{"id":53931,"date":"2019-12-13T00:00:00","date_gmt":"2019-12-12T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/vypusk-emulyatora-qemu-4-2"},"modified":"2020-02-18T14:01:52","modified_gmt":"2020-02-18T11:01:52","slug":"vypusk-emulyatora-qemu-4-2","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/vypusk-emulyatora-qemu-4-2","title":{"rendered":"Lan\u00e7amento do emulador QEMU 4.2","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/lists.nongnu.org\/archive\/html\/qemu-devel\/2019-12\/msg02579.html\">Apresentado<\/a><\/noindex> lan\u00e7amento do projeto <noindex><a rel=\"nofollow\" href=\"http:\/\/wiki.qemu.org\/Download\">QEMU 4.2<\/a><\/noindex>. Como emulador, o QEMU permite executar um programa compilado para uma plataforma de hardware em um sistema com uma arquitetura completamente diferente, por exemplo, executar um aplicativo para ARM em um PC compat\u00edvel com x86. No modo de virtualiza\u00e7\u00e3o, o desempenho da execu\u00e7\u00e3o do c\u00f3digo em um ambiente isolado \u00e9 pr\u00f3ximo ao de um sistema nativo, gra\u00e7as \u00e0 execu\u00e7\u00e3o direta de instru\u00e7\u00f5es na CPU e ao uso do hipervisor Xen ou do m\u00f3dulo KVM. <\/p>\n<p>O projeto foi inicialmente criado por Fabrice Bellard com o objetivo de permitir a execu\u00e7\u00e3o de arquivos execut\u00e1veis Linux compilados para a plataforma x86 em arquiteturas diferentes da x86. Ao longo dos anos de desenvolvimento, foi adicionada suporte para emula\u00e7\u00e3o completa de 14 arquiteturas de hardware, e o n\u00famero de dispositivos de hardware emulados ultrapassou 400. Para a vers\u00e3o 4.2, foram feitas mais de 2200 altera\u00e7\u00f5es por 198 desenvolvedores. <\/p>\n<p>Principais <noindex><a rel=\"nofollow\" href=\"http:\/\/wiki.qemu.org\/ChangeLog\/4.2\">s\u00e3o<\/a><\/noindex>, adicionadas no QEMU 4.2:\n<\/p>\n<ul>\n<li class=\"l\"> O gerador de c\u00f3digo cl\u00e1ssico TCG (Tiny Code Generator) agora suporta plugins para monitorar instru\u00e7\u00f5es de CPU e endere\u00e7os na mem\u00f3ria;\n<li class=\"l\">  No driver de dispositivos de bloco <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/qemu\/qemu\/blob\/master\/qemu-nbd.c\">NBD<\/a><\/noindex> (Network Block Device) foi garantido um processamento mais eficiente das solicita\u00e7\u00f5es de c\u00f3pia durante a leitura (copy-on-read). O c\u00f3digo do servidor NBD foi otimizado para c\u00f3pias de imagens esparsas (com lacunas). Melhorias gerais foram feitas na implementa\u00e7\u00e3o do cliente e do servidor NBD;\n<li class=\"l\"> O desempenho da criptografia de discos LUKS usando o algoritmo AES-XTS foi melhorado;\n<li class=\"l\"> No vfio-pci foi adicionada a suporte para a propriedade &#171;failover_pair_id&#187; para simplificar a migra\u00e7\u00e3o de dispositivos VFIO;\n<li class=\"l\"> No virtio-mmio, foi adicionada a suporte para o padr\u00e3o virtio-compatible 2 e um mecanismo definido na especifica\u00e7\u00e3o virtio 1.1 para filas virtuais empacotadas (<noindex><a rel=\"nofollow\" href=\"https:\/\/docs.oasis-open.org\/virtio\/virtio\/v1.1\/csprd01\/virtio-v1.1-csprd01.html#x1-230005\">virtqueue<\/a><\/noindex>) para a troca de dados com dispositivos virtuais de entrada\/sa\u00edda em modo de batelada;\n<li class=\"l\"> No emulador da arquitetura x86, foi adicionado um novo tipo de m\u00e1quinas emuladas &#171;microvm&#187;, que utilizam virtio-mmio em vez de PCI para otimiza\u00e7\u00e3o de desempenho. Implementada a possibilidade de habilitar e desabilitar VMX atrav\u00e9s das flags &#171;-cpu&#187;. Adicionada suporte para emula\u00e7\u00e3o de extens\u00f5es AVX512 BFloat16. Garantida suporte para novos modelos de CPU Denverton (SoC servidor baseado em Atom), Snowridge e Dhyana. Estabilizada a suporte para o macOS Hypervisor Framework (&#171;-accel hvf&#187;);\n<li