Many of these should be cleaned up with proper qdev-/QOM-ification.
Right now there are many catch-all headers in include/hw/ARCH depending
on cpu.h, and this makes it necessary to compile these files per-target.
However, fixing this does not belong in these patches.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* 'arm-devs.next' of git://git.linaro.org/people/pmaydell/qemu-arm:
hw/nand.c: Fix nand erase operation
cadence_uart: Flush queued characters on reset
pl330: Don't inhibit ES bits on INTEN
pflash_cfi01: Implement migration support
pflash_cfi01: Drop unused 'bypass' field
hw/arm_gic_common: Use vmstate struct rather than save/load functions
arm_gic: Fix sizes of state fields in preparation for vmstate support
vmstate: Add support for two dimensional arrays
hw/onenand.c: fix migration of dynamically allocated buffer "otp"
hw/sd.c: fix migration of dynamically allocated buffer "buf"
vmstate.h: introduce VMSTATE_BUFFER_POINTER_UNSAFE macro
hw/arm_mptimer: Save the timer state
pl050: Don't send always-constant is_mouse field
hw/arm/nseries: don't print to stdout or stderr
The char-flow refactoring introduced a busy-wait that depended on
an action from the VCPU thread. However, the VCPU thread could
never take that action because the busy-wait starved the VCPU thread
of the BQL because it never dropped the mutex while running select.
Paolo doesn't want to drop this optimization for fear that we will
stop detecting these busy waits. I'm afraid to keep this optimization
even with the busy-wait fixed because I think a similar problem can
occur just with heavy I/O thread load manifesting itself as VCPU pauses.
As a compromise, introduce an artificial timeout after a thousand
iterations but print a rate limited warning when this happens. This
let's us still detect when this condition occurs without it being
a fatal error.
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Message-id: 1365169560-11012-1-git-send-email-aliguori@us.ibm.com
The character backend refactoring introduced an undesirable busy wait.
The busy wait happens if can_read returns zero and there is data available
on the character device's file descriptor. Then, the I/O watch will
fire continuously and, with TCG, the CPU thread will never run.
1) Char backend asks front end if it can write
2) Front end says no
3) poll() finds the char backend's descriptor is available
4) Goto (1)
What we really want is this (note that step 3 avoids the busy wait):
1) Char backend asks front end if it can write
2) Front end says no
3) poll() goes on without char backend's descriptor
4) Goto (1) until qemu_chr_accept_input() called
5) Char backend asks front end if it can write
6) Front end says yes
7) poll() finds the char backend's descriptor is available
8) Backend handler called
After this patch, the IOWatchPoll source and the watch source are
separated. The IOWatchPoll is simply a hook that runs during the prepare
phase on each main loop iteration. The hook adds/removes the actual
source depending on the return value from can_read.
A simple reproducer is
qemu-system-i386 -serial mon:stdio
... followed by banging on the terminal as much as you can. :) Without
this patch, emulation will hang.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 1365177573-11817-1-git-send-email-pbonzini@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
# By Peter Crosthwaite (2) and others
# Via Stefan Hajnoczi
* stefanha/trivial-patches:
xilinx_zynq: Cleanup ssi_create_slave
petalogix_ml605_mmu: Cleanup ssi_create_slave()
target-s390: Fix SRNMT
linux-user: Don't omit comma for strace of rt_sigaction()
test-visitor-serialization: Fix some memory leaks
# By Alex Bligh (2) and Felipe Franciosi (2)
# Via Stefano Stabellini
* sstabellini/xen-2013-04-05:
Allow xen guests to plug disks of 1 TiB or more
Introduce 64 bit integer write interface to xenstore
Xen PV backend: Disable use of O_DIRECT by default as it results in crashes.
Xen PV backend: Move call to bdrv_new from blk_init to blk_connect
# By Stefan Hajnoczi (4) and Kevin Wolf (3)
# Via Kevin Wolf
* kwolf/for-anthony:
qcow2: Fix L1 write error handling in qcow2_update_snapshot_refcount
qcow2: Return real error in qcow2_update_snapshot_refcount
block: clean up I/O throttling wait_time code
block: drop duplicated slice extension code
block: keep I/O throttling slice time constant
block: fix I/O throttling accounting blind spot
usb-storage: Forward serial number to scsi-disk
It ignored the error code, and at least the 'goto fail' is obvious
nonsense as it creates an endless loop (if the next attempt doesn't
magically succeed) and leaves the in-memory L1 table in big-endian
instead of converting it back.
In error cases, there's no point in writing an updated L1 table, so
skip this part for them.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
The wait_time variable is in seconds. Reflect this in a comment and use
NANOSECONDS_PER_SECOND instead of BLOCK_IO_SLICE_TIME * 10 (which
happens to have the right value).
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Tested-By: Benoit Canet <benoit@irqsave.net>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
The current slice is extended when an I/O request exceeds the limit.
There is no need to extend the slice every time we check a request.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Tested-By: Benoit Canet <benoit@irqsave.net>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
It is not necessary to adjust the slice time at runtime. We already
extend the current slice in order to carry over accounting into the next
slice. Changing the actual slice time value introduces oscillations.
The guest may experience large changes in throughput or IOPS from one
moment to the next when slice times are adjusted.
Reported-by: Benoît Canet <benoit@irqsave.net>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Tested-By: Benoit Canet <benoit@irqsave.net>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
I/O throttling relies on bdrv_acct_done() which is called when a request
completes. This leaves a blind spot since we only charge for completed
requests, not submitted requests.
