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Re: [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host b
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host bridges |
Date: |
Wed, 23 May 2018 00:44:22 +0300 |
On Tue, May 22, 2018 at 03:36:59PM -0600, Alex Williamson wrote:
> On Tue, 22 May 2018 23:58:30 +0300
> "Michael S. Tsirkin" <address@hidden> wrote:
> >
> > It's not hard to think of a use-case where >256 devices
> > are helpful, for example a nested virt scenario where
> > each device is passed on to a different nested guest.
> >
> > But I think the main feature this is needed for is numa modeling.
> > Guests seem to assume a numa node per PCI root, ergo we need more PCI
> > roots.
>
> But even if we have NUMA affinity per PCI host bridge, a PCI host
> bridge does not necessarily imply a new PCIe domain.
What are you calling a PCIe domain?
> Nearly any Intel
> multi-socket system proves this. Don't get me wrong, I'd like to see
> PCIe domain support and I'm surprised edk2 is so far from supporting
> it, but other than >256 hotpluggable slots, I'm having trouble coming
> up with use cases. Maybe hotpluggable PCI root hierarchies are easier
> with separate domains? Thanks,
>
> Alex
- Re: [Qemu-devel] [RFC 2/3] pci: Link pci_host_bridges with QTAILQ, (continued)
- [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host bridges, Zihan Yang, 2018/05/20
- Re: [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host bridges, Marcel Apfelbaum, 2018/05/21
- Re: [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host bridges, Laszlo Ersek, 2018/05/22
- Re: [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host bridges, Marcel Apfelbaum, 2018/05/22
- Re: [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host bridges, Laszlo Ersek, 2018/05/22
- Re: [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host bridges, Michael S. Tsirkin, 2018/05/22
- Re: [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host bridges, Alex Williamson, 2018/05/22
- Re: [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host bridges,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host bridges, Alex Williamson, 2018/05/22
- Re: [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host bridges, Laszlo Ersek, 2018/05/22
- Re: [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host bridges, Michael S. Tsirkin, 2018/05/22
- Re: [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host bridges, Alex Williamson, 2018/05/23
- Re: [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host bridges, Michael S. Tsirkin, 2018/05/23
- Re: [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host bridges, Alex Williamson, 2018/05/23
- Re: [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host bridges, Michael S. Tsirkin, 2018/05/23
- Re: [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host bridges, Marcel Apfelbaum, 2018/05/23
- Re: [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host bridges, Alex Williamson, 2018/05/22
- Re: [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host bridges, Michael S. Tsirkin, 2018/05/22