We're no longer checking anything that requires the work item to be
initialized, as we're not carrying any file related state there.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Destroy current's io-wq backend and tctx on __io_uring_task_cancel(),
aka exec(). Looks it's not strictly necessary, because it will be done
at some point when the task dies and changes of creds/files/etc. are
handled, but better to do that earlier to free io-wq and not potentially
lock previous mm and other resources for the time being.
It's safe to do because we wait for all requests of the current task to
complete, so no request will use tctx afterwards. Note, that
io_uring_files_cancel() may leave some requests for later reaping, so it
leaves tctx intact, that's ok as the task is dying anyway.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Make sure that we killed an io-wq by the time a task is dead.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
We clear the bit marking the ctx task_work as active after having run
the queued work, but we really should be clearing it before. Otherwise
we can hit a tiny race ala:
CPU0 CPU1
io_task_work_add() tctx_task_work()
run_work
add_to_list
test_and_set_bit
clear_bit
already set
and CPU0 will return thinking the task_work is queued, while in reality
it's already being run. If we hit the condition after __tctx_task_work()
found no more work, but before we've cleared the bit, then we'll end up
thinking it's queued and will be run. In reality it is queued, but we
didn't queue the ctx task_work to ensure that it gets run.
Fixes: 7cbf1722d5 ("io_uring: provide FIFO ordering for task_work")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
If we put the io-wq from io_uring, we really want it to exit. Provide
a helper that does that for us. Couple that with not having the manager
hold a reference to the 'wq' and the normal SQPOLL exit will tear down
the io-wq context appropriate.
On the io-wq side, our wq context is per task, so only the task itself
is manipulating ->manager and hence it's safe to check and clear without
any extra locking. We just need to ensure that the manager task stays
around, in case it exits.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
We want to reuse this completion, and a single complete should do just
fine. Ensure that we park ourselves first if requested, as that is what
lead to the initial deadlock in this area. If we've got someone attempting
to park us, then we can't proceed without having them finish first.
Fixes: 37d1e2e364 ("io_uring: move SQPOLL thread io-wq forked worker")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
io_uring_try_cancel_requests() matches not only current's requests, but
also of other exiting tasks, so we need to actively cancel them and not
just wait, especially since the function can be called on flush during
do_exit() -> exit_files().
Even if it's not a problem for now, it's much nicer to know that the
function tries to cancel everything it can.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
If we fail to fork an SQPOLL worker, we can hit cancel, and hence
attempted thread stop, with the thread already being stopped. Ensure
we check for that.
Also guard thread stop fully by the sqd mutex, just like we do for
park.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
We are already freeing the wq struct in both spots, so don't put it and
get it freed twice.
Reported-by: syzbot+7bf785eedca35ca05501@syzkaller.appspotmail.com
Fixes: 4fb6ac3262 ("io-wq: improve manager/worker handling over exec")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
The manager waits for the workers, hence the manager is always valid if
workers are running. Now also have wq destroy wait for the manager on
exit, so we now everything is gone.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This is a leftover from a different use cases, it's used to wait for
the manager to startup. Rename it as such.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
If we're in the process of shutting down the async context, then don't
create new workers if we already have at least the fixed one.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Instead of having to wait separately on workers and manager, just have
the manager wait on the workers. We use an atomic_t for the reference
here, as we need to start at 0 and allow increment from that. Since the
number of workers is naturally capped by the allowed nr of processes,
and that uses an int, there is no risk of overflow.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
As per Intel vt-d spec, Rev 3.0 (section 10.4.45 "Virtual Command Response
Register"), the status code of "No PASID available" error in response to
the Allocate PASID command is 2, not 1. The same for "Invalid PASID" error
in response to the Free PASID command.
We will otherwise see confusing kernel log under the command failure from
guest side. Fix it.
Fixes: 24f27d32ab ("iommu/vt-d: Enlightened PASID allocation")
Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20210227073909.432-1-yuzenghui@huawei.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
The lazy IOTLB flushing setup leaves a time window, in which the device
can still access some system memory, which has already been unmapped by
the device driver. It's not suitable for untrusted devices. A malicious
device might use this to attack the system by obtaining data that it
shouldn't obtain.
