LoongArch: KVM: Add memory barrier before update pmd entry

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When updating pmd entry such as allocating new pmd page or splitting
huge page into normal page, it is necessary to firstly update all pte
entries, and then update pmd entry.

It is weak order with LoongArch system, there will be problem if other
VCPUs see pmd update firstly while ptes are not updated. Here smp_wmb()
is added to assure this.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

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Bibo Mao 2024-07-09 16:25:51 +08:00 • committed by Huacai Chen

parent b072cbf023

commit 32d4b999da

1 changed files with 2 additions and 0 deletions

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arch/loongarch/kvm/mmu.c

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