The QIOChannelFile object already has its reference decremented by
g_autoptr. Trying to unref an extra time causes:
ERROR:../qom/object.c:1241:object_unref: assertion failed: (obj->ref > 0)
Fixes: a701c03dec ("migration: Drop reference to QIOChannel if file seeking fails")
Fixes: 6d3279655a ("migration: Fix file migration with fdset")
Reported-by: Jim Fehlig <jfehlig@suse.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
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Merge tag 'net-pull-request' of https://github.com/jasowang/qemu into staging
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# gpg: Signature made Fri 02 Aug 2024 01:10:04 PM AEST
# gpg: using RSA key 215D46F48246689EC77F3562EF04965B398D6211
# gpg: Good signature from "Jason Wang (Jason Wang on RedHat) <jasowang@redhat.com>" [undefined]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg: There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 215D 46F4 8246 689E C77F 3562 EF04 965B 398D 6211
* tag 'net-pull-request' of https://github.com/jasowang/qemu:
net: Reinstate '-net nic, model=help' output as documented in man page
net: update netdev stream man page with the reconnect parameter
net: update netdev dgram man page with unix socket
net: update netdev stream man page with unix socket
net: update netdev stream/dgram man page
virtio-net: Fix network stall at the host side waiting for kick
virtio-net: Ensure queue index fits with RSS
rtl8139: Fix behaviour for old kernels.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
While refactoring the NIC initialization code, I broke '-net nic,model=help'
which no longer outputs a list of available NIC models.
Fixes: 2cdeca04ad ("net: report list of available models according to platform")
Cc: qemu-stable@nongnu.org
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Jason Wang <jasowang@redhat.com>
"-netdev stream" supports a reconnect parameter that attempts to
reconnect automatically the socket if it is disconnected. The code
has been added but the man page has not been updated.
Fixes: 148fbf0d58 ("net: stream: add a new option to automatically reconnect"
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Add the description of "-netdev dgram" with a unix domain socket.
The code has been added but the man page has not been updated.
Fixes: 784e7a2531 ("net: dgram: add unix socket")
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Add the description of "-netdev stream" with a unix domain socket.
The code has been added but the man page has not been updated.
Include an example how to use "-netdev stream" and "passt" in place
of "-netdev user".
("passt" is a non privileged translation proxy between layer-2, like
"-netdev stream", and layer-4 on host, like TCP, UDP, ICMP/ICMPv6 echo)
Fixes: 13c6be9661 ("net: stream: add unix socket")
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Add the description of "-netdev stream" and "-netdev dgram" in the QEMU
manpage.
Add some examples on how to use them.
Fixes: 5166fe0ae4 ("qapi: net: add stream and dgram netdevs")
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Patch 06b1297017 ("virtio-net: fix network stall under load")
added double-check to test whether the available buffer size
can satisfy the request or not, in case the guest has added
some buffers to the avail ring simultaneously after the first
check. It will be lucky if the available buffer size becomes
okay after the double-check, then the host can send the packet
to the guest. If the buffer size still can't satisfy the request,
even if the guest has added some buffers, viritio-net would
stall at the host side forever.
The patch enables notification and checks whether the guest has
added some buffers since last check of available buffers when
the available buffers are insufficient. If no buffer is added,
return false, else recheck the available buffers in the loop.
If the available buffers are sufficient, disable notification
and return true.
Changes:
1. Change the return type of virtqueue_get_avail_bytes() from void
to int, it returns an opaque that represents the shadow_avail_idx
of the virtqueue on success, else -1 on error.
2. Add a new API: virtio_queue_enable_notification_and_check(),
it takes an opaque as input arg which is returned from
virtqueue_get_avail_bytes(). It enables notification firstly,
then checks whether the guest has added some buffers since
last check of available buffers or not by virtio_queue_poll(),
return ture if yes.
The patch also reverts patch "06b12970174".
The case below can reproduce the stall.
Guest 0
+--------+
| iperf |
---------------> | server |
Host | +--------+
+--------+ | ...
| iperf |----
| client |---- Guest n
+--------+ | +--------+
| | iperf |
---------------> | server |
+--------+
Boot many guests from qemu with virtio network:
qemu ... -netdev tap,id=net_x \
-device virtio-net-pci-non-transitional,\
iommu_platform=on,mac=xx:xx:xx:xx:xx:xx,netdev=net_x
Each guest acts as iperf server with commands below:
iperf3 -s -D -i 10 -p 8001
iperf3 -s -D -i 10 -p 8002
The host as iperf client:
iperf3 -c guest_IP -p 8001 -i 30 -w 256k -P 20 -t 40000
iperf3 -c guest_IP -p 8002 -i 30 -w 256k -P 20 -t 40000
After some time, the host loses connection to the guest,
the guest can send packet to the host, but can't receive
packet from the host.
