Simplify drmfront's ring creation and removal via xenbus_setup_ring()
and xenbus_teardown_ring().
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Tested-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> # Arm64 only
Signed-off-by: Juergen Gross <jgross@suse.com>

Simplify tpmfront's ring creation and removal via xenbus_setup_ring()
and xenbus_teardown_ring(), which are provided exactly for the use
pattern as seen in this driver.
Signed-off-by: Juergen Gross <jgross@suse.com>

Simplify netfront's ring creation and removal via xenbus_setup_ring()
and xenbus_teardown_ring().
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

Simplify blkfront's ring creation and removal via xenbus_setup_ring()
and xenbus_teardown_ring().
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

Most PV device frontends share very similar code for setting up shared
ring buffers:

- allocate page(s)
- init the ring admin data
- give the backend access to the ring via grants

Tearing down the ring requires similar actions in all frontends again:

- remove grants
- free the page(s)

Provide service functions xenbus_setup_ring() and xenbus_teardown_ring()
for that purpose.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

Update include/xen/interface/io/ring.h to its newest version.

Switch the two improper use cases of RING_HAS_UNCONSUMED_RESPONSES() to
XEN_RING_NR_UNCONSUMED_RESPONSES() in order to avoid the nasty
XEN_RING_HAS_UNCONSUMED_IS_BOOL #define.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

Instead of using a private macro for an invalid grant reference use
the common one.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Tested-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> # Arm64 only
Signed-off-by: Juergen Gross <jgross@suse.com>

Instead of using a private macro for an invalid grant reference use
the common one.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

Instead of using a private macro for an invalid grant reference use
the common one.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Tested-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> # Arm64 only
Signed-off-by: Juergen Gross <jgross@suse.com>

Instead of using a private macro for an invalid grant reference use
the common one.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Tested-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> # Arm64 only
Signed-off-by: Juergen Gross <jgross@suse.com>

Instead of using a private macro for an invalid grant reference use
the common one.
Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Juergen Gross <jgross@suse.com>

GRANT_INVALID_REF isn't used in scsifront, so remove it.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

Instead of using a private macro for an invalid grant reference use
the common one.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

Instead of using a private macro for an invalid grant reference use
the common one.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

Make sure a reserved grant is never put on the free list, as this could
cause hard to debug errors.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

Update include/xen/interface/grant_table.h to its newest version.

This allows to drop some private definitions in grant-table.c and
include/xen/grant_table.h.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

Instead of relying on a well behaved PV scsi backend verify all meta
data received from the backend and avoid multiple reads of the same
data from the shared ring page.

In case any illegal data from the backend is detected switch the
PV device to a new "error" state and deactivate it for further use.

Use the "lateeoi" variant for the event channel in order to avoid
event storms blocking the guest.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/20220428075323.12853-5-jgross@suse.comSigned-off-by: Juergen Gross <jgross@suse.com>

Add a translation layer for the command result values.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/20220428075323.12853-4-jgross@suse.comSigned-off-by: Juergen Gross <jgross@suse.com>

Instead of using the kernel's values for the result of PV scsi
operations use the values of the interface definition.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/20220428075323.12853-3-jgross@suse.comSigned-off-by: Juergen Gross <jgross@suse.com>

Update include/xen/interface/io/vscsiif.h to its newest version.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/20220428075323.12853-2-jgross@suse.comSigned-off-by: Juergen Gross <jgross@suse.com>

Merge tag 'driver-core-5.18-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core fixes from Greg KH:
 "Here is one fix, and three documentation updates for 5.18-rc7.

  The fix is for the firmware loader which resolves a long-reported
  problem where the credentials of the firmware loader could be set to a
  userspace process without enough permissions to actually load the
  firmware image. Many Android vendors have been reporting this for
  quite some time.

  The documentation updates are for the embargoed-hardware-issues.rst
  file to add a new entry, change an existing one, and sort the list to
  make changes easier in the future.

