freebsd-dev/sys/amd64
Konstantin Belousov 17edf152e5 Control for Special Register Buffer Data Sampling mitigation.
New microcode update for Intel enables mitigation for SRBDS, which
slows down RDSEED and related instructions.  The update also provides
a control to limit the mitigation to SGX enclaves, which should
restore the speed of random generator by the cost of potential
cross-core bufer sampling.

See https://software.intel.com/security-software-guidance/insights/deep-dive-special-register-buffer-data-sampling

GIve the user control over it.

Reviewed by:	markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D25221
2020-06-12 22:14:45 +00:00
..
acpica Merge ACPICA 20190329. 2019-03-29 20:21:28 +00:00
amd64 Control for Special Register Buffer Data Sampling mitigation. 2020-06-12 22:14:45 +00:00
cloudabi32 Use uintptr_t instead of register_t * for the stack base. 2019-12-03 23:17:54 +00:00
cloudabi64 Use uintptr_t instead of register_t * for the stack base. 2019-12-03 23:17:54 +00:00
conf ice(4): Introduce new driver for Intel E800 Ethernet controllers 2020-05-26 23:35:10 +00:00
ia32 Make ps_strings in struct image_params into a pointer. 2020-04-15 20:21:30 +00:00
include vmm(4): Add 12 user ABI compat after r349948 2020-05-20 17:27:54 +00:00
linux Handle getcpu() calls in vsyscall emulation on amd64. 2020-05-31 18:20:20 +00:00
linux32 Convert canary, execpathp, and pagesizes to pointers. 2020-04-16 21:53:17 +00:00
pci pci_cfgreg.c: Use io port config access for early boot time. 2019-04-09 18:07:17 +00:00
sgx Fix a few places that free a page from an object without busy held. This is 2019-12-02 22:42:05 +00:00
vmm vmm(4): Add 12 user ABI compat after r349948 2020-05-20 17:27:54 +00:00
Makefile