[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [RFC v5 0/6] pci_expander_brdige: support separate pci
From: |
Zihan Yang |
Subject: |
Re: [Qemu-devel] [RFC v5 0/6] pci_expander_brdige: support separate pci domain for pxb-pcie |
Date: |
Thu, 20 Sep 2018 10:30:58 +0800 |
Gerd Hoffmann <address@hidden> 于2018年9月19日周三 下午12:26写道:
>
> > > > 2. Only 4x devices is supported, you need to be careful not to overuse
> > >
> > > Could you elaborate on this please? What happens if you are not careful?
> > > How does management know what the limits are?
> >
> > It means the user might use more space than 768MB for mmconfig,
> > which is [0x80000000m 0xb0000000). If such situation happens, seabios
> > will ignore all extra pxb-pcie devices and not adding e820 entry for them,
> > which makes all the devices under them unworkable.
>
> Ypu should clearly note that this is a limitation of the seabios support
> patches then, so not an issue of the qemu patches.
OK, description will be clearer in next version.
> > As for the management, will some checks when adding mcfg be enough for
> > management? Or I can maintain a variable to indicate how many space
> > have been consumed and warn the user if they exceed the threshold?
> > The latter allows us to do the check when the pxb-pcie is initializing.
>
> I think qemu should not apply any restrictions here.
But will that confuse users when their device is not listed in guest os
while qemu does not throw any error/warning?
> cheers,
> Gerd
>
Thanks,
Zihan
- [Qemu-devel] [RFC v5 1/6] pci_expander_bridge: add type TYPE_PXB_PCIE_HOST, (continued)
- [Qemu-devel] [RFC v5 1/6] pci_expander_bridge: add type TYPE_PXB_PCIE_HOST, Zihan Yang, 2018/09/17
- [Qemu-devel] [RFC v5 3/6] acpi-build: allocate mcfg for pxb-pcie host bridges, Zihan Yang, 2018/09/17
- [Qemu-devel] [RFC v5 4/6] i386/acpi-build: describe new pci domain in AML, Zihan Yang, 2018/09/17
- [Qemu-devel] [RFC v5 5/6] pci_expander_bridge: add config_write callback for pxb-pcie, Zihan Yang, 2018/09/17
- [Qemu-devel] [RFC v5 6/6] pci_expander_bridge: inform seabios of desired mcfg size via hidden bar, Zihan Yang, 2018/09/17
- Re: [Qemu-devel] [RFC v5 0/6] pci_expander_brdige: support separate pci domain for pxb-pcie, Michael S. Tsirkin, 2018/09/18
Re: [Qemu-devel] [RFC v5 0/6] pci_expander_brdige: support separate pci domain for pxb-pcie, Marcel Apfelbaum, 2018/09/20