Fixes: c588072bba ("iommu/vt-d: Convert intel iommu driver to the iommu ops")
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20210225061454.2864009-1-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Commit 25938c73cd ("iommu/tegra-smmu: Rework tegra_smmu_probe_device()")
removed certain hack in the tegra_smmu_probe() by relying on IOMMU core to
of_xlate SMMU's SID per device, so as to get rid of tegra_smmu_find() and
tegra_smmu_configure() that are typically done in the IOMMU core also.
This approach works for both existing devices that have DT nodes and other
devices (like PCI device) that don't exist in DT, on Tegra210 and Tegra3
upon testing. However, Page Fault errors are reported on tegra124-Nyan:
tegra-mc 70019000.memory-controller: display0a: read @0xfe056b40:
EMEM address decode error (SMMU translation error [--S])
tegra-mc 70019000.memory-controller: display0a: read @0xfe056b40:
Page fault (SMMU translation error [--S])
After debugging, I found that the mentioned commit changed some function
callback sequence of tegra-smmu's, resulting in enabling SMMU for display
client before display driver gets initialized. I couldn't reproduce exact
same issue on Tegra210 as Tegra124 (arm-32) differs at arch-level code.
Actually this Page Fault is a known issue, as on most of Tegra platforms,
display gets enabled by the bootloader for the splash screen feature, so
it keeps filling the framebuffer memory. A proper fix to this issue is to
1:1 linear map the framebuffer memory to IOVA space so the SMMU will have
the same address as the physical address in its page table. Yet, Thierry
has been working on the solution above for a year, and it hasn't merged.
Therefore, let's partially revert the mentioned commit to fix the errors.
The reason why we do a partial revert here is that we can still set priv
in ->of_xlate() callback for PCI devices. Meanwhile, devices existing in
DT, like display, will go through tegra_smmu_configure() at the stage of
bus_set_iommu() when SMMU gets probed(), as what it did before we merged
the mentioned commit.
Once we have the linear map solution for framebuffer memory, this change
can be cleaned away.
[Big thank to Guillaume who reported and helped debugging/verification]
Fixes: 25938c73cd ("iommu/tegra-smmu: Rework tegra_smmu_probe_device()")
Reported-by: Guillaume Tucker <guillaume.tucker@collabora.com>
Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Tested-by: Guillaume Tucker <guillaume.tucker@collabora.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20210218220702.1962-1-nicoleotsuka@gmail.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
increase_address_space() calls get_zeroed_page(gfp) under spin_lock with
disabled interrupts. gfp flags passed to increase_address_space() may allow
sleeping, so it comes to this:
BUG: sleeping function called from invalid context at mm/page_alloc.c:4342
in_atomic(): 1, irqs_disabled(): 1, pid: 21555, name: epdcbbf1qnhbsd8
Call Trace:
dump_stack+0x66/0x8b
___might_sleep+0xec/0x110
__alloc_pages_nodemask+0x104/0x300
get_zeroed_page+0x15/0x40
iommu_map_page+0xdd/0x3e0
amd_iommu_map+0x50/0x70
iommu_map+0x106/0x220
vfio_iommu_type1_ioctl+0x76e/0x950 [vfio_iommu_type1]
do_vfs_ioctl+0xa3/0x6f0
ksys_ioctl+0x66/0x70
__x64_sys_ioctl+0x16/0x20
do_syscall_64+0x4e/0x100
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Fix this by moving get_zeroed_page() out of spin_lock/unlock section.
Fixes: 754265bcab ("iommu/amd: Fix race in increase_address_space()")
Signed-off-by: Andrey Ryabinin <arbn@yandex-team.com>
Acked-by: Will Deacon <will@kernel.org>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20210217143004.19165-1-arbn@yandex-team.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
the register offset isn't needed division by 4 to pass RREG32_PCIE()
Signed-off-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Currently if stream->signal is neither SIGNAL_TYPE_DISPLAY_PORT_MST or
SIGNAL_TYPE_DISPLAY_PORT then variable ret is uninitialized and this is
checked for > 0 at the end of the function. Ret should be initialized,
I believe setting it to zero is a correct default.
Addresses-Coverity: ("Uninitialized scalar variable")
Fixes: bd0c064c16 ("drm/amd/display: Add return code instead of boolean for future use")
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
It works fine and was only disabled because primary GPUs
don't enter runpm if there is a console bound to the fbdev due
to the kmap. This will at least allow runpm on secondary cards.
