X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=qemu-tech.texi;h=0380de77b627d701bf87a1e7365d225acf0dba0a;hb=644acf99b8cb8437f65600cf00c2e090bf3e3bc2;hp=5676fb7afd5c5d03700575c466a47b614483c6e1;hpb=d06cddf517d2b33389c02971b353d10dd4edda1a;p=mirror_qemu.git diff --git a/qemu-tech.texi b/qemu-tech.texi index 5676fb7afd..0380de77b6 100644 --- a/qemu-tech.texi +++ b/qemu-tech.texi @@ -1,148 +1,25 @@ -\input texinfo @c -*- texinfo -*- -@c %**start of header -@setfilename qemu-tech.info - -@documentlanguage en -@documentencoding UTF-8 - -@settitle QEMU Internals -@exampleindent 0 -@paragraphindent 0 -@c %**end of header - -@ifinfo -@direntry -* QEMU Internals: (qemu-tech). The QEMU Emulator Internals. -@end direntry -@end ifinfo - -@iftex -@titlepage -@sp 7 -@center @titlefont{QEMU Internals} -@sp 3 -@end titlepage -@end iftex - -@ifnottex -@node Top -@top +@node Implementation notes +@appendix Implementation notes @menu -* Introduction:: -* QEMU Internals:: -* Regression Tests:: -* Index:: +* CPU emulation:: +* Managed start up options:: @end menu -@end ifnottex -@contents - -@node Introduction -@chapter Introduction +@node CPU emulation +@section CPU emulation @menu -* intro_features:: Features -* intro_x86_emulation:: x86 and x86-64 emulation -* intro_arm_emulation:: ARM emulation -* intro_mips_emulation:: MIPS emulation -* intro_ppc_emulation:: PowerPC emulation -* intro_sparc_emulation:: Sparc32 and Sparc64 emulation -* intro_xtensa_emulation:: Xtensa emulation -* intro_other_emulation:: Other CPU emulation +* x86:: x86 and x86-64 emulation +* ARM:: ARM emulation +* MIPS:: MIPS emulation +* PPC:: PowerPC emulation +* SPARC:: Sparc32 and Sparc64 emulation +* Xtensa:: Xtensa 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, -HPPA, Sparc32 and Sparc64. Previous versions had some support for -Alpha and S390 hosts, but TCG (see below) doesn't support those yet. - -@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 Darwin user -emulator (Darwin hosts only) exists and 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 +@node x86 +@subsection x86 and x86-64 emulation QEMU x86 target features: @@ -176,8 +53,8 @@ normal use. @end itemize -@node intro_arm_emulation -@section ARM emulation +@node ARM +@subsection ARM emulation @itemize @@ -189,8 +66,8 @@ normal use. @end itemize -@node intro_mips_emulation -@section MIPS emulation +@node MIPS +@subsection MIPS emulation @itemize @@ -216,8 +93,8 @@ Current QEMU limitations: @end itemize -@node intro_ppc_emulation -@section PowerPC emulation +@node PPC +@subsection PowerPC emulation @itemize @@ -228,8 +105,8 @@ FPU and MMU. @end itemize -@node intro_sparc_emulation -@section Sparc32 and Sparc64 emulation +@node SPARC +@subsection Sparc32 and Sparc64 emulation @itemize @@ -256,23 +133,23 @@ Current QEMU limitations: @end itemize -@node intro_xtensa_emulation -@section Xtensa emulation +@node Xtensa +@subsection Xtensa emulation @itemize @item Core Xtensa ISA emulation, including most options: code density, loop, extended L32R, 16- and 32-bit multiplication, 32-bit division, -MAC16, miscellaneous operations, boolean, multiprocessor synchronization, +MAC16, miscellaneous operations, boolean, FP coprocessor, coprocessor +context, debug, multiprocessor synchronization, conditional store, exceptions, relocatable vectors, unaligned exception, interrupts (including high priority and timer), hardware alignment, region protection, region translation, MMU, windowed registers, thread pointer, processor ID. -@item Not implemented options: FP coprocessor, coprocessor context, -data/instruction cache (including cache prefetch and locking), XLMI, -processor interface, debug. Also options not covered by the core ISA -(e.g. FLIX, wide branches) are not implemented. +@item Not implemented options: data/instruction cache (including cache +prefetch and locking), XLMI, processor interface. Also options not +covered by the core ISA (e.g. FLIX, wide branches) are not implemented. @item Can run most Xtensa Linux binaries. @@ -281,433 +158,38 @@ may be created from overlay with minimal amount of hand-written code. @end itemize -@node intro_other_emulation -@section Other CPU emulation - -In addition to the above, QEMU supports emulation of other CPUs with -varying levels of success. These are: - -@itemize - -@item -Alpha -@item -CRIS -@item -M68k -@item -SH4 -@end itemize - -@node QEMU Internals -@chapter QEMU Internals - -@menu -* QEMU compared to other emulators:: -* Portable dynamic