{"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\/cs\/blog\/news\/vypusk-gipervizora-xen-4-21","title":{"rendered":"Vyd\u00e1n\u00ed hypervisoru Xen 4.21","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Po 8 m\u011bs\u00edc\u00edch v\u00fdvoje byl zve\u0159ejn\u011bn release svobodn\u00e9ho hypervizoru Xen 4.21. Na v\u00fdvoji nov\u00e9 verze se pod\u00edlely spole\u010dnosti jako Amazon, Arm, EPAM Systems a AMD. K\u00f3d projektu je naps\u00e1n v jazyce C a je distribuov\u00e1n pod licenc\u00ed GPLv2+. V\u00fdvoj prob\u00edh\u00e1 v r\u00e1mci organizace Linux Foundation.      <\/p>\n<p>Hlavn\u00ed zm\u011bny v Xen 4.21:   <\/p>\n<ul>\n<li class=\"l\"> Byla zaji\u0161t\u011bna pln\u00e1 podpora modelu za\u0159\u00edzen\u00ed Linux stubdomain, kter\u00fd umo\u017e\u0148uje organizovat prov\u00e1d\u011bn\u00ed komponent pro emulaci za\u0159\u00edzen\u00ed pod samostatn\u00fdm nep\u0159id\u011blen\u00fdm u\u017eivatelem. Model Linux stubomains byl navr\u017een projektem QUBES OS a podporuje pou\u017eit\u00ed emula\u010dn\u00edch ovlada\u010d\u016f z nov\u00fdch verz\u00ed QEMU a tak\u00e9 dostupn\u00fdch v QEMU souvisej\u00edc\u00edch mo\u017enost\u00ed pro hostitelsk\u00e9 syst\u00e9my.\n<li class=\"l\"> Zm\u011bny pro syst\u00e9my zalo\u017een\u00e9 na architektu\u0159e x86:\n<ul>\n<li class=\"l\"> Byla p\u0159id\u00e1na podpora nov\u00e9ho algoritmu komprese struktury PDX (Page inDeX), kter\u00fd zlep\u0161uje v\u00fdkon Xen na procesorech Intel Sierra Forest a Granite Rapids p\u0159i neline\u00e1rn\u00edm mapov\u00e1n\u00ed fyzick\u00e9 pam\u011bti (sparse memory map), kter\u00e9 umo\u017e\u0148uje existenci pr\u00e1zdn\u00fdch oblast\u00ed.\n<li class=\"l\"> Byla p\u0159id\u00e1na mo\u017enost \u0159\u00eddit atribut ke\u0161ov\u00e1n\u00ed v MTRR (Memory Type Range Registers) pro registr BAR (Base Address Register) z\u00e1kladn\u00edho PCI za\u0159\u00edzen\u00ed platformy Xen, pou\u017e\u00edvan\u00e9ho hostitelsk\u00fdmi syst\u00e9my v re\u017eimu HVM. Ve v\u00fdchoz\u00edm nastaven\u00ed je v MTRR pro zrcadlenou pam\u011b\u0165 PCI za\u0159\u00edzen\u00ed nastavena vlastnost UC (uncacheable), kter\u00e1 m\u00e1 smysl pro skute\u010dn\u00e1 PCI za\u0159\u00edzen\u00ed, ale pouze sni\u017euje v\u00fdkon PCI za\u0159\u00edzen\u00ed platformy Xen.\n<li class=\"l\"> Pro procesory AMD byl p\u0159id\u00e1n nov\u00fd ovlada\u010d amd-cppc\/amd-cppc-epp, kter\u00fd \u0159\u00edd\u00ed zm\u011bnu frekvence CPU pro dosa\u017een\u00ed optim\u00e1ln\u00edho v\u00fdkonu. V ovlada\u010di je vyu\u017eit mechanismus CPPC (Collaborative Processor Performance Control), kter\u00fd na rozd\u00edl od acpi-cpufreq nen\u00ed omezen na t\u0159i \u00farovn\u011b v\u00fdkonu a umo\u017e\u0148uje rychleji reagovat na zm\u011bnu stavu.\n<li class=\"l\"> V variant\u011b vrstvy xenstore-stubdom, pou\u017e\u00edvan\u00e9 k spu\u0161t\u011bn\u00ed xenstored bez privilegii Dom0, byla pro paravirtualizovan\u00e1 prost\u0159ed\u00ed v re\u017eimu PVH implementov\u00e1na podpora live-updatu.