[Qemu-devel] Re: [PATCH v3] Do not try loading option ROM for hotplug PCI device in pc-0.11 compat mode

[Anthony Liguori <anthony@codemonkey.ws>]

On 08/30/2010 03:16 AM, Jes.Sorensen@redhat.com wrote:
> From: Jes Sorensen<Jes.Sorensen@redhat.com>
>
> pc-0.11 and older uses fw_cfg to provide option ROMs. As fw_cfg is setup
> at init time, it is not possible to load an option ROM for a hotplug
> device when running in compat mode.
>
> v2: Alex Williamson pointed out that one can get to qdev directly from
> pci_dev, so no need to pass it down.
>
> v3: Braces
>    

What's the specific bug?  The devices themselves have a check for 
hotplug which inhibits rom addition during hotplug so either there's a 
device missing this check or if we're going to go this route, we ought 
to remove those checks in the other devices.

Regards,

Anthony Liguori

> Signed-off-by: Jes Sorensen<Jes.Sorensen@redhat.com>
> ---
>   hw/pci.c |    9 +++++++--
>   1 files changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/hw/pci.c b/hw/pci.c
> index a98d6f3..a20f796 100644
> --- a/hw/pci.c
> +++ b/hw/pci.c
> @@ -1810,11 +1810,16 @@ static int pci_add_option_rom(PCIDevice *pdev)
>           return 0;
>
>       if (!pdev->rom_bar) {
> +        int class;
>           /*
>            * Load rom via fw_cfg instead of creating a rom bar,
> -         * for 0.11 compatibility.
> +         * for 0.11 compatibility. fw_cfg is initialized at boot, so
> +         * we cannot do hotplug load of option roms.
>            */
> -        int class = pci_get_word(pdev->config + PCI_CLASS_DEVICE);
> +        if (pdev->qdev.hotplugged) {
> +            return 0;
> +        }
> +        class = pci_get_word(pdev->config + PCI_CLASS_DEVICE);
>           if (class == 0x0300) {
>               rom_add_vga(pdev->romfile);
>           } else {
>