemas no terminaron ah\u00ed y surgi\u00f3 una particularidad en el funcionamiento de DMA: en todas las plataformas previamente soportadas por Xen (x86, ARM y ARM64) las direcciones de DMA y las direcciones f\u00edsicas siempre coincid\u00edan, pero en Raspberry Pi 4 eran diferentes. Encontrar una soluci\u00f3n para este problema result\u00f3 ser lo m\u00e1s complicado y requiri\u00f3 el desarrollo de parches para el n\u00facleo de Linux que realizaban la conversi\u00f3n entre direcciones f\u00edsicas y direcciones de DMA. <\/p>\n

Las correcciones preparadas se incluyeron en el n\u00facleo de Linux 5.9 y ahora Xen se considera listo para la virtualizaci\u00f3n en placas Raspberry Pi 4. En particular, ahora se puede utilizar en Raspberry Pi 4 EVE<\/a><\/noindex> (Edge Virtualization Engine), un motor para crear y ejecutar aplicaciones nativas de la nube que utilizan Xen, Linuxkit<\/a><\/noindex> y Alpine Linux<\/a><\/noindex> para construir infraestructuras de virtualizaci\u00f3n en dispositivos port\u00e1tiles.<\/p>\n

Adicionalmente, se puede se\u00f1alar la eliminaci\u00f3n de 10 vulnerabilidades<\/a><\/noindex> en Xen. Las vulnerabilidades CVE-2020-25599<\/a><\/noindex>,
\nCVE-2020-25603<\/a><\/noindex> y
\nCVE-2020-25595<\/a><\/noindex>
\n potencialmente permiten que un sistema hu\u00e9sped obtenga privilegios en el entorno del anfitri\u00f3n. Los problemas
\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> y
\nCVE-2020-25602<\/a><\/noindex>
\nse limitan a causar denegaci\u00f3n de servicio.<\/p>\n

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

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

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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\udd47En el hipervisor Xen se ha implementado soporte para la placa Raspberry Pi 4 | ProHoster","description":"Los desarrolladores del proyecto Xen han anunciado la implementaci\u00f3n de la posibilidad de usar Xen Hypervisor en 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