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  1. 24 5月, 2013 1 次提交
    • S
      coroutine: stop using AioContext in CoQueue · 02ffb504
      由 Stefan Hajnoczi 提交于 
      qemu_co_queue_next(&queue) arranges that the next queued coroutine is
run at a later point in time.  This deferred restart is useful because
the caller may not want to transfer control yet.

This behavior was implemented using QEMUBH in the past, which meant that
CoQueue (and hence CoMutex and CoRwlock) had a dependency on the
AioContext event loop.  This hidden dependency causes trouble when we
move to a world with multiple event loops - now qemu_co_queue_next()
needs to know which event loop to schedule the QEMUBH in.

After pondering how to stash AioContext I realized the best solution is
to not use AioContext at all.  This patch implements the deferred
restart behavior purely in terms of coroutines and no longer uses
QEMUBH.

Here is how it works:

Each Coroutine has a wakeup queue that starts out empty.  When
qemu_co_queue_next() is called, the next coroutine is added to our
wakeup queue.  The wakeup queue is processed when we yield or terminate.
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
      02ffb504
  3. 20 5月, 2013 1 次提交
  5. 14 5月, 2013 2 次提交
  7. 13 5月, 2013 1 次提交
  9. 03 5月, 2013 2 次提交
  11. 02 5月, 2013 1 次提交
  13. 23 4月, 2013 1 次提交
  15. 19 4月, 2013 1 次提交
  17. 16 4月, 2013 6 次提交
    • G
      use libusb for usb-host · 2b2325ff
      由 Gerd Hoffmann 提交于 
      Reimplement usb-host on top of libusb.
Reasons to do this:

 (1) Largely rewritten from scratch, nice opportunity to kill historical
     cruft.
 (2) Offload usbfs handling to libusb.
 (3) Have a single portable code base instead of bsd + linux variants.
 (4) Bring usb-host support to any platform supported by libusbx.

For now this goes side-by-side to the existing code.  That is only to
simplify regression testing though, at the end of the day I want remove
the old code and support libusb exclusively.  Merge early in 1.5 cycle,
remove the old code after 1.5 release or something like this.

Thanks to qdev the old and new code can coexist nicely on linux.  Just
use "-device usb-host-linux" to use the old linux driver instead of the
libusb one (which takes over the "usb-host" name).

The bsd driver isn't qdev'ified so it isn't that easy for bsd.
I didn't bother making it runtime switchable, so you have to rebuild
qemu with --disable-libusb to get back the old code.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
      2b2325ff
    • G
      xhci: fix portsc writes · bdfce20d
      由 Gerd Hoffmann 提交于 
      Check for port reset first and skip everything else then.
Add sanity checks for PLS updates.
Add PLC notification when entering PLS_U0 state.

This gets host-initiated port resume going on win8.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
      bdfce20d
    • G
      console: gui timer fixes · 0f7b2864
      由 Gerd Hoffmann 提交于 
      Make gui update rate adaption code in gui_update() actually work.
Sprinkle in a tracepoint so you can see the code at work.  Remove
the update rate adaption code in vnc and make vnc simply use the
generic bits instead.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
      0f7b2864
    • G
      console: add trace events · 437fe106
      由 Gerd Hoffmann 提交于 
      Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
      437fe106
    • G
      hw/vmware_vga.c: various vmware vga fixes. · eb2f9b02
      由 Gerd Hoffmann 提交于 
      Hardcode depth to 32 bpp.  It effectively was that way before because
that is the default surface depth, this just makes it explicit in the
code.

Rename depth to new_depth to make it consistent with the new_width +
new_height names.  In theory we can make new_depth changeable (i.e.
allow the guest to fill in -- say -- 16 there).  In practice the guests
don't try, the X-Server refuses to start if you ask it to use 16bpp
depth (via DefaultDepth in the Screen section).

Always return the correct rmask+gmask+bmask values for the given
new_depth.

Fix mode setting to also verify at new_depth to make sure we have a
correct DisplaySurface, even if the current video mode happes to be
16bpp (set by vgabios via bochs vbe interface).  While being at it
switch over to use qemu_create_displaysurface_from, so the surface is
backed by guest-visible video memory and we save a memcpy.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
      eb2f9b02
    • G
      hw/vmware_vga.c: add tracepoints for mmio reads+writes · 7a6404cd
      由 Gerd Hoffmann 提交于 
      Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
      7a6404cd
  19. 03 4月, 2013 1 次提交
  21. 28 3月, 2013 3 次提交
  23. 18 3月, 2013 2 次提交
  25. 15 3月, 2013 1 次提交
  27. 13 3月, 2013 1 次提交
    • G
      Add search path support for qemu data files. · 4524051c
      由 Gerd Hoffmann 提交于 
      This patch allows to specify multiple directories where qemu should look
for data files.  To implement that the behavior of the -L switch is
slightly different now:  Instead of replacing the data directory the
path specified will be appended to the data directory list.  So when
specifiying -L multiple times all directories specified will be checked,
in the order they are specified on the command line, instead of just the
last one.

Additionally the default paths are always appended to the directory
data list.  This allows to specify a incomplete directory (such as the
seabios out/ directory) via -L.  Anything not found there will be loaded
from the default paths, so you don't have to create a symlink farm for
all the rom blobs.

