This is not needed since the RAM list is not modified anymore by
qemu_get_ram_ptr. Replace it with qemu_get_ram_block.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Computing the deadline of all vm_clocks is somewhat expensive and calls
out to qemu-timer.c; two reasons not to do it in the seqlock's write-side
critical section. This however opens the door for races in setting and
reading vm_clock_warp_start.
To plug them, we need to cover the case where a new deadline slips in
between the call to qemu_clock_deadline_ns_all and the actual modification
of the icount_warp_timer. Restrict changes to vm_clock_warp_start and
the icount_warp_timer's expiration time, to only move them back (which
would simply cause an early wakeup).
If a vm_clock timer is cancelled while CPUs are idle, this might cause the
icount_warp_timer to fire unnecessarily. This is not a problem, after it
fires the timer becomes inactive and the next call to timer_mod_anticipate
will be precise.
In addition to this, we must deactivate the icount_warp_timer _before_
checking whether CPUs are idle. This way, if the "last" CPU becomes idle
during the call to timer_del we will still set up the icount_warp_timer.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
To prepare for future code changes, move the increment of qemu_icount_bias
outside the "if" statement.
Also, hoist outside the if the check for timers that expired due to the
"warping". The check is redundant when !runstate_is_running(), but
doing it this way helps because the code that increments qemu_icount_bias
will be a critical section.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This will help later when we will have to place these calls in
a critical section, and thus call a version of cpu_get_icount()
that does not take the lock.
Reviewed-by: Alex Bligh <alex@alex.org.uk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
These let a user anticipate the deadline of a timer, atomically with
other sites that call the function. This helps avoiding complicated
lock hierarchies.
Reviewed-by: Alex Bligh <alex@alex.org.uk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
After disabling the QemuClock, we should make sure that no QemuTimers
are still in flight. To implement that with light overhead, we resort
to QemuEvent. The caller of disabling will wait on QemuEvent of each
timerlist.
Note, qemu_clock_enable(foo,false) can _not_ be called from timer's cb.
Also, the callers of qemu_clock_enable() should be protected by the BQL.
Signed-off-by: Liu Ping Fan <pingfank@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This emulates Win32 manual-reset events using futexes or conditional
variables. Typical ways to use them are with multi-producer,
single-consumer data structures, to test for a complex condition whose
elements come from different threads:
for (;;) {
qemu_event_reset(ev);
... test complex condition ...
if (condition is true) {
break;
}
qemu_event_wait(ev);
}
Or more efficiently (but with some duplication):
... evaluate condition ...
while (!condition) {
qemu_event_reset(ev);
... evaluate condition ...
if (!condition) {
qemu_event_wait(ev);
... evaluate condition ...
}
}
QemuEvent provides a very fast userspace path in the common case when
no other thread is waiting, or the event is not changing state.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
QEMU_CLOCK_VIRTUAL may be read outside BQL. This will make its
foundation, i.e. cpu_clock_offset exposed to race condition.
Using private lock to protect it.
After this patch, reading QEMU_CLOCK_VIRTUAL is thread safe
unless use_icount is true, in which case the existing callers
still rely on the BQL.
Lock rule: private lock innermost, ie BQL->"this lock"
Signed-off-by: Liu Ping Fan <pingfank@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Seqlock implementation for QEMU. Usage idiom
reader:
do {
start = seqlock_read_begin(&sl);
...
} while (seqlock_read_retry(&sl, start));
writer:
seqlock_write_lock(&sl);
...
seqlock_write_unlock(&sl);
initialization:
seqlock_init(QemuSeqLock *sl, QemuMutex *mutex)
mutex could be NULL if the caller will provide its own protection
for concurrent write sides (typically using the BQL).
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This allows to remove the explicit qemu_flush_coalesced_mmio_buffer
calls.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This allows to remove the explicit qemu_flush_coalesced_mmio_buffer
calls - the memory core will invoke them now.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This will enable us to remove all remaining explicit calls of
qemu_flush_coalesced_mmio_buffer in IO handlers.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
qemu_thread_create already does signal blocking and detaching for us.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
mtree_print_mr() calls int128_get64() in 3 places but only 2 places
handle 2^64 correctly.
This fixes the third call of int128_get64().
Cc: qemu-stable@nongnu.org
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
On one occasion, hdev_open() returned -1 in case of an unknown error
instead of a proper -errno value. Adjust this to match the behavior of
raw_open() (in raw-win32), which is to return -EINVAL in this case.
Also, change the call to error_setg*() to match the one in raw_open() as
well.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
We have a fw_cfg entry to pass e820 entries from qemu to the firmware.
Today it's used to pass reservations only. This patch makes qemu pass
entries for RAM too.
