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From: Alexandru Elisei <alexandru.elisei@arm.com>
To: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu
Cc: maz@kernel.org, andre.przywara@arm.com, pbonzini@redhat.com
Subject: [kvm-unit-tests RFC PATCH 09/16] lib: arm/arm64: Invalidate TLB before enabling MMU
Date: Wed, 28 Aug 2019 14:38:24 +0100
Message-ID: <1566999511-24916-10-git-send-email-alexandru.elisei@arm.com> (raw)
In-Reply-To: <1566999511-24916-1-git-send-email-alexandru.elisei@arm.com>

Let's invalidate the TLB before enabling the MMU, not after, so we don't
accidently use a stale TLB mapping. For arm64, we already do that in
asm_mmu_enable, and we issue an extra invalidation after the function
returns. Invalidate the TLB in asm_mmu_enable for arm also, and remove the
redundant call to tlb_flush_all.

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
---
 lib/arm/mmu.c | 1 -
 arm/cstart.S  | 4 ++++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/arm/mmu.c b/lib/arm/mmu.c
index 161f7a8e607c..66a05d789386 100644
--- a/lib/arm/mmu.c
+++ b/lib/arm/mmu.c
@@ -57,7 +57,6 @@ void mmu_enable(pgd_t *pgtable)
 	struct thread_info *info = current_thread_info();
 
 	asm_mmu_enable(__pa(pgtable));
-	flush_tlb_all();
 
 	info->pgtable = pgtable;
 	mmu_mark_enabled(info->cpu);
diff --git a/arm/cstart.S b/arm/cstart.S
index 5d4fe4b1570b..316672545551 100644
--- a/arm/cstart.S
+++ b/arm/cstart.S
@@ -160,6 +160,10 @@ halt:
 .equ	NMRR,	0xff000004		@ MAIR1 (from Linux kernel)
 .globl asm_mmu_enable
 asm_mmu_enable:
+	/* TLBIALL */
+	mcr	p15, 0, r2, c8, c7, 0
+	dsb	ish
+
 	/* TTBCR */
 	mrc	p15, 0, r2, c2, c0, 2
 	orr	r2, #(1 << 31)		@ TTB_EAE
-- 
2.7.4

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Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-28 13:38 [kvm-unit-tests RFC PATCH 00/16] arm64: Run at EL2 Alexandru Elisei
2019-08-28 13:38 ` [kvm-unit-tests RFC PATCH 01/16] arm: selftest.c: Remove redundant check for Exception Level Alexandru Elisei
2019-08-28 14:32   ` Andrew Jones
2019-08-28 15:39     ` Alexandru Elisei
2019-08-28 13:38 ` [kvm-unit-tests RFC PATCH 02/16] arm/arm64: psci: Don't run C code without stack or vectors Alexandru Elisei
2019-08-28 14:45   ` Andrew Jones
2019-08-28 15:14     ` Alexandru Elisei
2019-09-02 14:55       ` Alexandru Elisei
2019-09-03  6:37         ` Andrew Jones
2019-08-28 13:38 ` [kvm-unit-tests RFC PATCH 03/16] lib: arm/arm64: Add missing include for alloc_page.h in pgtable.h Alexandru Elisei
2019-08-28 14:47   ` Andrew Jones
2019-08-28 13:38 ` [kvm-unit-tests RFC PATCH 04/16] arm/arm64: selftest: Add prefetch abort test Alexandru Elisei
2019-08-28 14:09   ` Mark Rutland
2019-08-29  8:18     ` Alexandru Elisei
2019-08-29 10:19       ` Mark Rutland
2019-08-28 13:38 ` [kvm-unit-tests RFC PATCH 05/16] arm64: timer: Write to ICENABLER to disable timer IRQ Alexandru Elisei
2019-08-28 13:38 ` [kvm-unit-tests RFC PATCH 06/16] arm64: timer: EOIR the interrupt after masking the timer Alexandru Elisei
2019-08-28 13:38 ` [kvm-unit-tests RFC PATCH 07/16] arm64: timer: Test behavior when timer disabled or masked Alexandru Elisei
2019-08-28 13:38 ` [kvm-unit-tests RFC PATCH 08/16] lib: arm/arm64: Refuse to disable the MMU with non-identity stack pointer Alexandru Elisei
2019-08-28 14:55   ` Andrew Jones
2019-08-28 13:38 ` Alexandru Elisei [this message]
2019-08-28 14:59   ` [kvm-unit-tests RFC PATCH 09/16] lib: arm/arm64: Invalidate TLB before enabling MMU Andrew Jones
2019-08-28 13:38 ` [kvm-unit-tests RFC PATCH 10/16] lib: Add UL and ULL definitions to linux/const.h Alexandru Elisei
2019-08-28 15:10   ` Andrew Jones
2019-08-28 15:46     ` Alexandru Elisei
2019-08-28 16:19       ` Andrew Jones
2019-08-28 13:38 ` [kvm-unit-tests RFC PATCH 11/16] lib: arm64: Run existing tests at EL2 Alexandru Elisei
2019-08-28 13:38 ` [kvm-unit-tests RFC PATCH 12/16] arm64: timer: Add test for EL2 timers Alexandru Elisei
2019-08-28 13:38 ` [kvm-unit-tests RFC PATCH 13/16] arm64: selftest: Add basic test for EL2 Alexandru Elisei
2019-08-28 13:38 ` [kvm-unit-tests RFC PATCH 14/16] lib: arm64: Add support for disabling and re-enabling VHE Alexandru Elisei
2019-08-28 14:19   ` Mark Rutland
2019-08-29  8:36     ` Alexandru Elisei
2019-08-28 13:38 ` [kvm-unit-tests RFC PATCH 15/16] arm64: selftest: Expand EL2 test to disable and re-enable VHE Alexandru Elisei
2019-08-28 13:38 ` [kvm-unit-tests RFC PATCH 16/16] arm64: timer: Run tests with VHE disabled Alexandru Elisei

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