Merge tag 'for_upstream' of git://git.kernel.org/pub/scm/virt/kvm/mst/qemu into staging
virtio,pc,pci: fixes,cleanups,features
most of CXL support
fixes, cleanups all over the place
Signed-off-by: Michael S. Tsirkin <[email protected]>
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# gpg: Signature made Mon 16 May 2022 01:48:50 PM PDT
# gpg: using RSA key 5D09FD0871C8F85B94CA8A0D281F0DB8D28D5469
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# gpg: Good signature from "Michael S. Tsirkin <[email protected]>" [undefined]
# gpg: aka "Michael S. Tsirkin <[email protected]>" [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: 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 git://git.kernel.org/pub/scm/virt/kvm/mst/qemu: (86 commits)
vhost-user-scsi: avoid unlink(NULL) with fd passing
virtio-net: don't handle mq request in userspace handler for vhost-vdpa
vhost-vdpa: change name and polarity for vhost_vdpa_one_time_request()
vhost-vdpa: backend feature should set only once
vhost-net: fix improper cleanup in vhost_net_start
vhost-vdpa: fix improper cleanup in net_init_vhost_vdpa
virtio-net: align ctrl_vq index for non-mq guest for vhost_vdpa
virtio-net: setup vhost_dev and notifiers for cvq only when feature is negotiated
hw/i386/amd_iommu: Fix IOMMU event log encoding errors
hw/i386: Make pic a property of common x86 base machine type
hw/i386: Make pit a property of common x86 base machine type
include/hw/pci/pcie_host: Correct PCIE_MMCFG_SIZE_MAX
include/hw/pci/pcie_host: Correct PCIE_MMCFG_BUS_MASK
docs/vhost-user: Clarifications for VHOST_USER_ADD/REM_MEM_REG
vhost-user: more master/slave things
virtio: add vhost support for virtio devices
virtio: drop name parameter for virtio_init()
virtio/vhost-user: dynamically assign VhostUserHostNotifiers
hw/virtio/vhost-user: don't suppress F_CONFIG when supported
include/hw: start documenting the vhost API
...
Merge tag 'for-upstream' of https://gitlab.com/bonzini/qemu into staging
* fix WHPX debugging
* misc qga-vss fixes
* remove the deprecated CPU model 'Icelake-Client'
* support for x86 architectural LBR
* remove deprecated properties
* replace deprecated -soundhw with -audio
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# gpg: Signature made Sat 14 May 2022 03:34:06 AM PDT
# gpg: using RSA key F13338574B662389866C7682BFFBD25F78C7AE83
# gpg: issuer "[email protected]"
# gpg: Good signature from "Paolo Bonzini <[email protected]>" [undefined]
# gpg: aka "Paolo Bonzini <[email protected]>" [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: 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: (23 commits)
configure: remove duplicate help messages
configure: remove another dead variable
build: remove useless dependency
introduce -audio as a replacement for -soundhw
soundhw: move help handling to vl.c
soundhw: unify initialization for ISA and PCI soundhw
soundhw: extract soundhw help to a separate function
soundhw: remove ability to create multiple soundcards
rng: make opened property read-only
crypto: make loaded property read-only
target/i386: Support Arch LBR in CPUID enumeration
target/i386: introduce helper to access supported CPUID
target/i386: Enable Arch LBR migration states in vmstate
target/i386: Add MSR access interface for Arch LBR
target/i386: Add XSAVES support for Arch LBR
target/i386: Enable support for XSAVES based features
target/i386: Add kvm_get_one_msr helper
target/i386: Add lbr-fmt vPMU option to support guest LBR
qdev-properties: Add a new macro with bitmask check for uint64_t property
i386/cpu: Remove the deprecated cpu model 'Icelake-Client'
...
Stefan Hajnoczi [Mon, 16 May 2022 15:57:01 +0000 (16:57 +0100)]
vhost-user-scsi: avoid unlink(NULL) with fd passing
Commit 747421e949fc1eb3ba66b5fcccdb7ba051918241 ("Implements Backend
Program conventions for vhost-user-scsi") introduced fd-passing support
as part of implementing the vhost-user backend program conventions.
When fd passing is used the UNIX domain socket path is NULL and we must
not call unlink(2).
The unlink(2) call is necessary when the listen socket, lsock, was
created successfully since that means the UNIX domain socket is visible
in the file system.
Si-Wei Liu [Sat, 7 May 2022 02:28:18 +0000 (19:28 -0700)]
virtio-net: don't handle mq request in userspace handler for vhost-vdpa
virtio_queue_host_notifier_read() tends to read pending event
left behind on ioeventfd in the vhost_net_stop() path, and
attempts to handle outstanding kicks from userspace vq handler.
