{"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\/cs\/blog\/news\/v-gipervizore-xen-realizovana-podderzhka-platy-raspberry-pi-4","title":{"rendered":"V hypervizoru Xen je implementov\u00e1na podpora pro desku Raspberry Pi 4","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V\u00fdvoj\u00e1\u0159i projektu Xen ozn\u00e1mili<\/a><\/noindex> o realizaci mo\u017enosti vyu\u017eit\u00ed Xen Hypervisor na desk\u00e1ch Raspberry Pi 4. Adaptace Xen pro minul\u00e1 vyd\u00e1n\u00ed desek Raspberry Pi br\u00e1nilo pou\u017eit\u00ed nestandardn\u00edho ovlada\u010de p\u0159eru\u0161en\u00ed, kter\u00fd nem\u011bl podporu virtualizace. Na Raspberry Pi 4 byl pou\u017eit b\u011b\u017en\u00fd ovlada\u010d p\u0159eru\u0161en\u00ed GIC-400, kter\u00fd je podporov\u00e1n v Xen, a v\u00fdvoj\u00e1\u0159i o\u010dek\u00e1vali, \u017ee nebudou \u017e\u00e1dn\u00e9 probl\u00e9my se spu\u0161t\u011bn\u00edm Xen. Ale ve skute\u010dnosti to nebylo tak, jak se p\u0159edpokl\u00e1dalo, a pro zaji\u0161t\u011bn\u00ed funk\u010dnosti Xen na Raspberry Pi 4 bylo t\u0159eba prov\u00e9st v\u00fdrazn\u00e9 zm\u011bny v k\u00f3du pro pr\u00e1ci s pam\u011bt\u00ed.<\/p>\n

Prvn\u00ed varianty desek Raspberry Pi 4 omezovaly p\u0159\u00edstup pouze na adresn\u00ed prostor prvn\u00edho gigabajtu pam\u011bti, co\u017e bylo nedostate\u010dn\u00e9 pro Dom0. Nezbytn\u00e9 zm\u011bny byly provedeny v vyd\u00e1n\u00ed Xen 4.14, ale brzy se objevila dal\u0161\u00ed probl\u00e9m - v subsyst\u00e9mu Xen pro p\u0159evod virtu\u00e1ln\u00edch adres na fyzick\u00e9 se pou\u017e\u00edval vol\u00e1n\u00ed virt_to_phys, kter\u00e9 nefungovalo pro v\u0161echny virtu\u00e1ln\u00ed adresy a pokusy o p\u0159evod n\u011bkter\u00fdch virtu\u00e1ln\u00edch adres kon\u010dily chybou. Pro vy\u0159e\u0161en\u00ed tohoto probl\u00e9mu bylo nutn\u00e9 p\u0159idat dal\u0161\u00ed funkci pro p\u0159evod adres.<\/p>\n

T\u00edmto probl\u00e9my neskon\u010dily a uk\u00e1zala se specifika v pr\u00e1ci DMA - ve v\u0161ech d\u0159\u00edve podporovan\u00fdch platform\u00e1ch v Xen (x86, ARM a ARM64) se adresy DMA a fyzick\u00e9 adresy v\u017edy shodovaly, ale v Raspberry Pi 4 byly odli\u0161n\u00e9. Naj\u00edt \u0159e\u0161en\u00ed pro tento probl\u00e9m se uk\u00e1zalo jako nejobt\u00ed\u017en\u011bj\u0161\u00ed a vy\u017eadovalo v\u00fdvoj patch\u016f pro kernel Linux, kter\u00e9 prov\u00e1d\u011bly p\u0159evod mezi fyzick\u00fdmi adresami a adresami DMA. <\/p>\n

P\u0159ipraven\u00e9 opravy byly sou\u010d\u00e1st\u00ed j\u00e1dra Linux 5.9 a nyn\u00ed je Xen uzn\u00e1v\u00e1n jako p\u0159ipraven\u00fd pro organizaci virtualizace na desk\u00e1ch Raspberry Pi 4. Na Raspberry Pi 4 je nyn\u00ed mo\u017en\u00e9 pou\u017e\u00edvat EVE<\/a><\/noindex> (Edge Virtualization Engine), engine pro vytv\u00e1\u0159en\u00ed a spou\u0161t\u011bn\u00ed cloud-native aplikac\u00ed, kter\u00fd vyu\u017e\u00edv\u00e1 Xen, Linuxkit<\/a><\/noindex> a Alpine Linux<\/a><\/noindex> pro v\u00fdstavbu virtualiza\u010dn\u00ed infrastruktury na p\u0159enosn\u00fdch za\u0159\u00edzen\u00edch.<\/p>\n

D\u00e1le lze zm\u00ednit odstran\u011bn\u00ed 10 zranitelnost\u00ed<\/a><\/noindex> v Xen. Zranitelnosti CVE-2020-25599<\/a><\/noindex>,
\nCVE-2020-25603<\/a><\/noindex> a
\nCVE-2020-25595<\/a><\/noindex>
\n potenci\u00e1ln\u011b umo\u017e\u0148uj\u00ed z hostovan\u00e9 syst\u00e9mu z\u00edskat opr\u00e1vn\u011bn\u00ed hostitelsk\u00e9ho prost\u0159ed\u00ed. Probl\u00e9my
\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> a
\nCVE-2020-25602<\/a><\/noindex>
\nse omezuj\u00ed na prov\u00e1d\u011bn\u00ed odm\u00edtnut\u00ed slu\u017eby.<\/p>\n

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

Zdroj: 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 \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 […]<\/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\udd47V hypervizoru Xen byla implementov\u00e1na podpora pro desku Raspberry Pi 4 | ProHoster","description":"V\u00fdvoj\u00e1\u0159i projektu Xen ozn\u00e1mili zaveden\u00ed mo\u017enosti pou\u017eit\u00ed Xen Hypervisor na z\u00e1kladn\u00edch 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