For trouble-shooting a tracepoint has been added, logging which blob
has been loaded from which location.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Message-id: 1362739344-8068-1-git-send-email-kraxel@redhat.com
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
      4524051c
  29. 11 3月, 2013 1 次提交
  31. 06 3月, 2013 1 次提交
  33. 19 2月, 2013 1 次提交
  35. 30 1月, 2013 3 次提交
  37. 26 1月, 2013 6 次提交
    • P
      mirror: support arbitrarily-sized iterations · 884fea4e
      由 Paolo Bonzini 提交于 
      Yet another optimization is to extend the mirroring iteration to include more
adjacent dirty blocks.  This limits the number of I/O operations and makes
mirroring efficient even with a small granularity.  Most of the infrastructure
is already in place; we only need to put a loop around the computation of
the origin and sector count of the iteration.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
      884fea4e
    • P
      mirror: support more than one in-flight AIO operation · 402a4741
      由 Paolo Bonzini 提交于 
      With AIO support in place, we can start copying more than one chunk
in parallel.  This patch introduces the required infrastructure for
this: the buffer is split into multiple granularity-sized chunks,
and there is a free list to access them.

Because of copy-on-write, a single operation may already require
multiple chunks to be available on the free list.

In addition, two different iterations on the HBitmap may want to
copy the same cluster.  We avoid this by keeping a bitmap of in-flight
I/O operations, and blocking until the previous iteration completes.
This should be a pretty rare occurrence, though; as long as there is
no overlap the next iteration can start before the previous one finishes.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
      402a4741
    • P
      mirror: switch mirror_iteration to AIO · bd48bde8
      由 Paolo Bonzini 提交于 
      There is really no change in the behavior of the job here, since
there is still a maximum of one in-flight I/O operation between
the source and the target.  However, this patch already introduces
the AIO callbacks (which are unmodified in the next patch)
and some of the logic to count in-flight operations and only
complete the job when there is none.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
      bd48bde8
    • P
      mirror: perform COW if the cluster size is bigger than the granularity · b812f671
      由 Paolo Bonzini 提交于 
      When mirroring runs, the backing files for the target may not yet be
ready.  However, this means that a copy-on-write operation on the target
would fill the missing sectors with zeros.  Copy-on-write only happens
if the granularity of the dirty bitmap is smaller than the cluster size
(and only for clusters that are allocated in the source after the job
has started copying).  So far, the granularity was fixed to 1MB; to avoid
the problem we detected the situation and required the backing files to
be available in that case only.

However, we want to lower the granularity for efficiency, so we need
a better solution.  The solution is to always copy a whole cluster the
first time it is touched.  The code keeps a bitmap of clusters that
have already been allocated by the mirroring job, and only does "manual"
copy-on-write if the chunk being copied is zero in the bitmap.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
      b812f671
    • P
      block: implement dirty bitmap using HBitmap · 8f0720ec
      由 Paolo Bonzini 提交于 
      This actually uses the dirty bitmap in the block layer, and converts
mirroring to use an HBitmapIter.

Reviewed-by: Laszlo Ersek <lersek@redhat.com> (except block/mirror.c parts)
Reviewed-by: NEric Blake <eblake@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
      8f0720ec
    • P
      add hierarchical bitmap data type and test cases · e7c033c3
      由 Paolo Bonzini 提交于 
      HBitmaps provides an array of bits.  The bits are stored as usual in an
array of unsigned longs, but HBitmap is also optimized to provide fast
iteration over set bits; going from one bit to the next is O(logB n)
worst case, with B = sizeof(long) * CHAR_BIT: the result is low enough
that the number of levels is in fact fixed.

In order to do this, it stacks multiple bitmaps with progressively coarser
granularity; in all levels except the last, bit N is set iff the N-th
unsigned long is nonzero in the immediately next level.  When iteration
completes on the last level it can examine the 2nd-last level to quickly
skip entire words, and even do so recursively to skip blocks of 64 words or
powers thereof (32 on 32-bit machines).

Given an index in the bitmap, it can be split in group of bits like
this (for the 64-bit case):

     bits 0-57 => word in the last bitmap     | bits 58-63 => bit in the word
     bits 0-51 => word in the 2nd-last bitmap | bits 52-57 => bit in the word
     bits 0-45 => word in the 3rd-last bitmap | bits 46-51 => bit in the word

So it is easy to move up simply by shifting the index right by
log2(BITS_PER_LONG) bits.  To move down, you shift the index left
similarly, and add the word index within the group.  Iteration uses
ffs (find first set bit) to find the next word to examine; this
operation can be done in constant time in most current architectures.

Setting or clearing a range of m bits on all levels, the work to perform
is O(m + m/W + m/W^2 + ...), which is O(m) like on a regular bitmap.

When iterating on a bitmap, each bit (on any level) is only visited
once.  Hence, The total cost of visiting a bitmap with m bits in it is
the number of bits that are set in all bitmaps.  Unless the bitmap is
extremely sparse, this is also O(m + m/W + m/W^2 + ...), so the amortized
cost of advancing from one bit to the next is usually constant.
Reviewed-by: NLaszlo Ersek <lersek@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
      e7c033c3
  39. 22 1月, 2013 1 次提交
  41. 19 1月, 2013 2 次提交
  43. 08 1月, 2013 1 次提交