[02/18] arm64: mm: Temporarily disable ARM64_SW_TTBR0_PAN

Message ID	1510942921-12564-3-git-send-email-will.deacon@arm.com
State	Superseded
Headers	show Delivered-To: patch@linaro.org Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; From: Will Deacon <will.deacon@arm.com> To: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, catalin.marinas@arm.com, mark.rutland@arm.com, ard.biesheuvel@linaro.org, sboyd@codeaurora.org, dave.hansen@linux.intel.com, keescook@chromium.org, Will Deacon <will.deacon@arm.com> Subject: [PATCH 02/18] arm64: mm: Temporarily disable ARM64_SW_TTBR0_PAN Date: Fri, 17 Nov 2017 18:21:45 +0000 Message-Id: <1510942921-12564-3-git-send-email-will.deacon@arm.com> In-Reply-To: <1510942921-12564-1-git-send-email-will.deacon@arm.com> References: <1510942921-12564-1-git-send-email-will.deacon@arm.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk
Series	arm64: Unmap the kernel whilst running in userspace (KAISER) \| expand [00/18] arm64: Unmap the kernel whilst running in userspace (KAISER) [01/18] arm64: mm: Use non-global mappings for kernel space [02/18] arm64: mm: Temporarily disable ARM64_SW_TTBR0_PAN [03/18] arm64: mm: Move ASID from TTBR0 to TTBR1 [04/18] arm64: mm: Remove pre_ttbr0_update_workaround for Falkor erratum #E1003 [05/18] arm64: mm: Rename post_ttbr0_update_workaround [06/18] arm64: mm: Fix and re-enable ARM64_SW_TTBR0_PAN [07/18] arm64: mm: Allocate ASIDs in pairs [08/18] arm64: mm: Add arm64_kernel_mapped_at_el0 helper using static key [09/18] arm64: mm: Invalidate both kernel and user ASIDs when performing TLBI [10/18] arm64: entry: Add exception trampoline page for exceptions from EL0 [11/18] arm64: mm: Map entry trampoline into trampoline and kernel page tables [12/18] arm64: entry: Explicitly pass exception level to kernel_ventry macro [13/18] arm64: entry: Hook up entry trampoline to exception vectors [14/18] arm64: erratum: Work around Falkor erratum #E1003 in trampoline code [15/18] arm64: tls: Avoid unconditional zeroing of tpidrro_el0 for native tasks [16/18] arm64: entry: Add fake CPU feature for mapping the kernel at EL0 [17/18] arm64: makefile: Ensure TEXT_OFFSET doesn't overlap with trampoline [18/18] arm64: Kconfig: Add CONFIG_UNMAP_KERNEL_AT_EL0

Message ID

1510942921-12564-3-git-send-email-will.deacon@arm.com

State

Superseded

Headers

Received-SPF: pass (google.com: best guess record for domain of
	linux-kernel-owner@vger.kernel.org designates 209.132.180.67
	as permitted sender) client-ip=209.132.180.67; 
From: Will Deacon <will.deacon@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org, catalin.marinas@arm.com,
	mark.rutland@arm.com, ard.biesheuvel@linaro.org,
	sboyd@codeaurora.org, dave.hansen@linux.intel.com,
	keescook@chromium.org, Will Deacon <will.deacon@arm.com>
Subject: [PATCH 02/18] arm64: mm: Temporarily disable ARM64_SW_TTBR0_PAN
Date: Fri, 17 Nov 2017 18:21:45 +0000
Message-Id: <1510942921-12564-3-git-send-email-will.deacon@arm.com>
In-Reply-To: <1510942921-12564-1-git-send-email-will.deacon@arm.com>
References: <1510942921-12564-1-git-send-email-will.deacon@arm.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Series

arm64: Unmap the kernel whilst running in userspace (KAISER) | expand

Commit Message

Will Deacon Nov. 17, 2017, 6:21 p.m. UTC

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.

Signed-off-by: Will Deacon <will.deacon@arm.com>

---
 arch/arm64/Kconfig | 1 +
 1 file changed, 1 insertion(+)

-- 
2.1.4

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 0df64a6a56d4..582bbd77c390 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -872,6 +872,7 @@  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

[02/18] arm64: mm: Temporarily disable ARM64_SW_TTBR0_PAN

Commit Message

Patch