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qemu-doc: replace introduction with the one from the internals manual

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The user manual has an obsolete introduction, and the one in
the internals manual lists QEMU's features quite nicely.
Drop the obsolete content and remove generic user-level
documentation from qemu-tech.

Reviewed-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-10-06 14:59:26 +02:00
parent f91c7e5235
commit 1f3e7e41bb
2 changed files with 44 additions and 128 deletions
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88
qemu-tech.texi
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@ -41,7 +41,6 @@
@chapter Introduction
@menu
* intro_features:: Features
* intro_x86_emulation:: x86 and x86-64 emulation
* intro_arm_emulation:: ARM emulation
* intro_mips_emulation:: MIPS emulation
@ -51,93 +50,6 @@
* intro_other_emulation:: Other CPU emulation
@end menu
@node intro_features
@section Features
QEMU is a FAST! processor emulator using a portable dynamic
translator.
QEMU has two operating modes:
@itemize @minus
@item
Full system emulation. In this mode (full platform virtualization),
QEMU emulates a full system (usually a PC), including a processor and
various peripherals. It can be used to launch several different
Operating Systems at once without rebooting the host machine or to
debug system code.
@item
User mode emulation. In this mode (application level virtualization),
QEMU can launch processes compiled for one CPU on another CPU, however
the Operating Systems must match. This can be used for example to ease
cross-compilation and cross-debugging.
@end itemize
As QEMU requires no host kernel driver to run, it is very safe and
easy to use.
QEMU generic features:
@itemize
@item User space only or full system emulation.
@item Using dynamic translation to native code for reasonable speed.
@item
Working on x86, x86_64 and PowerPC32/64 hosts. Being tested on ARM,
S390x, Sparc32 and Sparc64.
@item Self-modifying code support.
@item Precise exceptions support.
@item
Floating point library supporting both full software emulation and
native host FPU instructions.
@end itemize
QEMU user mode emulation features:
@itemize
@item Generic Linux system call converter, including most ioctls.
@item clone() emulation using native CPU clone() to use Linux scheduler for threads.
@item Accurate signal handling by remapping host signals to target signals.
@end itemize
Linux user emulator (Linux host only) can be used to launch the Wine
Windows API emulator (@url{http://www.winehq.org}). A BSD user emulator for BSD
hosts is under development. It would also be possible to develop a
similar user emulator for Solaris.
QEMU full system emulation features:
@itemize
@item
QEMU uses a full software MMU for maximum portability.
@item
QEMU can optionally use an in-kernel accelerator, like kvm. The accelerators
execute some of the guest code natively, while
continuing to emulate the rest of the machine.
@item
Various hardware devices can be emulated and in some cases, host
devices (e.g. serial and parallel ports, USB, drives) can be used
transparently by the guest Operating System. Host device passthrough
can be used for talking to external physical peripherals (e.g. a
webcam, modem or tape drive).
@item
Symmetric multiprocessing (SMP) even on a host with a single CPU. On a
SMP host system, QEMU can use only one CPU fully due to difficulty in
implementing atomic memory accesses efficiently.
@end itemize
@node intro_x86_emulation
@section x86 and x86-64 emulation