This allows to pass RAM sizes larger than 1TB to the firmware and it
will also allow to pass non-contignous memory ramges should we decide
to implement that some day, say for our virtual numa nodes.
Obviously this needs some extra care to not break existing firware.
SeaBIOS loads the entries and happily adds them without looking at the
type. Which is problematic for memory below 4g as this will overwrite
reservations added for bios memory etc. For memory above 4g it works
just fine, seabios will merge the entry derived from cmos with the one
loaded from fw_cfg.
OVMF doesn't look at the fw_cfg e820 table.
coreboot doesn't look at the fw_cfg e820 table.
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-By: Igor Mammedov <imammedo@redhat.com>
This patch fixes spice display initialization to handle
multihead properly.
spice-core now keeps track of which QemuConsole has a spice
display channel attached to it and which has not. It also
manages display channel ids.
spice-display looks at all QemuConsoles and will pick up any
graphic console not yet bound to a spice channel (which in practice
are all non-qxl graphic devices).
Result is that
(a) you'll get a spice client window for each graphical device
now (first only without this patch), and
(b) mixing qxl and non-qxl vga cards works properly.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
ui/vnc.c:vnc_display_open() and spice-server/server/reds.c:do_spice_init()
are both calling sasl_server_init(). If spice_server_set_sasl_appname()
hasn't been called, spice-server will call it with "spice" as an appname,
causing cyrus-sasl to try to use a /etc/sasl2/spice.conf config file rather
than the /etc/sasl2/qemu.conf file that QEMU uses.
When using -spice sasl on the command line, QEMU properly calls
spice_server_set_sasl_appname() to set the SASL appname as "qemu",
but when using a QXL device without using SPICE, spice_server_init()
is called from qemu_spice_add_interface() without setting the appname
to "qemu", which then causes the VNC code to try to use spice.conf
instead of qemu.conf.
Signed-off-by: Christophe Fergeau <cfergeau@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Since 0ebd24e0, cdrom doesn't have read-only on by default, which will
error out when using an read only image. Fix it by setting the default
value when parsing opts.
Reported-by: Edivaldo de Araujo Pereira <edivaldoapereira@yahoo.com.br>
Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Commit 4f8a066b5f (blockdev: Remove IF_*
check for read-only blockdev_init) added a usage of bdrv_is_read_only()
to sd_init(), which is called for versatilepb, versatileab and
xilinx-zynq-a9 machines among others with NULL argument by default,
causing the new qom-test to fail.
Add a check to prevent this.
Suggested-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Commit 3e9fab690d ("block: Add support for
throttling burst max in QMP and the command line.") introduced bogus
"[not inserted]" output, possibly due to a merge failure. Remove this
artifact.
Output of 'info block'
scsi0-hd0: /images/f18-ppc64.qcow2 (qcow2)
[not inserted]
scsi0-cd2: [not inserted]
Removable device: not locked, tray closed
floppy0: [not inserted]
Removable device: not locked, tray closed
sd0: [not inserted]
Removable device: not locked, tray closed
There will be no additional lines between scsi0-hd0 and
scsi0-cd2.
At the same time, scsi0-hd0 already inserted, but still has
'[not inserted]' flag. This line should be removed.
This patch is to solve this.
Signed-off-by: Mike Qiu <qiudayu@linux.vnet.ibm.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Delete an unnecessary dependency for cocoa.o; we already have
a general rule that tells Make that we can build a .o file
from a .m source using an ObjC compiler, so this specific
rule is unnecessary. Further, it is using the dubious construct
"$(SRC_PATH)/$(obj)" to get at the source directory, which will
break when $(obj) is redefined as part of the preparation for
per-object library support.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Makefile.target: Build gdbstub-xml.o only when
TARGET_XML_FILES is not empty.
Signed-off-by: Ákos Kovács <akoskovacs@gmx.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
CONFIG_NO_* variables replaced with the lnot logical function
Signed-off-by: Ákos Kovács <akoskovacs@gmx.com>
[PMM: fixed a few CONFIG_NO_* uses that were missed]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Add new string testing functions which return a y/n result:
eq : are two strings equal (ignoring leading/trailing space)?
ne : are two strings unequal?
isempty : is a string empty?
notempty : is a string non-empty?
