{"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\/en\/blog\/news\/v-gipervizore-xen-realizovana-podderzhka-platy-raspberry-pi-4","title":{"rendered":"The Xen hypervisor supports the Raspberry Pi 4 board.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

The developers of the Xen project announced<\/a><\/noindex> regarding the implementation of the possibility of using the Xen Hypervisor on Raspberry Pi 4 boards. The adaptation of Xen for operation on previous versions of Raspberry Pi boards was hindered by the use of a non-standard interrupt controller that did not support virtualization. The Raspberry Pi 4 used a standard GIC-400 interrupt controller, which is supported in Xen, and the developers expected there would be no issues in launching Xen. However, things turned out differently than anticipated, and significant code modifications were required to work with memory on the Raspberry Pi 4.<\/p>\n

The initial versions of the Raspberry Pi 4 limited access to only the first gigabyte of memory space, which was insufficient for Dom0. The necessary changes were made in the release of Xen 4.14, but another issue immediately arose \u2014 in the Xen subsystem for converting virtual addresses to physical addresses, a call to virt_to_phys was used, which did not work for all virtual addresses, and attempts to convert some virtual addresses encountered errors. To resolve this issue, another address conversion function had to be added.<\/p>\n

This was not the end of the problems, as a peculiarity in the operation of DMA arose \u2014 in all previously supported platforms in Xen (x86, ARM, and ARM64), DMA addresses and physical addresses always matched, but in the Raspberry Pi 4, they differed. Finding a solution for this issue proved to be the most challenging and required the development of patches for the Linux kernel that performed the conversion between physical addresses and DMA addresses. <\/p>\n

The prepared fixes were incorporated into the Linux kernel 5.9, and now Xen is recognized as ready for virtualization on Raspberry Pi 4 boards. In particular, on the Raspberry Pi 4, it is now possible to use EVE<\/a><\/noindex> (Edge Virtualization Engine), a framework for creating and running cloud-native applications that use Xen, Linuxkit<\/a><\/noindex> and Alpine Linux<\/a><\/noindex> to build virtualization infrastructure on portable devices.<\/p>\n

Additionally, it is noteworthy that 10 vulnerabilities<\/a><\/noindex> in Xen have been addressed. The vulnerabilities CVE-2020-25599<\/a><\/noindex>,
\nCVE-2020-25603<\/a><\/noindex> and
\nCVE-2020-25595<\/a><\/noindex>
\n potentially allow a guest system to gain host environment privileges. The issues
\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> and
\nCVE-2020-25602<\/a><\/noindex>
\nare limited to denial of service.<\/p>\n

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

Source: 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\udd47Xen Hypervisor now supports Raspberry Pi 4 | ProHoster","description":"The developers of the Xen project announced the implementation of Xen Hypervisor support on 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