translation:: -* Condition code optimisations:: -* CPU state optimisations:: -* Translation cache:: -* Direct block chaining:: -* Self-modifying code and translated code invalidation:: -* Exception support:: -* MMU emulation:: -* Device emulation:: -* Hardware interrupts:: -* User emulation specific details:: -* Bibliography:: -@end menu - -@node QEMU compared to other emulators -@section QEMU compared to other emulators - -Like bochs [3], QEMU emulates an x86 CPU. But QEMU is much faster than -bochs as it uses dynamic compilation. Bochs is closely tied to x86 PC -emulation while QEMU can emulate several processors. - -Like Valgrind [2], QEMU does user space emulation and dynamic -translation. Valgrind is mainly a memory debugger while QEMU has no -support for it (QEMU could be used to detect out of bound memory -accesses as Valgrind, but it has no support to track uninitialised data -as Valgrind does). The Valgrind dynamic translator generates better code -than QEMU (in particular it does register allocation) but it is closely -tied to an x86 host and target and has no support for precise exceptions -and system emulation. - -EM86 [4] is the closest project to user space QEMU (and QEMU still uses -some of its code, in particular the ELF file loader). EM86 was limited -to an alpha host and used a proprietary and slow interpreter (the -interpreter part of the FX!32 Digital Win32 code translator [5]). - -TWIN [6] is a Windows API emulator like Wine. It is less accurate than -Wine but includes a protected mode x86 interpreter to launch x86 Windows -executables. Such an approach has greater potential because most of the -Windows API is executed natively but it is far more difficult to develop -because all the data structures and function parameters exchanged -between the API and the x86 code must be converted. - -User mode Linux [7] was the only solution before QEMU to launch a -Linux kernel as a process while not needing any host kernel -patches. However, user mode Linux requires heavy kernel patches while -QEMU accepts unpatched Linux kernels. The price to pay is that QEMU is -slower. - -The Plex86 [8] PC virtualizer is done in the same spirit as the now -obsolete qemu-fast system emulator. It requires a patched Linux kernel -to work (you cannot launch the same kernel on your PC), but the -patches are really small. As it is a PC virtualizer (no emulation is -done except for some privileged instructions), it has the potential of -being faster than QEMU. The downside is that a complicated (and -potentially unsafe) host kernel patch is needed. - -The commercial PC Virtualizers (VMWare [9], VirtualPC [10], TwoOStwo -[11]) are faster than QEMU, but they all need specific, proprietary -and potentially unsafe host drivers. Moreover, they are unable to -provide cycle exact simulation as an emulator can. - -VirtualBox [12], Xen [13] and KVM [14] are based on QEMU. QEMU-SystemC -[15] uses QEMU to simulate a system where some hardware devices are -developed in SystemC. - -@node Portable dynamic translation -@section Portable dynamic translation - -QEMU is a dynamic translator. When it first encounters a piece of code, -it converts it to the host instruction set. Usually dynamic translators -are very complicated and highly CPU dependent. QEMU uses some tricks -which make it relatively easily portable and simple while achieving good -performances. - -After the release of version 0.9.1, QEMU switched to a new method of -generating code, Tiny Code Generator or TCG. TCG relaxes the -dependency on the exact version of the compiler used. The basic idea -is to split every target instruction into a couple of RISC-like TCG -ops (see @code{target-i386/translate.c}). Some optimizations can be -performed at this stage, including liveness analysis and trivial -constant expression evaluation. TCG ops are then implemented in the -host CPU back end, also known as TCG target (see -@code{tcg/i386/tcg-target.c}). For more information, please take a -look at @code{tcg/README}. - -@node Condition code optimisations -@section Condition code optimisations - -Lazy evaluation of CPU condition codes (@code{EFLAGS} register on x86) -is important for CPUs where every instruction sets the condition -codes. It tends to be less important on conventional RISC systems -where condition codes are only updated when explicitly requested. On -Sparc64, costly update of both 32 and 64 bit condition codes can be -avoided with lazy evaluation. - -Instead of computing the