Reviewed-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Arcturus has a different register address from other SMU V11
ASICs.
Signed-off-by: Evan Quan <evan.quan@amd.com>
Acked-by: Guchun Chen <guchun.chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Per discussions with PMFW team, the driver only needs to
notify the PMFW when the RLC is disabled. The RLC FW will notify
the PMFW directly when it's enabled.
Acked-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Making them an error confuses users and the errors are harmless
as not all asics support all profiles.
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1488
Acked-by: Nirmoy Das <nirmoy.das@amd.com>
Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Navi12 0x7360/C7 SKU has no video support, so remove it.
Reviewed-by: Guchun Chen <guchun.chen@amd.com>
Signed-off-by: Asher.Song <Asher.Song@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
The S0ix check only makes sense if the AMD PMC driver is
present. We need to use the legacy S3 pathes when the
PMC driver is not present.
Reviewed-by: Prike Liang <Prike.Liang@amd.com>
Reviewed-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Commit 8b9d680258 ("ACPI: Constify acpi_bus helper functions,
switch to macros") only changed functions for CONFIG_ACPI=y case.
This part adjusts the rest.
Fixes: 8b9d680258 ("ACPI: Constify acpi_bus helper functions, switch to macros")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Fix the following W=1 compilation warning:
drivers/infiniband/core/uverbs_ioctl.c:108: warning: expecting prototype for uverbs_alloc(). Prototype was for _uverbs_alloc() instead
Fixes: 461bb2eee4 ("IB/uverbs: Add a simple allocator to uverbs_attr_bundle")
Link: https://lore.kernel.org/r/20210302074214.1054299-3-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
The W=1 allmodconfig build produces the following warning:
drivers/infiniband/hw/mlx5/odp.c:1086: warning: wrong kernel-doc identifier on line:
* Parse a series of data segments for page fault handling.
Fix it by changing /** to be /* as it is written in kernel-doc
documentation.
Fixes: 5e769e444d ("RDMA/hw/mlx5/odp: Fix formatting and add missing descriptions in 'pagefault_data_segments()'")
Link: https://lore.kernel.org/r/20210302074214.1054299-2-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Somewhere along the line, probably during a rebase, an unintentional
dump_stack() got included. Revert this change.
Reported-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Fixes: 90cba8d20f ("tpm/ppi: Constify static struct attribute_group")
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
The copy_to_user() function returns the number of bytes remaining but
we want to return -EFAULT to the user if it can't complete the copy.
The "st" variable only holds zero on success or negative error codes on
failure so the type should be int.
Fixes: 36f988e978 ("rsxx: Adding in debugfs entries.")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This adds a new SND_PCI_QUIRK(...) and applies it to the Intel NUC 10
devices. This fixes the issue of the devices not having audio input and
output on the headset jack because the kernel does not recognize when
something is plugged in.
The new quirk was inspired by the quirk for the Intel NUC 8 devices, but
it turned out that the NUC 10 uses another pin. This information was
acquired by black box testing likely pins.
Co-developed-by: Eckhart Mohr <e.mohr@tuxedocomputers.com>
Signed-off-by: Eckhart Mohr <e.mohr@tuxedocomputers.com>
Signed-off-by: Werner Sembach <wse@tuxedocomputers.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20210302180414.23194-1-wse@tuxedocomputers.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Since commit 9e2369c06c ("xen: add helpers to allocate unpopulated
memory") foreign mappings are using guest physical addresses allocated
via ZONE_DEVICE functionality.
This will result in problems for the case of no balloon memory hotplug
being configured, as the p2m list will only cover the initial memory
size of the domain. Any ZONE_DEVICE allocated address will be outside
the p2m range and thus a mapping can't be established with that memory
address.
Fix that by extending the p2m size for that case. At the same time add
a check for a to be created mapping to be within the p2m limits in
order to detect errors early.
While changing a comment, remove some 32-bit leftovers.
This is XSA-369.