It's more likely to happen if SWIOTLB is enabled in the guest,
allocating and freeing bounce buffer takes some CPU ticks,
copying from/to bounce buffer takes more CPU ticks, compared
with that there is no bounce buffer in the guest.
Once the rate of producing packets from the host approximates
the rate of receiveing packets in the guest, the guest would
loop in NAPI.
receive packets ---
| |
v |
free buf virtnet_poll
| |
v |
add buf to avail ring ---
|
| need kick the host?
| NAPI continues
v
receive packets ---
| |
v |
free buf virtnet_poll
| |
v |
add buf to avail ring ---
|
v
... ...
On the other hand, the host fetches free buf from avail
ring, if the buf in the avail ring is not enough, the
host notifies the guest the event by writing the avail
idx read from avail ring to the event idx of used ring,
then the host goes to sleep, waiting for the kick signal
from the guest.
Once the guest finds the host is waiting for kick singal
(in virtqueue_kick_prepare_split()), it kicks the host.
The host may stall forever at the sequences below:
Host Guest
------------ -----------
fetch buf, send packet receive packet ---
... ... |
fetch buf, send packet add buf |
... add buf virtnet_poll
buf not enough avail idx-> add buf |
read avail idx add buf |
add buf ---
receive packet ---
write event idx ... |
wait for kick add buf virtnet_poll
... |
---
no more packet, exit NAPI
In the first loop of NAPI above, indicated in the range of
virtnet_poll above, the host is sending packets while the
guest is receiving packets and adding buffers.
step 1: The buf is not enough, for example, a big packet
needs 5 buf, but the available buf count is 3.
The host read current avail idx.
step 2: The guest adds some buf, then checks whether the
host is waiting for kick signal, not at this time.
The used ring is not empty, the guest continues
the second loop of NAPI.
step 3: The host writes the avail idx read from avail
ring to used ring as event idx via
virtio_queue_set_notification(q->rx_vq, 1).
step 4: At the end of the second loop of NAPI, recheck
whether kick is needed, as the event idx in the
used ring written by the host is beyound the
range of kick condition, the guest will not
send kick signal to the host.
Fixes: 06b1297017 ("virtio-net: fix network stall under load")
Cc: qemu-stable@nongnu.org
Signed-off-by: Wencheng Yang <east.moutain.yang@gmail.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Ensure the queue index points to a valid queue when software RSS
enabled. The new calculation matches with the behavior of Linux's TAP
device with the RSS eBPF program.
Fixes: 4474e37a5b ("virtio-net: implement RX RSS processing")
Reported-by: Zhibin Hu <huzhibin5@huawei.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Old linux kernel rtl8139 drivers (ex. debian 2.1) uses outb to set the rx
mode for RxConfig. Unfortunatelly qemu does not support outb for RxConfig.
Signed-off-by: Hans <sungdgdhtryrt@gmail.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
revert virtio pci/SR-IOV emulation at author's request
a couple of fixes in virtio,vtd
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Merge tag 'for_upstream' of https://git.kernel.org/pub/scm/virt/kvm/mst/qemu into staging
virtio,pci,pc: fixes
revert virtio pci/SR-IOV emulation at author's request
a couple of fixes in virtio,vtd
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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# gpg: Signature made Thu 01 Aug 2024 06:33:25 PM AEST
# gpg: using RSA key 5D09FD0871C8F85B94CA8A0D281F0DB8D28D5469
# gpg: issuer "mst@redhat.com"
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>" [undefined]
