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KVM: Enable snooping control for supported hardware

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Memory aliases with different memory type is a problem for guest. For the guest
without assigned device, the memory type of guest memory would always been the
same as host(WB); but for the assigned device, some part of memory may be used
as DMA and then set to uncacheable memory type(UC/WC), which would be a conflict of
host memory type then be a potential issue.

Snooping control can guarantee the cache correctness of memory go through the
DMA engine of VT-d.

[avi: fix build on ia64]

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Sheng Yang 2009-04-27 20:35:43 +08:00 • committed by Avi Kivity
parent 4b12f0de33
commit 522c68c441
5 changed files with 46 additions and 5 deletions
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3
include/linux/kvm_host.h
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@ -367,6 +367,9 @@ void kvm_unregister_irq_ack_notifier(struct kvm_irq_ack_notifier *kian);
int kvm_request_irq_source_id(struct kvm *kvm);
void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
/* For vcpu->arch.iommu_flags */
#define KVM_IOMMU_CACHE_COHERENCY 0x1
#ifdef CONFIG_IOMMU_API
int kvm_iommu_map_pages(struct kvm *kvm, gfn_t base_gfn,
unsigned long npages);