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UPSTREAM: arm64: mm: Temporarily disable ARM64_SW_TTBR0_PAN

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We're about to rework the way ASIDs are allocated, switch_mm is
implemented and low-level kernel entry/exit is handled, so keep the
ARM64_SW_TTBR0_PAN code out of the way whilst we do the heavy lifting.

It will be re-enabled in a subsequent patch.

Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Laura Abbott <labbott@redhat.com>
Tested-by: Shanker Donthineni <shankerd@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
(cherry picked from commit 376133b7ed)
Signed-off-by: Todd Poynor <toddpoynor@google.com>

Change-Id: Iac0d096cd8eda5bc2d3cd17d7d2492d1838ad8ed
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Will Deacon
2017-08-10 13:04:48 +01:00
committed by Greg Kroah-Hartman
parent 19d3691ff6
commit dee3b24601
1 changed files with 1 additions and 0 deletions
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arch/arm64/Kconfig
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@@ -802,6 +802,7 @@ endif
config ARM64_SW_TTBR0_PAN
bool "Emulate Privileged Access Never using TTBR0_EL1 switching"
depends on BROKEN # Temporary while switch_mm is reworked
help
Enabling this option prevents the kernel from accessing
user-space memory directly by pointing TTBR0_EL1 to a reserved