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/freebsd/sys/dev/cpuctl/
H A Dcpuctl.cdiff 17edf152e556ec1bcbcdce2d34e1f1612f198d1e Sat Jun 13 00:14:45 CEST 2020 Konstantin Belousov <kib@FreeBSD.org> 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
/freebsd/sys/x86/include/
H A Dx86_var.hdiff 17edf152e556ec1bcbcdce2d34e1f1612f198d1e Sat Jun 13 00:14:45 CEST 2020 Konstantin Belousov <kib@FreeBSD.org> 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
/freebsd/sys/x86/x86/
H A Dcpu_machdep.cdiff 17edf152e556ec1bcbcdce2d34e1f1612f198d1e Sat Jun 13 00:14:45 CEST 2020 Konstantin Belousov <kib@FreeBSD.org> 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
/freebsd/share/man/man7/
H A Dsecurity.7diff 17edf152e556ec1bcbcdce2d34e1f1612f198d1e Sat Jun 13 00:14:45 CEST 2020 Konstantin Belousov <kib@FreeBSD.org> 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
/freebsd/sys/amd64/amd64/
H A Dinitcpu.cdiff 17edf152e556ec1bcbcdce2d34e1f1612f198d1e Sat Jun 13 00:14:45 CEST 2020 Konstantin Belousov <kib@FreeBSD.org> 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
H A Dmachdep.cdiff 17edf152e556ec1bcbcdce2d34e1f1612f198d1e Sat Jun 13 00:14:45 CEST 2020 Konstantin Belousov <kib@FreeBSD.org> 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