Fixes: 9e2369c06c ("xen: add helpers to allocate unpopulated memory")
Cc: <stable@vger.kernel.org> # 5.9
Reported-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Commit 3194a1746e ("xen-netback: don't "handle" error by BUG()")
dropped respective a BUG_ON() without noticing that with this the
variable's value wouldn't be consumed anymore. With gnttab_set_map_op()
setting all status fields to a non-zero value, in case of an error no
slot should have a status of GNTST_okay (zero).
This is part of XSA-367.
Cc: <stable@vger.kernel.org>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/d933f495-619a-0086-5fb4-1ec3cf81a8fc@suse.com
Signed-off-by: Juergen Gross <jgross@suse.com>
Bailing immediately from set_foreign_p2m_mapping() upon a p2m updating
error leaves the full batch in an ambiguous state as far as the caller
is concerned. Instead flags respective slots as bad, unmapping what
was mapped there right away.
HYPERVISOR_grant_table_op()'s return value and the individual unmap
slots' status fields get used only for a one-time - there's not much we
can do in case of a failure.
Note that there's no GNTST_enomem or alike, so GNTST_general_error gets
used.
The map ops' handle fields get overwritten just to be on the safe side.
This is part of XSA-367.
Cc: <stable@vger.kernel.org>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/96cccf5d-e756-5f53-b91a-ea269bfb9be0@suse.com
Signed-off-by: Juergen Gross <jgross@suse.com>
-----BEGIN PGP SIGNATURE-----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=fEry
-----END PGP SIGNATURE-----
Merge tag 'misc-5.12-2021-03-02' of git://git.kernel.dk/linux-block
Pull misc fixes from Jens Axboe:
"Two misc fixes that don't belong in other branches:
- Fix a regression with ia64 signals, introduced by the
TIF_NOTIFY_SIGNAL change in 5.11.
- Fix the current swapfile regression from this merge window"
* tag 'misc-5.12-2021-03-02' of git://git.kernel.dk/linux-block:
swap: fix swapfile read/write offset
ia64: don't call handle_signal() unless there's actually a signal queued
We're not factoring in the start of the file for where to write and
read the swapfile, which leads to very unfortunate side effects of
writing where we should not be...
Fixes: 48d15436fd ("mm: remove get_swap_bio")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Sergei and John both reported that ia64 failed to boot in 5.11, and it
was related to signals. Turns out the ia64 signal handling is a bit odd,
it doesn't check the return value of get_signal() for whether there's a
signal to deliver or not. With the introduction of TIF_NOTIFY_SIGNAL,
then task_work could trigger it.
Fix it by only calling handle_signal() if we actually have a real signal
to deliver. This brings it in line with all other archs, too.
Fixes: b269c229b0 ("ia64: add support for TIF_NOTIFY_SIGNAL")
Reported-by: Sergei Trofimovich <slyich@gmail.com>
Reported-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Tested-by: Sergei Trofimovich <slyich@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
On little endian system, Use aarch64_be(gcc v7.3) downloaded from
linaro.org to build image with CONFIG_CPU_BIG_ENDIAN = y,
CONFIG_FTRACE = y, CONFIG_DYNAMIC_FTRACE = y.
gcc will create symbols of _mcount but recordmcount can not create
mcount_loc for *.o.
aarch64_be-linux-gnu-objdump -r fs/namei.o | grep mcount
00000000000000d0 R_AARCH64_CALL26 _mcount
...
0000000000007190 R_AARCH64_CALL26 _mcount
The reason is than funciton arm64_is_fake_mcount can not work correctly.
A symbol of _mcount in *.o compiled with big endian compiler likes:
00 00 00 2d 00 00 01 1b
w(rp->r_info) will return 0x2d instead of 0x011b. Because w() takes
uint32_t as parameter, which truncates rp->r_info.
Use w8() instead w() to read relp->r_info
Link: https://lkml.kernel.org/r/20210222135840.56250-1-chenjun102@huawei.com
Fixes: ea0eada456 ("recordmcount: only record relocation of type R_AARCH64_CALL26 on arm64.")
Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Chen Jun <chenjun102@huawei.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
There is a quite huge "uncorrectable error in header" flood in KMSG
on a clean system boot since there is no pstore buffer saved in RAM.
Let's silence the redundant noisy messages by rate-limiting the printk
message. Now there are maximum 10 messages printed repeatedly instead
of 35+.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210302095850.30894-1-digetx@gmail.com
This problem was reported on a SVM guest while executing kexec.
