{"id":148860,"date":"2025-11-19T17:11:54","date_gmt":"2025-11-19T15:11:54","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-gipervizora-xen-4-21"},"modified":"2025-11-19T17:11:54","modified_gmt":"2025-11-19T15:11:54","slug":"vypusk-gipervizora-xen-4-21","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/vypusk-gipervizora-xen-4-21","title":{"rendered":"Lan\u00e7amento do hypervisor Xen 4.21","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Ap\u00f3s 8 meses de desenvolvimento, foi lan\u00e7ado o release do hipervisor gratuito Xen 4.21. Empresas como Amazon, Arm, EPAM Systems e AMD participaram do desenvolvimento da nova vers\u00e3o. O c\u00f3digo do projeto \u00e9 escrito em C e \u00e9 distribu\u00eddo sob a licen\u00e7a GPLv2+. O desenvolvimento \u00e9 realizado sob a organiza\u00e7\u00e3o Linux Foundation.      <\/p>\n<p>Mudan\u00e7as principais no Xen 4.21:   <\/p>\n<ul>\n<li class=\"l\"> Foi garantido suporte completo ao modelo de dispositivos Linux stubdomain, permitindo a execu\u00e7\u00e3o de componentes para emula\u00e7\u00e3o de dispositivos sob um usu\u00e1rio n\u00e3o privilegiado. O modelo Linux stubomains foi desenvolvido pelo projeto QUBES OS e suporta o uso de drivers de emula\u00e7\u00e3o das \u00faltimas vers\u00f5es do QEMU, bem como as funcionalidades auxiliares dispon\u00edveis no QEMU para sistemas convidados.\n<li class=\"l\"> Mudan\u00e7as para sistemas baseados na arquitetura x86:\n<ul>\n<li class=\"l\"> Foi adicionado suporte a um novo algoritmo de compress\u00e3o da estrutura PDX (Page inDeX), que melhora o funcionamento do Xen em processadores Intel Sierra Forest e Granite Rapids com mapeamento f\u00edsico de mem\u00f3ria n\u00e3o linear (sparse memory map), permitindo a exist\u00eancia de \u00e1reas vazias.\n<li class=\"l\"> Foi adicionada a possibilidade de controlar o atributo de cache em MTRR (Memory Type Range Registers) para o registro BAR (Base Address Register) de dispositivos PCI b\u00e1sicos da plataforma Xen, utilizado por sistemas convidados em modo HVM. Por padr\u00e3o, em MTRR, a mem\u00f3ria refletida dos dispositivos PCI \u00e9 atribu\u00edda com o atributo UC (uncacheable), que faz sentido para dispositivos PCI reais, mas apenas diminui o desempenho do dispositivo PCI na plataforma Xen.\n<li class=\"l\"> Para processadores AMD, foi adicionado um novo driver amd-cppc\/amd-cppc-epp, que controla a altera\u00e7\u00e3o da frequ\u00eancia da CPU para alcan\u00e7ar desempenho otimizado. O driver utiliza o mecanismo CPPC (Collaborative Processor Performance Control), que, ao contr\u00e1rio do acpi-cpufreq, n\u00e3o \u00e9 limitado a tr\u00eas n\u00edveis de desempenho e permite uma resposta mais r\u00e1pida \u00e0s mudan\u00e7as de estado.\n<li class=\"l\"> Na vers\u00e3o da camada xenstore-stubdom, utilizada para executar o xenstored sem privil\u00e9gios do Dom0, foi implementado suporte para atualiza\u00e7\u00e3o ao vivo em ambientes paravirtualizados no modo PVH.\n<li class=\"l\"> Para o Dom0 no modo PVH, foi implementado suporte \u00e0 tecnologia Resizable BAR (Resizable Base Address Register), permitindo acesso imediato a toda a mem\u00f3ria do dispositivo PCI Express, e n\u00e3o apenas em rela\u00e7\u00e3o a blocos.\n<li class=\"l\"> Foi implementada a possibilidade de passar dispositivos PCI para ambientes domU no modo HVM (virtualiza\u00e7\u00e3o de hardware completa) em configura\u00e7\u00f5es onde o dom0 opera no modo PVH (uma combina\u00e7\u00e3o de virtualiza\u00e7\u00e3o de hardware e paravirtualiza\u00e7\u00e3o).  <\/ul>\n<li class=\"l\"> Mudan\u00e7as para sistemas baseados na arquitetura ARM:\n<ul>\n<li class=\"l\"> Foi adicionada a capacidade de ativar o mecanismo de prote\u00e7\u00e3o de pilha (compila\u00e7\u00e3o com a flag &#171;-fstack-protector&#187;), que se baseia na adi\u00e7\u00e3o de marcadores de can\u00e1rio na pilha \u2014 sequ\u00eancias aleat\u00f3rias. No caso de um estouro de buffer durante a explora\u00e7\u00e3o de uma vulnerabilidade, o marcador de can\u00e1rio \u00e9 sobrescrito por outros dados, o que acarreta na ativa\u00e7\u00e3o da verifica\u00e7\u00e3o subsequente da integridade do marcador e na inicia\u00e7\u00e3o de uma finaliza\u00e7\u00e3o de emerg\u00eancia do aplicativo.\n<li class=\"l\"> Suporte para o mecanismo eSPI (Extended Shared Peripheral Interrupts) foi adicionado, fornecido pelos controladores de interrup\u00e7\u00e3o GICv3.1.\n<li class=\"l\"> Implementado o tratamento de SMMU (System Memory Management Unit) ao passar dispositivos PCIe.\n<li class=\"l\"> Adicionado suporte para controladores de host PCI usados na quarta gera\u00e7\u00e3o de SoC Renesas R-Car.\n<li class=\"l\"> Suporte inicial para os processadores Cortex-R52 e Cortex-R82 com MPU (Memory Protection Unit) foi adicionado.    <\/ul>\n<li class=\"l\"> No port Xen para arquitetura RISC-V, foi implementado suporte b\u00e1sico para UART e a capacidade de tratamento de interrup\u00e7\u00f5es externas (APLIC\/IMSIC) no modo hipervisor.\n<li class=\"l\"> Continuada a implementa\u00e7\u00e3o das exig\u00eancias para o desenvolvimento de software seguro e confi\u00e1vel em language C, conforme estabelecido nas especifica\u00e7\u00f5es MISRA-C para sistemas cr\u00edticos.\n<li class=\"l\"> O suporte para vers\u00f5es antigas do GCC e Clang foi encerrado; agora, para constru\u00e7\u00e3o \u00e9 necess\u00e1rio pelo menos GCC 5.1, Clang 11, Binutils 2.25 e GNU Make 3.80.  <\/ul>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=64285\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u0441\u043b\u0435 8 \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 4.21. \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, EPAM Systems \u0438 AMD. \u041a\u043e\u0434 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u043d\u0430\u043f\u0438\u0441\u0430\u043d \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 \u0421\u0438 \u0438 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 GPLv2+. \u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0430 \u0432\u0435\u0434\u0451\u0442\u0441\u044f \u0432 \u0441\u043e\u0441\u0442\u0430\u0432\u0435 \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 Linux Foundation. \u041a\u043b\u044e\u0447\u0435\u0432\u044b\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0432 Xen 4.21: \u041e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0430 \u043f\u043e\u043b\u043d\u0430\u044f \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u043c\u043e\u0434\u0435\u043b\u0438 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432 Linux stubdomain, [&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-148860","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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