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    PCI: acs p2p upsteram forwarding enabling · ae21ee65
    Allen Kay 提交于
    Note: dom0 checking in v4 has been separated out into 2/2.
    
    This patch enables P2P upstream forwarding in ACS capable PCIe switches.
    It solves two potential problems in virtualization environment where a PCIe
    device is assigned to a guest domain using a HW iommu such as VT-d:
    
    1) Unintentional failure caused by guest physical address programmed
       into the device's DMA that happens to match the memory address range
       of other downstream ports in the same PCIe switch.  This causes the PCI
       transaction to go to the matching downstream port instead of go to the
       root complex to get translated by VT-d as it should be.
    
    2) Malicious guest software intentionally attacks another downstream
       PCIe device by programming the DMA address into the assigned device
       that matches memory address range of the downstream PCIe port.
    
    We are in process of implementing device filtering software in KVM/XEN
    management software to allow device assignment of PCIe devices behind a PCIe
    switch only if it has ACS capability and with the P2P upstream forwarding bits
    enabled.  This patch is intended to work for both KVM and Xen environments.
    Signed-off-by: NAllen Kay <allen.m.kay@intel.com>
    Reviewed-by: NMathew Wilcox <willy@linux.intel.com>
    Reviewed-by: NChris Wright <chris@sous-sol.org>
    Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
    ae21ee65
pci_regs.h 33.7 KB