# gpg: aka "Michael S. Tsirkin <mst@redhat.com>" [undefined]
# gpg: WARNING: The key's User ID is not certified with a trusted signature!
# gpg: There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 0270 606B 6F3C DF3D 0B17 0970 C350 3912 AFBE 8E67
# Subkey fingerprint: 5D09 FD08 71C8 F85B 94CA 8A0D 281F 0DB8 D28D 5469
* tag 'for_upstream' of https://git.kernel.org/pub/scm/virt/kvm/mst/qemu:
intel_iommu: Fix for IQA reg read dropped DW field
hw/i386/amd_iommu: Don't leak memory in amdvi_update_iotlb()
Revert "hw/pci: Rename has_power to enabled"
Revert "hw/ppc/spapr_pci: Do not create DT for disabled PCI device"
Revert "hw/ppc/spapr_pci: Do not reject VFs created after a PF"
Revert "pcie_sriov: Do not manually unrealize"
Revert "pcie_sriov: Ensure VF function number does not overflow"
Revert "pcie_sriov: Reuse SR-IOV VF device instances"
Revert "pcie_sriov: Release VFs failed to realize"
Revert "pcie_sriov: Remove num_vfs from PCIESriovPF"
Revert "pcie_sriov: Register VFs after migration"
Revert "hw/pci: Fix SR-IOV VF number calculation"
Revert "pcie_sriov: Ensure PF and VF are mutually exclusive"
Revert "pcie_sriov: Check PCI Express for SR-IOV PF"
Revert "pcie_sriov: Allow user to create SR-IOV device"
Revert "virtio-pci: Implement SR-IOV PF"
Revert "virtio-net: Implement SR-IOV VF"
Revert "docs: Document composable SR-IOV device"
virtio-rng: block max-bytes=0
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
In commit ad18376b90 we added an assert that the level value was
in-bounds for the array we're about to index into. However, the
assert condition is wrong -- env->config->interrupt_vector is an
array of uint32_t, so we should bounds check the index against
ARRAY_SIZE(...), not against sizeof().
Resolves: Coverity CID 1507131
Fixes: ad18376b90 ("target/xtensa: Assert that interrupt level is within bounds")
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Acked-by: Max Filippov <jcmvbkbc@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20240731172246.3682311-1-peter.maydell@linaro.org
The FMOPA (widening) SME instruction takes pairs of half-precision
floating point values, widens them to single-precision, does a
two-way dot product and accumulates the results into a
single-precision destination. We don't quite correctly handle the
FPCR bits FZ and FZ16 which control flushing of denormal inputs and
outputs. This is because at the moment we pass a single float_status
value to the helper function, which then uses that configuration for
all the fp operations it does. However, because the inputs to this
operation are float16 and the outputs are float32 we need to use the
fp_status_f16 for the float16 input widening but the normal fp_status
for everything else. Otherwise we will apply the flushing control
FPCR.FZ16 to the 32-bit output rather than the FPCR.FZ control, and
incorrectly flush a denormal output to zero when we should not (or
vice-versa).
(In commit 207d30b5fd we tried to fix the FZ handling but
didn't get it right, switching from "use FPCR.FZ for everything" to
"use FPCR.FZ16 for everything".)
Pass the CPU env to the sme_fmopa_h helper instead of an fp_status
pointer, and have the helper pass an extra fp_status into the
f16_dotadd() function so that we can use the right status for the
right parts of this operation.
Cc: qemu-stable@nongnu.org
Fixes: 207d30b5fd ("target/arm: Use FPST_F16 for SME FMOPA (widening)")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2373
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
If VT-D hardware supports scalable mode, Linux will set the IQA DW field
(bit11). In qemu, the vtd_mem_write and vtd_update_iq_dw set DW field well.
However, vtd_mem_read the DW field wrong because "& VTD_IQA_QS" dropped the
value of DW.
Replace "&VTD_IQA_QS" with "& (VTD_IQA_QS | VTD_IQA_DW_MASK)" could save
the DW field.
Test patch as below:
config the "x-scalable-mode" option:
"-device intel-iommu,caching-mode=on,x-scalable-mode=on,aw-bits=48"
After Linux OS boot, check the IQA_REG DW Field by usage 1 or 2:
1. IOMMU_DEBUGFS:
Before fix:
cat /sys/kernel/debug/iommu/intel/iommu_regset |grep IQA
IQA 0x90 0x00000001001da001
After fix:
cat /sys/kernel/debug/iommu/intel/iommu_regset |grep IQA
IQA 0x90 0x00000001001da801
Check DW field(bit11) is 1.
2. devmem2 read the IQA_REG (offset 0x90):
Before fix:
devmem2 0xfed90090
/dev/mem opened.
Memory mapped at address 0x7f72c795b000.
Value at address 0xFED90090 (0x7f72c795b090): 0x1DA001
After fix:
devmem2 0xfed90090
/dev/mem opened.
Memory mapped at address 0x7fc95281c000.
Value at address 0xFED90090 (0x7fc95281c090): 0x1DA801
Check DW field(bit11) is 1.
Signed-off-by: yeeli <seven.yi.lee@gmail.com>
Message-Id: <20240725031858.1529902-1-seven.yi.lee@gmail.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
In amdvi_update_iotlb() we will only put a new entry in the hash
table if to_cache.perm is not IOMMU_NONE. However we allocate the
memory for the new AMDVIIOTLBEntry and for the hash table key
regardless. This means that in the IOMMU_NONE case we will leak the
memory we alloacted.
Move the allocations into the if() to the point where we know we're
going to add the item to the hash table.
