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KVM: Device Assignment with VT-d

Browse source 
Based on a patch by: Kay, Allen M <[email protected]>

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 <[email protected]>
Signed-off-by: Weidong Han <[email protected]>
Signed-off-by: Ben-Ami Yassour <[email protected]>
Signed-off-by: Amit Shah <[email protected]>

Acked-by: Mark Gross <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
This commit is contained in:
Ben-Ami Yassour 2008-09-14 03:48:28 +03:00 • committed by Avi Kivity
commit 62c476c7c7
7 changed files with 281 additions and 21 deletions
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9
virt/kvm/kvm_main.c
View file

@ -41,6 +41,7 @@
#include <linux/pagemap.h>
#include <linux/mman.h>
#include <linux/swap.h>
#include <linux/intel-iommu.h>
#include <asm/processor.h>
#include <asm/io.h>
@ -76,7 +77,7 @@ static inline int valid_vcpu(int n)
return likely(n >= 0 && n < KVM_MAX_VCPUS);
}
static inline int is_mmio_pfn(pfn_t pfn)
inline int is_mmio_pfn(pfn_t pfn)
{
if (pfn_valid(pfn))
return PageReserved(pfn_to_page(pfn));
@ -578,6 +579,12 @@ int __kvm_set_memory_region(struct kvm *kvm,
}
kvm_free_physmem_slot(&old, &new);
/* map the pages in iommu page table */
r = kvm_iommu_map_pages(kvm, base_gfn, npages);
if (r)
goto out;
return 0;
out_free: