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KVM: Device Assignment with VT-d

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Based on a patch by: Kay, Allen M <allen.m.kay@intel.com>

This patch enables PCI device assignment based on VT-d support.
When a device is assigned to the guest, the guest memory is pinned and
the mapping is updated in the VT-d IOMMU.

[Amit: Expose KVM_CAP_IOMMU so we can check if an IOMMU is present
and also control enable/disable from userspace]

Signed-off-by: Kay, Allen M <allen.m.kay@intel.com>
Signed-off-by: Weidong Han <weidong.han@intel.com>
Signed-off-by: Ben-Ami Yassour <benami@il.ibm.com>
Signed-off-by: Amit Shah <amit.shah@qumranet.com>

Acked-by: Mark Gross <mgross@linux.intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Ben-Ami Yassour
2008-09-14 03:48:28 +03:00
committed by Avi Kivity
parent 3871794642
commit 62c476c7c7
7 changed files with 281 additions and 21 deletions
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3
include/linux/kvm.h
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@ -384,6 +384,7 @@ struct kvm_trace_rec {
#define KVM_CAP_COALESCED_MMIO 15
#define KVM_CAP_SYNC_MMU 16 /* Changes to host mmap are reflected in guest */
#define KVM_CAP_DEVICE_ASSIGNMENT 17
#define KVM_CAP_IOMMU 18
/*
* ioctls for VM fds
@ -495,4 +496,6 @@ struct kvm_assigned_irq {
__u32 flags;
};
#define KVM_DEV_ASSIGN_ENABLE_IOMMU (1 << 0)
#endif