Patch "ARM/ARM64: KVM: Nuke Hyp-mode tlbs before enabling MMU" has been added to the 3.16-stable tree

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This is a note to let you know that I've just added the patch titled

    ARM/ARM64: KVM: Nuke Hyp-mode tlbs before enabling MMU

to the 3.16-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     arm-arm64-kvm-nuke-hyp-mode-tlbs-before-enabling-mmu.patch
and it can be found in the queue-3.16 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From f6edbbf36da3a27b298b66c7955fc84e1dcca305 Mon Sep 17 00:00:00 2001
From: Pranavkumar Sawargaonkar <pranavkumar@xxxxxxxxxx>
Date: Thu, 31 Jul 2014 12:23:23 +0530
Subject: ARM/ARM64: KVM: Nuke Hyp-mode tlbs before enabling MMU

From: Pranavkumar Sawargaonkar <pranavkumar@xxxxxxxxxx>

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.

Tested-by: Mark Rutland <mark.rutland@xxxxxxx>
Reviewed-by: Marc Zyngier <marc.zyngier@xxxxxxx>
Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar@xxxxxxxxxx>
Signed-off-by: Anup Patel <anup.patel@xxxxxxxxxx>
Signed-off-by: Christoffer Dall <christoffer.dall@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/arm/kvm/init.S       |    4 ++++
 arch/arm64/kvm/hyp-init.S |    4 ++++
 2 files changed, 8 insertions(+)

--- 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
--- a/arch/arm64/kvm/hyp-init.S
+++ b/arch/arm64/kvm/hyp-init.S
@@ -80,6 +80,10 @@ __do_hyp_init:
 	msr	mair_el2, x4
 	isb
 
+	/* Invalidate the stale TLBs from Bootloader */
+	tlbi	alle2
+	dsb	sy
+
 	mrs	x4, sctlr_el2
 	and	x4, x4, #SCTLR_EL2_EE	// preserve endianness of EL2
 	ldr	x5, =SCTLR_EL2_FLAGS


Patches currently in stable-queue which might be from pranavkumar@xxxxxxxxxx are

queue-3.16/arm-arm64-kvm-nuke-hyp-mode-tlbs-before-enabling-mmu.patch
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