class=\"l\"> No emulador da arquitetura ARM, foi adicionada a suporte para emula\u00e7\u00e3o do SoC Aspeed AST2600 (&#171;ast2600-evb&#187;). Adicionada suporte para a tecnologia Semihosting 2.0 com extens\u00f5es STDOUT_STDERR\/EXIT_EXTENDED, que permite que o dispositivo emulado utilize stdout, stderr e stdin para criar arquivos do lado do host. No KVM, adicionada a possibilidade de usar mais de 256 CPU e garantida suporte para instru\u00e7\u00f5es SIMD SVE. Em m\u00e1quinas virtuais do tipo &#171;<noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/qemu\/qemu\/blob\/master\/hw\/arm\/virt.c\">virt<\/a><\/noindex>&#187; foi implementada a suporte para conex\u00e3o a quente de mem\u00f3ria. Aumentada a performance da emula\u00e7\u00e3o utilizando o gerador de c\u00f3digo TCG.\n<li class=\"l\"> No emulador da arquitetura PowerPC, foi adicionada a possibilidade de emular instru\u00e7\u00f5es POWER9 mffsce, mffscrn e mffscrni. Nas m\u00e1quinas emuladas &#171;powernv&#187;, adicionada suporte para dispositivos de sistema Homer e OCC SRAM;\n<li class=\"l\"> No emulador da arquitetura RISC-V, foi adicionada a op\u00e7\u00e3o &#171;-initrd&#187; e a possibilidade de visualizar todo o estado da arquitetura no depurador;\n<li class=\"l\"> No emulador da arquitetura s390, foi implementado suporte para as instru\u00e7\u00f5es IEP (Instruction Execution Protection);\n<li class=\"l\"> No emulador da arquitetura 68k, foi adicionada a capacidade inicial de emular o Macintosh Quadro 800 e sistemas cl\u00e1ssicos NeXTcube;\n<li class=\"l\"> No emulador da arquitetura xtensa, foi adicionado um novo tipo de m\u00e1quinas emuladas &#171;virt&#187; e garantida suporte para ABI call0 para emula\u00e7\u00e3o no espa\u00e7o do usu\u00e1rio.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52023\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0440\u0435\u043b\u0438\u0437 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 QEMU 4.2. \u0412 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u044d\u043c\u0443\u043b\u044f\u0442\u043e\u0440\u0430 QEMU \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0437\u0430\u043f\u0443\u0441\u0442\u0438\u0442\u044c \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0443, \u0441\u043e\u0431\u0440\u0430\u043d\u043d\u0443\u044e \u0434\u043b\u044f \u043e\u0434\u043d\u043e\u0439 \u0430\u043f\u043f\u0430\u0440\u0430\u0442\u043d\u043e\u0439 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b, \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0441 \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u043d\u043e \u0438\u043d\u043e\u0439 \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u043e\u0439, \u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0435 \u0434\u043b\u044f ARM \u043d\u0430 x86-\u0441\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u043e\u043c \u041f\u041a. \u0412 \u0440\u0435\u0436\u0438\u043c\u0435 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0432 QEMU \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u0432 \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u0438 \u0431\u043b\u0438\u0437\u043a\u0430 \u043a \u043d\u0430\u0442\u0438\u0432\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0437\u0430 \u0441\u0447\u0451\u0442 \u043f\u0440\u044f\u043c\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0438\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u0439 \u043d\u0430 CPU \u0438 \u0437\u0430\u0434\u0435\u0439\u0441\u0442\u0432\u043e\u0432\u0430\u043d\u0438\u044f [&hellip;]<\/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-53931","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0440\u0435\u043b\u0438\u0437 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 QEMU.\" \/>\n\t<meta name=\"robots\" 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