linux-kernel - [PATCH AUTOSEL 5.1 45/51] arm64: tlbflush: Ensure start/end of address range are aligned to stride

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Message-Id: <20190626034117.23247-45-sashal@kernel.org>
Date:   Tue, 25 Jun 2019 23:41:01 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Hanjun Guo <guohanjun@...wei.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 5.1 45/51] arm64: tlbflush: Ensure start/end of address range are aligned to stride

From: Will Deacon <will.deacon@....com>

[ Upstream commit 01d57485fcdb9f9101a10a18e32d5f8b023cab86 ]

Since commit 3d65b6bbc01e ("arm64: tlbi: Set MAX_TLBI_OPS to
PTRS_PER_PTE"), we resort to per-ASID invalidation when attempting to
perform more than PTRS_PER_PTE invalidation instructions in a single
call to __flush_tlb_range(). Whilst this is beneficial, the mmu_gather
code does not ensure that the end address of the range is rounded-up
to the stride when freeing intermediate page tables in pXX_free_tlb(),
which defeats our range checking.

Align the bounds passed into __flush_tlb_range().

Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Peter Zijlstra <peterz@...radead.org>
Reported-by: Hanjun Guo <guohanjun@...wei.com>
Tested-by: Hanjun Guo <guohanjun@...wei.com>
Reviewed-by: Hanjun Guo <guohanjun@...wei.com>
Signed-off-by: Will Deacon <will.deacon@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/arm64/include/asm/tlbflush.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h
index 3a1870228946..dff8f9ea5754 100644
--- a/arch/arm64/include/asm/tlbflush.h
+++ b/arch/arm64/include/asm/tlbflush.h
@@ -195,6 +195,9 @@ static inline void __flush_tlb_range(struct vm_area_struct *vma,
 	unsigned long asid = ASID(vma->vm_mm);
 	unsigned long addr;
 
+	start = round_down(start, stride);
+	end = round_up(end, stride);
+
 	if ((end - start) >= (MAX_TLBI_OPS * stride)) {
 		flush_tlb_mm(vma->vm_mm);
 		return;
-- 
2.20.1