{"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\/ro\/blog\/news\/dlya-xen-razvivaetsya-mehanizm-paravirtualizaczii-iommu","title":{"rendered":"Pentru Xen se dezvolt\u0103 un mecanism de paravirtualizare IOMMU","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Dezvoltatorii proiectului XCP-NG, care dezvolt\u0103 o platform\u0103 liber\u0103 pentru implementarea \u0219i gestionarea unei infrastructuri cloud, au prezentat proiectul PV-IOMMU, care permite sistemelor gazd\u0103 s\u0103 acceseze func\u021bionalitatea limitat\u0103 a IOMMU, realizat\u0103 folosind infrastructura de paravirtualizare Xen. \u00cen practic\u0103, PV-IOMMU poate fi utilizat pentru a implementa protec\u021bia DMA \u00een Dom0 sau pentru a asigura suportul pentru subsistemul de kernel Linux VFIO. Anterior, hipervizorul Xen utiliza IOMMU pentru a redirec\u021biona accesul la dispozitive PCI \u0219i pentru a limita accesul dispozitivelor la memorie, dar din motive de stabilitate \u0219i securitate, sistemele gazd\u0103 nu au putut accesa direct blocul IOMMU furnizat de hardware. <\/p>\n

IOMMU este un bloc specializat de control al memoriei, care realizeaz\u0103 traducerea adreselor virtuale vizibile pentru dispozitivele hardware \u00een adrese fizice, permi\u021b\u00e2nd realizarea \u0219i filtrarea opera\u021biunilor DMA pe adrese virtuale \u0219i, de asemenea, restric\u021bion\u00e2nd \u0219i izol\u00e2nd opera\u021biunile de intrare-ie\u0219ire. \u00cen contextul virtualiz\u0103rii, IOMMU permite sistemelor gazd\u0103 s\u0103 acceseze direct perifericele, cum ar fi adaptoarele Ethernet, pl\u0103cile grafice \u0219i controlerele de stocare. Implementarea IOMMU de la Intel este denumit\u0103 VT-d (Virtualization Technology for Directed I\/O), AMD - AMD-Vi (I\/O Virtualization), iar ARM - SMMU (System Memory Management Unit). <\/p>\n

Implementarea paravirtualizat\u0103 propus\u0103 (PV-IOMMU) permite sistemelor gazd\u0103 s\u0103 utilizeze capabilit\u0103\u021bile de baz\u0103 ale IOMMU, dar abstreaz\u0103 toate detaliile hardware de nivel inferior. Pentru integrarea \u00een Xen, a fost propus un nou hipervizor (analog cu apelul de sistem pentru hipervizoare) HYPERVISOR_iommu_op, pe care sistemele gazd\u0103 \u00eel pot folosi pentru a efectua opera\u021biuni IOMMU. Printre altele, sistemele gazd\u0103 pot acum s\u0103 creeze \u0219i s\u0103 modifice domenii<\/a> IOMMU (domeniul IOMMU), denumite \u00een Xen contexte IOMMU pentru a evita confuzia cu termenul \u201edomeniu\u201d \u00een Xen. Contextele IOMMU permit organizarea accesului sistemului gazd\u0103 la memoria dispozitivelor \u0219i definirea opera\u021biunilor de traducere a memoriei aplicate unui sau mai multor dispozitive. <\/p>\n

\u00cen aceast\u0103 etap\u0103 de dezvoltare, \u00een PV-IOMMU este suportat\u0103 numai tehnologia Intel VT-d, dar \u00een cur\u00e2nd se planific\u0103 ad\u0103ugarea suportului pentru AMD-Vi \u0219i SMMUv3.
\n
Sursa: opennet.ro<\/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\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\udd47Pentru Xen, se dezvolt\u0103 un mecanism de paravirtualizare IOMMU | 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