condition codes after each x86 instruction, -QEMU just stores one operand (called @code{CC_SRC}), the result -(called @code{CC_DST}) and the type of operation (called -@code{CC_OP}). When the condition codes are needed, the condition -codes can be calculated using this information. In addition, an -optimized calculation can be performed for some instruction types like -conditional branches. - -@code{CC_OP} is almost never explicitly set in the generated code -because it is known at translation time. - -The lazy condition code evaluation is used on x86, m68k, cris and -Sparc. ARM uses a simplified variant for the N and Z flags. - -@node CPU state optimisations -@section CPU state optimisations - -The target CPUs have many internal states which change the way it -evaluates instructions. In order to achieve a good speed, the -translation phase considers that some state information of the virtual -CPU cannot change in it. The state is recorded in the Translation -Block (TB). If the state changes (e.g. privilege level), a new TB will -be generated and the previous TB won't be used anymore until the state -matches the state recorded in the previous TB. For example, if the SS, -DS and ES segments have a zero base, then the translator does not even -generate an addition for the segment base. - -[The FPU stack pointer register is not handled that way yet]. - -@node Translation cache -@section Translation cache - -A 32 MByte cache holds the most recently used translations. For -simplicity, it is completely flushed when it is full. A translation unit -contains just a single basic block (a block of x86 instructions -terminated by a jump or by a virtual CPU state change which the -translator cannot deduce statically). - -@node Direct block chaining -@section Direct block chaining - -After each translated basic block is executed, QEMU uses the simulated -Program Counter (PC) and other cpu state informations (such as the CS -segment base value) to find the next basic block. - -In order to accelerate the most common cases where the new simulated PC -is known, QEMU can patch a basic block so that it jumps directly to the -next one. - -The most portable code uses an indirect jump. An indirect jump makes -it easier to make the jump target modification atomic. On some host -architectures (such as x86 or PowerPC), the @code{JUMP} opcode is -directly patched so that the block chaining has no overhead. - -@node Self-modifying code and translated code invalidation -@section Self-modifying code and translated code invalidation - -Self-modifying code is a special challenge in x86 emulation because no -instruction cache invalidation is signaled by the application when code -is modified. - -When translated code is generated for a basic block, the corresponding -host page is write protected if it is not already read-only. Then, if -a write access is done to the page, Linux raises a SEGV signal. QEMU -then invalidates all the translated code in the page and enables write -accesses to the page. - -Correct translated code invalidation is done efficiently by maintaining -a linked list of every translated block contained in a given page. Other -linked lists are also maintained to undo direct block chaining. - -On RISC targets, correctly written software uses memory barriers and -cache flushes, so some of the protection above would not be -necessary. However, QEMU still requires that the generated code always -matches the target instructions in memory in order to handle -exceptions correctly. - -@node Exception support -@section Exception support - -longjmp() is used when an exception such as division by zero is -encountered. - -The host SIGSEGV and SIGBUS signal handlers are used to get invalid -memory accesses. The simulated program counter is found by -retranslating the corresponding basic block and by looking where the -host program counter was at the exception point. - -The virtual CPU cannot retrieve the exact @code{EFLAGS} register because -in some cases it is not computed because of condition code -optimisations. It is not a big concern because the emulated code can -still be restarted in any cases. - -@node MMU emulation -@section MMU emulation - -For system emulation QEMU supports a soft MMU. In that mode, the MMU -virtual to physical address translation is done at every memory -access. QEMU uses an address translation cache to speed up the -translation. - -In order to avoid flushing the translated code each time the MMU -mappings change, QEMU