\n<li class=\"l\"> Pro Dom0 v re\u017eimu PVH byla implementov\u00e1na podpora technologie Resizable BAR (Resizable Base Address Register), kter\u00e1 umo\u017e\u0148uje okam\u017eit\u00fd p\u0159\u00edstup k cel\u00e9 pam\u011bti za\u0159\u00edzen\u00ed PCI Express, a nikoli pouze se vztahem k blok\u016fm.\n<li class=\"l\"> Byla realizov\u00e1na mo\u017enost p\u0159ed\u00e1v\u00e1n\u00ed PCI za\u0159\u00edzen\u00ed do prost\u0159ed\u00ed domU v re\u017eimu HVM (\u00fapln\u00e1 hardwarov\u00e1 virtualizace) v konfigurac\u00edch, kde dom0 pracuje v re\u017eimu PVH (hybridn\u00ed hardwarov\u00e1 virtualizace a paravirtualizace).  <\/ul>\n<li class=\"l\"> Zm\u011bny pro syst\u00e9my zalo\u017een\u00e9 na architektu\u0159e ARM:\n<ul>\n<li class=\"l\"> Byla p\u0159id\u00e1na mo\u017enost aktivace mechanismu ochrany z\u00e1sobn\u00edku (kompilace s volbou &#171;-fstack-protector&#187;), kter\u00fd spo\u010d\u00edv\u00e1 v p\u0159id\u00e1n\u00ed kan\u00e1rkov\u00fdch zna\u010dek do z\u00e1sobn\u00edku \u2014 n\u00e1hodn\u00fdch sekvenc\u00ed. V p\u0159\u00edpad\u011b p\u0159ete\u010den\u00ed z\u00e1sobn\u00edku b\u011bhem exploatace zranitelnosti dojde k p\u0159eps\u00e1n\u00ed kan\u00e1rkov\u00e9 zna\u010dky jin\u00fdmi daty, co\u017e vyvol\u00e1 n\u00e1slednou kontrolu integrity zna\u010dky a zp\u016fsob\u00ed nouzov\u00e9 ukon\u010den\u00ed aplikace.\n<li class=\"l\"> Byla p\u0159id\u00e1na podpora mechanismu eSPI (Extended Shared Peripheral Interrupts), poskytovan\u00e9ho \u0159adi\u010di p\u0159eru\u0161en\u00ed GICv3.1.\n<li class=\"l\"> Byla realizov\u00e1na zpracov\u00e1n\u00ed SMMU (System Memory Management Unit) p\u0159i p\u0159ed\u00e1v\u00e1n\u00ed za\u0159\u00edzen\u00ed PCIe.\n<li class=\"l\"> Byla p\u0159id\u00e1na podpora hostitelsk\u00fdch \u0159adi\u010d\u016f PCI, pou\u017e\u00edvan\u00fdch ve \u010dtvrt\u00e9 generaci SoC Renesas R-Car.\n<li class=\"l\"> Byla p\u0159id\u00e1na po\u010d\u00e1te\u010dn\u00ed podpora procesor\u016f Cortex-R52 a Cortex-R82 s MPU (Memory Protection Unit).    <\/ul>\n<li class=\"l\"> V portu Xen pro architekturu RISC-V byla realizov\u00e1na z\u00e1kladn\u00ed podpora UART a mo\u017enost zpracov\u00e1n\u00ed extern\u00edch p\u0159eru\u0161en\u00ed (APLIC\/IMSIC) v re\u017eimu hypervizora.\n<li class=\"l\"> Byla pokra\u010dov\u00e1na realizace po\u017eadavk\u016f na v\u00fdvoj bezpe\u010dn\u00fdch a spolehliv\u00fdch aplikac\u00ed v jazyce C, formulovan\u00fdch ve specifikac\u00edch MISRA-C pro kritick\u00e9 syst\u00e9my.\n<li class=\"l\"> Byla ukon\u010dena podpora star\u00fdch verz\u00ed GCC a Clang, pro kompilaci jsou nyn\u00ed vy\u017eadov\u00e1ny alespo\u0148 verze GCC 5.1, Clang 11, Binutils 2.25 a GNU Make 3.80.  <\/ul>\n<p>Zdroj: <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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