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'driver-core-5.18-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  Documentation/process: Update ARM contact for embargoed hardware issues
  Documentation/process: Add embargoed HW contact for Ampere Computing
  Documentation/process: Make groups alphabetical and use tabs consistently
  firmware_loader: use kernel credentials when reading firmware

Pull char/misc driver fixes from Greg KH:
 "Here are two small driver fixes for 5.18-rc7 that resolve reported
  problems:

   - slimbus driver irq bugfix

   - interconnect sync state bugfix

  Both of these have been in linux-next with no reported problems"

* tag 'char-misc-5.18-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  slimbus: qcom: Fix IRQ check in qcom_slim_probe
  interconnect: Restore sync state by ignoring ipa-virt in provider count

Pull tty/serial driver fixes from Greg KH:
 "Here are some small tty n_gsm and serial driver fixes for 5.18-rc7
  that resolve reported problems. They include:

   - n_gsm fixes for reported issues

   - 8250_mtk driver fixes for some platforms

   - fsl_lpuart driver fix for reported problem.

   - digicolor driver fix for reported problem.

  All have been in linux-next for a while with no reported problems"

* tag 'tty-5.18-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  fsl_lpuart: Don't enable interrupts too early
  tty: n_gsm: fix invalid gsmtty_write_room() result
  tty: n_gsm: fix mux activation issues in gsm_config()
  tty: n_gsm: fix buffer over-read in gsm_dlci_data()
  serial: 8250_mtk: Fix register address for XON/XOFF character
  serial: 8250_mtk: Make sure to select the right FEATURE_SEL
  serial: 8250_mtk: Fix UART_EFR register address
  tty/serial: digicolor: fix possible null-ptr-deref in digicolor_uart_probe()

Pull USB fixes from Greg KH:
 "Here are some small fixes for reported issues with some USB drivers.
  They include:

   - xhci fixes for xhci-mtk platform driver

   - typec driver fixes for reported problems.

   - cdc-wdm read-stuck fix

   - gadget driver fix for reported race condition

   - new usb-serial driver ids

  All of these have been in linux-next with no reported problems"

* tag 'usb-5.18-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
  usb: xhci-mtk: remove bandwidth budget table
  usb: xhci-mtk: fix fs isoc's transfer error
  usb: gadget: fix race when gadget driver register via ioctl
  usb: typec: tcpci_mt6360: Update for BMC PHY setting
  usb: gadget: uvc: allow for application to cleanly shutdown
  usb: typec: tcpci: Don't skip cleanup in .remove() on error
  usb: cdc-wdm: fix reading stuck on device close
  USB: serial: qcserial: add support for Sierra Wireless EM7590
  USB: serial: option: add Fibocom MA510 modem
  USB: serial: option: add Fibocom L610 modem
  USB: serial: pl2303: add device id for HP LM930 Display

Pull powerpc fix from Michael Ellerman:

 - Fix KVM PR on 32-bit, which was broken by some MMU code refactoring.

Thanks to: Alexander Graf, and Matt Evans.

* tag 'powerpc-5.18-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  KVM: PPC: Book3S PR: Enable MSR_DR for switch_mmu_context()

Pull x86 fix from Thomas Gleixner:
 "A single fix for the handling of unpopulated sub-pmd spaces.

  The copy & pasta from the corresponding s390 code screwed up the
  address calculation for marking the sub-pmd ranges via memset by
  omitting the ALIGN_DOWN() to calculate the proper start address.

  It's a mystery why this code is not generic and shared because there
  is nothing architecture specific in there, but that's too intrusive
  for a backportable fix"

* tag 'x86-urgent-2022-05-15' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mm: Fix marking of unused sub-pmd ranges

Pull scheduler fix from Thomas Gleixner:
 "The recent expansion of the sched switch tracepoint inserted a new
  argument in the middle of the arguments. This reordering broke BPF
  programs which relied on the old argument list.