Based on an idea by Ákos Kovács <akoskovacs@gmx.com>.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Add new logical functions for handling y/n values like those we
use in CONFIG_FOO variables:
lnot : logical NOT
land : logical AND
lor : logical OR
lxor : logical XOR
leqv : logical equality, inverse of lxor
lif : like Make's $(if) but with an eq-like test
Based on an idea by Ákos Kovács <akoskovacs@gmx.com>.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
# By Richard Henderson
# Via Richard Henderson
* rth/tcg-ldst-6:
target-alpha: Convert to new ldst opcodes
tcg-ppc64: Support new ldst opcodes
tcg-ppc: Support new ldst opcodes
tcg-ppc64: Convert to le/be ldst helpers
tcg-ppc: Convert to le/be ldst helpers
tcg-ppc64: Use TCGMemOp within qemu_ldst routines
tcg-ppc: Use TCGMemOp within qemu_ldst routines
tcg-arm: Improve GUEST_BASE qemu_ld/st
tcg-arm: Convert to new ldst opcodes
tcg-arm: Tidy variable naming convention in qemu_ld/st
tcg-arm: Convert to le/be ldst helpers
tcg-arm: Use TCGMemOp within qemu_ldst routines
tcg-i386: Support new ldst opcodes
tcg-i386: Remove "cb" output restriction from qemu_st8 for i386
tcg-i386: Tidy softmmu routines
tcg-i386: Use TCGMemOp within qemu_ldst routines
tcg: Use TCGMemOp for TCGLabelQemuLdst.opc
Message-id: 1381620683-4568-1-git-send-email-rth@twiddle.net
Signed-off-by: Anthony Liguori <aliguori@amazon.com>
# By Sebastian Macke
# Via Jia Liu
* jliu/or32:
target-openrisc: Removes a non-conforming behavior for the first page of the memory
target-openrisc: Correct handling of page faults.
Message-id: 1380789702-18935-1-git-send-email-proljc@gmail.com
Signed-off-by: Anthony Liguori <aliguori@amazon.com>
- Forgotten MSI affinity patch posted several months ago
- Lazy option ROM loading to delay load until after device/bus resets
- Error reporting cleanups
- PCI hot reset support introduced with Linux v3.12 development kernels
- Debug build fix for int128
The lazy ROM loading and hot reset should help VGA assignment as we can
now do a bus reset when there are multiple devices on the bus, ex.
multi-function graphics and audio cards.
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Merge remote-tracking branch 'awilliam/tags/vfio-pci-for-qemu-20131010.0' into staging
vfio-pci updates include:
- Forgotten MSI affinity patch posted several months ago
- Lazy option ROM loading to delay load until after device/bus resets
- Error reporting cleanups
- PCI hot reset support introduced with Linux v3.12 development kernels
- Debug build fix for int128
The lazy ROM loading and hot reset should help VGA assignment as we can
now do a bus reset when there are multiple devices on the bus, ex.
multi-function graphics and audio cards.
# gpg: Signature made Thu 10 Oct 2013 11:26:39 AM PDT using RSA key ID 3BB08B22
# gpg: Can't check signature: public key not found
# By Alex Williamson (7) and Alexey Kardashevskiy (1)
# Via Alex Williamson
* awilliam/tags/vfio-pci-for-qemu-20131010.0:
vfio-pci: Fix endian issues in vfio_pci_size_rom()
vfio-pci: Add dummy PCI ROM write accessor
vfio: Fix debug output for int128 values
vfio-pci: Implement PCI hot reset
vfio-pci: Cleanup error_reports
vfio-pci: Lazy PCI option ROM loading
vfio-pci: Test device reset capabilities
vfio-pci: Add support for MSI affinity
Message-id: 20131010184122.31667.28382.stgit@bling.home
Signed-off-by: Anthony Liguori <aliguori@amazon.com>
phys_mem_alloc and its assigned values qemu_anon_ram_alloc and
legacy_s390_alloc must have identical argument lists.
legacy_s390_alloc uses the size parameter to call mmap, so size_t is
good enough for all of them.
This patch fixes compiler errors on i686 Linux hosts:
CC alpha-softmmu/exec.o
exec.c:752:51: error:
initialization from incompatible pointer type [-Werror]
exec.c: In function 'qemu_ram_alloc_from_ptr':
exec.c:1139:32: error:
comparison of distinct pointer types lacks a cast [-Werror]
exec.c: In function 'qemu_ram_remap':
exec.c:1283:21: error:
comparison of distinct pointer types lacks a cast [-Werror]
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-id: 1380481005-32399-1-git-send-email-sw@weilnetz.de
Signed-off-by: Anthony Liguori <aliguori@amazon.com>
We don't really support CPU throttling, so supply 0 PBLK length.
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Tested-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Tested-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This adds C code for generating ACPI tables at runtime,
imported from seabios git tree
commit 51684b7ced75fb76776e8ee84833fcfb6ecf12dd
Although ACPI tables come from a system BIOS on real hw,
it makes sense that the ACPI tables are coupled with the
virtual machine, since they have to abstract the x86 machine to
the OS's.
