linux-kernel - [PATCH v2 2/3] KVM: arm64: Fix handling of merging tables into a block entry

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Message-ID: <20201201201034.116760-3-wangyanan55@huawei.com>
Date:   Wed, 2 Dec 2020 04:10:33 +0800
From:   Yanan Wang <wangyanan55@...wei.com>
To:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Marc Zyngier <maz@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        James Morse <james.morse@....com>,
        "Julien Thierry" <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Gavin Shan <gshan@...hat.com>,
        Quentin Perret <qperret@...gle.com>
CC:     <wanghaibin.wang@...wei.com>, <yezengruan@...wei.com>,
        <zhukeqian1@...wei.com>, <yuzenghui@...wei.com>,
        <jiangkunkun@...wei.com>, <wangjingyi11@...wei.com>,
        <lushenming@...wei.com>, Yanan Wang <wangyanan55@...wei.com>
Subject: [PATCH v2 2/3] KVM: arm64: Fix handling of merging tables into a block entry

In dirty logging case(logging_active == True), we need to collapse a
block entry into a table if necessary. After dirty logging is canceled,
when merging tables back into a block entry, we should not only free
the non-huge page-table pages but also invalidate all the TLB entries of
non-huge mappings for the block. Without enough TLBI, multiple TLB entries
for the memory in the block will be cached.

Signed-off-by: Will Deacon <will@...nel.org>
Signed-off-by: Yanan Wang <wangyanan55@...wei.com>
---
 arch/arm64/kvm/hyp/pgtable.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
index b232bdd142a6..23a01dfcb27a 100644
--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -496,7 +496,13 @@ static int stage2_map_walk_table_pre(u64 addr, u64 end, u32 level,
 		return 0;
 
 	kvm_set_invalid_pte(ptep);
-	kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, data->mmu, addr, 0);
+
+	/*
+	 * Invalidate the whole stage-2, as we may have numerous leaf
+	 * entries below us which would otherwise need invalidating
+	 * individually.
+	 */
+	kvm_call_hyp(__kvm_tlb_flush_vmid, data->mmu);
 	data->anchor = ptep;
 	return 0;
 }
-- 
2.19.1