{"id":115180,"date":"2024-04-19T14:30:12","date_gmt":"2024-04-19T12:30:12","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/dlya-xen-razvivaetsya-mehanizm-paravirtualizaczii-iommu"},"modified":"2024-04-19T14:30:12","modified_gmt":"2024-04-19T12:30:12","slug":"dlya-xen-razvivaetsya-mehanizm-paravirtualizaczii-iommu","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/dlya-xen-razvivaetsya-mehanizm-paravirtualizaczii-iommu","title":{"rendered":"Pro Xen se vyv\u00edj\u00ed mechanismus paravirtualizace IOMMU","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V\u00fdvoj\u00e1\u0159i projektu XCP-NG, kter\u00fd vytv\u00e1\u0159\u00ed otev\u0159enou platformu pro nasazen\u00ed a spr\u00e1vu cloudov\u00e9 infrastruktury, p\u0159edstavili projekt PV-IOMMU. Ten umo\u017e\u0148uje hostitelsk\u00fdm syst\u00e9m\u016fm p\u0159\u00edstup k omezen\u00e9 funk\u010dnosti IOMMU, realizovan\u00e9 pomoc\u00ed infrastruktury paravirtualizace Xen. V praxi m\u016f\u017ee b\u00fdt PV-IOMMU aplikov\u00e1no pro implementaci ochrany DMA v Dom0 nebo pro zaji\u0161t\u011bn\u00ed podpory subsyst\u00e9mu j\u00e1dra Linux VFIO. D\u0159\u00edve hypervizor Xen pou\u017e\u00edval IOMMU k p\u0159\u00edm\u00e9mu p\u0159\u00edstupu k PCI za\u0159\u00edzen\u00edm a omezen\u00ed p\u0159\u00edstupu za\u0159\u00edzen\u00ed k pam\u011bti, ale z d\u016fvod\u016f stability a bezpe\u010dnosti nemohly hostitelsk\u00e9 syst\u00e9my p\u0159\u00edmo p\u0159istupovat k IOMMU bloku poskytovan\u00e9mu hardwarem. <\/p>\n

IOMMU je specializovan\u00e1 jednotka pro spr\u00e1vu pam\u011bti, kter\u00e1 prov\u00e1d\u00ed p\u0159eklad virtu\u00e1ln\u00edch adres, kter\u00e9 jsou viditeln\u00e9 hardwarov\u00fdm za\u0159\u00edzen\u00edm, na fyzick\u00e9 adresy, co\u017e umo\u017e\u0148uje prov\u00e1d\u011bt a filtrovat operace DMA podle virtu\u00e1ln\u00edch adres a tak\u00e9 omezovat a izolovat operace vstupu a v\u00fdstupu. V kontextu virtualizace IOMMU umo\u017e\u0148uje hostitelsk\u00fdm syst\u00e9m\u016fm p\u0159\u00edm\u00fd p\u0159\u00edstup ke perifern\u00edm za\u0159\u00edzen\u00edm, jako jsou Ethernetov\u00e9 adapt\u00e9ry, grafick\u00e9 karty a \u0159adi\u010de \u00falo\u017ei\u0161\u0165. Implementace IOMMU od spole\u010dnosti Intel je zn\u00e1ma jako VT-d («Virtualization Technology for Directed I\/O»), od AMD jako AMD-Vi (I\/O Virtualization) a od ARM jako SMMU (System Memory Management Unit). <\/p>\n

Navr\u017een\u00e1 paravirtualizovan\u00e1 realizace (PV-IOMMU) umo\u017e\u0148uje hostitelsk\u00fdm syst\u00e9m\u016fm vyu\u017e\u00edvat z\u00e1kladn\u00ed mo\u017enosti IOMMU, ale z\u00e1rove\u0148 abstrahuje v\u0161echny n\u00edzko\u00farov\u0148ov\u00e9 hardwarov\u00e9 detaily. Pro za\u0159azen\u00ed do Xen byl navr\u017een nov\u00fd hypercall (analog system call pro hypervizory) HYPERVISOR_iommu_op, kter\u00fd mohou hostitelsk\u00e9 syst\u00e9my pou\u017e\u00edvat k prov\u00e1d\u011bn\u00ed operac\u00ed IOMMU. Mezi jin\u00fdmi v\u011bcmi mohou nyn\u00ed hostitelsk\u00e9 syst\u00e9my vytv\u00e1\u0159et a m\u011bnit dom\u00e9ny<\/a> IOMMU (IOMMU domain), ozna\u010dovan\u00e9 v Xen jako kontexty IOMMU (IOMMU context), aby se p\u0159ede\u0161lo z\u00e1m\u011bn\u011b s term\u00ednem «dom\u00e9na» v Xen. Kontexty IOMMU umo\u017e\u0148uj\u00ed uspo\u0159\u00e1dat p\u0159\u00edstup hostitelsk\u00e9ho syst\u00e9mu k pam\u011bti za\u0159\u00edzen\u00ed a stanovovat operace p\u0159eklad\u016f pam\u011bti, je\u017e se aplikuj\u00ed na jedno nebo v\u00edce za\u0159\u00edzen\u00ed. <\/p>\n

V sou\u010dasn\u00e9 f\u00e1zi v\u00fdvoje podporuje PV-IOMMU pouze technologii Intel VT-d, ale brzy se pl\u00e1nuje p\u0159id\u00e1n\u00ed podpory pro AMD-Vi a SMMUv3.
\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 XCP-NG, \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u0443\u044e \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u0443 \u0434\u043b\u044f \u0440\u0430\u0437\u0432\u0435\u0440\u0442\u044b\u0432\u0430\u043d\u0438\u044f \u0438 \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0440\u0430\u0431\u043e\u0442\u043e\u0439 \u043e\u0431\u043b\u0430\u0447\u043d\u043e\u0439 \u0438\u043d\u0444\u0440\u0430\u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u043e\u0439, \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0438 \u043f\u0440\u043e\u0435\u043a\u0442 PV-IOMMU, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0439 \u0433\u043e\u0441\u0442\u0435\u0432\u044b\u043c \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u043c \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0434\u043e\u0441\u0442\u0443\u043f \u043a \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u043d\u043e\u0439 \u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u0438 IOMMU, \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u043e\u0439 \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c \u0438\u043d\u0444\u0440\u0430\u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u044b \u043f\u0430\u0440\u0430\u0432\u0438\u0440\u0442\u0443\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 Xen. \u041d\u0430 \u043f\u0440\u0430\u043a\u0442\u0438\u043a\u0435 PV-IOMMU \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0442\u044c\u0441\u044f \u0434\u043b\u044f \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0437\u0430\u0449\u0438\u0442\u044b DMA \u0432 Dom0 \u0438\u043b\u0438 \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0438 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u044b \u044f\u0434\u0440\u0430 Linux VFIO. \u0420\u0430\u043d\u0435\u0435 \u0433\u0438\u043f\u0435\u0440\u0432\u0438\u0437\u043e\u0440 Xen \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043b IOMMU \u0434\u043b\u044f […]<\/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-115180","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\udd47Pro Xen se vyv\u00edj\u00ed mechanismus paravirtualizace IOMMU | 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