This is widely desired as a way to avoid the churn
and proliferation of QEMU-specific interfaces
associated with ACPI tables in bios code.
Notes:
As BIOS can reprogram devices prior to loading
ACPI tables, we pre-format ACPI tables but defer loading
hardware configuration there until tables are loaded.
The code structure was intentionally kept as close
to the seabios original as possible, to simplify
comparison and making sure we didn't lose anything
in translation.
Minor code duplication results, to help ensure there are no functional
regressions, I think it's better to merge it like this and do more code
changes in follow-up patches.
Cross-version compatibility concerns have been addressed:
ACPI tables are exposed to guest as FW_CFG entries.
When running with -M 1.5 and older, this patch disables ACPI
table generation, and doesn't expose ACPI
tables to guest.
As table content is likely to change over time,
the following measures are taken to simplify
cross-version migration:
- All tables besides the RSDP are packed in a single FW CFG entry.
This entry size is currently 23K. We round it up to 64K
to avoid too much churn there.
- Tables are placed in special ROM blob (not mapped into guest memory)
which is automatically migrated together with the guest, same
as BIOS code.
- Offsets where hardware configuration is loaded in ACPI tables
are also migrated, this is in case future ACPI changes make us
rearrange the tables in memory.
This patch reuses some code from SeaBIOS, which was originally under
LGPLv2 and then relicensed to GPLv3 or LGPLv3, in QEMU under GPLv2+. This
relicensing has been acked by all contributors that had contributed to the
code since the v2->v3 relicense. ACKs approving the v2+ relicensing are
listed below. The list might include ACKs from people not holding
copyright on any parts of the reused code, but it's better to err on the
side of caution and include them.
Affected SeaBIOS files (GPLv2+ license headers added)
<http://thread.gmane.org/gmane.comp.bios.coreboot.seabios/5949>:
src/acpi-dsdt-cpu-hotplug.dsl
src/acpi-dsdt-dbug.dsl
src/acpi-dsdt-hpet.dsl
src/acpi-dsdt-isa.dsl
src/acpi-dsdt-pci-crs.dsl
src/acpi.c
src/acpi.h
src/ssdt-misc.dsl
src/ssdt-pcihp.dsl
src/ssdt-proc.dsl
tools/acpi_extract.py
tools/acpi_extract_preprocess.py
Each one of the listed people agreed to the following:
> If you allow the use of your contribution in QEMU under the
> terms of GPLv2 or later as proposed by this patch,
> please respond to this mail including the line:
>
> Acked-by: Name <email address>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Jan Kiszka <jan.kiszka@siemens.com>
Acked-by: Jason Baron <jbaron@akamai.com>
Acked-by: David Woodhouse <David.Woodhouse@intel.com>
Acked-by: Gleb Natapov <gleb@redhat.com>
Acked-by: Marcelo Tosatti <mtosatti@redhat.com>
Acked-by: Dave Frodin <dave.frodin@se-eng.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Kevin O'Connor <kevin@koconnor.net>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Acked-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Acked-by: Isaku Yamahata <yamahata@valinux.co.jp>
Acked-by: Magnus Christensson <magnus.christensson@intel.com>
Acked-by: Hu Tao <hutao@cn.fujitsu.com>
Acked-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Tested-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Tested-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Add API to find HPET using QOM.
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Tested-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Tested-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Add API to find pvpanic device and get its io port.
Will be used to fill in guest info structure.
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Tested-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Tested-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This adds APIs that will be used to fill in
acpi tables, implemented using QOM,
to various ich9 components.
Some information is still missing in QOM,
so we fall back on lookups by type instead.
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Tested-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Tested-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This adds APIs that will be used to fill in guest acpi tables.
Some required information is still lacking in QOM, so we
fall back on lookups by type and returning explicit types.
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Tested-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Tested-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This defines a structure that will be used to fill in acpi tables
where relevant properties are not yet available using QOM.
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Tested-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Tested-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This adds a dynamic bios linker/loader.
This will be used by acpi table generation
code to:
- load each table in the appropriate memory segment
- link tables to each other
- fix up checksums after said linking
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Tested-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Tested-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Avoid a bit of code duplication, make
max file path constant reusable.
Suggested-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Tested-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Tested-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Paolo Bonzini
Liu Ping Fan
Jan Kiszka
Alexey Kardashevskiy
Max Reitz
Gerd Hoffmann
Christophe Fergeau
Marc-André Lureau
Fam Zheng
Andreas Färber
Mike Qiu
Peter Maydell
Ákos Kovács
Max Filippov
Anthony Liguori
Stefan Weil
Michael S. Tsirkin