  While tracepoints are not considered stable ABI, it's not trivial to
  make BPF cope with such a change, but it's being worked on. For now
  restore the original argument order and move the new argument to the
  end of the argument list"

* tag 'sched-urgent-2022-05-15' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/tracing: Append prev_state to tp args instead

Pull irq fix from Thomas Gleixner:
 "A single fix for a recent (introduced in 5.16) regression in the core
  interrupt code.

  The consolidation of the interrupt handler invocation code added an
  unconditional warning when generic_handle_domain_irq() is invoked from
  outside hard interrupt context. That's overbroad as the requirement
  for invoking these handlers in hard interrupt context is only required
  for certain interrupt types. The subsequently called code already
  contains a warning which triggers conditionally for interrupt chips
  which indicate this requirement in their properties.

  Remove the overbroad one"

* tag 'irq-urgent-2022-05-15' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  genirq: Remove WARN_ON_ONCE() in generic_handle_domain_irq()

Merge tag 'perf-tools-fixes-for-v5.18-2022-05-14' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux

Pull perf tools fixes from Arnaldo Carvalho de Melo:

 - Fix two NDEBUG warnings in 'perf bench numa'

 - Fix ARM coresight `perf test` failure

 - Sync linux/kvm.h with the kernel sources

 - Add James and Mike as Arm64 performance events reviewers

* tag 'perf-tools-fixes-for-v5.18-2022-05-14' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux:
  MAINTAINERS: Add James and Mike as Arm64 performance events reviewers
  tools headers UAPI: Sync linux/kvm.h with the kernel sources
  perf tests: Fix coresight `perf test` failure.
  perf bench: Fix two numa NDEBUG warnings

Pull more drm fixes from Dave Airlie:
 "Turns out I was right, some fixes hadn't made it to me yet. The vmwgfx
  ones also popped up later, but all seem like bad enough things to fix.
  The dma-buf, vc4 and nouveau ones are all pretty small.

  The fbdev fixes are a bit more complicated: a fix to cleanup fbdev
  devices properly, uncovered some use-after-free bugs in existing
  drivers. Then the fix for those bugs wasn't correct. This reverts that
  fix, and puts the proper fixes in place in the drivers to avoid the
  use-after-frees.

  This has had a fair number of eyes on it at this stage, and I'm
  confident enough that it puts things in the right place, and is less
  dangerous than reverting our way out of the initial change at this
  stage.

  fbdev:
   - revert NULL deref fix that turned into a use-after-free
   - prevent use-after-free in fbdev
   - efifb/simplefb/vesafb: fix cleanup paths to avoid use-after-frees

  dma-buf:
   - fix panic in stats setup

  vc4:
   - fix hdmi build

  nouveau:
   - tegra iommu present fix
   - fix leak in backlight name

  vmwgfx:
   - Black screen due to fences using FIFO checks on SVGA3
   - Random black screens on boot due to uninitialized drm_mode_fb_cmd2
   - Hangs on SVGA3 due to command buffers being used with gbobjects"

* tag 'drm-fixes-2022-05-14' of git://anongit.freedesktop.org/drm/drm:
  drm/vmwgfx: Disable command buffers on svga3 without gbobjects
  drm/vmwgfx: Initialize drm_mode_fb_cmd2
  drm/vmwgfx: Fix fencing on SVGAv3
  drm/vc4: hdmi: Fix build error for implicit function declaration
  dma-buf: call dma_buf_stats_setup after dmabuf is in valid list
  fbdev: efifb: Fix a use-after-free due early fb_info cleanup
  drm/nouveau: Fix a potential theorical leak in nouveau_get_backlight_name()
  drm/nouveau/tegra: Stop using iommu_present()
  fbdev: vesafb: Cleanup fb_info in .fb_destroy rather than .remove
  fbdev: efifb: Cleanup fb_info in .fb_destroy rather than .remove
  fbdev: simplefb: Cleanup fb_info in .fb_destroy rather than .remove
  fbdev: Prevent possible use-after-free in fb_release()
  Revert "fbdev: Make fb_release() return -ENODEV if fbdev was unregistered"