uses a physically indexed translation cache. It -means that each basic block is indexed with its physical address. - -When MMU mappings change, only the chaining of the basic blocks is -reset (i.e. a basic block can no longer jump directly to another one). - -@node Device emulation -@section Device emulation - -Systems emulated by QEMU are organized by boards. At initialization -phase, each board instantiates a number of CPUs, devices, RAM and -ROM. Each device in turn can assign I/O ports or memory areas (for -MMIO) to its handlers. When the emulation starts, an access to the -ports or MMIO memory areas assigned to the device causes the -corresponding handler to be called. - -RAM and ROM are handled more optimally, only the offset to the host -memory needs to be added to the guest address. - -The video RAM of VGA and other display cards is special: it can be -read or written directly like RAM, but write accesses cause the memory -to be marked with VGA_DIRTY flag as well. - -QEMU supports some device classes like serial and parallel ports, USB, -drives and network devices, by providing APIs for easier connection to -the generic, higher level implementations. The API hides the -implementation details from the devices, like native device use or -advanced block device formats like QCOW. - -Usually the devices implement a reset method and register support for -saving and loading of the device state. The devices can also use -timers, especially together with the use of bottom halves (BHs). - -@node Hardware interrupts -@section Hardware interrupts - -In order to be faster, QEMU does not check at every basic block if an -hardware interrupt is pending. Instead, the user must asynchronously -call a specific function to tell that an interrupt is pending. This -function resets the chaining of the currently executing basic -block. It ensures that the execution will return soon in the main loop -of the CPU emulator. Then the main loop can test if the interrupt is -pending and handle it. - -@node User emulation specific details -@section User emulation specific details - -@subsection Linux system call translation - -QEMU includes a generic system call translator for Linux. It means that -the parameters of the system calls can be converted to fix the -endianness and 32/64 bit issues. The IOCTLs are converted with a generic -type description system (see @file{ioctls.h} and @file{thunk.c}). - -QEMU supports host CPUs which have pages bigger than 4KB. It records all -the mappings the process does and try to emulated the @code{mmap()} -system calls in cases where the host @code{mmap()} call would fail -because of bad page alignment. - -@subsection Linux signals - -Normal and real-time signals are queued along with their information -(@code{siginfo_t}) as it is done in the Linux kernel. Then an interrupt -request is done to the virtual CPU. When it is interrupted, one queued -signal is handled by generating a stack frame in the virtual CPU as the -Linux kernel does. The @code{sigreturn()} system call is emulated to return -from the virtual signal handler. - -Some signals (such as SIGALRM) directly come from the host. Other -signals are synthesized from the virtual CPU exceptions such as SIGFPE -when a division by zero is done (see @code{main.c:cpu_loop()}). - -The blocked signal mask is still handled by the host Linux kernel so -that most signal system calls can be redirected directly to the host -Linux kernel. Only the @code{sigaction()} and @code{sigreturn()} system -calls need to be fully emulated (see @file{signal.c}). - -@subsection clone() system call and threads - -The Linux clone() system call is usually used to create a thread. QEMU -uses the host clone() system call so that real host threads are created -for each emulated thread. One virtual CPU instance is created for each -thread. - -The virtual x86 CPU atomic operations are emulated with a global lock so -that their semantic is preserved. - -Note that currently there are still some locking issues in QEMU. In -particular, the translated cache flush is not protected yet against -reentrancy. - -@subsection Self-virtualization - -QEMU was conceived so that ultimately it can emulate itself. Although -it is not very useful, it is an important test to show the power of the -emulator. - -Achieving self-virtualization is not easy because there may be address -space conflicts. QEMU user emulators solve this problem by being an -executable ELF shared object as the ld-linux.so ELF