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[Qemu-devel] Re: [PATCHv2 7/8] Change pci bus get_dev_path callback to p


From: Michael S. Tsirkin
Subject: [Qemu-devel] Re: [PATCHv2 7/8] Change pci bus get_dev_path callback to print only slot and func
Date: Mon, 8 Nov 2010 19:26:42 +0200
User-agent: Mutt/1.5.21 (2010-09-15)

On Sun, Oct 31, 2010 at 01:40:08PM +0200, Gleb Natapov wrote:
> Domain should be determined form parent bus and bus number is configured
> by guest and should not be used in qemu internally.
> 
> Signed-off-by: Gleb Natapov <address@hidden>
> ---
>  hw/pci.c |   11 ++++++-----
>  1 files changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/hw/pci.c b/hw/pci.c
> index 92aaa85..1c5706f 100644
> --- a/hw/pci.c
> +++ b/hw/pci.c
> @@ -2138,12 +2138,13 @@ static void pcibus_dev_print(Monitor *mon, 
> DeviceState *dev, int indent)
>  static char *pcibus_get_dev_path(DeviceState *dev)
>  {
>      PCIDevice *d = (PCIDevice *)dev;
> -    char path[16];
> -
> -    snprintf(path, sizeof(path), "%04x:%02x:%02x.%x",
> -             pci_find_domain(d->bus), d->config[PCI_SECONDARY_BUS],
> -             PCI_SLOT(d->devfn), PCI_FUNC(d->devfn));
> +    char path[50];
> +    int off;
>  
> +    off = snprintf(path, sizeof(path), "address@hidden", 
> qdev_driver_name(dev),
> +             PCI_SLOT(d->devfn));
> +    if (PCI_FUNC(d->devfn))
> +        snprintf(path + off, sizeof(path) + off, ",%x", PCI_FUNC(d->devfn));
>      return strdup(path);
>  }

If we want to be backwards compatible at least for a single domain,
we need to call PCI root in that case "0000:00". Can this work?
I think that keeping a single way to address devices is good.


-- 
MST



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