Kexec fails to load the new kernel when the PCID feature is enabled.
When kexec starts loading the new kernel, it starts the process by
resetting the vCPU's and then bringing each vCPU online one by one.
The vCPU reset is supposed to reset all the register states before the
vCPUs are brought online. However, the CR4 register is not reset during
this process. If this register is already setup during the last boot,
all the flags can remain intact. The X86_CR4_PCIDE bit can only be
enabled in long mode. So, it must be enabled much later in SMP
initialization. Having the X86_CR4_PCIDE bit set during SMP boot can
cause a boot failures.
Fix the issue by resetting the CR4 register in init_vmcb().
Signed-off-by: Babu Moger <babu.moger@amd.com>
Message-Id: <161471109108.30811.6392805173629704166.stgit@bmoger-ubuntu>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This is how Xen guests do steal time accounting. The hypervisor records
the amount of time spent in each of running/runnable/blocked/offline
states.
In the Xen accounting, a vCPU is still in state RUNSTATE_running while
in Xen for a hypercall or I/O trap, etc. Only if Xen explicitly schedules
does the state become RUNSTATE_blocked. In KVM this means that even when
the vCPU exits the kvm_run loop, the state remains RUNSTATE_running.
The VMM can explicitly set the vCPU to RUNSTATE_blocked by using the
KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_CURRENT attribute, and can also use
KVM_XEN_VCPU_ATTR_TYPE_RUNSTATE_ADJUST to retrospectively add a given
amount of time to the blocked state and subtract it from the running
state.
The state_entry_time corresponds to get_kvmclock_ns() at the time the
vCPU entered the current state, and the total times of all four states
should always add up to state_entry_time.
Co-developed-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Message-Id: <20210301125309.874953-2-dwmw2@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
When clearing the per-vCPU shared regions, set the return value to zero
to indicate success. This was causing spurious errors to be returned to
userspace on soft reset.
Also add a paranoid BUILD_BUG_ON() for compat structure compatibility.
Fixes: 0c165b3c01 ("KVM: x86/xen: Allow reset of Xen attributes")
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Message-Id: <20210301125309.874953-1-dwmw2@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
The vcpu mmap area may consist of more than just the kvm_run struct.
Allocate enough space for the entire vcpu mmap area. Without this, on
x86, the PIO page, for example, will be missing. This is problematic
when dealing with an unhandled exception from the guest as the exception
vector will be incorrectly reported as 0x0.
Message-Id: <20210210165035.3712489-1-aaronlewis@google.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Co-developed-by: Steve Rutherford <srutherford@google.com>
Signed-off-by: Aaron Lewis <aaronlewis@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
It should be 7.23 instead of 7.22, which has already been taken by
KVM_CAP_X86_BUS_LOCK_EXIT.
Signed-off-by: Kai Huang <kai.huang@intel.com>
Message-Id: <20210226094832.380394-1-kai.huang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
The Xen hypercall interface adds to the attack surface of the hypervisor
and will be used quite rarely. Allow compiling it out.
Suggested-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Correct the comments since bfq_fifo_expire[0] is for async request,
while bfq_fifo_expire[1] is for sync request.
Also update docs, according the source code, the default
fifo_expire_async is 250ms, and fifo_expire_sync is 125ms.
Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Acked-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
If the platform set the dyn_pcm_assign to true, it will call
hdmi_find_pcm_slot() to find a pcm slot when hdmi/dp monitor is
connected and need to create a pcm.
So far only intel_hsw_common_init() and patch_nvhdmi() set the
dyn_pcm_assign to true, here we let tgl platforms assign the pcm slot
dynamically first, if the driver runs for a period of time and there
is no regression reported, we could set no_fixed_assgin to true in
the intel_hsw_common_init(), and then set it to true in the
patch_nvhdmi().
This change comes from the discussion between Takashi and
Kai Vehmanen. Please refer to:
https://github.com/alsa-project/alsa-lib/pull/118
Suggested-and-reviewed-by: Takashi Iwai <tiwai@suse.de>
Suggested-and-reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Hui Wang <hui.wang@canonical.com>
Link: https://lore.kernel.org/r/20210301111202.2684-1-hui.wang@canonical.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
