{"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\/ro\/blog\/news\/vypusk-gipervizora-xen-4-21","title":{"rendered":"Lansarea hypervisor-ului Xen 4.21","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Dup\u0103 8 luni de dezvoltare, a fost publicat release-ul hipervizorului liber Xen 4.21. La dezvoltarea noului release au participat companii precum Amazon, Arm, EPAM Systems \u0219i AMD. Codul proiectului este scris \u00een limbajul C \u0219i este distribuit sub licen\u021ba GPLv2+. Dezvoltarea se desf\u0103\u0219oar\u0103 \u00een cadrul organiza\u021biei Linux Foundation.      <\/p>\n<p>Schimb\u0103rile cheie \u00een Xen 4.21:   <\/p>\n<ul>\n<li class=\"l\"> A fost asigurat\u0103 suportul complet pentru modelul de dispozitive Linux stubdomain, care permite organizarea execu\u021biei componentelor pentru emularea dispozitivelor sub un utilizator neprivilegiat. Modelul Linux stubomains a fost dezvoltat de proiectul QUBES OS \u0219i suport\u0103 utilizarea driverelor de emulare din versiunile recente ale QEMU, precum \u0219i a func\u021bionalit\u0103\u021bilor asociate disponibile \u00een QEMU pentru sistemele guest.\n<li class=\"l\"> Modific\u0103ri pentru sistemele bazate pe arhitectura x86:\n<ul>\n<li class=\"l\"> A fost ad\u0103ugat suportul pentru noul algoritm de compresie al structurii PDX (Page inDeX), care \u00eembun\u0103t\u0103\u021be\u0219te performan\u021ba Xen pe procesoarele Intel Sierra Forest \u0219i Granite Rapids \u00een cazul map\u0103rilor non-liniare ale memoriei fizice (sparse memory map), care permit existen\u021ba unor zone goale.\n<li class=\"l\"> A fost ad\u0103ugat\u0103 posibilitatea de a controla atributul de cache \u00een MTRR (Memory Type Range Registers) pentru registrul BAR (Base Address Register) al dispozitivului PCI de baz\u0103 al platformei Xen, folosit de sistemele guest \u00een modul HVM. Implicit, \u00een MTRR pentru memoria reflecat\u0103 a dispozitivelor PCI, atributul este setat pe UC (uncacheable), care are sens pentru dispozitivele PCI reale, dar reduce performan\u021ba dispozitivelor PCI ale platformei Xen.\n<li class=\"l\"> Pentru procesoarele AMD a fost ad\u0103ugat un nou driver amd-cppc\/amd-cppc-epp, care gestioneaz\u0103 modificarea frecven\u021bei CPU pentru a ob\u021bine o performan\u021b\u0103 optim\u0103. \u00cen driver este folosit mecanismul CPPC (Collaborative Processor Performance Control), care, spre deosebire de acpi-cpufreq, nu este limitat la trei niveluri de performan\u021b\u0103 \u0219i permite o reac\u021bie mai rapid\u0103 la modific\u0103rile st\u0103rii.\n<li class=\"l\"> \u00cen varianta de interfa\u021b\u0103 xenstore-stubdom, utilizat\u0103 pentru a lansa xenstored f\u0103r\u0103 privilegii Dom0, pentru medii paravirtualizate \u00een modul PVH a fost implementat suportul pentru actualiz\u0103ri live.\n<li class=\"l\"> Pentru Dom0 \u00een modul PVH a fost implementat suportul pentru tehnologia Resizable BAR (Resizable Base Address Register), care permite accesul instantaneu la \u00eentreaga memorie a dispozitivului PCI Express, nu doar la blocuri.\n<li class=\"l\"> A fost implementat\u0103 posibilitatea de redirec\u021bionare a dispozitivelor PCI \u00een medii domU \u00een modul HVM (virtualizare hardware complet\u0103) \u00een configura\u021bii \u00een care dom0 func\u021bioneaz\u0103 \u00een modul PVH (virtualizare hibrid\u0103 hardware \u0219i paravirtualizare).  <\/ul>\n<li class=\"l\"> Modific\u0103ri pentru sistemele bazate pe arhitectura ARM:\n<ul>\n<li class=\"l\"> A fost ad\u0103ugat\u0103 posibilitatea activ\u0103rii mecanismului de protec\u021bie a stivei (compilare cu flama &#171;-fstack-protector&#187;), bazat pe ad\u0103ugarea de etichete de tip canar \u00een stiv\u0103 - secven\u021be aleatorii. \u00cen cazul unei dep\u0103\u0219iri a buffer-ului \u00een timpul exploat\u0103rii unei vulnerabilit\u0103\u021bi, eticheta canar este suprascris\u0103 de alte date, ceea ce duce la activarea verific\u0103rii ulterioare a integrit\u0103\u021bii etichetei \u0219i la ini\u021bierea \u00eenchiderii de urgen\u021b\u0103 a aplica\u021biei.\n<li class=\"l\"> A fost ad\u0103ugat suport pentru mecanismul eSPI (Extended Shared Peripheral Interrupts), furnizat de controlerele de \u00eentrerupere GICv3.1.\n<li class=\"l\"> A fost implementat\u0103 gestionarea SMMU (System Memory Management Unit) \u00een timpul redirec\u021bion\u0103rii dispozitivelor PCIe.\n<li class=\"l\"> A fost ad\u0103ugat suport pentru controlerele de gazd\u0103 PCI utilizate \u00een a patra genera\u021bie de SoC Renesas R-Car.\n<li class=\"l\"> A fost ad\u0103ugat suport ini\u021bial pentru procesoarele Cortex-R52 \u0219i Cortex-R82 cu MPU (Memory Protection Unit).    <\/ul>\n<li class=\"l\"> \u00cen portul Xen pentru arhitectura RISC-V a fost implementat un suport de baz\u0103 pentru UART \u0219i posibilitatea de a gestiona \u00eentreruperi externe (APLIC\/IMSIC) \u00een modul hypervizor.\n<li class=\"l\"> A fost continuat\u0103 implementarea cerin\u021belor pentru dezvoltarea programelor sigure \u0219i fiabile \u00een limbajul C, formulate \u00een specifica\u021biile MISRA-C pentru sisteme critice.\n<li class=\"l\"> A fost oprit suportul pentru versiunile vechi de GCC \u0219i Clang, acum fiind necesare versiuni minime de GCC 5.1, Clang 11, Binutils 2.25 \u0219i GNU Make 3.80 pentru compilare.  <\/ul>\n<p>Sursa: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=64285\">opennet.ro<\/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 5.0.2.1 - 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