interpreter. That -way, it can be relocated at load time. - -@node Bibliography -@section Bibliography +@node Managed start up options +@section Managed start up options +In system mode emulation, it's possible to create a VM in a paused state using +the -S command line option. In this state the machine is completely initialized +according to command line options and ready to execute VM code but VCPU threads +are not executing any code. The VM state in this paused state depends on the way +QEMU was started. It could be in: @table @asis - -@item [1] -@url{http://citeseer.nj.nec.com/piumarta98optimizing.html}, Optimizing -direct threaded code by selective inlining (1998) by Ian Piumarta, Fabio -Riccardi. - -@item [2] -@url{http://developer.kde.org/~sewardj/}, Valgrind, an open-source -memory debugger for x86-GNU/Linux, by Julian Seward. - -@item [3] -@url{http://bochs.sourceforge.net/}, the Bochs IA-32 Emulator Project, -by Kevin Lawton et al. - -@item [4] -@url{http://www.cs.rose-hulman.edu/~donaldlf/em86/index.html}, the EM86 -x86 emulator on Alpha-Linux. - -@item [5] -@url{http://www.usenix.org/publications/library/proceedings/usenix-nt97/@/full_papers/chernoff/chernoff.pdf}, -DIGITAL FX!32: Running 32-Bit x86 Applications on Alpha NT, by Anton -Chernoff and Ray Hookway. - -@item [6] -@url{http://www.willows.com/}, Windows API library emulation from -Willows Software. - -@item [7] -@url{http://user-mode-linux.sourceforge.net/}, -The User-mode Linux Kernel. - -@item [8] -@url{http://www.plex86.org/}, -The new Plex86 project. - -@item [9] -@url{http://www.vmware.com/}, -The VMWare PC virtualizer. - -@item [10] -@url{http://www.microsoft.com/windowsxp/virtualpc/}, -The VirtualPC PC virtualizer. - -@item [11] -@url{http://www.twoostwo.org/}, -The TwoOStwo PC virtualizer. - -@item [12] -@url{http://virtualbox.org/}, -The VirtualBox PC virtualizer. - -@item [13] -@url{http://www.xen.org/}, -The Xen hypervisor. - -@item [14] -@url{http://kvm.qumranet.com/kvmwiki/Front_Page}, -Kernel Based Virtual Machine (KVM). - -@item [15] -@url{http://www.greensocs.com/projects/QEMUSystemC}, -QEMU-SystemC, a hardware co-simulator. - +@item initial state (after reset/power on state) +@item with direct kernel loading, the initial state could be amended to execute +code loaded by QEMU in the VM's RAM and with incoming migration +@item with incoming migration, initial state will by amended with the migrated +machine state after migration completes. @end table -@node Regression Tests -@chapter Regression Tests - -In the directory @file{tests/}, various interesting testing programs -are available. They are used for regression testing. - -@menu -* test-i386:: -* linux-test:: -@end menu - -@node test-i386 -@section @file{test-i386} - -This program executes most of the 16 bit and 32 bit x86 instructions and -generates a text output. It can be compared with the output obtained with -a real CPU or another emulator. The target @code{make test} runs this -program and a @code{diff} on the generated output. - -The Linux system call @code{modify_ldt()} is used to create x86 selectors -to test some 16 bit addressing and 32 bit with segmentation cases. - -The Linux system call @code{vm86()} is used to test vm86 emulation. - -Various exceptions are raised to test most of the x86 user space -exception reporting. - -@node linux-test -@section @file{linux-test} - -This program tests various Linux system calls. It is used to verify -that the system call parameters are correctly converted between target -and host CPUs. - -@node Index -@chapter Index -@printindex cp - -@bye +This paused state is typically used by users to query machine state and/or +additionally configure the machine (by hotplugging devices) in runtime before +allowing VM code to run. + +However, at the -S pause point, it's impossible to configure options that affect +initial VM creation (like: -smp/-m/-numa ...) or cold plug devices. The +experimental --preconfig command line option allows pausing QEMU +before the initial VM creation, in a ``preconfig'' state, where additional +queries and configuration can be performed via QMP before moving on to +the resulting configuration startup. In the preconfig state, QEMU only allows +a limited set of commands over the QMP monitor, where the commands do not +depend on an initialized machine, including but not limited to: +@table @asis +@item qmp_capabilities +@item query-qmp-schema +@item query-commands +@item query-status +@item x-exit-preconfig +@end table