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pcie: Add a simple PCIe ACS (Access Control Services) helper function

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Implementing an ACS capability on downstream ports and multifunction
endpoints indicates isolation and IOMMU visibility to a finer
granularity. This creates smaller IOMMU groups in the guest and thus
more flexibility in assigning endpoints to guest userspace or an L2
guest.

Signed-off-by: Knut Omang <knut.omang@oracle.com>
Message-Id: <07489975121696f5573b0a92baaf3486ef51e35d.1550768238.git-series.knut.omang@oracle.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Knut Omang 2019-02-21 19:13:22 +01:00 • committed by Michael S. Tsirkin
parent a1fe0b8f27
commit db891a9ba3
3 changed files with 48 additions and 0 deletions
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4
include/hw/pci/pcie_regs.h
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@ -175,4 +175,8 @@ typedef enum PCIExpLinkWidth {
PCI_ERR_COR_INTERNAL | \
PCI_ERR_COR_HL_OVERFLOW)
/* ACS */
#define PCI_ACS_VER 0x1
#define PCI_ACS_SIZEOF 8
#endif /* QEMU_PCIE_REGS_H */