lkml.org 
[lkml]   [2021]   [Mar]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 5.11 295/306] KVM: arm64: Fix range alignment when walking page tables
Date
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

From: Jia He <justin.he@arm.com>

commit 357ad203d45c0f9d76a8feadbd5a1c5d460c638b upstream.

When walking the page tables at a given level, and if the start
address for the range isn't aligned for that level, we propagate
the misalignment on each iteration at that level.

This results in the walker ignoring a number of entries (depending
on the original misalignment) on each subsequent iteration.

Properly aligning the address before the next iteration addresses
this issue.

Cc: stable@vger.kernel.org
Reported-by: Howard Zhang <Howard.Zhang@arm.com>
Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Jia He <justin.he@arm.com>
Fixes: b1e57de62cfb ("KVM: arm64: Add stand-alone page-table walker infrastructure")
[maz: rewrite commit message]
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210303024225.2591-1-justin.he@arm.com
Message-Id: <20210305185254.3730990-9-maz@kernel.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/arm64/kvm/hyp/pgtable.c | 1 +
1 file changed, 1 insertion(+)

--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -225,6 +225,7 @@ static inline int __kvm_pgtable_visit(st
goto out;

if (!table) {
+ data->addr = ALIGN_DOWN(data->addr, kvm_granule_size(level));
data->addr += kvm_granule_size(level);
goto out;
}

\
 
 \ /
  Last update: 2021-03-15 16:10    [W:0.609 / U:0.560 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site