freebsd-nq/sys/x86
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 Call acpi_pxm_set_proximity_info() slightly earlier on x86. 2020-05-14 16:07:27 +00:00
bios Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (17 of many) 2020-02-26 14:26:36 +00:00
conf Floppy driver really only works on x86 2019-08-12 22:58:50 +00:00
cpufreq Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (17 of many) 2020-02-26 14:26:36 +00:00
include Control for Special Register Buffer Data Sampling mitigation. 2020-06-12 22:14:45 +00:00
iommu Rename dmar_get_dma_tag() to acpi_iommu_get_dma_tag(). 2020-05-26 16:40:40 +00:00
isa Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (17 of many) 2020-02-26 14:26:36 +00:00
pci Add pci_early function to detect Intel stolen memory. 2018-10-31 23:17:00 +00:00
x86 Control for Special Register Buffer Data Sampling mitigation. 2020-06-12 22:14:45 +00:00
xen xenpv: do not use low 1MB for Xen mappings on i386 2020-05-28 08:18:34 +00:00