{"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\/pl\/blog\/news\/v-gipervizore-xen-realizovana-podderzhka-platy-raspberry-pi-4","title":{"rendered":"W hipernadzorze Xen wdro\u017cono wsparcie dla p\u0142yty Raspberry Pi 4","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Programi\u015bci projektu Xen <noindex><a rel=\"nofollow\" href=\"https:\/\/xenproject.org\/2020\/09\/29\/xen-on-raspberry-pi-4-adventures\/\">og\u0142osili<\/a><\/noindex> og\u0142osili wdro\u017cenie mo\u017cliwo\u015bci korzystania z Xen Hypervisor na p\u0142ytkach Raspberry Pi 4. Dostosowanie Xen do dzia\u0142ania na wcze\u015bniejszych wersjach p\u0142ytek Raspberry Pi utrudnia\u0142o zastosowanie niestandardowego kontrolera przerwa\u0144, kt\u00f3ry nie mia\u0142 wsparcia dla wirtualizacji. Na Raspberry Pi 4 zastosowano standardowy kontroler przerwa\u0144 GIC-400, kt\u00f3ry jest wspierany w Xen, a programi\u015bci liczyli, \u017ce nie b\u0119dzie problem\u00f3w z uruchomieniem Xen. Jednak w rzeczywisto\u015bci okaza\u0142o si\u0119, \u017ce sytuacja jest bardziej skomplikowana i aby zapewni\u0107 dzia\u0142anie Xen na Raspberry Pi 4, konieczne by\u0142o wprowadzenie znacz\u0105cych zmian w kodzie zarz\u0105dzaj\u0105cym pami\u0119ci\u0105.<\/p>\n<p> Pierwsze wersje p\u0142yt Raspberry Pi 4 ogranicza\u0142y dost\u0119p tylko do pierwszego gigabajta pami\u0119ci, co okaza\u0142o si\u0119 niewystarczaj\u0105ce dla Dom0. Konieczne zmiany zosta\u0142y wprowadzone w wydaniu Xen 4.14, ale natychmiast pojawi\u0142 si\u0119 kolejny problem \u2014 w podsystemie Xen do przekszta\u0142cania adres\u00f3w wirtualnych na fizyczne u\u017cywano wywo\u0142ania virt_to_phys, kt\u00f3re nie dzia\u0142a\u0142o dla wszystkich adres\u00f3w wirtualnych, a pr\u00f3by konwersji niekt\u00f3rych adres\u00f3w wirtualnych ko\u0144czy\u0142y si\u0119 b\u0142\u0119dem. Aby rozwi\u0105za\u0107 ten problem, konieczne by\u0142o dodanie innej funkcji przekszta\u0142cania adres\u00f3w.<\/p>\n<p>Na tym problemy si\u0119 nie sko\u0144czy\u0142y, a pojawi\u0142a si\u0119 cecha dzia\u0142ania DMA \u2014 we wszystkich wcze\u015bniej wspieranych platformach w Xen (x86, ARM i ARM64) adresy DMA i adresy fizyczne zawsze by\u0142y identyczne, ale w Raspberry Pi 4 si\u0119 r\u00f3\u017cni\u0142y. Znalezienie rozwi\u0105zania tego problemu okaza\u0142o si\u0119 najtrudniejsze i wymaga\u0142o opracowania poprawek do j\u0105dra Linux, kt\u00f3re dokonuj\u0105 konwersji mi\u0119dzy adresami fizycznymi a adresami DMA. <\/p>\n<p>Przygotowane poprawki wesz\u0142y w sk\u0142ad j\u0105dra Linux 5.9 i teraz Xen jest uznawany za gotowy do wirtualizacji na p\u0142ytkach Raspberry Pi 4. W tym r\u00f3wnie\u017c na Raspberry Pi 4 mo\u017cna teraz u\u017cywa\u0107 <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/lf-edge\/eve\">EVE<\/a><\/noindex> (Edge Virtualization Engine), silnik do tworzenia i uruchamiania aplikacji cloud-native, wykorzystuj\u0105cy Xen, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/linuxkit\/linuxkit\">Linuxkit<\/a><\/noindex> i <noindex><a rel=\"nofollow\" href=\"https:\/\/alpinelinux.org\/\">Alpine Linux<\/a><\/noindex> do budowy infrastruktury wirtualizacji na urz\u0105dzeniach przeno\u015bnych.<\/p>\n<p>Dodatkowo warto zaznaczy\u0107 eliminacj\u0119 <noindex><a rel=\"nofollow\" href=\"https:\/\/xenbits.xen.org\/xsa\/\">10 luk w zabezpieczeniach<\/a><\/noindex> w Xen. Luki <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> i<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/xenbits.xen.org\/xsa\/advisory-337.html\">CVE-2020-25595<\/a><\/noindex><br \/>\n potencjalnie umo\u017cliwiaj\u0105 systemowi go\u015bcia uzyskanie uprawnie\u0144 \u015brodowiska hosta. Problemy<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> i<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/xenbits.xen.org\/xsa\/advisory-333.html\">CVE-2020-25602<\/a><\/noindex><br \/>\nograniczaj\u0105 si\u0119 do realizacji atak\u00f3w typu denial of service.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>\u0179r\u00f3d\u0142o: <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 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