{"id":111676,"date":"2023-11-21T15:10:42","date_gmt":"2023-11-21T13:10:42","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-gipervizora-xen-4-18"},"modified":"2023-11-21T15:10:42","modified_gmt":"2023-11-21T13:10:42","slug":"vypusk-gipervizora-xen-4-18","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/vypusk-gipervizora-xen-4-18","title":{"rendered":"Lan\u00e7amento do hypervisor Xen 4.18","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Ap\u00f3s 11 meses de desenvolvimento, foi lan\u00e7ado o hypervisor livre Xen 4.18. O novo lan\u00e7amento contou com a participa\u00e7\u00e3o de empresas como Amazon, Arm, Bitdefender, Citrix, EPAM Systems e AMD. A forma\u00e7\u00e3o de atualiza\u00e7\u00f5es para a vers\u00e3o Xen 4.18 continuar\u00e1 at\u00e9 16 de maio de 2025, e a publica\u00e7\u00e3o de corre\u00e7\u00f5es de vulnerabilidades ocorrer\u00e1 at\u00e9 16 de novembro de 2026.      <\/p>\n<p>Principais mudan\u00e7as no Xen 4.18:   <\/p>\n<ul>\n<li class=\"l\"> Foram adicionadas implementa\u00e7\u00f5es iniciais de portas para arquiteturas RISC-V e Power (ppc64le). Ambientes de teste para portas RISC-V e Power foram implantados no sistema de integra\u00e7\u00e3o cont\u00ednua GitLab CI.\n<li class=\"l\"> Ao operar em sistemas ARM64, a subsistema de mem\u00f3ria do Xen considerou as particularidades da arquitetura ARM. Adicionada o suporte experimental para instru\u00e7\u00f5es vetoriais SVE (Scalable Vector Extension). Adicionado um conjunto de ferramentas Arm Firmware Framework para a arquitetura ARM A-profile (ARM Application-profile, FF-A). Foi adicionada a possibilidade experimental de adicionar e remover n\u00f3s dinamicamente na \u00e1rvore de dispositivos do Xen usando arquivos .dtbo.\n<li class=\"l\"> Em sistemas com processadores Intel, o par\u00e2metro MSR_ARCH_CAPS agora \u00e9 vis\u00edvel em sistemas convidados e pode ser configurado atrav\u00e9s do arquivo de configura\u00e7\u00e3o da m\u00e1quina virtual. Em processadores lan\u00e7ados a partir de 2019, o par\u00e2metro MSR_ARCH_CAPS permite saber quais corre\u00e7\u00f5es de vulnerabilidades relacionadas \u00e0 execu\u00e7\u00e3o especulativa foram aplicadas.\n<li class=\"l\"> Adicionado suporte para a extens\u00e3o CPUID_USER_DIS (CPUID Faulting), introduzida na quarta gera\u00e7\u00e3o de processadores AMD EPYC para controlar a capacidade de visualizar dados CPUID a partir de um sistema convidado paravirtualizado.\n<li class=\"l\"> Adicionado suporte para extens\u00f5es que surgiram em processadores Intel baseados na microarquitetura Sapphire Rapids:\n<ul>\n<li class=\"l\"> Para sistemas convidados em modo HVM e PVH, foi adicionado suporte ao mecanismo PKS (Protection Key Supervisor), que amplia as capacidades de prote\u00e7\u00e3o das p\u00e1ginas de mem\u00f3ria.\n<li class=\"l\"> Para evitar a parada total do sistema em caso de problemas com bloqueios microarquitet\u00f4nicos, foi utilizado o mecanismo VM-Notify.\n<li class=\"l\"> Adicionada prote\u00e7\u00e3o contra bloqueios de barramento resultantes do uso incorreto de instru\u00e7\u00f5es at\u00f4micas no sistema convidado (inclu\u00eddo rate-limit).    <\/ul>\n<li class=\"l\"> Suporte adicionado para instru\u00e7\u00f5es AVX512-FP16, que apareceram em CPUs Intel baseadas na microarquitetura Granite Rapids.\n<li class=\"l\"> Adicionado o driver cpufreq, que utiliza o mecanismo HWP (Hardware P-States) para controlar o consumo de energia e a frequ\u00eancia dos processadores Intel.\n<li class=\"l\"> Foi implementado o suporte \u00e0 execu\u00e7\u00e3o for\u00e7ada de opera\u00e7\u00f5es do sistema no modo DOITM (Data Operand Independent Timing Mode), garantindo um tempo de execu\u00e7\u00e3o constante para instru\u00e7\u00f5es, independente dos dados processados nelas.\n<li class=\"l\"> A implementa\u00e7\u00e3o dos requisitos para o desenvolvimento de softwares seguros e confi\u00e1veis na linguagem C, conforme especifica\u00e7\u00f5es MISRA-C para sistemas cr\u00edticos, foi continuada. O n\u00famero de diretrizes MISRA-C introduzidas no Xen aumentou de 4 para 6, e o n\u00famero de regras de 24 para 65 (no total, a especifica\u00e7\u00e3o cont\u00e9m 16 diretrizes e 143 regras).\n<li class=\"l\"> Na ferramenta xl\/libxl, foi adicionada a possibilidade de modificar as configura\u00e7\u00f5es SMBIOS para sistemas convidados no modo HVM.\n<li class=\"l\"> Foram adicionadas duas novas hipercalls para vincular o estado de opera\u00e7\u00e3o e as \u00e1reas temporais do vCPU a endere\u00e7os f\u00edsicos, em vez de endere\u00e7os virtuais.          <\/ul>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=60153\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 11 \u043c\u0435\u0441\u044f\u0446\u0435\u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0440\u0435\u043b\u0438\u0437 \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u0433\u0438\u043f\u0435\u0440\u0432\u0438\u0437\u043e\u0440\u0430 Xen 4.18. \u0412 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u043d\u043e\u0432\u043e\u0433\u043e \u0432\u044b\u043f\u0443\u0441\u043a\u0430 \u043f\u0440\u0438\u043d\u044f\u043b\u0438 \u0443\u0447\u0430\u0441\u0442\u0438\u0435 \u0442\u0430\u043a\u0438\u0435 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438, \u043a\u0430\u043a Amazon, Arm, Bitdefender, Citrix, EPAM Systems \u0438 AMD. \u0424\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0439 \u0434\u043b\u044f \u0432\u0435\u0442\u043a\u0438 Xen 4.18 \u043f\u0440\u043e\u0434\u043b\u0438\u0442\u0441\u044f \u0434\u043e 16 \u043c\u0430\u044f 2025 \u0433\u043e\u0434\u0430, \u0430 \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u044f \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0434\u043e 16 \u043d\u043e\u044f\u0431\u0440\u044f 2026 \u0433\u043e\u0434\u0430. \u041a\u043b\u044e\u0447\u0435\u0432\u044b\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0432 Xen 4.18: \u0414\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u044b \u043d\u0430\u0447\u0430\u043b\u044c\u043d\u044b\u0435 [&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-111676","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - 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