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3d7d72a34e
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Jack Wang 3d7d72a34e x86/sgx: Break up long non-preemptible delays in sgx_vepc_release() 
On large enclaves we hit the softlockup warning with following call trace:

	xa_erase()
	sgx_vepc_release()
	__fput()
	task_work_run()
	do_exit()

The latency issue is similar to the one fixed in:

  8795359e35 ("x86/sgx: Silence softlockup detection when releasing large enclaves")

The test system has 64GB of enclave memory, and all is assigned to a single VM.
Release of 'vepc' takes a longer time and causes long latencies, which triggers
the softlockup warning.

Add cond_resched() to give other tasks a chance to run and reduce
latencies, which also avoids the softlockup detector.

[ mingo: Rewrote the changelog. ]

Fixes: 540745ddbc ("x86/sgx: Introduce virtual EPC for use by KVM guests")
Reported-by: Yu Zhang <yu.zhang@ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Yu Zhang <yu.zhang@ionos.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Acked-by: Haitao Huang <haitao.huang@linux.intel.com>
Cc: stable@vger.kernel.org
2023-09-06 23:55:09 +02:00
arch x86/sgx: Break up long non-preemptible delays in sgx_vepc_release() 2023-09-06 23:55:09 +02:00
block for-6.6/block-2023-08-28 2023-08-29 20:21:42 -07:00
certs certs: Reference revocation list for all keyrings 2023-08-17 20:12:41 +00:00
crypto This update includes the following changes: 2023-08-29 11:23:29 -07:00
Documentation Add x86 shadow stack support 2023-08-31 12:20:12 -07:00
drivers nvdimm changes for v6.6 merge window 2023-08-30 20:52:08 -07:00
fs Add x86 shadow stack support 2023-08-31 12:20:12 -07:00
include Add x86 shadow stack support 2023-08-31 12:20:12 -07:00
init - An extensive rework of kexec and crash Kconfig from Eric DeVolder 2023-08-29 14:53:51 -07:00
io_uring for-6.6/io_uring-2023-08-28 2023-08-29 20:11:33 -07:00
ipc Add x86 shadow stack support 2023-08-31 12:20:12 -07:00
kernel Add x86 shadow stack support 2023-08-31 12:20:12 -07:00
lib This pull request is full of clk driver changes. In fact, there aren't any 2023-08-30 19:53:39 -07:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm Add x86 shadow stack support 2023-08-31 12:20:12 -07:00
net for-6.6/io_uring-2023-08-28 2023-08-29 20:11:33 -07:00
rust Documentation work keeps chugging along; stuff for 6.6 includes: 2023-08-30 20:05:42 -07:00
samples VFIO updates for v6.6-rc1 2023-08-30 20:36:01 -07:00
scripts x86: Remove the arch_calc_vm_prot_bits() macro from the UAPI 2023-09-06 23:50:46 +02:00
security Smack updates for v6.6. Two minor fixes. 2023-08-30 09:28:07 -07:00
sound sound updates for 6.6-rc1 2023-08-30 13:45:05 -07:00
tools selftests/x86: Update map_shadow_stack syscall nr 2023-09-01 23:34:13 +02:00
usr initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP 2023-06-06 17:54:49 +09:00
virt VFIO updates for v6.6-rc1 2023-08-30 20:36:01 -07:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore Revert ".gitignore: ignore *.cover and *.mbx" 2023-07-04 15:05:12 -07:00
.mailmap mailmap: add entries for Simon Horman 2023-08-16 09:53:10 +01:00
.rustfmt.toml
COPYING
CREDITS - Address -Wmissing-prototype warnings 2023-06-26 16:43:54 -07:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig
MAINTAINERS VFIO updates for v6.6-rc1 2023-08-30 20:36:01 -07:00
Makefile Rust changes for v6.6 2023-08-29 08:19:46 -07:00
README

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.