[MODERATED] Re: [PATCH 0/2] more sampling fun 0

Sorry for the partial sequence.  I'm not sure where the problem is and will
follow up with IT to see if its on my end.

--mark

On Wed, Feb 19, 2020 at 02:45:22PM -0800, speck for mark gross wrote:
> From: mark gross <[email protected]>
> Subject: [PATCH 0/2] Special Register Buffer Data Sampling patch set 
> 
> Special Register Buffer Data Sampling is a sampling type of vulnerability that
> leaks data across cores sharing the HW-RNG for vulnerable processors.
> 
> This leak is fixed by a microcode update and is enabled by default.
> 
> This new microcode serializes processor access during execution of RDRAND
> or RDSEED. It ensures that the shared buffer is overwritten before it
> is released for reuse.
> 
> The mitigation impacts the throughput of the RDRAND and RDSEED instructions
> and latency of RT processing running on the socket while executing RDRAND or
> RDSEED.  The micro bechmark of calling RDRAND many times shows a 10x slowdown.
> 
> This patch set enables kernel command line control of this mitigation and
> exports vulnerability and mitigation status.
> 
> This patch set includes 2 patches:
> The first patch updates cpu_vuln_whitelist with support for a 16 bit field for
> enumerating based on stepping as well as vendor, family, model.
> 
> The second patch enables the command line control of the mitigation as well as
> the sysfs export of vulnerability status.
> 
> The documentation patch is pending on the official white paper to be complete
> such that I can make sure the in tree documentation is consistent with the
> white paper.
> 
> The microcode defaults to enabling the mitigation.
> 
> mark gross (2):
>   Add capability to specify a range of steppings in the vulnerability
>     white list structure.
>   WIP SRBDS mitigation enabling.
> 
>  arch/x86/include/asm/cpu_device_id.h | 12 ++++
>  arch/x86/include/asm/cpufeatures.h   |  3 +
>  arch/x86/include/asm/msr-index.h     |  4 ++
>  arch/x86/kernel/cpu/bugs.c           | 84 ++++++++++++++++++++++++++++
>  arch/x86/kernel/cpu/common.c         | 52 ++++++++++++-----
>  arch/x86/kernel/cpu/cpu.h            | 10 ++++
>  arch/x86/kernel/cpu/intel.c          |  2 +
>  arch/x86/kernel/cpu/match.c          | 26 +++++++++
>  drivers/base/cpu.c                   |  8 +++
>  9 files changed, 187 insertions(+), 14 deletions(-)
> 
> -- 
> 2.17.1