From 48c963e31bc664afafd31058483ea8390da63980 Mon Sep 17 00:00:00 2001 From: Jiang Yi Date: Wed, 15 Apr 2020 10:42:29 +0200 Subject: KVM: arm/arm64: Release kvm->mmu_lock in loop to prevent starvation Do cond_resched_lock() in stage2_flush_memslot() like what is done in unmap_stage2_range() and other places holding mmu_lock while processing a possibly large range of memory. Signed-off-by: Jiang Yi Signed-off-by: Marc Zyngier Reviewed-by: Suzuki K Poulose Link: https://lore.kernel.org/r/20200415084229.29992-1-giangyi@amazon.com --- arch/arm64/kvm/mmu.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'arch') diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index 29d8f24df944..917363375e8a 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -422,6 +422,9 @@ static void stage2_flush_memslot(struct kvm *kvm, next = stage2_pgd_addr_end(kvm, addr, end); if (!stage2_pgd_none(kvm, *pgd)) stage2_flush_puds(kvm, pgd, addr, next); + + if (next != end) + cond_resched_lock(&kvm->mmu_lock); } while (pgd++, addr = next, addr != end); } -- cgit v1.2.3