Data sizes in VFIO migration trace events are printed in hex format
while in migration core trace events they are printed in decimal format.
This inconsistency makes it less readable when using both trace event
types. Hence, change the data sizes print format to decimal in VFIO
migration trace events.
Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
vfio_state_pending_exact() is used to update migration core how much
device data is left for the device migration. Currently, the sum of
pre-copy and stop-copy sizes of the VFIO device are reported.
The pre-copy size is obtained via the VFIO_MIG_GET_PRECOPY_INFO ioctl,
which returns the amount of device data available to be transferred
while the device is in the PRE_COPY states.
The stop-copy size is obtained via the VFIO_DEVICE_FEATURE_MIG_DATA_SIZE
ioctl, which returns the total amount of device data left to be
transferred in order to complete the device migration.
According to the above, current implementation is wrong -- it reports
extra overlapping data because pre-copy size is already contained in
stop-copy size. Fix it by reporting only stop-copy size.
Fixes: eda7362af9 ("vfio/migration: Add VFIO migration pre-copy support")
Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
* Update the OpenBSD CI image to OpenBSD v7.6
* Bump timeout of the ide-test
* New maintainer for the QTests
* Disable the pci-bridge on s390x by default
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Merge tag 'pull-request-2024-10-21' of https://gitlab.com/thuth/qemu into staging
* Convert most Tuxrun Avocado tests to the new functional framework
* Update the OpenBSD CI image to OpenBSD v7.6
* Bump timeout of the ide-test
* New maintainer for the QTests
* Disable the pci-bridge on s390x by default
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# gpg: Signature made Mon 21 Oct 2024 17:07:04 BST
# gpg: using RSA key 27B88847EEE0250118F3EAB92ED9D774FE702DB5
# gpg: issuer "thuth@redhat.com"
# gpg: Good signature from "Thomas Huth <th.huth@gmx.de>" [full]
# gpg: aka "Thomas Huth <thuth@redhat.com>" [full]
# gpg: aka "Thomas Huth <huth@tuxfamily.org>" [full]
# gpg: aka "Thomas Huth <th.huth@posteo.de>" [unknown]
# Primary key fingerprint: 27B8 8847 EEE0 2501 18F3 EAB9 2ED9 D774 FE70 2DB5
* tag 'pull-request-2024-10-21' of https://gitlab.com/thuth/qemu:
tests/functional: Convert the Avocado sh4 tuxrun test
Revert "hw/sh4/r2d: Realize IDE controller before accessing it"
tests/functional: Convert the Avocado ppc32 tuxrun test
tests/functional: Convert the Avocado mips64el tuxrun test
tests/functional: Convert the Avocado mips64 tuxrun test
tests/functional: Convert the Avocado mipsel tuxrun test
tests/functional: Convert the Avocado mips tuxrun test
tests/functional: Convert the Avocado x86_64 tuxrun test
tests/functional: Convert the Avocado i386 tuxrun test
tests/functional: Convert the Avocado riscv64 tuxrun tests
tests/functional: Convert the Avocado riscv32 tuxrun tests
tests/functional: Convert the Avocado arm tuxrun tests
tests/functional: Convert the Avocado s390x tuxrun test
tests/functional: Convert the Avocado sparc64 tuxrun test
tests/functional: Convert the Avocado ppc64 tuxrun tests
tests/functional: Add a base class for the TuxRun tests
hw/pci-bridge: Add a Kconfig switch for the normal PCI bridge
MAINTAINERS: A new maintainer for the qtests
tests/qtest: Raise the ide-test timeout
tests/vm: update openbsd image to 7.6
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Move the test into a new file so that it can be run via
qemu-system-sh4 in the functional framework.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20241011131937.377223-18-thuth@redhat.com>
This reverts commit 3c5f86a226.
Changing the order here caused a regression with the "tuxrun"
kernels (from https://storage.tuxboot.com/20230331/) - ATA commands
fail with a "ata1: lost interrupt (Status 0x58)" message.
Apparently we need to wire the interrupt here first before
realizing the device, so revert the change to the original
behavior.
