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| author | Yanan Wang <wangyanan55@huawei.com> | 2020-12-02 04:10:33 +0800 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2020-12-02 09:42:36 +0000 |
| commit | 3a0b870e3448302ca2ba703bea1b79b61c3f33c6 (patch) | |
| tree | 3820f50b0ad6b3d780ac5ea45d6ae09b614f32ef /arch/arm64/kvm | |
| parent | 5c646b7e1d8bcb12317426287c516dfa4c5171c2 (diff) | |
| download | linux-3a0b870e3448302ca2ba703bea1b79b61c3f33c6.tar.gz linux-3a0b870e3448302ca2ba703bea1b79b61c3f33c6.tar.bz2 linux-3a0b870e3448302ca2ba703bea1b79b61c3f33c6.zip | |
KVM: arm64: Fix handling of merging tables into a block entry
When dirty logging is enabled, we collapse block entries into tables
as necessary. If dirty logging gets canceled, we can end-up merging
tables back into block entries.
When this happens, we must not only free the non-huge page-table
pages but also invalidate all the TLB entries that can potentially
cover the block. Otherwise, we end-up with multiple possible translations
for the same physical page, which can legitimately result in a TLB
conflict.
To address this, replease the bogus invalidation by IPA with a full
VM invalidation. Although this is pretty heavy handed, it happens
very infrequently and saves a bunch of invalidations by IPA.
Signed-off-by: Yanan Wang <wangyanan55@huawei.com>
[maz: fixup commit message]
Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20201201201034.116760-3-wangyanan55@huawei.com
Diffstat (limited to 'arch/arm64/kvm')
| -rw-r--r-- | arch/arm64/kvm/hyp/pgtable.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c index 2beba1dc40ec..bdf8e55ed308 100644 --- a/arch/arm64/kvm/hyp/pgtable.c +++ b/arch/arm64/kvm/hyp/pgtable.c @@ -502,7 +502,13 @@ 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; } |