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charset="utf-8" From: Stewart Hildebrand Enable the use of IOMMU + PCI in dom0 without having to specify "pci-passthrough=3Dyes". We rely on dom0 to initialize the PCI controller and perform a PHYSDEVOP_pci_device_add call to add each device to SMMU. Enable pci_init() for initializing Xen's internal PCI subsystem, and allow PHYSDEVOP_pci_device_add when pci-passthrough is disabled. is_pci_passthrough_enabled() is not an Arm-only construct, so remove the x86 definition of the function. Signed-off-by: Stewart Hildebrand Signed-off-by: Mykyta Poturai --- hmm. Since dec9e02f3190 ("xen: avoid generation of stub header") Should we also move is_pci_passthrough_enabled() back to xen/arch/arm/inclu= de/asm/pci.h ? Not sure if PPC/RISC-V will plan on using this check. v6->v7: * remove x86 definition of is_pci_passthrough_enabled() * update comments * make pci_physdev_op checks stricter v5->v6: * new patch - this effectively replaces ("Revert "xen/arm: Add cmdline boot option "pci-passthrough =3D = """) --- xen/arch/arm/pci/pci.c | 5 +++-- xen/arch/x86/include/asm/pci.h | 6 ------ xen/drivers/pci/physdev.c | 4 ++-- 3 files changed, 5 insertions(+), 10 deletions(-) diff --git a/xen/arch/arm/pci/pci.c b/xen/arch/arm/pci/pci.c index 78b97beaef..f2281e81aa 100644 --- a/xen/arch/arm/pci/pci.c +++ b/xen/arch/arm/pci/pci.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include =20 @@ -83,9 +84,9 @@ static int __init pci_init(void) { /* * Enable PCI passthrough when has been enabled explicitly - * (pci-passthrough=3Don). + * (pci-passthrough=3Don) or IOMMU is present and enabled. */ - if ( !pci_passthrough_enabled ) + if ( !is_pci_passthrough_enabled() && !iommu_enabled ) return 0; =20 pci_segments_init(); diff --git a/xen/arch/x86/include/asm/pci.h b/xen/arch/x86/include/asm/pci.h index fd5480d67d..720fcc7f09 100644 --- a/xen/arch/x86/include/asm/pci.h +++ b/xen/arch/x86/include/asm/pci.h @@ -49,12 +49,6 @@ bool pci_ro_mmcfg_decode(unsigned long mfn, unsigned int= *seg, extern int pci_mmcfg_config_num; extern struct acpi_mcfg_allocation *pci_mmcfg_config; =20 -/* Unlike ARM, PCI passthrough is always enabled for x86. */ -static always_inline bool is_pci_passthrough_enabled(void) -{ - return true; -} - void arch_pci_init_pdev(struct pci_dev *pdev); =20 static inline bool pci_check_bar(const struct pci_dev *pdev, diff --git a/xen/drivers/pci/physdev.c b/xen/drivers/pci/physdev.c index 0161a85e1e..d8a49cadf3 100644 --- a/xen/drivers/pci/physdev.c +++ b/xen/drivers/pci/physdev.c @@ -19,7 +19,7 @@ ret_t pci_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void= ) arg) struct pci_dev_info pdev_info; nodeid_t node =3D NUMA_NO_NODE; =20 - if ( !is_pci_passthrough_enabled() ) + if ( !is_pci_passthrough_enabled() && !iommu_enabled ) return -EOPNOTSUPP; =20 ret =3D -EFAULT; @@ -57,7 +57,7 @@ ret_t pci_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void= ) arg) case PHYSDEVOP_pci_device_remove: { struct physdev_pci_device dev; =20 - if ( !is_pci_passthrough_enabled() ) + if ( !is_pci_passthrough_enabled() && !iommu_enabled ) return -EOPNOTSUPP; =20 ret =3D -EFAULT; --=20 2.34.1