[linux-6.6.y] iommu/dma: Fix not fully traversing iova reservations issue #280
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审阅意见：合入RMRR提交(编译通过) 之后再合入 |
”RMRR提交“是指 #261 吗？这边注意到该PR261已经合入完成了。还烦请再帮忙review了。谢谢。 |
zhaoxin inclusion category: other CVE: NA ----------------- For multiple devices in the same iommu group, sorted later devices (based on Bus:Dev.Func) have the RMRR. Sorted earlier device (without RMRR) initialized the iova domain causing the sorted later device goto done_unlock. Then, the sorted later device (with RMRR) cannot execute the iova_reserve_iommu_regions to reserve the RMRR in the group's iova domain, and other devices (in the same group) alloc iova in RMRR are permitted. DMA iova addresses conflict with RMRR in this case. There is a need to make sure all devices of the same group execute reserve iova. Substitute iova_reserve_iommu_regions with iova_reserve_pci_regions (reserved PCI window)and iova_reserve_iommu_regions(reserved resv-region, like RMRR and msi range). And then, goto iova_reserve_iommu_regions could avoid the problem when if (iovad->start_pfn) is true. Signed-off-by: leoliu-oc <leoliu-oc@zhaoxin.com>
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zhaoxin inclusion
category: other
CVE: NA
For multiple devices in the same iommu group, sorted later devices (based on Bus:Dev.Func) have the RMRR.
Sorted earlier device (without RMRR) initialized the iova domain causing the sorted later device goto done_unlock.
Then, the sorted later device (with RMRR) cannot execute the iova_reserve_iommu_regions to reserve the RMRR in the group's iova domain, and other devices (in the same group) alloc iova in RMRR are permitted.
DMA iova addresses conflict with RMRR in this case.
There is a need to make sure all devices of the same group execute reserve iova.
Substitute iova_reserve_iommu_regions with iova_reserve_pci_regions (reserved PCI window)and iova_reserve_iommu_regions(reserved resv-region, like RMRR and msi range). And then, goto iova_reserve_iommu_regions could avoid the problem when if (iovad->start_pfn) is true.