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kvm: iommu: Add cond_resched to legacy device assignment code 

When assigning devices to large memory guests (>=128GB guest
memory in the failure case) the functions to create the
IOMMU page-tables for the whole guest might run for a very
long time. On non-preemptible kernels this might cause
Soft-Lockup warnings. Fix these by adding a cond_resched()
to the mapping and unmapping loops.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
hifive-unleashed-5.1
Joerg Roedel 2015-01-27 11:57:19 +01:00 committed by Paolo Bonzini
parent 82268083fa
commit 128ca093cc
1 changed files with 3 additions and 1 deletions
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4
arch/x86/kvm/iommu.c
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@ -138,7 +138,7 @@ int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
gfn += page_size >> PAGE_SHIFT;
cond_resched();
}
return 0;
@ -306,6 +306,8 @@ static void kvm_iommu_put_pages(struct kvm *kvm,
kvm_unpin_pages(kvm, pfn, unmap_pages);
gfn += unmap_pages;
cond_resched();
}
}