However, in the ctrl_vq handler, virtio_net_handle_mq() has a
recursive call into virtio_net_set_status(), which may lead to
segmentation fault as shown in below stack trace:
0 0x000055f800df1780 in qdev_get_parent_bus (dev=0x0) at ../hw/core/qdev.c:376
1 0x000055f800c68ad8 in virtio_bus_device_iommu_enabled (vdev=vdev@entry=0x0) at ../hw/virtio/virtio-bus.c:331
2 0x000055f800d70d7f in vhost_memory_unmap (dev=<optimized out>) at ../hw/virtio/vhost.c:318
3 0x000055f800d70d7f in vhost_memory_unmap (dev=<optimized out>, buffer=0x7fc19bec5240, len=2052, is_write=1, access_len=2052) at ../hw/virtio/vhost.c:336
4 0x000055f800d71867 in vhost_virtqueue_stop (dev=dev@entry=0x55f8037ccc30, vdev=vdev@entry=0x55f8044ec590, vq=0x55f8037cceb0, idx=0) at ../hw/virtio/vhost.c:1241
5 0x000055f800d7406c in vhost_dev_stop (hdev=hdev@entry=0x55f8037ccc30, vdev=vdev@entry=0x55f8044ec590) at ../hw/virtio/vhost.c:1839
6 0x000055f800bf00a7 in vhost_net_stop_one (net=0x55f8037ccc30, dev=0x55f8044ec590) at ../hw/net/vhost_net.c:315
7 0x000055f800bf0678 in vhost_net_stop (dev=dev@entry=0x55f8044ec590, ncs=0x55f80452bae0, data_queue_pairs=data_queue_pairs@entry=7, cvq=cvq@entry=1)
at ../hw/net/vhost_net.c:423
8 0x000055f800d4e628 in virtio_net_set_status (status=<optimized out>, n=0x55f8044ec590) at ../hw/net/virtio-net.c:296
9 0x000055f800d4e628 in virtio_net_set_status (vdev=vdev@entry=0x55f8044ec590, status=15 '\017') at ../hw/net/virtio-net.c:370
10 0x000055f800d534d8 in virtio_net_handle_ctrl (iov_cnt=<optimized out>, iov=<optimized out>, cmd=0 '\000', n=0x55f8044ec590) at ../hw/net/virtio-net.c:1408
11 0x000055f800d534d8 in virtio_net_handle_ctrl (vdev=0x55f8044ec590, vq=0x7fc1a7e888d0) at ../hw/net/virtio-net.c:1452
12 0x000055f800d69f37 in virtio_queue_host_notifier_read (vq=0x7fc1a7e888d0) at ../hw/virtio/virtio.c:2331
13 0x000055f800d69f37 in virtio_queue_host_notifier_read (n=n@entry=0x7fc1a7e8894c) at ../hw/virtio/virtio.c:3575
14 0x000055f800c688e6 in virtio_bus_cleanup_host_notifier (bus=<optimized out>, n=n@entry=14) at ../hw/virtio/virtio-bus.c:312
15 0x000055f800d73106 in vhost_dev_disable_notifiers (hdev=hdev@entry=0x55f8035b51b0, vdev=vdev@entry=0x55f8044ec590)
at ../../../include/hw/virtio/virtio-bus.h:35
16 0x000055f800bf00b2 in vhost_net_stop_one (net=0x55f8035b51b0, dev=0x55f8044ec590) at ../hw/net/vhost_net.c:316
17 0x000055f800bf0678 in vhost_net_stop (dev=dev@entry=0x55f8044ec590, ncs=0x55f80452bae0, data_queue_pairs=data_queue_pairs@entry=7, cvq=cvq@entry=1)
at ../hw/net/vhost_net.c:423
18 0x000055f800d4e628 in virtio_net_set_status (status=<optimized out>, n=0x55f8044ec590) at ../hw/net/virtio-net.c:296
19 0x000055f800d4e628 in virtio_net_set_status (vdev=0x55f8044ec590, status=15 '\017') at ../hw/net/virtio-net.c:370
20 0x000055f800d6c4b2 in virtio_set_status (vdev=0x55f8044ec590, val=<optimized out>) at ../hw/virtio/virtio.c:1945
21 0x000055f800d11d9d in vm_state_notify (running=running@entry=false, state=state@entry=RUN_STATE_SHUTDOWN) at ../softmmu/runstate.c:333
22 0x000055f800d04e7a in do_vm_stop (state=state@entry=RUN_STATE_SHUTDOWN, send_stop=send_stop@entry=false) at ../softmmu/cpus.c:262
23 0x000055f800d04e99 in vm_shutdown () at ../softmmu/cpus.c:280
24 0x000055f800d126af in qemu_cleanup () at ../softmmu/runstate.c:812
25 0x000055f800ad5b13 in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at ../softmmu/main.c:51
For now, temporarily disable handling MQ request from the ctrl_vq
userspace hanlder to avoid the recursive virtio_net_set_status()
call. Some rework is needed to allow changing the number of
queues without going through a full virtio_net_set_status cycle,
particularly for vhost-vdpa backend.
This patch will need to be reverted as soon as future patches of
having the change of #queues handled in userspace is merged.
Si-Wei Liu [Sat, 7 May 2022 02:28:17 +0000 (19:28 -0700)]
vhost-vdpa: change name and polarity for vhost_vdpa_one_time_request()
The name vhost_vdpa_one_time_request() was confusing. No
matter whatever it returns, its typical occurrence had
always been at requests that only need to be applied once.
And the name didn't suggest what it actually checks for.
Change it to vhost_vdpa_first_dev() with polarity flipped
for better readibility of code. That way it is able to
reflect what the check is really about.
This call is applicable to request which performs operation
only once, before queues are set up, and usually at the beginning
of the caller function. Document the requirement for it in place.
Si-Wei Liu [Sat, 7 May 2022 02:28:16 +0000 (19:28 -0700)]
vhost-vdpa: backend feature should set only once
The vhost_vdpa_one_time_request() branch in
vhost_vdpa_set_backend_cap() incorrectly sends down
ioctls on vhost_dev with non-zero index. This may
end up with multiple VHOST_SET_BACKEND_FEATURES
ioctl calls sent down on the vhost-vdpa fd that is
shared between all these vhost_dev's.
To fix it, send down ioctl only once via the first
vhost_dev with index 0. Toggle the polarity of the
vhost_vdpa_one_time_request() test should do the
trick.
Si-Wei Liu [Sat, 7 May 2022 02:28:15 +0000 (19:28 -0700)]
vhost-net: fix improper cleanup in vhost_net_start
vhost_net_start() missed a corresponding stop_one() upon error from
vhost_set_vring_enable(). While at it, make the error handling for
err_start more robust. No real issue was found due to this though.
0 0x00007f8ce3ff3387 in raise () at /lib64/libc.so.6
1 0x00007f8ce3ff4a78 in abort () at /lib64/libc.so.6
2 0x00007f8ce3fec1a6 in __assert_fail_base () at /lib64/libc.so.6
3 0x00007f8ce3fec252 in () at /lib64/libc.so.6
4 0x0000558f52d79421 in vhost_vdpa_get_vq_index (dev=<optimized out>, idx=<optimized out>) at ../hw/virtio/vhost-vdpa.c:563
5 0x0000558f52d79421 in vhost_vdpa_get_vq_index (dev=<optimized out>, idx=<optimized out>) at ../hw/virtio/vhost-vdpa.c:558
6 0x0000558f52d7329a in vhost_virtqueue_mask (hdev=0x558f55c01800, vdev=0x558f568f91f0, n=2, mask=<optimized out>) at ../hw/virtio/vhost.c:1557
7 0x0000558f52c6b89a in virtio_pci_set_guest_notifier (d=d@entry=0x558f568f0f60, n=n@entry=2, assign=assign@entry=true, with_irqfd=with_irqfd@entry=false)
at ../hw/virtio/virtio-pci.c:974
8 0x0000558f52c6c0d8 in virtio_pci_set_guest_notifiers (d=0x558f568f0f60, nvqs=3, assign=true) at ../hw/virtio/virtio-pci.c:1019
9 0x0000558f52bf091d in vhost_net_start (dev=dev@entry=0x558f568f91f0, ncs=0x558f56937cd0, data_queue_pairs=data_queue_pairs@entry=1, cvq=cvq@entry=1)
at ../hw/net/vhost_net.c:361
10 0x0000558f52d4e5e7 in virtio_net_set_status (status=<optimized out>, n=0x558f568f91f0) at ../hw/net/virtio-net.c:289
11 0x0000558f52d4e5e7 in virtio_net_set_status (vdev=0x558f568f91f0, status=15 '\017') at ../hw/net/virtio-net.c:370
12 0x0000558f52d6c4b2 in virtio_set_status (vdev=vdev@entry=0x558f568f91f0, val=val@entry=15 '\017') at ../hw/virtio/virtio.c:1945
13 0x0000558f52c69eff in virtio_pci_common_write (opaque=0x558f568f0f60, addr=<optimized out>, val=<optimized out>, size=<optimized out>) at ../hw/virtio/virtio-pci.c:1292
14 0x0000558f52d15d6e in memory_region_write_accessor (mr=0x558f568f19d0, addr=20, value=<optimized out>, size=1, shift=<optimized out>, mask=<optimized out>, attrs=...)
at ../softmmu/memory.c:492
15 0x0000558f52d127de in access_with_adjusted_size (addr=addr@entry=20, value=value@entry=0x7f8cdbffe748, size=size@entry=1, access_size_min=<optimized out>, access_size_max=<optimized out>, access_fn=0x558f52d15cf0 <memory_region_write_accessor>, mr=0x558f568f19d0, attrs=...) at ../softmmu/memory.c:554
16 0x0000558f52d157ef in memory_region_dispatch_write (mr=mr@entry=0x558f568f19d0, addr=20, data=<optimized out>, op=<optimized out>, attrs=attrs@entry=...)
at ../softmmu/memory.c:1504
17 0x0000558f52d078e7 in flatview_write_continue (fv=fv@entry=0x7f8accbc3b90, addr=addr@entry=103079215124, attrs=..., ptr=ptr@entry=0x7f8ce6300028, len=len@entry=1, addr1=<optimized out>, l=<optimized out>, mr=0x558f568f19d0) at /home/opc/qemu-upstream/include/qemu/host-utils.h:165
18 0x0000558f52d07b06 in flatview_write (fv=0x7f8accbc3b90, addr=103079215124, attrs=..., buf=0x7f8ce6300028, len=1) at ../softmmu/physmem.c:2822
19 0x0000558f52d0b36b in address_space_write (as=<optimized out>, addr=<optimized out>, attrs=..., buf=buf@entry=0x7f8ce6300028, len=<optimized out>)
at ../softmmu/physmem.c:2914
20 0x0000558f52d0b3da in address_space_rw (as=<optimized out>, addr=<optimized out>, attrs=...,
attrs@entry=..., buf=buf@entry=0x7f8ce6300028, len=<optimized out>, is_write=<optimized out>) at ../softmmu/physmem.c:2924
21 0x0000558f52dced09 in kvm_cpu_exec (cpu=cpu@entry=0x558f55c2da60) at ../accel/kvm/kvm-all.c:2903
22 0x0000558f52dcfabd in kvm_vcpu_thread_fn (arg=arg@entry=0x558f55c2da60) at ../accel/kvm/kvm-accel-ops.c:49
23 0x0000558f52f9f04a in qemu_thread_start (args=<optimized out>) at ../util/qemu-thread-posix.c:556
24 0x00007f8ce4392ea5 in start_thread () at /lib64/libpthread.so.0
25 0x00007f8ce40bb9fd in clone () at /lib64/libc.so.6
The cause for the assert failure is due to that the vhost_dev index
for the ctrl vq was not aligned with actual one in use by the guest.
Upon multiqueue feature negotiation in virtio_net_set_multiqueue(),
if guest doesn't support multiqueue, the guest vq layout would shrink
to a single queue pair, consisting of 3 vqs in total (rx, tx and ctrl).
This results in ctrl_vq taking a different vhost_dev group index than
the default. We can map vq to the correct vhost_dev group by checking
if MQ is supported by guest and successfully negotiated. Since the
MQ feature is only present along with CTRL_VQ, we ensure the index
2 is only meant for the control vq while MQ is not supported by guest.
Si-Wei Liu [Sat, 7 May 2022 02:28:12 +0000 (19:28 -0700)]
virtio-net: setup vhost_dev and notifiers for cvq only when feature is negotiated
When the control virtqueue feature is absent or not negotiated,
vhost_net_start() still tries to set up vhost_dev and install
vhost notifiers for the control virtqueue, which results in
erroneous ioctl calls with incorrect queue index sending down
to driver. Do that only when needed.
