| Commit message (Collapse) | Author | Age | Files | Lines |
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Basically, the main wait loop calls qemu_run_all_timers() unconditionally. The
first thing this routine used to do is to see if a timer had been serviced,
and then reset the loop timeout to the next deadline.
However, the new deadlines had not been calculated at that point, as
qemu_run_timers() had not been called yet for each of the clocks. So
qemu_rearm_alarm_timer() would end up with a negative or zero deadline, and
default to setting a 250us timeout for the loop.
As qemu_run_timers() is called for each clock, the real deadlines would be put
in place, but because a loop timeout was already set, the loop timeout would
not be changed.
Once that 250us timeout fired, the real deadline would be used for the
subsequent timeout.
For idle VMs, this effectively doubles the number of times through the loop,
doubling the number of select() system calls, timer calls, etc. putting added
scheduling pressure on the kernel. And under cgroups, this really causes a big
problem because the cgroup code does not scale well.
By simply running the timers before trying to rearm the timer, we always rearm
with a non-zero deadline, effectively halving the number of system calls.
Signed-off-by: Peter Portante <pportant@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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* kiszka/queues/pending:
vapic: Disable for pre-1.1 machines
Kick io-thread on qemu_chr_accept_input
pcnet: Properly handle TX requests during Link Fail
pcnet: Clear ERR in CSR0 on stop
signrom: Rewrite as python script
Conflicts:
hw/pc_piix.c
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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The kvmvapic was not present in older QEMU versions, thus must be
disabled in compat machines.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
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Once a chr frontend is able to receive input again, we need to inform
the io-thread about this fact. Otherwise, main_loop_wait may continue to
select without the related backend file descriptor in its set. This can
cause high input latencies if only low-rate events arrive otherwise.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
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As long as we have no link and we aren't in internal loopback mode, no
packet must be sent. Instead, LCAR needs to be set in any active TX
descriptor and also CERR in CSR0.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
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pcnet_stop already clears any reason (BABL, CERR, MISS, MERR) why ERR
(bit 15) should be set in CRS0. So we have to clear that bit as well.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
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Now that we have a hard dependency on python anyway, we can replace the
slow shell script to calculate the option ROM checksum with a fast AND
portable python version. Tested both with python 2.7 and 3.1.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
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* mst/tags/for_anthony:
pci: fix corrupted pci conf index register by unaligned write
acpi: explicitly account for >1 device per slot
acpi_piix4: Re-define PCI hotplug eject register read
acpi_piix4: Remove PCI_RMV_BASE write code
acpi_piix4: Fix PCI hotplug race
acpi_piix4: Disallow write to up/down PCI hotplug registers
virtio-pci: change virtio balloon PCI class code
ivshmem: add missing msix calls
vhost: readd assert statement
vhost: Fix size of dirty log sync on resize
pc: reduce duplication in compat machine types
piix_pci: fix typo in i400FX chipset init code
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Commit d0ed8076cbdc261 converted the PCI config access to the memory
API, but also inadvertantly changed it to accept unaligned writes,
and corrupt the index register in the process. This causes a regression
booting NetBSD.
Fix by ignoring unaligned or non-dword writes.
https://bugs.launchpad.net/qemu/+bug/897771
Reported-by: Andreas Gustafsson <gson@gson.org>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Slot present bit is cleared apparently for each device. Hotplug and non
hotplug devices should not mix normally, and we only set the bit when we
add a device so it should all work out, but it's more robust to
explicitly account for more than one device per slot.
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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The PCI hotplug eject register has always returned 0, so let's redefine
it as a hotplug feature register. The existing model of using separate
up & down read-only registers and an eject via write to this register
becomes the base implementation. As we make use of new interfaces we'll
set bits here to allow the BIOS and AML implementation to optimize for
the platform implementation.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Clarify this register as read-only and remove write code. No
change in existing behavior.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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As Michael Tsirkin demonstrated, current PCI hotplug is vulnerable
to a few races. The first is a race with other hotplug operations
because we clear the up & down registers at each event. If a new
event comes before the last is processed, up/down is cleared and
the event is lost.
To fix this for the down register, we create a life cycle for
the event request that starts with the hot unplug request in
piix4_device_hotplug() and ends when the device is ejected.
This allows us to mask and clear individual bits, preserving them
against races. For the up register, we have no clear end point
for when the event is finished. We could modify the BIOS to
acknowledge the bit and clear it, but this creates BIOS compatibiliy
issues without offering a complete solution. Instead we note that
gratuitous ACPI device checks are not harmful, which allows us to
issue a device check for every slot. We know which slots are present
and we know which slots are hotpluggable, so we can easily reduce
this to a more manageable set for the guest.
