[SeaBIOS] [PATCH] virtio: add struct vp_device
kraxel at redhat.com
Mon Jun 29 13:21:38 CEST 2015
> You could use the config capability if you wanted
> to, though that multiplies the cost of each access
> by a factor of ~4.
We are moving to 32bit drivers _anyway_, some of our drivers run in
32bit mode already, and with SMM mode landing in kvm now we have a
reliable way to transition to 32bit mode and back, even in corner cases
like guest calling bios from vm86 mode.
So, I don't feel like using the config capability. Might be useful for
virtio-net driver in ipxe though, didn't look there yet.
> I noticed that QEMU doesn't support it but it must, I'll fix it up now.
I've also noticed we are back to 8M pci bars for modern/transitional
virtio devices, due to supporting up to 1024 virt queues now I think.
Should we introduce a per-device virt queue limit? Supporting 1024
queues makes sense for virtio-scsi, virtio-net and maybe virtio-serial.
Other devices will never ever come even close to 1024 virt queues ...
More information about the SeaBIOS