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| author |   Weidong Han <weidong.han@intel.com> | 2008-12-08 16:35:39 +0800 |
|---|---|---|
| committer |   Joerg Roedel <joerg.roedel@amd.com> | 2009-01-03 14:02:18 +0100 |
| commit | 1ce28feb22833645a0f3843cd873a0b56ed19ef0 (patch) | |
| tree | d5196526bdcff639a40262b29f45f06019f02b45 /drivers | |
| parent | iommu coherency (diff) | |
| download | linux-dev-1ce28feb22833645a0f3843cd873a0b56ed19ef0.tar.xz linux-dev-1ce28feb22833645a0f3843cd873a0b56ed19ef0.zip | |
Add domain flag DOMAIN_FLAG_VIRTUAL_MACHINE
Add this flag for VT-d used in virtual machine, like KVM.
Signed-off-by: Weidong Han <weidong.han@intel.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pci/intel-iommu.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c index 104e99df2ade..ffbe4c573729 100644 --- a/drivers/pci/intel-iommu.c +++ b/drivers/pci/intel-iommu.c @@ -206,6 +206,11 @@ static inline bool dma_pte_present(struct dma_pte *pte) /* devices under the same p2p bridge are owned in one domain */ #define DOMAIN_FLAG_P2P_MULTIPLE_DEVICES (1 < 0) +/* domain represents a virtual machine, more than one devices + * across iommus may be owned in one domain, e.g. kvm guest. + */ +#define DOMAIN_FLAG_VIRTUAL_MACHINE (1 << 1) + struct dmar_domain { int id; /* domain id */ unsigned long iommu_bmp; /* bitmap of iommus this domain uses*/ @@ -391,6 +396,8 @@ static struct intel_iommu *domain_get_iommu(struct dmar_domain *domain) { int iommu_id; + BUG_ON(domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE); + iommu_id = find_first_bit(&domain->iommu_bmp, g_num_of_iommus); if (iommu_id < 0 || iommu_id >= g_num_of_iommus) return NULL; |