Coverity issues several UNINIT warnings against amd_iommu.c [1]. This
patch fixes them by clearing evt before encoding. On top of it, this
patch changes the event log size to 16 bytes per IOMMU specification,
and fixes the event log entry format in amdvi_encode_event().
Xiaoyao Li [Thu, 10 Mar 2022 12:28:11 +0000 (20:28 +0800)]
hw/i386: Make pic a property of common x86 base machine type
Legacy PIC (8259) cannot be supported for TDX guests since TDX module
doesn't allow directly interrupt injection. Using posted interrupts
for the PIC is not a viable option as the guest BIOS/kernel will not
do EOI for PIC IRQs, i.e. will leave the vIRR bit set.
Make PIC the property of common x86 machine type. Hence all x86
machines, including microvm, can disable it.
According to 7.2.2 in [1] bit 27 is the last bit that can be part of the
bus number, this makes the ECAM max size equal to '1 << 28'. This patch
restores back this value into the PCIE_MMCFG_SIZE_MAX define (which was
changed in commit 58d5b22bbd5 ("ppc4xx: Add device models found in PPC440
core SoCs")).
[1] PCI Express® Base Specification Revision 5.0 Version 1.0
According to [1] address bits 27 - 20 are mapped to the bus number (the
TLPs bus number field is 8 bits). Below is the formula taken from Table
7-1 in [1].
"
Memory Address | PCI Express Configuration Space
A[(20+n-1):20] | Bus Number, 1 ≤ n ≤ 8
"
[1] PCI Express® Base Specification Revision 5.0 Version 1.0
Kevin Wolf [Thu, 7 Apr 2022 13:36:55 +0000 (15:36 +0200)]
docs/vhost-user: Clarifications for VHOST_USER_ADD/REM_MEM_REG
The specification for VHOST_USER_ADD/REM_MEM_REG messages is unclear
in several points, which has led to clients having incompatible
implementations. This changes the specification to be more explicit
about them:
* VHOST_USER_ADD_MEM_REG is not specified as receiving a file
descriptor, though it obviously does need to do so. All
implementations agree on this one, fix the specification.
* VHOST_USER_REM_MEM_REG is not specified as receiving a file
descriptor either, and it also has no reason to do so. rust-vmm does
not send file descriptors for removing a memory region (in agreement
with the specification), libvhost-user and QEMU do (which is a bug),
though libvhost-user doesn't actually make any use of it.
Change the specification so that for compatibility QEMU's behaviour
becomes legal, even if discouraged, but rust-vmm's behaviour becomes
the explicitly recommended mode of operation.
* VHOST_USER_ADD_MEM_REG doesn't have a documented return value, which
is the desired behaviour in the non-postcopy case. It also implemented
like this in QEMU and rust-vmm, though libvhost-user is buggy and
sometimes sends an unexpected reply. This will be fixed in a separate
patch.
However, in postcopy mode it does reply like VHOST_USER_SET_MEM_TABLE.
This behaviour is shared between libvhost-user and QEMU; rust-vmm
doesn't implement postcopy mode yet. Mention it explicitly in the
spec.
* The specification doesn't mention how VHOST_USER_REM_MEM_REG
identifies the memory region to be removed. Change it to describe the
existing behaviour of libvhost-user (guest address, user address and
size must match).
Merge tag 'pull-migration-20220516a' of https://gitlab.com/dagrh/qemu into staging
Migration pull 2022-05-16
(This replaces the 28th April through 10th May sets)
Compared to that last set it just has the Alpine
uring check that Leo has added; although that's also
now fixed upstream in Alpine.
It contains:
TLS test fixes from Dan
Zerocopy migration feature from Leo
Signed-off-by: Dr. David Alan Gilbert <[email protected]>
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# gpg: Signature made Mon 16 May 2022 07:46:37 AM PDT
# gpg: using RSA key 45F5C71B4A0CB7FB977A9FA90516331EBC5BFDE7
# gpg: Good signature from "Dr. David Alan Gilbert (RH2) <[email protected]>" [full]
* tag 'pull-migration-20220516a' of https://gitlab.com/dagrh/qemu:
multifd: Implement zero copy write in multifd migration (multifd-zero-copy)
multifd: Send header packet without flags if zero-copy-send is enabled
multifd: multifd_send_sync_main now returns negative on error
migration: Add migrate_use_tls() helper
migration: Add zero-copy-send parameter for QMP/HMP for Linux
QIOChannelSocket: Implement io_writev zero copy flag & io_flush for CONFIG_LINUX
QIOChannel: Add flags on io_writev and introduce io_flush callback
meson.build: Fix docker-test-build@alpine when including linux/errqueue.h
tests: ensure migration status isn't reported as failed
tests: add multifd migration tests of TLS with x509 credentials
tests: add multifd migration tests of TLS with PSK credentials
tests: convert multifd migration tests to use common helper
tests: convert XBZRLE migration test to use common helper
tests: add migration tests of TLS with x509 credentials
tests: add migration tests of TLS with PSK credentials
tests: add more helper macros for creating TLS x509 certs
tests: fix encoding of IP addresses in x509 certs
Merge tag 'pull-qapi-2022-05-16' of git://repo.or.cz/qemu/armbru into staging
QAPI patches patches for 2022-05-16
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# gpg: Signature made Sun 15 May 2022 10:35:32 PM PDT
# gpg: using RSA key 354BC8B3D7EB2A6B68674E5F3870B400EB918653
# gpg: issuer "[email protected]"
# gpg: Good signature from "Markus Armbruster <[email protected]>" [undefined]
# gpg: aka "Markus Armbruster <[email protected]>" [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: 354B C8B3 D7EB 2A6B 6867 4E5F 3870 B400 EB91 8653
* tag 'pull-qapi-2022-05-16' of git://repo.or.cz/qemu/armbru:
qapi/pragma: Tidy up comments
docs/devel/qapi-code-gen: Belatedly document feature naming rules
qapi/expr: Enforce feature naming rules again
qapi: Stop using whitespace for alignment in comments
qapi: Drop unnecessary whitespace in comments
qapi: Drop unnecessary empty lines outside of comments
qapi: Drop unnecessary empty lines in comments
qapi: Add missing separators between sections
qapi: Fix comment indentation
qapi: Drop stray trailing symbol
qapi: Fix malformed "Since:" section tags
Leonardo Bras [Fri, 13 May 2022 06:28:37 +0000 (03:28 -0300)]
multifd: Implement zero copy write in multifd migration (multifd-zero-copy)
Implement zero copy send on nocomp_send_write(), by making use of QIOChannel
writev + flags & flush interface.
