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Gavin Shan b3557a3697 KVM: selftests: Clear dirty ring states between two modes in dirty_log_test 
[ Upstream commit 7167190ddb ]

There are two states, which need to be cleared before next mode
is executed. Otherwise, we will hit failure as the following messages
indicate.

- The variable 'dirty_ring_vcpu_ring_full' shared by main and vcpu
  thread. It's indicating if the vcpu exit due to full ring buffer.
  The value can be carried from previous mode (VM_MODE_P40V48_4K) to
  current one (VM_MODE_P40V48_64K) when VM_MODE_P40V48_16K isn't
  supported.

- The current ring buffer index needs to be reset before next mode
  (VM_MODE_P40V48_64K) is executed. Otherwise, the stale value is
  carried from previous mode (VM_MODE_P40V48_4K).

  # ./dirty_log_test -M dirty-ring
  Setting log mode to: 'dirty-ring'
  Test iterations: 32, interval: 10 (ms)
  Testing guest mode: PA-bits:40,  VA-bits:48,  4K pages
  guest physical test memory offset: 0xffbfffc000
    :
  Dirtied 995328 pages
  Total bits checked: dirty (1012434), clear (7114123), track_next (966700)
  Testing guest mode: PA-bits:40,  VA-bits:48, 64K pages
  guest physical test memory offset: 0xffbffc0000
  vcpu stops because vcpu is kicked out...
  vcpu continues now.
  Notifying vcpu to continue
  Iteration 1 collected 0 pages
  vcpu stops because dirty ring is full...
  vcpu continues now.
  vcpu stops because dirty ring is full...
  vcpu continues now.
  vcpu stops because dirty ring is full...
  ==== Test Assertion Failure ====
  dirty_log_test.c:369: cleared == count
  pid=10541 tid=10541 errno=22 - Invalid argument
     1	0x0000000000403087: dirty_ring_collect_dirty_pages at dirty_log_test.c:369
     2	0x0000000000402a0b: log_mode_collect_dirty_pages at dirty_log_test.c:492
     3	 (inlined by) run_test at dirty_log_test.c:795
     4	 (inlined by) run_test at dirty_log_test.c:705
     5	0x0000000000403a37: for_each_guest_mode at guest_modes.c:100
     6	0x0000000000401ccf: main at dirty_log_test.c:938
     7	0x0000ffff9ecd279b: ?? ??:0
     8	0x0000ffff9ecd286b: ?? ??:0
     9	0x0000000000401def: _start at ??:?
  Reset dirty pages (0) mismatch with collected (35566)

Fix the issues by clearing 'dirty_ring_vcpu_ring_full' and the ring
buffer index before next new mode is to be executed.

Signed-off-by: Gavin Shan <gshan@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221110104914.31280-7-gshan@redhat.com
Stable-dep-of: ba58f873cd ("KVM: selftests: Fix a semaphore imbalance in the dirty ring logging test")
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2024-02-23 09:12:30 +01:00
arch work around gcc bugs with 'asm goto' with outputs 2024-02-23 09:12:28 +01:00
block block: treat poll queue enter similarly to timeouts 2024-02-16 19:06:31 +01:00
certs certs: Fix build error when PKCS#11 URI contains semicolon 2023-02-09 11:28:11 +01:00
crypto crypto: api - Disallow identical driver names 2024-01-31 16:16:58 -08:00
Documentation net: sysfs: Fix /sys/class/net/<iface> path 2024-02-05 20:13:02 +00:00
drivers of: unittest: Fix compile in the non-dynamic case 2024-02-23 09:12:29 +01:00
fs btrfs: don't drop extent_map for free space inode on write error 2024-02-23 09:12:29 +01:00
include update workarounds for gcc "asm goto" issue 2024-02-23 09:12:28 +01:00
init update workarounds for gcc "asm goto" issue 2024-02-23 09:12:28 +01:00
io_uring io_uring/net: fix sr->len for IORING_OP_RECV with MSG_WAITALL and buffers 2024-02-16 19:06:30 +01:00
ipc ipc: fix memory leak in init_mqueue_fs() 2022-12-31 13:32:01 +01:00
kernel clocksource: Skip watchdog check for large watchdog intervals 2024-02-16 19:06:31 +01:00
lib debugobjects: Stop accessing objects after releasing hash bucket lock 2024-02-05 20:12:47 +00:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm mm: page_alloc: unreserve highatomic page blocks before oom 2024-01-31 16:17:03 -08:00
net work around gcc bugs with 'asm goto' with outputs 2024-02-23 09:12:28 +01:00
rust rust: allocator: Prevent mis-aligned allocation 2023-08-11 12:08:18 +02:00
samples work around gcc bugs with 'asm goto' with outputs 2024-02-23 09:12:28 +01:00
scripts scripts/get_abi: fix source path leak 2024-01-31 16:17:01 -08:00
security lsm: new security_file_ioctl_compat() hook 2024-01-31 16:17:00 -08:00
sound ALSA: usb-audio: Sort quirk table entries 2024-02-16 19:06:31 +01:00
tools KVM: selftests: Clear dirty ring states between two modes in dirty_log_test 2024-02-23 09:12:30 +01:00
usr usr/gen_init_cpio.c: remove unnecessary -1 values from int file 2022-10-03 14:21:44 -07:00
virt kvm/vfio: ensure kvg instance stays around in kvm_vfio_group_add() 2023-09-13 09:42:46 +02:00
.clang-format inet: ping: use hlist_nulls rcu iterator during lookup 2022-12-01 12:42:46 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore Kbuild: add Rust support 2022-09-28 09:02:20 +02:00
.mailmap 9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address 2022-12-10 17:10:52 -08:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Remove Michal Marek from Kbuild maintainers 2022-11-16 14:53:00 +09:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS genirq/affinity: Move group_cpus_evenly() into lib/ 2024-01-10 17:10:33 +01:00
Makefile Linux 6.1.78 2024-02-16 19:06:32 +01:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.