Re: "pt_iomul_init: Error: pt_iomul_init can't open file /dev/xen/pci_iomul: No such file or directory: 0x1:0x0.0x0". in qemu-dm-example.hvm.log

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Sat, Nov 02, 2013 at 10:57:50PM +0800, 成会明 wrote:
> hi, 
> 
> I want to pass through "01:00.0",declared as pci=['01:00.0'] in cfg file. but found  error log
> "pt_iomul_init: Error: pt_iomul_init can't open file /dev/xen/pci_iomul: No such file or directory: 0x1:0x0.0x0".  in qemu-dm-example.hvm.log
> In fact, /dev/xen/pci_iomul does not exist. 
> 
> So where /dev/xen/pci_iomul implemented ?

Look in XenServer's Linux sources. Google search should help you
find the right mercurial tree.

> I have searched xen and linux code, found nothing. where pci_iomul device's code implemented ?
> 
> I check tools/qemu-xen-traditional/hw/pass-through.c. and found pt_iomul_init is called if CONFIG_STUBDOM not defined.
> so should CONFIG_STUBDOM be defined ?

You can ignore it.
> 
> Below is part of pass-through.c.
> 
> #ifndef CONFIG_STUBDOM
> 
> #define PCI_IOMUL_DEV_PATH      "/dev/xen/pci_iomul"
> static void pt_iomul_init(struct pt_dev *assigned_device,
>                           uint8_t r_bus, uint8_t r_dev, uint8_t r_func)
> {
>     int fd = PCI_IOMUL_INVALID_FD;
>     struct pci_iomul_setup setup = {
>         .segment = 0,
>         .bus = r_bus,
>         .dev = r_dev,
>         .func = r_func,
>     };
> 
>     fd = open(PCI_IOMUL_DEV_PATH, O_RDWR);
>     if ( fd < 0 ) {
>         PT_LOG("Error: %s can't open file %s: %s: 0x%x:0x%x.0x%x\n",
>                __func__, PCI_IOMUL_DEV_PATH, strerror(errno),
>                r_bus, r_dev, r_func);
>         fd = PCI_IOMUL_INVALID_FD;
> 

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