aliguori [Mon, 13 Oct 2008 03:12:02 +0000 (03:12 +0000)]
Introduce UI for live migration
This patch introduces a command line parameter and monitor command for starting
a live migration. The next patch will provide an example of how to use these
parameters.
aliguori [Mon, 13 Oct 2008 03:10:22 +0000 (03:10 +0000)]
Introduce a buffered file wrapper for QEMUFile
This patch introduces a buffered QEMUFile wrapper. This allows QEMUFile's to be
rate limited. It also makes it easier to implement a QEMUFile that is
asynchronous since the current QEMUFile API requires that all reads and writes
be synchronous.
The only real non-obvious part of the API is the "frozen" concept. If the
backend returns EAGAIN, the QEMUFile is said to be "frozen". This means no
additional output will be sent to the backend until the file is unfrozen.
qemu_file_put_notify can be used to unfreeze a frozen file.
A synchronous interface is also provided to wait for an unfreeze event. This is
used during the final part of live migration when the VM is no longer running.
aliguori [Mon, 13 Oct 2008 03:07:56 +0000 (03:07 +0000)]
Fix some issues with QEMUFile
This patch allows QEMUFile's read and write operations to return
negative error codes. This is necessary to detect things like closed
streams during live migration.
It also removes unused code for QEMUFileFD write path. Finally, it
makes sure to avoid attempting to flush an output buffer if the file
is only being used for input. This was spotted by Uri Lublin.
aurel32 [Sun, 12 Oct 2008 23:32:40 +0000 (23:32 +0000)]
SH4: Fix swap.b
The SH4 manual documents the swap.b instruction as follows:
SWAP.B Rm,Rn
Rm → swap lower 2 bytes → Rn
Current QEMU code, in addition to the above, also clears the high
16 bits. The immediate breakage I saw is that htonl function applied
to netmask of 255.255.255.0 gives 0, which breaks all networking.
balrog [Sat, 11 Oct 2008 09:19:57 +0000 (09:19 +0000)]
Increase write buffer size in pflash emulation (Thomas Petazzoni).
The current flash emulation code advertises a write buffer size of 16
bytes (1 << 4, according to offset 0x2A of the CFI table). This is
very small compared to normal write buffer sizes, and makes the
process of writing to the flash very slow (at least from U-Boot).
This patch increases this size to 2048 bytes. Except the modification
of the CFI table, the only other required modification is to use
"value" instead of "cmd" to set pfl->counter, because cmd is truncated
to the 8 lower bits of value, while the number of bytes for a write
can now be greater than 255 bytes.
aliguori [Wed, 8 Oct 2008 19:50:24 +0000 (19:50 +0000)]
Fix IO performance regression in sparc
Replace signalfd with signal handler/pipe. There is no way to interrupt
the CPU execution loop when a file descriptor becomes readable. This
results in a large performance regression in sparc emulation during
bootup.
This patch switches us to signal handler/pipe which was originally
suggested by Ian Jackson. The signal handler lets us interrupt the
CPU emulation loop while the write to a pipe lets us avoid the
select/signal race condition.
aliguori [Tue, 7 Oct 2008 20:39:39 +0000 (20:39 +0000)]
machine struct - specify max_cpus at the per machine level (Jes Sorensen)
Introduce a max_cpus per-machine variable, allowing individual boards
to limit it's number of CPUs. Check requested number of CPUs in setup
code and exit if it exceeds the supported number for the machine.
This also renders the static MAX_CPUS check obsolete, so remove this
from vl.c.
aliguori [Tue, 7 Oct 2008 19:16:17 +0000 (19:16 +0000)]
Add sparse checker support to the build system (Gerd Hoffman)
This adds support for running the sparse checker during the build
process. Left it off by default for now, build becomes very noisy with
sparse checking turned on as it has to complain alot (partly even in the
system headers!). The qemu code base needs quite some cleanups before
we should consider turning it on by default.
aliguori [Mon, 6 Oct 2008 20:21:51 +0000 (20:21 +0000)]
Switch the memory savevm handler to be "live"
This patch replaces the static memory savevm/loadvm handler with a "live" one.
This handler is used even if performing a non-live migration.
The key difference between this handler and the previous is that each page is
prefixed with the address of the page. The QEMUFile rate limiting code, in
combination with the live migration dirty tracking bits, is used to determine
which pages should be sent and how many should be sent.
The live save code "converges" when the number of dirty pages reaches a fixed
amount. Currently, this is 10 pages. This is something that should eventually
be derived from whatever the bandwidth limitation is.
aliguori [Mon, 6 Oct 2008 14:53:52 +0000 (14:53 +0000)]
Introduce v3 of savevm protocol
The current savevm/loadvm protocol has some draw backs. It does not support
the ability to do progressive saving which means it cannot be used for live
checkpointing or migration. The sections sizes are 32-bit integers which
means that it will not function when using more than 4GB of memory for a guest.
It attempts to seek within the output file which means it cannot be streamed.
The current protocol also is pretty lax about how it supports forward
compatibility. If a saved section version is greater than what the restore
code support, the restore code generally treats the saved data as being in
whatever version it supports. This means that restoring a saved VM on an older
version of QEMU will likely result in silent guest failure.
This patch introduces a new version of the savevm protocol. It has the
following features:
* Support for progressive save of sections (for live checkpoint/migration)
* An asynchronous API for doing save
* Support for interleaving multiple progressive save sections
(for future support of memory hot-add/storage migration)
* Fully streaming format
* Strong section version checking
aliguori [Mon, 6 Oct 2008 13:55:43 +0000 (13:55 +0000)]
Add bdrv_flush_all()
This patch adds a bdrv_flush_all() function. It's necessary to ensure that all
IO operations have been flushed to disk before completely a live migration.
N.B. we don't actually use this now. We really should flush the block drivers
using an live savevm callback to avoid unnecessary guest down time.
aliguori [Mon, 6 Oct 2008 13:52:44 +0000 (13:52 +0000)]
Allow the monitor to be suspended during non-blocking op
Live migration happens in the background, but it is useful to make the monitor
command appear as if it's blocking. This allows a management tool to
immediately know when the live migration has completed without having to poll
the migration status.
This patch allows the monitor to be suspended from a monitor callback which
will prevent new monitor commands from being executed.
malc [Thu, 2 Oct 2008 20:02:27 +0000 (20:02 +0000)]
Do not use load_seg_vm to load CS in real mode iret handling
load_seg_vm calls cpu_x86_load_seg_cache which updates hflags of
current env, real hardware doesn't do this, nor the code that handles
real mode lret/lcall/ljmp.
This unbreaks "unreal mode" and makes QEMU the first emulator being
able to run Project Angel demo by IMPACT Studios. (Not that there are
many physical machines out there capable of doing the same)
aurel32 [Wed, 1 Oct 2008 22:01:37 +0000 (22:01 +0000)]
ppc: fix crash in ppc system single step support
There was a bogus case where two system debug ops get generated. This
patch removes the broken system debug op. This was a left over after
making some changes to correctly generate debug ops on branch
operations inside gen_goto_tb();
The test case against this patch is to turn on single stepping with
timers, boot a linux kernel, set a breakpoint a do_fork and in gdb
execute "si 3000". Then qemu-system-ppc will fault executing a debug
op, which should not have been executed.
aurel32 [Wed, 1 Oct 2008 21:45:51 +0000 (21:45 +0000)]
fix default size handling in monitor
If /i format is used once (with x/xp/p command) default_fmt_size is set
to -1 and subsequent commands of the form /x outputs nothing. Included
patched fixes this by setting default_fmt_size only if the command is
not of format /i.
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