{"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\/nl\/blog\/news\/dlya-xen-razvivaetsya-mehanizm-paravirtualizaczii-iommu","title":{"rendered":"Voor Xen wordt een IOMMU-paravirtualisatiemechanisme ontwikkeld.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

De ontwikkelaars van het XCP-NG-project, dat een vrij platform voor het implementeren en beheren van cloudinfrastructuur ontwikkelt, hebben het PV-IOMMU-project gepresenteerd. Dit stelt gastsystemen in staat om toegang te krijgen tot beperkte IOMMU-functionaliteit, die is gerealiseerd met behulp van de paravirtualisatie-infrastructuur Xen. In de praktijk kan PV-IOMMU worden gebruikt voor de implementatie van DMA-bescherming in Dom0 of om ondersteuning te bieden voor de Linux-kernel VFIO-subsystemen. Eerder gebruikte de hypervisor Xen IOMMU voor het doorsturen van toegang tot PCI-apparaten en het beperken van de toegang van apparaten tot geheugen, maar omwille van stabiliteit en veiligheid konden gastsystemen niet direct communiceren met de hardwarematige IOMMU-eenheid. <\/p>\n

IOMMU is een gespecialiseerde geheugeneenheid die virtuele adressen, zichtbaar voor hardware-apparatuur, vertaalt naar fysieke adressen. Dit maakt het mogelijk om DMA-operaties te uitvoeren en te filteren op virtuele adressen, evenals om invoer-\/uitvoeroperaties te beperken en te isoleren. In de context van virtualisatie stelt IOMMU gastsystemen in staat om direct toegang te krijgen tot randapparatuur zoals Ethernet-adapters, grafische kaarten en opslagcontroller. De IOMMU-implementatie van Intel staat bekend als VT-d (\"Virtualization Technology for Directed I\/O\"), terwijl AMD dit AMD-Vi (I\/O Virtualization) noemt en ARM het SMMU (System Memory Management Unit). <\/p>\n

De voorgestelde paravirtualiseerde implementatie (PV-IOMMU) stelt gastsystemen in staat om gebruik te maken van de basisfunctionaliteiten van IOMMU, terwijl het tegelijkertijd alle laagdrempelige hardwaredetails abstracteert. Voor integratie in Xen is een nieuwe hypercall (vergelijkbaar met een systeemaanroep voor hypervisors) voorgesteld genaamd HYPERVISOR_iommu_op, die door gastsystemen kan worden gebruikt voor IOMMU-operaties. Onder andere kunnen gastsystemen nu IOMMU-domeinen aanmaken en wijzigen, domeinen<\/a> IOMMU (IOMMU-domein) wordt in Xen aangeduid als IOMMU-contexten om verwarring met de term \"domein\" in Xen te voorkomen. IOMMU-contexten maken het mogelijk om de toegang van een gast systeem tot de geheugen van apparaten te organiseren en de geheugenvertalingen vast te stellen die op \u00e9\u00e9n of meerdere apparaten van toepassing zijn. <\/p>\n

In de huidige ontwikkelingsfase ondersteunt PV-IOMMU alleen de Intel VT-d-technologie, maar op korte termijn is het de bedoeling om ondersteuning voor AMD-Vi en SMMUv3 toe te voegen.
\n
Bron: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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