Linus Torvalds 0a096f240a A reworked version of the opt-in L1D flush mechanism: ... A stop gap for potential future speculation related hardware vulnerabilities and a mechanism for truly security paranoid applications. It allows a task to request that the L1D cache is flushed when the kernel switches to a different mm. This can be requested via prctl(). Changes vs. the previous versions: - Get rid of the software flush fallback - Make the handling consistent with other mitigations - Kill the task when it ends up on a SMT enabled core which defeats the purpose of L1D flushing obviously -----BEGIN PGP SIGNATURE----- iQJHBAABCgAxFiEEQp8+kY+LLUocC4bMphj1TA10mKEFAmEsn0oTHHRnbHhAbGlu dXRyb25peC5kZQAKCRCmGPVMDXSYoa5fD/47vHGtjAtDr/DaXR1C6F9AvVbKEl8p oNHn8IukE6ts6G4dFH9wUvo/Ut0K3kxX54I+BATew0LTy6tsQeUYh/xjwXMupgNV oKOc9waoqdFvju3ayLFWJmuACLdXpyrGC1j35Aji61zSbR/GdtZ4oDxbuN2YJDAT BTcgKrBM5nQm94JNa083RQSCU5LJxbC7ETkIh6NR73RSPCjUC1Wpxy1sAQAa2MPD 8EzcJ/DjVGaHCI7adX10sz3xdUcyOz7qYz16HpoMGx+oSiq7pGEBtUiK97EYMcrB s+ADFUjYmx/pbEWv2r4c9zxNh7ZV3aLBsWwi7bScHIsv8GjrsA/mYLWskuwOV6BB 22qZjfd0c4raiJwd+nmSx+D2Szv6lZ20gP+krtP2VNC6hUv7ft0VPLySiaFMmUHj quooDZis/W5n+4C9Q8Rk9uUtKzzJOngqW+duftiixHiNQ/ECP/QCAHhZYck/NOkL tZkNj6lJj9+2iR7mhbYROZ+wrYQzRvqNb2pJJQoi/wA0q7wPSKBi3m+51lPsht5W tn94CpaDDZ4IB7Fe1NtcA0UpYJSWpDQGlau4qp92HMCCIcRFfQEm+m9x8axwcj7m ECblHJYBPHuNcCHvPA8kHvr1nd6UUXrGPIo8TK8YhUUbK6pO0OjdNzZX496ia/2g pLzaW2ENTPLbXg== =27wH -----END PGP SIGNATURE----- Merge tag 'x86-cpu-2021-08-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 cache flush updates from Thomas Gleixner: "A reworked version of the opt-in L1D flush mechanism. This is a stop gap for potential future speculation related hardware vulnerabilities and a mechanism for truly security paranoid applications. It allows a task to request that the L1D cache is flushed when the kernel switches to a different mm. This can be requested via prctl(). Changes vs the previous versions: - Get rid of the software flush fallback - Make the handling consistent with other mitigations - Kill the task when it ends up on a SMT enabled core which defeats the purpose of L1D flushing obviously" * tag 'x86-cpu-2021-08-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: Documentation: Add L1D flushing Documentation x86, prctl: Hook L1D flushing in via prctl x86/mm: Prepare for opt-in based L1D flush in switch_mm() x86/process: Make room for TIF_SPEC_L1D_FLUSH sched: Add task_work callback for paranoid L1D flush x86/mm: Refactor cond_ibpb() to support other use cases x86/smp: Add a per-cpu view of SMT state		2021-08-30 15:00:33 -07:00
..
accelerators	Documentation: ocxl.rst: change FPGA indirect article to an	2021-06-09 14:51:25 +02:00
ebpf	docs/bpf: Add bpf() syscall command reference	2021-03-04 18:39:46 -08:00
ioctl	platform-drivers-x86 for v5.14-1	2021-06-30 11:15:39 -07:00
media	media: userspace-api: avoid using ReST :doc:foo markup	2021-06-16 07:26:46 +02:00
index.rst	Add Landlock, a new LSM from Mickaël Salaün <mic@linux.microsoft.com>	2021-05-01 18:50:44 -07:00
iommu.rst	docs: IOMMU user API	2020-10-01 14:52:46 +02:00
landlock.rst	docs: userspace-api: landlock.rst: avoid using ReST :doc:foo markup	2021-06-17 13:24:39 -06:00
no_new_privs.rst	doc: ReSTify no_new_privs.txt	2017-05-18 10:30:09 -06:00
seccomp_filter.rst	Documentation: seccomp: Fix typo in user notification	2021-07-02 10:39:45 -07:00
spec_ctrl.rst	Documentation: Add L1D flushing Documentation	2021-07-28 11:42:25 +02:00
sysfs-platform_profile.rst	Documentation: Add documentation for new platform_profile sysfs attribute	2020-12-30 18:28:57 +01:00
unshare.rst	doc-rst: fix inline emphasis in unshare.rst	2017-05-18 10:23:10 -06:00