Change multifd_send_sync_main() so flush_zero_copy() can be called
after each iteration in order to make sure all dirty pages are sent before
a new iteration is started. It will also flush at the beginning and at the
end of migration.
Also make it return -1 if flush_zero_copy() fails, in order to cancel
the migration process, and avoid resuming the guest in the target host
without receiving all current RAM.
This will work fine on RAM migration because the RAM pages are not usually freed,
and there is no problem on changing the pages content between writev_zero_copy() and
the actual sending of the buffer, because this change will dirty the page and
cause it to be re-sent on a next iteration anyway.
A lot of locked memory may be needed in order to use multifd migration
with zero-copy enabled, so disabling the feature should be necessary for
low-privileged users trying to perform multifd migrations.
Leonardo Bras [Fri, 13 May 2022 06:28:36 +0000 (03:28 -0300)]
multifd: Send header packet without flags if zero-copy-send is enabled
Since d48c3a0445 ("multifd: Use a single writev on the send side"),
sending the header packet and the memory pages happens in the same
writev, which can potentially make the migration faster.
Using channel-socket as example, this works well with the default copying
mechanism of sendmsg(), but with zero-copy-send=true, it will cause
the migration to often break.
This happens because the header packet buffer gets reused quite often,
and there is a high chance that by the time the MSG_ZEROCOPY mechanism get
to send the buffer, it has already changed, sending the wrong data and
causing the migration to abort.
It means that, as it is, the buffer for the header packet is not suitable
for sending with MSG_ZEROCOPY.
In order to enable zero copy for multifd, send the header packet on an
individual write(), without any flags, and the remanining pages with a
writev(), as it was happening before. This only changes how a migration
with zero-copy-send=true works, not changing any current behavior for
migrations with zero-copy-send=false.
Leonardo Bras [Fri, 13 May 2022 06:28:35 +0000 (03:28 -0300)]
multifd: multifd_send_sync_main now returns negative on error
Even though multifd_send_sync_main() currently emits error_reports, it's
callers don't really check it before continuing.
Change multifd_send_sync_main() to return -1 on error and 0 on success.
Also change all it's callers to make use of this change and possibly fail
earlier.
(This change is important to next patch on multifd zero copy
implementation, to make it sure an error in zero-copy flush does not go
unnoticed.
Leonardo Bras [Fri, 13 May 2022 06:28:33 +0000 (03:28 -0300)]
migration: Add zero-copy-send parameter for QMP/HMP for Linux
Add property that allows zero-copy migration of memory pages
on the sending side, and also includes a helper function
migrate_use_zero_copy_send() to check if it's enabled.
No code is introduced to actually do the migration, but it allow
future implementations to enable/disable this feature.
On non-Linux builds this parameter is compiled-out.
Leonardo Bras [Fri, 13 May 2022 06:28:32 +0000 (03:28 -0300)]
QIOChannelSocket: Implement io_writev zero copy flag & io_flush for CONFIG_LINUX
For CONFIG_LINUX, implement the new zero copy flag and the optional callback
io_flush on QIOChannelSocket, but enables it only when MSG_ZEROCOPY
feature is available in the host kernel, which is checked on
qio_channel_socket_connect_sync()
qio_channel_socket_flush() was implemented by counting how many times
sendmsg(...,MSG_ZEROCOPY) was successfully called, and then reading the
socket's error queue, in order to find how many of them finished sending.
Flush will loop until those counters are the same, or until some error occurs.
Notes on using writev() with QIO_CHANNEL_WRITE_FLAG_ZERO_COPY:
1: Buffer
- As MSG_ZEROCOPY tells the kernel to use the same user buffer to avoid copying,
some caution is necessary to avoid overwriting any buffer before it's sent.
If something like this happen, a newer version of the buffer may be sent instead.
- If this is a problem, it's recommended to call qio_channel_flush() before freeing
or re-using the buffer.
2: Locked memory
- When using MSG_ZERCOCOPY, the buffer memory will be locked after queued, and
unlocked after it's sent.
- Depending on the size of each buffer, and how often it's sent, it may require
a larger amount of locked memory than usually available to non-root user.
- If the required amount of locked memory is not available, writev_zero_copy
will return an error, which can abort an operation like migration,
- Because of this, when an user code wants to add zero copy as a feature, it
requires a mechanism to disable it, so it can still be accessible to less
privileged users.
Leonardo Bras [Fri, 13 May 2022 06:28:31 +0000 (03:28 -0300)]
QIOChannel: Add flags on io_writev and introduce io_flush callback
Add flags to io_writev and introduce io_flush as optional callback to
QIOChannelClass, allowing the implementation of zero copy writes by
subclasses.
How to use them:
- Write data using qio_channel_writev*(...,QIO_CHANNEL_WRITE_FLAG_ZERO_COPY),
- Wait write completion with qio_channel_flush().