Reported-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20241011131937.377223-17-thuth@redhat.com>
Move the test into a new file so that it can be run via
qemu-system-ppc in the functional framework.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20241011131937.377223-16-thuth@redhat.com>
Move the test into a new file so that it can be run via
qemu-system-mips64el in the functional framework.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20241011131937.377223-15-thuth@redhat.com>
Move the test into a new file so that it can be run via
qemu-system-mips64 in the functional framework.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20241011131937.377223-14-thuth@redhat.com>
Move the test into a new file so that it can be run via
qemu-system-mipsel in the functional framework.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20241011131937.377223-13-thuth@redhat.com>
Move the test into a new file so that it can be run via
qemu-system-mips in the functional framework.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20241011131937.377223-12-thuth@redhat.com>
Move the tests to a new file so that they can be run via
qemu-system-x86_64 in the functional framework.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20241011131937.377223-11-thuth@redhat.com>
Move the tests to a new file so that they can be run via
qemu-system-i386 in the functional framework.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20241011131937.377223-10-thuth@redhat.com>
Move the tests to a new file so that they can be run via
qemu-system-riscv64 in the functional framework.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20241011131937.377223-9-thuth@redhat.com>
Move the tests to a new file so that they can be run via
qemu-system-riscv32 in the functional framework.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20241011131937.377223-8-thuth@redhat.com>
Move the tests to a new file so that they can be run via
qemu-system-arm in the functional framework.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20241011131937.377223-7-thuth@redhat.com>
Move the test to a new file so that it can be run via
qemu-system-s390x in the functional framework.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20241011131937.377223-6-thuth@redhat.com>
Move the test to a new file so that it can be run via
qemu-system-sparc64 in the functional framework.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20241011131937.377223-5-thuth@redhat.com>
Move the tests to a new file so that they can be run via
qemu-system-ppc64 in the functional framework.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20241011131937.377223-3-thuth@redhat.com>
Add a base class for the TuxRun tests, based on the code from
tests/avocado/tuxrun_baselines.py (the test have to be put into
separate file in the following commits, depending on the target
architecture that gets tested).
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20241011131937.377223-2-thuth@redhat.com>
The pci-bridge device is not usable on s390x, so introduce a Kconfig
switch that allows to disable it.
Message-ID: <20240913144844.427899-1-thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Since I blundered into becoming the maintainer of the new functional
test framework in QEMU (tests/functional/) recently, I need to drop
some other duties - it's getting too much for me otherwise. Laurent
is also quite busy with other projects nowadays, so I looked around
for help.
Fabiano did quite a lot of work in the qtests in the past already,
and is also already a maintainer for migration, so I thought he
would be a very good fit, thus I asked him whether he would be
interested to help out with the qtests and he agreed.
Thank you very much, Fabiano!
Message-ID: <20241011141344.379781-1-thuth@redhat.com>
Acked-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Thomas Huth <thuth@redhat.com>
The ide-test occasionally times out: on the system I run
vm-build-openbsd on, it usually takes about 18 seconds, but
occasionally hits the 60s timeout, likely when the host machine is
under heavy load. I have also seen this test hit its time limit on
the s390x CI runner.
Double the timeout for this test so that it won't hit its timeout
even when the host is running more slowly than usual.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20241015113705.239067-1-peter.maydell@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Remove tomli as Python has been updated to 3.11.
[thuth: The "Time appears wrong" line is now necessary since the server
seems to provide a wrong timestamp. We likely have to remove that again
later once the server is running with the correct time again]
Signed-off-by: Brad Smith <brad@comstyle.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Tested-by: Thomas Huth <thuth@redhat.com>
Message-ID: <ZwtmfVlWgFRF9G8W@humpty.home.comstyle.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Avoid use of uninitialized bufioreq_evtchn. It should only
be used if buffered IOREQs are enabled.
