{"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\/it\/blog\/novosti-interneta\/vypusk-emulyatora-qemu-4-2","title":{"rendered":"Rilascio dell'emulatore 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\">Presentato<\/a><\/noindex> rilascio del progetto <noindex><a rel=\"nofollow\" href=\"http:\/\/wiki.qemu.org\/Download\">QEMU 4.2<\/a><\/noindex>. Come emulatore, QEMU consente di eseguire un programma compilato per una piattaforma hardware su un sistema con un'architettura completamente diversa, ad esempio eseguire un'applicazione per ARM su un PC compatibile x86. In modalit\u00e0 di virtualizzazione, le prestazioni di esecuzione del codice in un ambiente isolato sono vicine a quelle di un sistema nativo grazie all'esecuzione diretta delle istruzioni sulla CPU e all'utilizzo dell'iper-visore Xen o del modulo KVM. <\/p>\n<p>Il progetto \u00e8 stato inizialmente creato da Fabrice Bellard con l'obiettivo di consentire l'esecuzione di file eseguibili Linux compilati per la piattaforma x86 su architetture diverse da x86. Nel corso degli anni sono state aggiunte funzionalit\u00e0 di emulazione completa per 14 architetture hardware, con il numero di dispositivi hardware emulati che ha superato 400. Per la versione 4.2 sono state apportate oltre 2200 modifiche da 198 sviluppatori. <\/p>\n<p>Chiave <noindex><a rel=\"nofollow\" href=\"http:\/\/wiki.qemu.org\/ChangeLog\/4.2\">miglioramenti<\/a><\/noindex>, aggiunti in QEMU 4.2:\n<\/p>\n<ul>\n<li class=\"l\"> Il generatore di codice TCG (Tiny Code Generator) ha implementato il supporto per plugin per il monitoraggio delle istruzioni del processore e degli indirizzi di memoria;\n<li class=\"l\">  Nel driver dei dispositivi a blocchi <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/qemu\/qemu\/blob\/master\/qemu-nbd.c\">NBD<\/a><\/noindex> (Network Block Device) \u00e8 stata garantita una gestione pi\u00f9 efficiente delle richieste di copie durante la lettura (copy-on-read). Il codice del server NBD \u00e8 stato ottimizzato per la copia di immagini sparse (con spazi vuoti). Sono stati apportati miglioramenti generali nell'implementazione del client e del server NBD;\n<li class=\"l\"> Migliorata la performance della crittografia dei dischi LUKS utilizzando l'algoritmo AES-XTS;\n<li class=\"l\"> In vfio-pci, support has been added for the property &#171;failover_pair_id&#187; to simplify the migration of VFIO devices;\n<li class=\"l\"> In virtio-mmio \u00e8 stato aggiunto il supporto per lo standard virtio-compatible 2 e per il meccanismo di code virtuali impacchettate definito nella specifica virtio 1.1 (<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>) per lo scambio di dati con un dispositivo virtuale di input\/output in modalit\u00e0 batch;\n<li class=\"l\"> In the x86 architecture emulator, a new type of emulated machine, &#171;microvm&#187;, has been added, using virtio-mmio instead of PCI to optimize performance. The ability to enable and disable VMX via flags &#171;-cpu&#187; has been implemented. Support for emulating AVX512 BFloat16 extensions has been added. Support for new CPU models Denverton (server SoC based on Atom), Snowridge, and Dhyana has been ensured. Support for the macOS Hypervisor Framework (&#171;-accel hvf&#187;) has been stabilized;\n<li class=\"l\"> In the ARM architecture emulator, support for emulating the Aspeed AST2600 SoC (&#171;ast2600-evb&#187;) has been added. Support for Semihosting 2.0 technology with STDOUT_STDERR\/EXIT_EXTENDED extensions has been added, allowing the emulated device to use stdout, stderr, and stdin to create files on the host side. KVM has added the ability to use more than 256 CPUs and has ensured support for SVE SIMD instructions. In virtual machines of type &#171;<noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/qemu\/qemu\/blob\/master\/hw\/arm\/virt.c\">virt<\/a><\/noindex>&#187;, hot-plugging memory support has been implemented. Emulation performance has been increased using the TCG code generator.\n<li class=\"l\"> In the PowerPC architecture emulator, support for emulating POWER9 instructions mffsce, mffscrn, and mffscrni has been introduced. Support for the Homer and OCC SRAM system devices has been added in the &#171;powernv&#187; emulated machines;\n<li class=\"l\"> In the RISC-V architecture emulator, the &#171;-initrd&#187; option has been added, and the ability to view the complete state of the architecture in the debugger has been implemented;\n<li class=\"l\"> Nell'emulatore dell'architettura s390 \u00e8 stato implementato il supporto per le istruzioni IEP (Instruction Execution Protection);\n<li class=\"l\"> Nell'emulatore dell'architettura 68k \u00e8 stata aggiunta la prima possibilit\u00e0 di emulare il Macintosh Quadro 800 e i sistemi classici NeXTcube;\n<li class=\"l\"> In the Xtensa architecture emulator, a new type of emulated machines &#171;virt&#187; has been introduced, and support for ABI call0 for user space emulation has been implemented.\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-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - 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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