APPLIED: [PATCH][Eoan] UBUNTU: [Config] Disable CONFIG_ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT

[Seth Forshee]

On Wed, Oct 02, 2019 at 12:37:47PM -0600, dann frazier wrote:
> BugLink: https://bugs.launchpad.net/bugs/1845820
> 
> Avoid a regression on ThunderX - and likely other systems - that
> causes peripherals to break due to a misconfigured IOMMU. This disables
> a temporary config option provided by upstream to intentionally break
> systems that require the less secure passthrough mode. It's too late
> in the cycle to fix ThunderX properly and, since this is a new config
> in this Ubuntu release, disabling it does not introduce a security
> regression from previous releases.
> 
> As per commit 954a03be ("iommu/arm-smmu: Break insecure users by disabling
> bypass by default"), this config will eventually be removed upstream, so
> Ubuntu will drop this workaround via a normal rebase, if not before.
> 
> Signed-off-by: dann frazier <dann.frazier at canonical.com>

Applied to eoan/master-next, thanks!