Notes:
As some zero copy write implementations work asynchronously, it's
recommended to keep the write buffer untouched until the return of
qio_channel_flush(), to avoid the risk of sending an updated buffer
instead of the buffer state during write.
As io_flush callback is optional, if a subclass does not implement it, then:
- io_flush will return 0 without changing anything.
Also, some functions like qio_channel_writev_full_all() were adapted to
receive a flag parameter. That allows shared code between zero copy and
non-zero copy writev, and also an easier implementation on new flags.
Leonardo Bras [Fri, 13 May 2022 06:28:30 +0000 (03:28 -0300)]
meson.build: Fix docker-test-build@alpine when including linux/errqueue.h
A build error happens in alpine CI when linux/errqueue.h is included
in io/channel-socket.c, due to redefining of 'struct __kernel_timespec':
===
ninja: job failed: [...]
In file included from /usr/include/linux/errqueue.h:6,
from ../io/channel-socket.c:29:
/usr/include/linux/time_types.h:7:8: error: redefinition of 'struct __kernel_timespec'
7 | struct __kernel_timespec {
| ^~~~~~~~~~~~~~~~~
In file included from /usr/include/liburing.h:19,
from /builds/user/qemu/include/block/aio.h:18,
from /builds/user/qemu/include/io/channel.h:26,
from /builds/user/qemu/include/io/channel-socket.h:24,
from ../io/channel-socket.c:24:
/usr/include/liburing/compat.h:9:8: note: originally defined here
9 | struct __kernel_timespec {
| ^~~~~~~~~~~~~~~~~
ninja: subcommand failed
===
As above error message suggests, 'struct __kernel_timespec' was already
defined by liburing/compat.h.
Fix alpine CI by adding test to disable liburing in configure step if a
redefinition happens between linux/errqueue.h and liburing/compat.h.
[dgilbert: This has been fixed in Alpine issue 13813 and liburing]
tests: ensure migration status isn't reported as failed
Various methods in the migration test call 'query_migrate' to fetch the
current status and then access a particular field. Almost all of these
cases expect the migration to be in a non-failed state. In the case of
'wait_for_migration_pass' in particular, if the status is 'failed' then
it will get into an infinite loop. By validating that the status is
not 'failed' the test suite will assert rather than hang when getting
into an unexpected state.
tests: add multifd migration tests of TLS with x509 credentials
This validates that we correctly handle multifd migration success
and failure scenarios when using TLS with x509 certificates. There
are quite a few different scenarios that matter in relation to
hostname validation, but we skip a couple as we can assume that
the non-multifd coverage applies to some extent.
tests: convert multifd migration tests to use common helper
Most of the multifd migration test logic is common with the rest of the
precopy tests, so it can use the helper without difficulty. The only
exception of the multifd cancellation test which tries to run multiple
migrations in a row.
tests: add migration tests of TLS with x509 credentials
This validates that we correctly handle migration success and failure
scenarios when using TLS with x509 certificates. There are quite a few
different scenarios that matter in relation to hostname validation.
We need to encode just the address bytes, not the whole struct sockaddr
data. Add a test case to validate that we're matching on SAN IP
addresses correctly.
This patch adds a get_vhost() callback function for VirtIODevices that
returns the device's corresponding vhost_dev structure, if the vhost
device is running. This patch also adds a vhost_started flag for
VirtIODevices.
Previously, a VirtIODevice wouldn't be able to tell if its corresponding
vhost device was active or not.
This patch drops the name parameter for the virtio_init function.
The pair between the numeric device ID and the string device ID
(name) of a virtio device already exists, but not in a way that
lets us map between them.
This patch lets us do this and removes the need for the name
parameter in the virtio_init function.
At a couple of hundred bytes per notifier allocating one for every
potential queue is very wasteful as most devices only have a few
queues. Instead of having this handled statically dynamically assign
them and track in a GPtrArray.
[AJB: it's hard to trigger the vhost notifiers code, I assume as it
requires a KVM guest with appropriate backend]
Alex Bennée [Mon, 21 Mar 2022 15:30:36 +0000 (15:30 +0000)]
hw/virtio/vhost-user: don't suppress F_CONFIG when supported
Previously we would silently suppress VHOST_USER_PROTOCOL_F_CONFIG
during the protocol negotiation if the QEMU stub hadn't implemented
the vhost_dev_config_notifier. However this isn't the only way we can
handle config messages, the existing vdc->get/set_config can do this
as well.
Lightly re-factor the code to check for both potential methods and
instead of silently squashing the feature error out. It is unlikely
that a vhost-user backend expecting to handle CONFIG messages will
behave correctly if they never get sent.
Alex Bennée [Mon, 21 Mar 2022 15:30:34 +0000 (15:30 +0000)]
include/hw: start documenting the vhost API
While trying to get my head around the nest of interactions for vhost
devices I though I could start by documenting the key API functions.
This patch documents the main API hooks for creating and starting a
vhost device as well as how the configuration changes are handled.
While writing my own VirtIO devices I've gotten confused with how
things are structured and what sort of shared infrastructure there is.
If we can document how everything is supposed to work we can then
maybe start cleaning up inconsistencies in the code.
Alex Bennée [Mon, 21 Mar 2022 15:30:31 +0000 (15:30 +0000)]
vhost-user.rst: add clarifying language about protocol negotiation
Make the language about feature negotiation explicitly clear about the
handling of the VHOST_USER_F_PROTOCOL_FEATURES feature bit. Try and
avoid the sort of bug introduced in vhost.rs REPLY_ACK processing:
Paolo Bonzini [Mon, 21 Mar 2022 15:30:30 +0000 (15:30 +0000)]
docs: vhost-user: replace master/slave with front-end/back-end
This matches the nomenclature that is generally used. Also commonly used
is client/server, but it is not as clear because sometimes the front-end
exposes a passive (server) socket that the back-end connects to.
