{"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\/da\/blog\/news\/v-gipervizore-xen-realizovana-podderzhka-platy-raspberry-pi-4","title":{"rendered":"I hypervisor Xen underst\u00f8tter Raspberry Pi 4 hardware.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

De udviklere, der arbejder p\u00e5 Xen-projektet, at de kun havde to blokke tilbage \/8.<\/a><\/noindex> har arbejdet p\u00e5 muligheden for at bruge Xen Hypervisor p\u00e5 Raspberry Pi 4 kort. Tidligere var det en udfordring at tilpasse Xen til tidligere versioner af Raspberry Pi, p\u00e5 grund af brugen af en ikke-standard afbrydercontroller, der ikke underst\u00f8ttede virtualisering. P\u00e5 Raspberry Pi 4 er der anvendt en almindelig GIC-400 afbrydercontroller, som underst\u00f8ttes af Xen, og udviklerne forventede, at der ikke ville v\u00e6re problemer med at k\u00f8re Xen. Men i praksis viste det sig at v\u00e6re en anden sag, og for at f\u00e5 Xen til at fungere p\u00e5 Raspberry Pi 4 var det n\u00f8dvendigt at foretage betydelige \u00e6ndringer i koden til hukommelsesstyring.<\/p>\n

De f\u00f8rste versioner af Raspberry Pi 4 begr\u00e6nsede adgangen til kun det adresserum p\u00e5 den f\u00f8rste gigabyte hukommelse, hvilket var utilstr\u00e6kkeligt til Dom0. N\u00f8dvendige \u00e6ndringer blev implementeret i Xen 4.14, men der opstod straks et andet problem \u2014 i Xen-undertriesen til konvertering af virtuelle adresser til fysiske blev kaldet virt_to_phys brugt, som ikke fungerede for alle virtuelle adresser, og fors\u00f8g p\u00e5 at konvertere nogle virtuelle adresser resulterede i fejl. For at l\u00f8se dette problem m\u00e5tte der tilf\u00f8jes en anden adressekonverteringsfunktion.<\/p>\n

Problemerne sluttede ikke der, og en s\u00e6rlig egenskab i DMA-arbejdet opstod \u2014 i alle tidligere underst\u00f8ttede Xen-platforme (x86, ARM og ARM64) var DMA-adresser og fysiske adresser altid de samme, men i Raspberry Pi 4 var de forskellige. At finde en l\u00f8sning p\u00e5 dette problem viste sig at v\u00e6re det vanskeligste og kr\u00e6vede udvikling af patches til Linux-kernen, der udf\u00f8rte konvertering mellem fysiske adresser og DMA-adresser. <\/p>\n

De forberedte rettelser blev inkluderet i Linux-kernen 5.9, og nu er Xen anerkendt som klar til at implementere virtualisering p\u00e5 Raspberry Pi 4 kort. Desuden kan man nu bruge EVE<\/a><\/noindex> (Edge Virtualization Engine), en motor til at oprette og k\u00f8re cloud-native applikationer, der bruger Xen, Linuxkit<\/a><\/noindex> og Alpine Linux<\/a><\/noindex> til at bygge virtualiseringsinfrastruktur p\u00e5 portable enheder.<\/p>\n

Det kan ogs\u00e5 bem\u00e6rkes, at 10 s\u00e5rbarheder<\/a><\/noindex> er blevet udbedret i Xen. S\u00e5rbarhederne CVE-2020-25599<\/a><\/noindex>,
\nCVE-2020-25603<\/a><\/noindex> og
\nCVE-2020-25595<\/a><\/noindex>
\n giver potentielt mulighed for, at en g\u00e6stesystem kan opn\u00e5 privilige i v\u00e6rtssystemet. Problemerne
\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> og
\nCVE-2020-25602<\/a><\/noindex>
\ner begr\u00e6nset til at for\u00e5rsage service-n\u00e6gtelse.<\/p>\n

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

Kilde: 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\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\udd47I Xen-hypervisoren er der implementeret st\u00f8tte til Raspberry Pi 4 | ProHoster","description":"Udviklerne af projektet Xen har annonceret implementeringen af muligheden for at bruge Xen Hypervisor p\u00e5 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