Resolves: Coverity CID 1563383
Reported-by: Peter Maydell <peter.maydell@linaro.org>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@amd.com>
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Merge tag 'pull-tpm-2024-10-18-1' of https://github.com/stefanberger/qemu-tpm into staging
Merge tpm 2024/10/18 v1
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# gpg: Signature made Fri 18 Oct 2024 14:12:14 BST
# gpg: using RSA key B818B9CADF9089C2D5CEC66B75AD65802A0B4211
# gpg: Good signature from "Stefan Berger <stefanb@linux.vnet.ibm.com>" [unknown]
# 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: B818 B9CA DF90 89C2 D5CE C66B 75AD 6580 2A0B 4211
* tag 'pull-tpm-2024-10-18-1' of https://github.com/stefanberger/qemu-tpm:
tests: Wait for migration completion on destination QEMU to avoid failures
tpm_emulator: Read control channel response in 2 passes
tpm: Use new ptm_cap_n structure for PTM_GET_CAPABILITY
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20241010150144.986655-8-armbru@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
The error message doesn't matter much, as the "openpic" device isn't
user-creatable. But it's the last use of
QERR_PROPERTY_VALUE_OUT_OF_RANGE, which has to go. Change the message
just like the previous commit did for x86 CPUs.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20241010150144.986655-7-armbru@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
The error message for a "stepping" value that is out of bounds is a
bit odd:
$ qemu-system-x86_64 -cpu qemu64,stepping=16
qemu-system-x86_64: can't apply global qemu64-x86_64-cpu.stepping=16: Property .stepping doesn't take value 16 (minimum: 0, maximum: 15)
The "can't apply global" part is an unfortunate artifact of -cpu's
implementation. Left for another day.
The remainder feels overly verbose. Change it to
qemu64-x86_64-cpu: can't apply global qemu64-x86_64-cpu.stepping=16: parameter 'stepping' can be at most 15
Likewise for "family", "model", and "tsc-frequency".
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20241010150144.986655-6-armbru@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Properties "family", "model", and "stepping" are visited as signed
integers. They are backed by bits in CPUX86State member
@cpuid_version. The code to extract and insert these bits mixes
signed and unsigned. Not actually wrong, but avoiding such mixing is
good practice.
Visit them as unsigned integers instead.
This adds a few mildly ugly cast in arguments of error_setg(). The
next commit will get rid of them again.
Property "tsc-frequency" is also visited as signed integer. The value
ultimately flows into the kernel, where it is 31 bits unsigned. The
QEMU code freely mixes int, uint32_t, int64_t. I elect not to attempt
draining this swamp today.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20241010150144.986655-5-armbru@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Parameter @id is no longer used, drop. Return a bool to indicate
success / failure, as recommended by qapi/error.h.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20241010150144.986655-4-armbru@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Block sizes need to be a power of two between 512 and an arbitrary
limit, currently 2MiB.
Commit 5937835ac4 factored block size checking out of set_blocksize()
into new check_block_size(), for reuse in block/export/.
Its two error messages are okay for the original purpose:
$ qemu-system-x86_64 -device ide-hd,physical_block_size=1
qemu-system-x86_64: -device ide-hd,physical_block_size=1: Property .physical_block_size doesn't take value 1 (minimum: 512, maximum: 2097152)
$ qemu-system-x86_64 -device ide-hd,physical_block_size=513
qemu-system-x86_64: -device ide-hd,physical_block_size=513: Property .physical_block_size doesn't take value '513', it's not a power of 2
They're mildly off for block exports:
$ qemu-storage-daemon --blockdev node-name=nod0,driver=file,filename=foo.img --export type=vduse-blk,id=exp0,node-name=nod0,name=foo,logical-block-size=1
qemu-storage-daemon: --export type=vduse-blk,id=exp0,node-name=nod0,name=foo,logical-block-size=1: Property exp0.logical-block-size doesn't take value 1 (minimum: 512, maximum: 2097152)
The error message talks about a property. CLI options like --export
don't have properties, they have parameters.
Replace the two error messages by a single one that's okay for both
purposes. Looks like this:
qemu-storage-daemon: --export type=vduse-blk,id=exp0,node-name=nod0,name=foo,logical-block-size=1: parameter logical-block-size must be a power of 2 between 512 and 2097152
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20241010150144.986655-3-armbru@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20241010150144.986655-2-armbru@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
The Windows version of guest-set-user-password rejects argument
"crypted": true with the rather useless "this feature or command is
not currently supported". Improve to "'crypted' must be off on this
host".
QERR_UNSUPPORTED is now unused. Drop.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240911131206.2503035-3-armbru@redhat.com>
The note talks about "unsupported" errors and QERR_UNSUPPORTED. The
former is vague, and the latter makes sense only in C, not in external
interface documentation. Fortunately, we don't have to address this
anymore: recent merge commit 3b5efc553e got rid of these errors.
