[MODERATED] Re: [PATCH 2/3] V5 more sampling fun 2

On Mon, Apr 06, 2020 at 08:37:56PM +0200, speck for Greg KH wrote:
> On Mon, Apr 06, 2020 at 11:34:17AM -0700, speck for Kees Cook wrote:
> > > +			By default, this issue is mitigated by
> > > +			microcode.  However, the microcode fix can cause
> > > +			the RDRAND and RDSEED instructions to become
> > > +			much slower.  Among other effects, this will
> > > +			result in reduced throughput from /dev/urandom.
> > 
> > This is this true about /dev/urandom? I thought the RDRAND dependency
> > had been removed?
> 
> That dependancy will be removed in 5.7-rc1 and I will be backporting
> that to the stable kernels "soon".
> 

Is that still somee patch pending for the merge window?  I see
Jason Donendfeld's patch to speed up the internal get_random_u32()
and get_random_u64(). But that patch doesn't help /dev/urandom
of the getrandom(2) syscalls.

urandom_read() or SYSCALL_DEFINE3(getrandom)
    urandom_read_nowarn()
	extract_crng_user()
	    extract_crng()
		_extract_crng()
		    arch_get_random_long()

-Tony