Paolo Bonzini [Mon, 21 Mar 2022 15:30:29 +0000 (15:30 +0000)]
docs: vhost-user: rewrite section on ring state machine
This section is using the word "back-end" to refer to the
"slave's back-end", and talking about the "client" for
what the rest of the document calls the "slave".
Rework it to free the use of the term "back-end", which in
the next patch will replace "slave".
Paolo Bonzini [Mon, 21 Mar 2022 15:30:28 +0000 (15:30 +0000)]
docs: vhost-user: clean up request/reply description
It is not necessary to mention which side is sending/receiving
each payload; it is more interesting to say which is the request
and which is the reply. This also matches what vhost-user-gpu.rst
already does.
While at it, ensure that all messages list both the request and
the reply payload.
These are useful when trying to debug the initial vhost-user
negotiation, especially when it hard to get logging from the low level
library on the other side.
Alex Bennée [Mon, 21 Mar 2022 15:30:25 +0000 (15:30 +0000)]
hw/virtio: move virtio-pci.h into shared include space
This allows other device classes that will be exposed via PCI to be
able to do so in the appropriate hw/ directory. I resisted the
temptation to re-order headers to be more aesthetically pleasing.
Jason Wang [Thu, 17 Mar 2022 08:05:21 +0000 (16:05 +0800)]
intel-iommu: update root_scalable before switching as during post_load
We need check whether passthrough is enabled during
vtd_switch_address_space() by checking the context entries. This
requires the root_scalable to be set correctly otherwise we may try to
check legacy rsvd bits instead of scalable ones.
Fixing this by updating root_scalable before switching the address
spaces during post_load.
Jason Wang [Thu, 10 Feb 2022 09:28:15 +0000 (17:28 +0800)]
intel-iommu: block output address in interrupt address range
According to vtd spec v3.3 3.14:
"""
Software must not program paging-structure entries to remap any
address to the interrupt address range. Untranslated requests and
translation requests that result in an address in the interrupt range
will be blocked with condition code LGN.4 or SGN.8.
"""
This patch blocks the request that result in interrupt address range.
We don't need to check kvm_enable_x2apic(). It's perfectly OK to support
interrupt remapping even if we can't address CPUs above 254. Kind of
pointless, but still functional.
The check on kvm_enable_x2apic() needs to happen *anyway* in order to
allow CPUs above 254 even without an IOMMU, so allow that to happen
elsewhere.
However, we do require the *split* irqchip in order to rewrite I/OAPIC
destinations. So fix that check while we're here.
David Woodhouse [Mon, 14 Mar 2022 14:25:42 +0000 (14:25 +0000)]
intel_iommu: Support IR-only mode without DMA translation
By setting none of the SAGAW bits we can indicate to a guest that DMA
translation isn't supported. Tested by booting Windows 10, as well as
Linux guests with the fix at https://git.kernel.org/torvalds/c/c40aaaac10
David Woodhouse [Mon, 14 Mar 2022 14:25:41 +0000 (14:25 +0000)]
target/i386: Fix sanity check on max APIC ID / X2APIC enablement
The check on x86ms->apic_id_limit in pc_machine_done() had two problems.
Firstly, we need KVM to support the X2APIC API in order to allow IRQ
delivery to APICs >= 255. So we need to call/check kvm_enable_x2apic(),
which was done elsewhere in *some* cases but not all.
Secondly, microvm needs the same check. So move it from pc_machine_done()
to x86_cpus_init() where it will work for both.
The check in kvm_cpu_instance_init() is now redundant and can be dropped.
Commit 05ebf841ef "qapi: Enforce command naming rules" inserted new
code between a comment and the code it applies to. Move the comment
back to its code, and add one for the new code.
qapi: Stop using whitespace for alignment in comments
Perfectly aligned things look pretty, but keeping them that
way as the schema evolves requires churn, and in some cases
newly-added lines are not aligned properly.
Overall, trying to align things is just not worth the trouble.
Merge tag 'or1k-pull-request-20220515' of https://github.com/stffrdhrn/qemu into staging
OpenRISC Fixes for 7.0
- A few or1ksim fixes and enhancements
- A fix for OpenRISC tcg backend around delay slot handling
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# gpg: Signature made Sat 14 May 2022 06:34:35 PM PDT
# gpg: using RSA key D9C47354AEF86C103A25EFF1C3B31C2D5E6627E4
# gpg: Good signature from "Stafford Horne <[email protected]>" [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: D9C4 7354 AEF8 6C10 3A25 EFF1 C3B3 1C2D 5E66 27E4
* tag 'or1k-pull-request-20220515' of https://github.com/stffrdhrn/qemu:
target/openrisc: Do not reset delay slot flag on early tb exit
hw/openrisc: use right OMPIC size variable
hw/openrisc: support 4 serial ports in or1ksim
hw/openrisc: page-align FDT address
Stafford Horne [Wed, 11 May 2022 11:47:50 +0000 (20:47 +0900)]
target/openrisc: Do not reset delay slot flag on early tb exit
This was found when running linux crypto algorithm selftests used by
wireguard. We found that randomly the tests would fail. We found
through investigation that a combination of a tick timer interrupt,
raised when executing a delay slot instruction at a page boundary caused
the issue.
This was caused when handling the TB_EXIT_REQUESTED case in cpu_tb_exec.
On OpenRISC, which doesn't implement synchronize_from_tb, set_pc was
being used as a fallback. The OpenRISC set_pc implementation clears
dflag, which caused the exception handling logic to not account for the
delay slot. This was the bug, because it meant when execution resumed
after the interrupt was handling it resumed in the wrong place.
Fix this by implementing synchronize_from_tb which simply updates pc,
and not clear the delay slot flag.
This appears to be a copy and paste error. The UART size was used
instead of the much smaller OMPIC size. But actually that smaller OMPIC
size is wrong too and doesn't allow the IPI to work in Linux. So set it
to the old value.
