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[for,3.12.y,stable,44/63] ARM/ARM64: KVM: Nuke Hyp-mode tlbs before enabling MMU

Message ID 1429853281-6136-45-git-send-email-shannon.zhao@linaro.org
State New
Headers show

Commit Message

Shannon Zhao April 24, 2015, 5:27 a.m. UTC 
From: Pranavkumar Sawargaonkar <pranavkumar@linaro.org>

commit f6edbbf36da3a27b298b66c7955fc84e1dcca305 upstream.

X-Gene u-boot runs in EL2 mode with MMU enabled hence we might
have stale EL2 tlb enteris when we enable EL2 MMU on each host CPU.

This can happen on any ARM/ARM64 board running bootloader in
Hyp-mode (or EL2-mode) with MMU enabled.

This patch ensures that we flush all Hyp-mode (or EL2-mode) TLBs
on each host CPU before enabling Hyp-mode (or EL2-mode) MMU.

Cc: <stable@vger.kernel.org>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar@linaro.org>
Signed-off-by: Anup Patel <anup.patel@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
---
 arch/arm/kvm/init.S       | 4 ++++
 arch/arm64/kvm/hyp-init.S | 4 ++++
 2 files changed, 8 insertions(+)
diff mbox

Patch

diff --git a/arch/arm/kvm/init.S b/arch/arm/kvm/init.S
index 1b9844d..ee4f744 100644
--- a/arch/arm/kvm/init.S
+++ b/arch/arm/kvm/init.S
@@ -98,6 +98,10 @@  __do_hyp_init:
 	mrc	p15, 0, r0, c10, c2, 1
 	mcr	p15, 4, r0, c10, c2, 1
 
+	@ Invalidate the stale TLBs from Bootloader
+	mcr	p15, 4, r0, c8, c7, 0	@ TLBIALLH
+	dsb	ish
+
 	@ Set the HSCTLR to:
 	@  - ARM/THUMB exceptions: Kernel config (Thumb-2 kernel)
 	@  - Endianness: Kernel config
diff --git a/arch/arm64/kvm/hyp-init.S b/arch/arm64/kvm/hyp-init.S
index ba84e67..e9c87e5 100644
--- a/arch/arm64/kvm/hyp-init.S
+++ b/arch/arm64/kvm/hyp-init.S
@@ -74,6 +74,10 @@  __do_hyp_init:
 	msr	mair_el2, x4
 	isb
 
+	/* Invalidate the stale TLBs from Bootloader */
+	tlbi    alle2
+	dsb     sy
+
 	mov	x4, #SCTLR_EL2_FLAGS
 	msr	sctlr_el2, x4
 	isb