The other race Michael noted was that an unplug request followed
by reset may also lose the eject notification, which may also
result in the eject request being lost which a subsequent add
or remove. Once we're in reset, the device is unused and we can
flush the queue of device removals ourselves. Previously if a
device_del was issued to a guest without ACPI PCI hotplug support,
it was necessary to shutdown the guest to recover the device.
With this, a guest reboot is sufficient.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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The write side of these registers is never used and actually can't be
used as defined because any read/modify/write sequence from the guest
potentially races with qemu. Drop the write support and define these
as read-only registers.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Currently the virtio balloon device, when using the virtio-pci interface
advertises itself with PCI class code MEMORY_RAM. This is wrong; the
balloon is vaguely related to memory, but is nothing like a PCI memory
device in the meaning of the class code, and this code is not required
or suggested by the virtio PCI specification.
Worse, this patch causes problems on the pseries machine, because the
firmware, seeing this class code, advertises the device as memory in the
device tree, and then a guest kernel bug causes it to see this "memory"
before the real system memory, leading to a crash in early boot.
This patch fixes the problem by removing the bogus PCI class code on the
balloon device. The backwards compatibility PC machines get new compat
properties so that they don't change.
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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ivshmem used msix but didn't call it on either reset or
config write paths. This used to partically work since
guests don't use all of msi-x configuration fields,
and reset is rarely used, but the patch 'msix: track function masked
in pci device state' broke that. Fix by adding appropriate calls.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reported-by: Cam Macdonell <cam@cs.ualberta.ca>
Tested-by: Cam Macdonell <cam@cs.ualberta.ca>
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It's clear from the surrounding code that
start < end so it's enough to assert end < log_size.
However, it's better to make this explicit in case
we refactor the code again.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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When the vhost log is resized, we want to sync up to
the size of the old log. With that end address in place,
ignore regions that start after then end rather than
hitting assert.
This also addresses the following crash report:
When migrating a vm using vhost-net we hit the following assertion:
qemu-kvm: /usr/src/packages/BUILD/qemu-kvm-0.15.1/hw/vhost.c:30:
vhost_dev_sync_region: Assertion `start / (0x1000 * (8 *
sizeof(vhost_log_chunk_t))) < dev->log_size' failed.
The cases which the end < start check is intended to catch, such as
for vga video memory, will also likely trigger the assertion.
Reorder the code to handle this correctly.
Reported-by: Josh Durgin <josh.durgin@dreamhost.com>
Signed-off-by: Bruce Rogers <brogers@suse.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Make it easier to add compat properties, by
adding macros for properties duplicated across
machine types.
Note: there could be bugs in compat properties,
this patch does not attempt to address them,
the code is bug for bug identical to the original.
Tested by: generated a preprocessed file, sorted and
compared to sorted original.
Lightly tested on x86_64.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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There is a typo in i440FX init code. This is causing problems when
somebody wants to access the 64bit PCI range.
Signed-off-by: Alexey Korolev <alexey.korolev@endace.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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* sstabellini/for_anthony:
xen: introduce an event channel for buffered io event notifications
xen-mapcache: don't unmap locked entry during mapcache invalidation
Xen, mapcache: Fix the compute of the size of bucket.
xen: handle backend deletion from xenstore
Xen: Add xen-apic support and hook it up.
Xen: basic HVM MSI injection support.
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Use the newly introduced HVM_PARAM_BUFIOREQ_EVTCHN to receive
notifications for buffered io events.
After the first notification is received leave the event channel masked
and setup a timer to process the rest of the batch.
Once we have completed processing the batch, unmask the event channel
and delete the timer.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
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When an IOREQ_TYPE_INVALIDATE is sent to QEMU, it invalidates all entry
of the map cache even if it's locked.
QEMU is not able to know that entry was invalidated, so when an IO
access is requested a segfault occured.
Signed-off-by: Julien Grall <julien.grall@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
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Because the size of a mapping is wrong when there is an offset and a
size >= bucket_size.
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
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Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
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Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
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* 'w64' of git://qemu.weilnetz.de/qemu:
w64: Fix time conversion for some versions of MinGW-w64
nbd: Fix compiler warning (w64)
disas: Replace 'unsigned long' by 'uintptr_t'
cpu-exec: Remove non-portable type cast and fix format string
target-mips: Fix type cast for w64 (uintptr_t)
w64: Fix type cast in os_host_main_loop_wait
w64: Fix data types in softmmu*.h
w64: Use uintptr_t in exec.c
softmmu: Use uintptr_t for physaddr and rename it
w64: Fix struct CPUTLBEntry
w64: Fix definition of setjmp
w32: Move defines for socket specific errors to qemu-os-win32.h
w64: Use larger alignment for section with generated code
w64: Fix data types in cpu-all.h, exec.c
w64: Fix type casts used in some macros in cpu-all.h
tcg/i386: Add support for w64 ABI
tcg/i386: Use GDB JIT debugging interface only for hosts with ELF
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tb.time is a time value, but not necessarily of the same size as time_t:
while time_t is 64 bit for w64, tb.time still is 32 bit only.