Delete the note.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240911131206.2503035-2-armbru@redhat.com>
Rather than waiting for the completion of migration on the source side,
wait for it on the destination QEMU side to avoid accessing the TPM TIS
memory mapped registers before QEMU could restore their state. This
error condition could be triggered on busy systems where the destination
QEMU did not have enough time to restore the TIS state while the test case
was already reading its registers. The test case was for example reading
the STS register and received an unexpected value (0xffffffff), which
lead to a segmentation fault later on due to trying to read 0xffff bytes
from the TIS into a buffer.
Cc: <qemu-stable@nongnu.org>
Reported-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Error responses from swtpm are typically only 4 bytes long with the
exception of a few commands that return more bytes. Therefore, read the
entire response in 2 steps and stop if the first few bytes indicate an
error response with no subsequent bytes readable. Read the rest in a 2nd
step, if needed. This avoids getting stuck while waiting for too many
bytes in case of an error. The 'getting stuck' condition has not been
observed in practice so far, though.
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2615
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Use the new ptm_cap_n structure for getting the PTM_GET_CAPABILITY response
from swtpm. Previously only 17 bits could possibly have been set in ptm_cap
(uint64_t) in big endian order and those bits are now found in the 2nd
32bit word in the response in the caps field.
This data structure makes it now clear that the 1st 32bit word carries the
tpm_result like all the other response structures of all other commands
do.
The changes are taken from the swtpm project's tpm_ioctl.h.
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
* target/i386: Fixes for IN and OUT with REX prefix
* target/i386: New CPUID features and logic fixes
* target/i386: Add support save/load HWCR MSR
* target/i386: Move more instructions to new decoder; separate decoding
and IR generation
* target/i386/tcg: Use DPL-level accesses for interrupts and call gates
* accel/kvm: perform capability checks on VM file descriptor when necessary
* accel/kvm: dynamically sized kvm memslots array
* target/i386: fixes for Hyper-V
* docs/system: Add recommendations to Hyper-V enlightenments doc
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Merge tag 'for-upstream' of https://gitlab.com/bonzini/qemu into staging
* tcg/s390x: Fix for TSTEQ/TSTNE
* target/i386: Fixes for IN and OUT with REX prefix
* target/i386: New CPUID features and logic fixes
* target/i386: Add support save/load HWCR MSR
* target/i386: Move more instructions to new decoder; separate decoding
and IR generation
* target/i386/tcg: Use DPL-level accesses for interrupts and call gates
* accel/kvm: perform capability checks on VM file descriptor when necessary
* accel/kvm: dynamically sized kvm memslots array
* target/i386: fixes for Hyper-V
* docs/system: Add recommendations to Hyper-V enlightenments doc
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# gpg: Signature made Thu 17 Oct 2024 18:42:34 BST
# gpg: using RSA key F13338574B662389866C7682BFFBD25F78C7AE83
# gpg: issuer "pbonzini@redhat.com"
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" [full]
# gpg: aka "Paolo Bonzini <pbonzini@redhat.com>" [full]
# Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4 E2F7 7E15 100C CD36 69B1
# Subkey fingerprint: F133 3857 4B66 2389 866C 7682 BFFB D25F 78C7 AE83
* tag 'for-upstream' of https://gitlab.com/bonzini/qemu: (26 commits)
target/i386: Use only 16 and 32-bit operands for IN/OUT
accel/kvm: check for KVM_CAP_MEMORY_ATTRIBUTES on vm
accel/kvm: check for KVM_CAP_MULTI_ADDRESS_SPACE on vm
accel/kvm: check for KVM_CAP_READONLY_MEM on VM
target/i386/tcg: Use DPL-level accesses for interrupts and call gates
KVM: Rename KVMState->nr_slots to nr_slots_max
KVM: Rename KVMMemoryListener.nr_used_slots to nr_slots_used
KVM: Define KVM_MEMSLOTS_NUM_MAX_DEFAULT
KVM: Dynamic sized kvm memslots array
target/i386: assert that cc_op* and pc_save are preserved
target/i386: list instructions still in translate.c
target/i386: do not check PREFIX_LOCK in old-style decoder
target/i386: convert CMPXCHG8B/CMPXCHG16B to new decoder
target/i386: decode address before going back to translate.c
target/i386: convert bit test instructions to new decoder
tcg/s390x: fix constraint for 32-bit TSTEQ/TSTNE
docs/system: Add recommendations to Hyper-V enlightenments doc
target/i386: Make sure SynIC state is really updated before KVM_RUN
target/i386: Exclude 'hv-syndbg' from 'hv-passthrough'
target/i386: Fix conditional CONFIG_SYNDBG enablement
...
