AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-12-15 07:46:43 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity
049331f277
linux_dsm_epyc7002/arch/x86/entry
History
Thomas Gleixner 049331f277 x86/fsgsbase: Revert FSGSBASE support 
The FSGSBASE series turned out to have serious bugs and there is still an
open issue which is not fully understood yet.

The confidence in those changes has become close to zero especially as the
test cases which have been shipped with that series were obviously never
run before sending the final series out to LKML.

  ./fsgsbase_64 >/dev/null
  Segmentation fault

As the merge window is close, the only sane decision is to revert FSGSBASE
support. The revert is necessary as this branch has been merged into
perf/core already and rebasing all of that a few days before the merge
window is not the most brilliant idea.

I could definitely slap myself for not noticing the test case fail when
merging that series, but TBH my expectations weren't that low back
then. Won't happen again.

Revert the following commits:
539bca535d ("x86/entry/64: Fix and clean up paranoid_exit")
2c7b5ac5d5 ("Documentation/x86/64: Add documentation for GS/FS addressing mode")
f987c955c7 ("x86/elf: Enumerate kernel FSGSBASE capability in AT_HWCAP2")
2032f1f96e ("x86/cpu: Enable FSGSBASE on 64bit by default and add a chicken bit")
5bf0cab60e ("x86/entry/64: Document GSBASE handling in the paranoid path")
708078f657 ("x86/entry/64: Handle FSGSBASE enabled paranoid entry/exit")
79e1932fa3 ("x86/entry/64: Introduce the FIND_PERCPU_BASE macro")
1d07316b13 ("x86/entry/64: Switch CR3 before SWAPGS in paranoid entry")
f60a83df45 ("x86/process/64: Use FSGSBASE instructions on thread copy and ptrace")
1ab5f3f7fe ("x86/process/64: Use FSBSBASE in switch_to() if available")
a86b462513 ("x86/fsgsbase/64: Enable FSGSBASE instructions in helper functions")
8b71340d70 ("x86/fsgsbase/64: Add intrinsics for FSGSBASE instructions")
b64ed19b93 ("x86/cpu: Add 'unsafe_fsgsbase' to enable CR4.FSGSBASE")

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Chang S. Bae <chang.seok.bae@intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ravi Shankar <ravi.v.shankar@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
2019-07-03 16:35:23 +02:00
..
syscalls uapi, x86: Fix the syscall numbering of the mount API syscalls [ver #2] 2019-05-16 12:23:45 -04:00
vdso treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 223 2019-05-30 11:29:55 -07:00
vsyscall treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 180 2019-05-30 11:29:20 -07:00
calling.h x86/fsgsbase: Revert FSGSBASE support 2019-07-03 16:35:23 +02:00
common.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 257 2019-06-05 17:30:27 +02:00
entry_32.S Merge branch 'x86-entry-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-05-06 15:55:15 -07:00
entry_64_compat.S x86/entry/64/compat: Fix stack switching for XEN PV 2019-01-18 00:39:33 +01:00
entry_64.S x86/fsgsbase: Revert FSGSBASE support 2019-07-03 16:35:23 +02:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
syscall_32.c syscalls/x86: Unconditionally enable 'struct pt_regs' based syscalls on x86_64 2018-04-05 16:59:38 +02:00
syscall_64.c syscalls/x86: Unconditionally enable 'struct pt_regs' based syscalls on x86_64 2018-04-05 16:59:38 +02:00
thunk_32.S x86: move exports to actual definitions 2016-08-07 23:47:15 -04:00
thunk_64.S x86: move exports to actual definitions 2016-08-07 23:47:15 -04:00