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Alex Williamson 94eacb45d8 vfio/mtty: Overhaul mtty interrupt handling 
[ Upstream commit 293fbc2881 ]

The mtty driver does not currently conform to the vfio SET_IRQS uAPI.
For example, it claims to support mask and unmask of INTx, but actually
does nothing.  It claims to support AUTOMASK for INTx, but doesn't.  It
fails to teardown eventfds under the full semantics specified by the
SET_IRQS ioctl.  It also fails to teardown eventfds when the device is
closed, leading to memory leaks.  It claims to support the request IRQ,
but doesn't.

Fix all these.

A side effect of this is that QEMU will now report a warning:

vfio <uuid>: Failed to set up UNMASK eventfd signaling for interrupt \
INTX-0: VFIO_DEVICE_SET_IRQS failure: Inappropriate ioctl for device

The fact is that the unmask eventfd was never supported but quietly
failed.  mtty never honored the AUTOMASK behavior, therefore there
was nothing to unmask.  QEMU is verbose about the failure, but
properly falls back to userspace unmasking.

Fixes: 9d1a546c53 ("docs: Sample driver to demonstrate how to use Mediated device framework.")
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/r/20231016224736.2575718-2-alex.williamson@redhat.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-01-10 17:16:55 +01:00
arch ARM: sun9i: smp: Fix array-index-out-of-bounds read in sunxi_mc_smp_init 2024-01-10 17:16:50 +01:00
block blk-cgroup: bypass blkcg_deactivate_policy after destroying 2023-12-20 17:01:55 +01:00
certs certs: Reference revocation list for all keyrings 2023-08-17 20:12:41 +00:00
crypto crypto: xts - use 'spawn' for underlying single-block cipher 2024-01-10 17:16:54 +01:00
Documentation dt-bindings: nvmem: mxs-ocotp: Document fsl,ocotp 2024-01-01 12:42:42 +00:00
drivers crypto: hisilicon/qm - fix EQ/AEQ interrupt issue 2024-01-10 17:16:55 +01:00
fs mm: convert DAX lock/unlock page to lock/unlock folio 2024-01-10 17:16:53 +01:00
include crypto: hisilicon/qm - fix EQ/AEQ interrupt issue 2024-01-10 17:16:55 +01:00
init proc: sysctl: prevent aliased sysctls from getting passed to init 2023-11-28 17:19:57 +00:00
io_uring io_uring/cmd: fix breakage in SOCKET_URING_OP_SIOC* implementation 2023-12-20 17:01:52 +01:00
ipc Add x86 shadow stack support 2023-08-31 12:20:12 -07:00
kernel tracing: Fix blocked reader of snapshot buffer 2024-01-05 15:19:44 +01:00
lib maple_tree: do not preallocate nodes for slot stores 2024-01-05 15:19:43 +01:00
LICENSES
mm mm/memory-failure: pass the folio and the page to collect_procs() 2024-01-10 17:16:54 +01:00
net tcp: derive delack_max from rto_min 2024-01-10 17:16:54 +01:00
rust rust: docs: fix logo replacement 2023-10-19 16:40:00 +02:00
samples vfio/mtty: Overhaul mtty interrupt handling 2024-01-10 17:16:55 +01:00
scripts scripts/checkstack.pl: match all stack sizes for s390 2023-12-20 17:01:59 +01:00
security apparmor: Fix move_mount mediation by detecting if source is detached 2024-01-10 17:16:52 +01:00
sound ASoC: meson: g12a-tohdmitx: Fix event generation for S/PDIF mux 2024-01-10 17:16:51 +01:00
tools bpftool: Align output skeleton ELF code 2024-01-10 17:16:54 +01:00
usr
virt ARM: 2023-09-07 13:52:20 -07:00
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.mailmap 20 hotfixes. 12 are cc:stable and the remainder address post-6.5 issues 2023-10-24 09:52:16 -10:00
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MAINTAINERS Char/Misc driver fixes for 6.6-final 2023-10-28 07:51:27 -10:00
Makefile Linux 6.6.10 2024-01-05 15:19:45 +01:00
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