For example, if there is 1 operation remaining in this time slice the
guest could submit 3 operations and they will all be submitted
successfully since they don't actually get accounted for until they
complete.
Originally we probably thought this is okay since the requests will be
accounted when the time slice is extended. In practice it causes
fluctuations since the guest can exceed its I/O limit and it will be
punished for this later on.
Account for I/O upon submission so that I/O limits are enforced
properly.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Tested-By: Benoit Canet <benoit@irqsave.net>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
usb-storage takes care to fetch the USB serial number from -drive
options, but it neglected to pass its own 'serial' property to the
scsi-disk it creates. With this patch, the 'serial' qdev property and
the 'serial' option in -drive behave the same and correctly apply the
serial number on both USB and SCSI level.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Usually, nand erase operation has only 2 or 3 address cycles.
We need to mask s->addr to zero unset stale high-order bytes in the nand address
before using it as the erase address.
This fixes the NAND erase operation in Linux.
[PC: Generalised to work for any number of address cycles rather than just 3]
Signed-off-by: Wendy Liang <jliang@xilinx.com>
Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Message-id: 1364967188-26711-1-git-send-email-peter.crosthwaite@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reset can be used to empty the rx-fifo. As the fifo full condition is
used to return false from can_receive, queued rx data should be flushed
on reset accordingly.
Cc: Wendy Liang <jliang@xilinx.com>
Cc: Jason Wu <huanyu@xilinx.com>
Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Reported-by: Jason Wu <huanyu@xilinx.com>
Message-id: 494c1e005e225c915d295ddfd75d992ad2dabc3c.1364964526.git.peter.crosthwaite@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This if-else logic inhibits setting of the event status (ES) bits
when interrupts are enabled. This is incorrect. ES should be set
regardless on INTEN state. INTEN only inhibits the signalling of
events to PL330 threads, not setting of the ES register.
Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
The current xen backend driver implementation uses int64_t variables
to store the size of the corresponding backend disk/file. It also uses
an int64_t variable to store the block size of that image. When writing
the number of sectors (file_size/block_size) to xenstore, however, it
passes these values as 32 bit signed integers. This will cause an
overflow for any disk of 1 TiB or more.
This patch changes the xen backend driver to use a 64 bit integer write
xenstore function.
Signed-off-by: Felipe Franciosi <felipe@paradoxo.org>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
The current implementation of xen_backend only provides 32 bit integer
functions to write to xenstore. This patch adds two functions that
allow writing 64 bit integers (one generic function and another for
the backend only).
This patch also fixes the size of the char arrays used to represent
these integers as strings (originally 32 bytes, however no more than
12 bytes are needed for 32 bit integers and no more than 21 bytes are
needed for 64 bit integers).
Signed-off-by: Felipe Franciosi <felipe@paradoxo.org>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Due to what is almost certainly a kernel bug, writes with O_DIRECT may
continue to reference the page after the write has been marked as
completed, particularly in the case of TCP retransmit. In other
scenarios, this "merely" risks data corruption on the write, but with
Xen pages from domU are only transiently mapped into dom0's memory,
resulting in kernel panics when they are subsequently accessed.
This brings PV devices in line with emulated devices. Removing
O_DIRECT is safe as barrier operations are now correctly passed
through.
See:
http://lists.xen.org/archives/html/xen-devel/2012-12/msg01154.html
for more details.
Signed-off-by: Alex Bligh <alex@alex.org.uk>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
This commit delays the point at which bdrv_new (and hence blk_open
on the underlying device) is called from blk_init to blk_connect.
This ensures that in an inbound live migrate, the block device is
not opened until it has been closed at the other end. This is in
preparation for supporting devices with open/close consistency
without using O_DIRECT. This commit does NOT itself change O_DIRECT
semantics.
Signed-off-by: Alex Bligh <alex@alex.org.uk>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
For pflash_cfi01 the 'bypass' field is set to zero and never changes,
so remove it (it is a leftover from pflash_cfi02, where bypass is
implemented).
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1363717469-30980-2-git-send-email-peter.maydell@linaro.org
Update the GIC save/restore to use vmstate rather than hand-rolled
save/load functions.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Igor Mitsyanko <i.mitsyanko@gmail.com>
Message-id: 1363975375-3166-4-git-send-email-peter.maydell@linaro.org
In preparation for switching to vmstate for migration support, fix
the sizes of various GIC state fields. In particular, we replace all
the bitfields (which VMState can't deal with) with straightforward
uint8_t values which we do bit operations on. (The bitfields made
more sense when NCPU was set differently in different situations,
but we now always model at the architectural limit of 8.)
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Igor Mitsyanko <i.mitsyanko@gmail.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Message-id: 1363975375-3166-3-git-send-email-peter.maydell@linaro.org
Add support for migrating two dimensional arrays, by defining
a set of new macros VMSTATE_*_2DARRAY paralleling the existing
VMSTATE_*_ARRAY macros. 2D arrays are handled the same for actual
state serialization; the only difference is that the type check
has to change for a 2D array.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Igor Mitsyanko <i.mitsyanko@gmail.com>
Message-id: 1363975375-3166-2-git-send-email-peter.maydell@linaro.org
VMSTATE_BUFFER_UNSAFE should be used for buffers inlined in device state, not
for buffers allocated dynamically. Change to VMSTATE_BUFFER_POINTER_UNSAFE macro,
which will do migration right.
Signed-off-by: Igor Mitsyanko <i.mitsyanko@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1362923278-4080-4-git-send-email-i.mitsyanko@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