Multiple fixes to fbdev to address a regression at unregistration, an
iommu detection improvement for nouveau, a memory leak fix for nouveau,
pointer dereference fix for dma_buf_file_release(), and a build breakage
fix for vc4
Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20220513073044.ymayac7x7bzatrt7@houat

Merge tag 'vmwgfx-drm-fixes-5.18-2022-05-13' of https://gitlab.freedesktop.org/zack/vmwgfx into drm-fixes

vmwgfx fixes for:
- Black screen due to fences using FIFO checks on SVGA3
- Random black screens on boot due to uninitialized drm_mode_fb_cmd2
- Hangs on SVGA3 due to command buffers being used with gbobjects
Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Zack Rusin <zackr@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/a1d32799e4c74b8540216376d7576bb783ca07ba.camel@vmware.com

Pull gfs2 fixes from Andreas Gruenbacher:
 "We've finally identified commit dc732906 ("gfs2: Introduce flag
  for glock holder auto-demotion") to be the other cause of the
  filesystem corruption we've been seeing. This feature isn't strictly
  necessary anymore, so we've decided to stop using it for now.

  With this and the gfs_iomap_end rounding fix you've already seen
  ("gfs2: Fix filesystem block deallocation for short writes" in this
  pull request), we're corruption free again now.

   - Fix filesystem block deallocation for short writes.

   - Stop using glock holder auto-demotion for now.

   - Get rid of buffered writes inefficiencies due to page faults being
     disabled.

   - Minor other cleanups"

* tag 'gfs2-v5.18-rc4-fix3' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2:
  gfs2: Stop using glock holder auto-demotion for now
  gfs2: buffered write prefaulting
  gfs2: Align read and write chunks to the page cache
  gfs2: Pull return value test out of should_fault_in_pages
  gfs2: Clean up use of fault_in_iov_iter_{read,write}able
  gfs2: Variable rename
  gfs2: Fix filesystem block deallocation for short writes

We're having unresolved issues with the glock holder auto-demotion mechanism
introduced in commit dc732906.  This mechanism was assumed to be essential
for avoiding frequent short reads and writes until commit 296abc0d
("gfs2: No short reads or writes upon glock contention").  Since then,
when the inode glock is lost, it is simply re-acquired and the operation
is resumed.  This means that apart from the performance penalty, we
might as well drop the inode glock before faulting in pages, and
re-acquire it afterwards.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

In gfs2_file_buffered_write, to increase the likelihood that all the
user memory we're trying to write will be resident in memory, carry out
the write in chunks and fault in each chunk of user memory before trying
to write it.  Otherwise, some workloads will trigger frequent short
"internal" writes, causing filesystem blocks to be allocated and then
partially deallocated again when writing into holes, which is wasteful
and breaks reservations.

Neither the chunked writes nor any of the short "internal" writes are
user visible.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

Pull SCSI fixes from James Bottomley:
 "Four fixes, all in drivers.

  These patches mosly fix error legs and exceptional conditions
  (scsi_dh_alua, qla2xxx). The lpfc fixes are for coding issues with
  lpfc features"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: lpfc: Correct BDE DMA address assignment for GEN_REQ_WQE
  scsi: lpfc: Fix split code for FLOGI on FCoE
  scsi: qla2xxx: Fix missed DMA unmap for aborted commands
  scsi: scsi_dh_alua: Properly handle the ALUA transitioning state

Align the chunks that reads and writes are carried out in to the page
cache rather than the user buffers.  This will be more efficient in
general, especially for allocating writes.  Optimizing the case that the
user buffer is gfs2 backed isn't very useful; we only need to make sure
we won't deadlock.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

Pull the return value test of the previous read or write operation out
of should_fault_in_pages().  In a following patch, we'll fault in pages
before the I/O and there will be no return value to check.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

No need to store the return value of the fault_in functions in separate
variables.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>