From: pranavkumar@linaro.org (Pranavkumar Sawargaonkar)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH V2] ARM/ARM64: KVM: Nuke Hyp-mode tlbs before enabling MMU
Date: Thu, 31 Jul 2014 12:23:23 +0530 [thread overview]
Message-ID: <1406789604-10533-1-git-send-email-pranavkumar@linaro.org> (raw)
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.
Changelog:
V2:
- Flush Hyp-mode TLBs for both KVM ARM32 and KVM ARM64 at boot time
V1:
- Initial patch with only arm64 change
Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar@linaro.org>
Signed-off-by: Anup Patel <anup.patel@linaro.org>
---
arch/arm/kvm/init.S | 4 ++++
arch/arm64/kvm/hyp-init.S | 4 ++++
2 files changed, 8 insertions(+)
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 d968796..c319116 100644
--- 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
--
1.7.9.5
next reply other threads:[~2014-07-31 6:53 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-31 6:53 Pranavkumar Sawargaonkar [this message]
2014-08-04 12:06 ` [PATCH V2] ARM/ARM64: KVM: Nuke Hyp-mode tlbs before enabling MMU Christoffer Dall
2014-08-22 9:03 ` Marc Zyngier
2014-08-04 13:26 ` Marc Zyngier
2014-08-22 10:23 ` Mark Rutland
2014-08-22 10:41 ` Marc Zyngier
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