{"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\/pt\/blog\/news\/dlya-xen-razvivaetsya-mehanizm-paravirtualizaczii-iommu","title":{"rendered":"Para o Xen, est\u00e1 sendo desenvolvido um mecanismo de paravirtualiza\u00e7\u00e3o IOMMU","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Os desenvolvedores do projeto XCP-NG, que desenvolve uma plataforma livre para a implementa\u00e7\u00e3o e gerenciamento de uma infraestrutura em nuvem, apresentaram o projeto PV-IOMMU, que permite que sistemas convidados acessem funcionalidades limitadas do IOMMU, implementadas usando a infraestrutura de paravirtualiza\u00e7\u00e3o Xen. Na pr\u00e1tica, o PV-IOMMU pode ser utilizado para implementar prote\u00e7\u00e3o DMA no Dom0 ou para garantir suporte ao subsistema do n\u00facleo Linux VFIO. Anteriormente, o hipervisor Xen usava IOMMU para passar acesso a dispositivos PCI e restringir o acesso dos dispositivos \u00e0 mem\u00f3ria, mas, por quest\u00f5es de estabilidade e seguran\u00e7a, os sistemas convidados n\u00e3o podiam acessar diretamente o bloco IOMMU fornecido pelo hardware. <\/p>\n

IOMMU \u00e9 um bloco especializado de gerenciamento de mem\u00f3ria que realiza a tradu\u00e7\u00e3o de endere\u00e7os virtuais vis\u00edveis ao hardware em endere\u00e7os f\u00edsicos, permitindo executar e filtrar opera\u00e7\u00f5es DMA em endere\u00e7os virtuais, al\u00e9m de limitar e isolar opera\u00e7\u00f5es de entrada e sa\u00edda. No contexto da virtualiza\u00e7\u00e3o, o IOMMU permite que sistemas convidados acessem diretamente dispositivos perif\u00e9ricos, como adaptadores Ethernet, placas gr\u00e1ficas e controladores de armazenamento. A implementa\u00e7\u00e3o do IOMMU pela Intel \u00e9 conhecida como VT-d (\"Virtualization Technology for Directed I\/O\"), pela AMD \u00e9 chamada AMD-Vi (I\/O Virtualization), e pela ARM, SMMU (System Memory Management Unit). <\/p>\n

A implementa\u00e7\u00e3o paravirtualizada proposta (PV-IOMMU) permite que os sistemas convidados utilizem as funcionalidades b\u00e1sicas do IOMMU, mas abstrai todos os detalhes de hardware de baixo n\u00edvel. Para inclus\u00e3o no Xen, foi proposto um novo hiperchamado (an\u00e1logo a chamadas de sistema para hipervisores) HYPERVISOR_iommu_op, que os sistemas convidados podem usar para realizar opera\u00e7\u00f5es de IOMMU. Entre outras coisas, os sistemas convidados agora podem criar e modificar dom\u00ednios<\/a> IOMMU (dom\u00ednio IOMMU), chamados de contextos IOMMU no Xen para evitar confus\u00e3o com o termo \"dom\u00ednio\" no Xen. Os contextos IOMMU permitem organizar o acesso do sistema convidado \u00e0 mem\u00f3ria dos dispositivos e definir as opera\u00e7\u00f5es de tradu\u00e7\u00e3o de mem\u00f3ria aplicadas a um ou v\u00e1rios dispositivos. <\/p>\n

Na fase atual de desenvolvimento do PV-IOMMU, apenas a tecnologia Intel VT-d \u00e9 suportada, mas em breve est\u00e1 prevista a adi\u00e7\u00e3o do suporte a AMD-Vi e SMMUv3.
\n
Fonte: 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\udd47Um mecanismo de paravirtualiza\u00e7\u00e3o IOMMU est\u00e1 sendo desenvolvido para 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