Re: [Qemu-devel] [PULL for-1.8 1/2] pc: disable pci-info

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Nov 26, 2013 at 12:00:51PM +0100, Gerd Hoffmann wrote:
>   Hi,
> 
> > I think it's down to other qemu bugs (such as _CRS not covering
> > all of PCI memory), we shall just fix them.
> 
> i.e. the attached patch should fixup things.
> 
> cheers,
>   Gerd
> 

Yes, I think it's a start. Q35 is a bit harder because of the MMIO
region.  Do we want to tweak end too? There's all kind of
stuff there so need to be careful ...

> >From a81b8d66e24fd298ce7654d424a378337e6cf132 Mon Sep 17 00:00:00 2001
> From: Gerd Hoffmann <kraxel@redhat.com>
> Date: Tue, 26 Nov 2013 11:46:11 +0100
> Subject: [PATCH] piix: fix 32bit pci hole
> 
> Make the 32bit pci hole start at end of ram, so all possible address
> space is covered.  Of course the firmware can use less than that.
> Leaving space unused is no problem, mapping pci bars outside the
> hole causes problems though.
> 
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>  hw/pci-host/piix.c | 10 +---------
>  1 file changed, 1 insertion(+), 9 deletions(-)
> 
> diff --git a/hw/pci-host/piix.c b/hw/pci-host/piix.c
> index edc974e..1414a2b 100644
> --- a/hw/pci-host/piix.c
> +++ b/hw/pci-host/piix.c
> @@ -345,15 +345,7 @@ PCIBus *i440fx_init(PCII440FXState **pi440fx_state,
>      f->ram_memory = ram_memory;
>  
>      i440fx = I440FX_PCI_HOST_BRIDGE(dev);
> -    /* Set PCI window size the way seabios has always done it. */
> -    /* Power of 2 so bios can cover it with a single MTRR */
> -    if (ram_size <= 0x80000000) {
> -        i440fx->pci_info.w32.begin = 0x80000000;
> -    } else if (ram_size <= 0xc0000000) {
> -        i440fx->pci_info.w32.begin = 0xc0000000;
> -    } else {
> -        i440fx->pci_info.w32.begin = 0xe0000000;
> -    }
> +    i440fx->pci_info.w32.begin = ram_size;
>  
>      memory_region_init_alias(&f->pci_hole, OBJECT(d), "pci-hole", f->pci_address_space,
>                               pci_hole_start, pci_hole_size);
> -- 
> 1.8.3.1
>