Therefore we need en explicit conversion.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
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Portable printing of dev_offset (data type off_t) needs a type cast.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
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This is needed for w64. It changes nothing for other hosts.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
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This change is needed for w64, but also changes the code for other hosts.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
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This changes nothing for other hosts.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
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Casting a pointer to an integer must use (DWORD_PTR) instead of (DWORD).
This also matches the definition of 'fd' (gint for w32, gint64 for w64).
Signed-off-by: Stefan Weil <sw@weilnetz.de>
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w64 requires uintptr_t.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
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Replace all type casts to 'long' or 'unsigned long' by 'intptr_t' or 'uintptr_t'.
For type casts which are only used to extract the lower bits of an address
or to modify those bits, signedness does not matter. There I always use 'uintptr_t'.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
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Variable physaddr is a host address which should be represented by
data type 'uintptr_t'.
This is needed for w64 and changes nothing for other hosts.
v2:
Rename physaddr -> hostaddr (suggested by Blue Swirl).
Signed-off-by: Stefan Weil <sw@weilnetz.de>
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For w64, some entries need 'uintptr_t' instead of 'unsigned long'.
For other host systems, both data types are identical, so nothing changes.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
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The default definition of setjmp which is implemented in MinGW-w64
cannot be used with programs like QEMU which call longjmp from
code without structured exception handling (SEH).
This code therefore disables stack unwinding.
We could also implement SEH for QEMU's generated JIT code, but
that is much more difficult. Stack unwinding would also cost
execution time.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
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As those defines are only used for w32,
they should be in the header file for w32.
All files which include slirp.h or qemu_socket.h also
include qemu-os-win32.h.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
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The MinGW-w64 compiler allows __attribute__((aligned (32)).
Signed-off-by: Stefan Weil <sw@weilnetz.de>
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w64 needs uintptr_t instead of unsigned long.
For other hosts, nothing changes.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
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Instead of type casts to long, w64 needs type casts to intptr_t.
For other hosts, this changes nothing.
Signed-off-by: Stefan Weil <sw@weilnetz.de>
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w64 uses the registers rcx, rdx, r8 and r9 for function arguments,
so it needs a different declaration of tcg_target_call_iarg_regs.
rax, rcx, rdx, r8, r9, r10 and r11 may be changed by function calls.
rbx, rbp, rdi, rsi, r12, r13, r14 and r15 remain unchanged by function calls.
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Stefan Weil <sw@weilnetz.de>
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Not all i386 / x86_64 hosts use ELF.
Ask the compiler whether ELF is used.
On w64, gdb crashes when ELF_HOST_MACHINE is defined.
Cc: Blue Swirl <blauwirbel@gmail.com>
Acked-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Stefan Weil <sw@weilnetz.de>
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Move code from cpu_alpha_init() into a CPU initializer.
Signed-off-by: Andreas Färber <afaerber@suse.de>
Acked-by: Richard Henderson <rth@twiddle.net>
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Embed CPUAlphaState as first member of AlphaCPU.
Signed-off-by: Andreas Färber <afaerber@suse.de>
Acked-by: Richard Henderson <rth@twiddle.net>
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* 'ppc-for-upstream' of git://repo.or.cz/qemu/agraf:
pseries: Fix reset of VIO network device
pseries: Reset vscsi properly
pseries: Correctly use the device model reset hooks
pseries: Remove old hcalls hook stub
pseries: Remove old debug leftovers from spapr_vscsi
pseries: Fix RTAS based config access
target-ppc/machine.c: Drop unnecessary ifdefs
target-ppc: Init dcache and icache size for e500 user mode
target-ppc: Fix type casts for w64 (uintptr_t)
target-ppc: QOM'ify CPU reset
target-ppc: Start QOM'ifying CPU init
target-ppc: QOM'ify CPU
target-ppc: Add hooks for handling tcg and kvm limitations
target-ppc: Drop cpu_ppc_close()
pseries: Consolidate hack for RTAS display-character usage
pseries: Remove unused fields from VIOsPAPRBus structure
pseries: Implement RTAS system-reboot call
pseries: Fix bug with reset of VIO CRQs
pseries: Clean up hcall_dprintf() debugging messages
PPC: Fix TLB invalidation bug within the PPC interrupt handler.
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Currently, the PAPR VIO network device does not have a reset handler. This
means that after a hard reset, H_REGISTER_LOGICAL_LAN will return an error
when the new guest boot attempts to initialize the device.
This patch corrects this, adding a suitable reset hook.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Andreas Färber <afaerber@suse.de>
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Currently the PAPR vscsi implementation does not properly clear its table
of request tags when the system is reset. This patch adds a reset hook
to do so.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Andreas Färber <afaerber@suse.de>
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