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Re: [Qemu-devel] [PATCH RFC] virtio-pci: add MMIO property
From: |
Avi Kivity |
Subject: |
Re: [Qemu-devel] [PATCH RFC] virtio-pci: add MMIO property |
Date: |
Mon, 19 Mar 2012 19:58:12 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:10.0.1) Gecko/20120216 Thunderbird/10.0.1 |
On 03/19/2012 05:56 PM, Michael S. Tsirkin wrote:
> Currently virtio-pci is specified so that configuration of the device is
> done through a PCI IO space (via BAR 0 of the virtual PCI device).
> However, Linux guests happen to use ioread/iowrite/iomap primitives
> for access, and these work uniformly across memory/io BARs.
>
> While PCI IO accesses are faster than MMIO on x86 kvm,
> MMIO might be helpful on other systems which don't
> implement PIO or where PIO is slower than MMIO.
>
> Add a property to make it possible to tweak the BAR type.
>
> Signed-off-by: Michael S. Tsirkin <address@hidden>
>
> This is harmless by default but causes segfaults in memory.c
> when enabled. Thus an RFC until I figure out what's wrong.
>
Should be done via an extra BAR (with the same layout, perhaps extended)
so compatibility is preserved.
--
error compiling committee.c: too many arguments to function
- [Qemu-devel] [PATCH RFC] virtio-pci: add MMIO property, Michael S. Tsirkin, 2012/03/19
- Re: [Qemu-devel] [PATCH RFC] virtio-pci: add MMIO property,
Avi Kivity <=
- Re: [Qemu-devel] [PATCH RFC] virtio-pci: add MMIO property, Anthony Liguori, 2012/03/19
- Re: [Qemu-devel] [PATCH RFC] virtio-pci: add MMIO property, Michael S. Tsirkin, 2012/03/19
- Re: [Qemu-devel] [PATCH RFC] virtio-pci: add MMIO property, Anthony Liguori, 2012/03/19
- Re: [Qemu-devel] [PATCH RFC] virtio-pci: add MMIO property, Michael S. Tsirkin, 2012/03/19
- Re: [Qemu-devel] [PATCH RFC] virtio-pci: add MMIO property, Michael S. Tsirkin, 2012/03/19
- Re: [Qemu-devel] [PATCH RFC] virtio-pci: add MMIO property, Anthony Liguori, 2012/03/19
- Re: [Qemu-devel] [PATCH RFC] virtio-pci: add MMIO property, Rusty Russell, 2012/03/19
- Re: [Qemu-devel] [PATCH RFC] virtio-pci: add MMIO property, Anthony Liguori, 2012/03/19