Signed-off-by: Jason A. Donenfeld <[email protected]>
[smh:Updated OR1KSIM_OMPIC size to use OR1KSIM_CPUS_MAX] Signed-off-by: Stafford Horne <[email protected]>
Paolo Bonzini [Wed, 27 Apr 2022 10:27:46 +0000 (12:27 +0200)]
introduce -audio as a replacement for -soundhw
-audio is used like "-audio pa,model=sb16". It is almost as simple as
-soundhw, but it reuses the -audiodev parsing machinery and attaches an
audiodev to the newly-created device. The main 'feature' is that
it knows about adding the codec device for model=intel-hda, and adding
the audiodev to the codec device.
In the future, it could be extended to support default models or
builtin devices, just like -nic, or even a default backend. For now,
keep it simple.
Paolo Bonzini [Wed, 27 Apr 2022 10:04:47 +0000 (12:04 +0200)]
soundhw: remove ability to create multiple soundcards
The usefulness of enabling a dozen soundcards is dubious. Simplify the
code by allowing a single instance of -soundhw, with no support for
parsing either comma-separated values or 'soundhw all'.
Paolo Bonzini [Mon, 9 May 2022 09:46:03 +0000 (11:46 +0200)]
rng: make opened property read-only
The ``opened=on`` option in the command line or QMP ``object-add`` either had
no effect (if ``opened`` was the last option) or caused errors. The property
is therefore useless and was deprecated in 6.0; make it read-only now.
Paolo Bonzini [Mon, 9 May 2022 09:42:23 +0000 (11:42 +0200)]
crypto: make loaded property read-only
The ``loaded=on`` option in the command line or QMP ``object-add`` either had
no effect (if ``loaded`` was the last option) or caused options to be
effectively ignored as if they were not given. The property is therefore
useless and was deprecated in 6.0; make it read-only now.
Yang Weijiang [Tue, 15 Feb 2022 19:52:58 +0000 (14:52 -0500)]
target/i386: Support Arch LBR in CPUID enumeration
If CPUID.(EAX=07H, ECX=0):EDX[19] is set to 1, the processor
supports Architectural LBRs. In this case, CPUID leaf 01CH
indicates details of the Architectural LBRs capabilities.
XSAVE support for Architectural LBRs is enumerated in
CPUID.(EAX=0DH, ECX=0FH).
Yang Weijiang [Tue, 15 Feb 2022 19:52:56 +0000 (14:52 -0500)]
target/i386: Add MSR access interface for Arch LBR
In the first generation of Arch LBR, the max support
Arch LBR depth is 32, both host and guest use the value
to set depth MSR. This can simplify the implementation
of patch given the side-effect of mismatch of host/guest
depth MSR: XRSTORS will reset all recording MSRs to 0s
if the saved depth mismatches MSR_ARCH_LBR_DEPTH.
In most of the cases Arch LBR is not in active status,
so check the control bit before save/restore the big
chunck of Arch LBR MSRs.
Yang Weijiang [Tue, 15 Feb 2022 19:52:54 +0000 (14:52 -0500)]
target/i386: Enable support for XSAVES based features
There're some new features, including Arch LBR, depending
on XSAVES/XRSTORS support, the new instructions will
save/restore data based on feature bits enabled in XCR0 | XSS.
This patch adds the basic support for related CPUID enumeration
and meanwhile changes the name from FEAT_XSAVE_COMP_{LO|HI} to
FEAT_XSAVE_XCR0_{LO|HI} to differentiate clearly the feature
bits in XCR0 and those in XSS.
Yang Weijiang [Tue, 15 Feb 2022 19:52:53 +0000 (14:52 -0500)]
target/i386: Add kvm_get_one_msr helper
When try to get one msr from KVM, I found there's no such kind of
existing interface while kvm_put_one_msr() is there. So here comes
the patch. It'll remove redundant preparation code before finally
call KVM_GET_MSRS IOCTL.
Yang Weijiang [Tue, 15 Feb 2022 19:52:52 +0000 (14:52 -0500)]
target/i386: Add lbr-fmt vPMU option to support guest LBR
The Last Branch Recording (LBR) is a performance monitor unit (PMU)
feature on Intel processors which records a running trace of the most
recent branches taken by the processor in the LBR stack. This option
indicates the LBR format to enable for guest perf.
The LBR feature is enabled if below conditions are met:
1) KVM is enabled and the PMU is enabled.
2) msr-based-feature IA32_PERF_CAPABILITIES is supporterd on KVM.
3) Supported returned value for lbr_fmt from above msr is non-zero.
4) Guest vcpu model does support FEAT_1_ECX.CPUID_EXT_PDCM.
5) User-provided lbr-fmt value doesn't violate its bitmask (0x3f).
6) Target guest LBR format matches that of host.
Robert Hoo [Mon, 14 Mar 2022 08:50:59 +0000 (16:50 +0800)]
i386/cpu: Remove the deprecated cpu model 'Icelake-Client'
Icelake, is the codename for Intel 3rd generation Xeon Scalable server
processors. There isn't ever client variants. This "Icelake-Client" CPU
model was added wrongly and imaginarily.
It has been deprecated since v5.2, now it's time to remove it completely
from code.
Ivan Shcherbakov [Sat, 14 May 2022 05:50:21 +0000 (07:50 +0200)]
WHPX: fixed TPR/CR8 translation issues affecting VM debugging
This patch fixes the following error that would occur when trying to resume
a WHPX-accelerated VM from a breakpoint:
qemu: WHPX: Failed to set interrupt state registers, hr=c0350005
The error arises from an incorrect CR8 value being passed to
WHvSetVirtualProcessorRegisters() that doesn't match the
value set via WHvSetVirtualProcessorInterruptControllerState2().
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