Cc: qemu-stable@nongnu.org
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2452
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20240731170019.3590563-1-peter.maydell@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
with max-bytes set to 0, quota is 0 and so device does not work.
block this to avoid user confusion
Message-Id: <73a89a42d82ec8b47358f25119b87063e4a6ea57.1721818306.git.mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Similar to qemu-pr-helper, do not print errors from the socket handling loop
unless a --verbose or -v option is provided explicitly on the command line.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Between v5 and v6 of the series, the socket loop of qemu-vmsr-helper was changed to
allow sending multiple requests on the same socket. Unfortunately, the condition
of the while loop is botched and the loop will never be entered. Clean it up, and
also unify the handling of error reporting.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Fix leaking memory of file handle in case of error
Erase unused "pid = -1"
Add clearer error_report
Should fix Coverity CID 1558557.
Signed-off-by: Anthony Harivel <aharivel@redhat.com>
Link: https://lore.kernel.org/r/20240726102632.1324432-3-aharivel@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
As SDM stated, CPUID 0x12 leaves depend on CPUID_7_0_EBX_SGX (SGX
feature word).
Since FEAT_SGX_12_0_EAX, FEAT_SGX_12_0_EBX and FEAT_SGX_12_1_EAX define
multiple feature words, add the dependencies of those registers to
report the warning to user if SGX is absent.
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20240730045544.2516284-4-zhao1.liu@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
At present, cpu_x86_cpuid() silently masks off SGX_LC if SGX is absent.
This is not proper because the user is not told about the dependency
between the two.
So explicitly define the dependency between SGX_LC and SGX feature
words, so that user could get a warning when SGX_LC is enabled but
SGX is absent.
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20240730045544.2516284-3-zhao1.liu@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
CPUID.0x7.0.ebx and CPUID.0x7.0.ecx leaves have been expressed as the
feature word lists, and the Host capability support has been checked
in x86_cpu_filter_features().
Therefore, such checks on SGX feature "words" are redundant, and
the follow-up adjustments to those feature "words" will not actually
take effect.
Remove unnecessary SGX feature words related checks.
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20240730045544.2516284-2-zhao1.liu@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
The feature word 'r' is a u64, and "unavail" is a u32, the operation
'r &= ~unavail' clears the high 32 bits of 'r'. This causes many vmx cases
in kvm-unit-tests to fail. Changing 'unavail' from u32 to u64 fixes this
issue.
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2442
Fixes: 0b2757412c ("target/i386: drop AMD machine check bits from Intel CPUID")
Signed-off-by: Xiong Zhang <xiong.y.zhang@linux.intel.com>
Link: https://lore.kernel.org/r/20240730082927.250180-1-xiong.y.zhang@linux.intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
- display packages in CI builds to catch changes
- stop compiler complaining about exec stacks in test cases
- stop loongarch compiler complaining about rwx in test cases
- improve docs on running TCG tests
- remove old unneeded avocado test for memory callback testing
- move test plugins into tcg testing dir
- clean-up and move plugin documentation to emulation section
- remove dead code from cache modelling plugin
- add compatibility workaround for lockstep plugin
- make some noise when building contrib plugins
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Merge tag 'pull-maintainer-9.1-rc1-300724-1' of https://gitlab.com/stsquad/qemu into staging
Minor bug fixes and documentation cleanups:
- display packages in CI builds to catch changes
- stop compiler complaining about exec stacks in test cases
- stop loongarch compiler complaining about rwx in test cases
- improve docs on running TCG tests
- remove old unneeded avocado test for memory callback testing
- move test plugins into tcg testing dir
- clean-up and move plugin documentation to emulation section
- remove dead code from cache modelling plugin
- add compatibility workaround for lockstep plugin
- make some noise when building contrib plugins
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# gpg: Signature made Tue 30 Jul 2024 08:54:36 PM AEST
# gpg: using RSA key 6685AE99E75167BCAFC8DF35FBD0DB095A9E2A44
# gpg: Good signature from "Alex Bennée (Master Work Key) <alex.bennee@linaro.org>" [full]
* tag 'pull-maintainer-9.1-rc1-300724-1' of https://gitlab.com/stsquad/qemu:
plugin/loader: handle basic help query
contrib/plugins: add compat for g_memdup2
contrib/plugins: be more vocal building
contrib/plugins/cache.c: Remove redundant check of l2_access
docs: split TCG plugin usage from devel section
tests/tcg: move test plugins into tcg subdir
tests/avocado: remove tcg_plugins virt_mem_icount test
docs/devel: document how to run individual TCG tests
docs/devel: update the testing introduction
tests/tcg: update README
tests/tcg/loongarch64: Use --no-warn-rwx-segments to link system tests
tests/tcg: Use --noexecstack with assembler files
gitlab: display /packages.txt in build jobs
gitlab: record installed packages in /packages.txt in containers
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