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
The exact set of available memory attributes can vary by VM. In the
future it might vary depending on enabled capabilities, too. Query the
extension on the VM level instead of on the KVM level, and only after
architecture-specific initialization.
Inspired by an analogous patch by Tom Dohrmann.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
KVM_CAP_MULTI_ADDRESS_SPACE used to be a global capability, but with the
introduction of AMD SEV-SNP confidential VMs, the number of address spaces
can vary by VM type.
Query the extension on the VM level instead of on the KVM level.
Inspired by an analogous patch by Tom Dohrmann.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Stack accesses should be explicit and use the privilege level of the
target stack. This ensures that SMAP is not applied when the target
stack is in ring 3.
This fixes a bug wherein i386/tcg assumed that an interrupt return, or a
far call using the CALL or JMP instruction, was always going from kernel
or user mode to kernel mode when using a call gate. This assumption is
violated if the call gate has a DPL that is greater than 0.
Analyzed-by: Robert R. Henry <rrh.henry@gmail.com>
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/249
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This value used to reflect the maximum supported memslots from KVM kernel.
Rename it to be clearer.
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Link: https://lore.kernel.org/r/20240917163835.194664-5-peterx@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This will make all nr_slots counters to be named in the same manner.
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Link: https://lore.kernel.org/r/20240917163835.194664-4-peterx@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Make the default max nr_slots a macro, it's only used when KVM reports
nothing.
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Link: https://lore.kernel.org/r/20240917163835.194664-3-peterx@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Zhiyi reported an infinite loop issue in VFIO use case. The cause of that
was a separate discussion, however during that I found a regression of
dirty sync slowness when profiling.
Each KVMMemoryListerner maintains an array of kvm memslots. Currently it's
statically allocated to be the max supported by the kernel. However after
Linux commit 4fc096a99e ("KVM: Raise the maximum number of user memslots"),
the max supported memslots reported now grows to some number large enough
so that it may not be wise to always statically allocate with the max
reported.
What's worse, QEMU kvm code still walks all the allocated memslots entries
to do any form of lookups. It can drastically slow down all memslot
operations because each of such loop can run over 32K times on the new
kernels.
Fix this issue by making the memslots to be allocated dynamically.
Here the initial size was set to 16 because it should cover the basic VM
usages, so that the hope is the majority VM use case may not even need to
grow at all (e.g. if one starts a VM with ./qemu-system-x86_64 by default
it'll consume 9 memslots), however not too large to waste memory.
There can also be even better way to address this, but so far this is the
simplest and should be already better even than before we grow the max
supported memslots. For example, in the case of above issue when VFIO was
attached on a 32GB system, there are only ~10 memslots used. So it could
be good enough as of now.
In the above VFIO context, measurement shows that the precopy dirty sync
shrinked from ~86ms to ~3ms after this patch applied. It should also apply
to any KVM enabled VM even without VFIO.
NOTE: we don't have a FIXES tag for this patch because there's no real
commit that regressed this in QEMU. Such behavior existed for a long time,
but only start to be a problem when the kernel reports very large
nr_slots_max value. However that's pretty common now (the kernel change
was merged in 2021) so we attached cc:stable because we'll want this change
to be backported to stable branches.
Cc: qemu-stable <qemu-stable@nongnu.org>
Reported-by: Zhiyi Guo <zhguo@redhat.com>
Tested-by: Zhiyi Guo <zhguo@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/r/20240917163835.194664-2-peterx@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Now all decoding has been done before any code generation.
There is no need anymore to save and restore cc_op* and
pc_save but, for the time being, assert that this is indeed
the case.
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
