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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
Download Patch File Download Diff File Expand all files Collapse all files

14
arch/x86/kvm/x86.c
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@@ -35,6 +35,7 @@
#include <linux/module.h>
#include <linux/mman.h>
#include <linux/highmem.h>
#include <linux/intel-iommu.h>
#include <asm/uaccess.h>
#include <asm/msr.h>
@@ -277,9 +278,18 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
list_add(&match->list, &kvm->arch.assigned_dev_head);
if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) {
r = kvm_iommu_map_guest(kvm, match);
if (r)
goto out_list_del;
}
out:
mutex_unlock(&kvm->lock);
return r;
out_list_del:
list_del(&match->list);
pci_release_regions(dev);
out_disable:
pci_disable_device(dev);
out_put:
@@ -1147,6 +1157,9 @@ int kvm_dev_ioctl_check_extension(long ext)
case KVM_CAP_PV_MMU:
r = !tdp_enabled;
break;
case KVM_CAP_IOMMU:
r = intel_iommu_found();
break;
default:
r = 0;
break;
@@ -4282,6 +4295,7 @@ static void kvm_free_vcpus(struct kvm *kvm)
void kvm_arch_destroy_vm(struct kvm *kvm)
{
kvm_iommu_unmap_guest(kvm);
kvm_free_assigned_devices(kvm);
kvm_free_pit(kvm);
kfree(kvm->arch.vpic);