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Re: [PATCH] hw/ide: Fix crash when plugging a piix3-ide device into the
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [PATCH] hw/ide: Fix crash when plugging a piix3-ide device into the x-remote machine |
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Date: |
Wed, 7 Jul 2021 10:30:30 +0100 |
On Tue, Jul 06, 2021 at 10:37:03AM +0200, Philippe Mathieu-Daudé wrote:
> Stefan, IIRC the multi-process conclusion was we have to reject
> PCI devices briding another (non-PCI) bus, such ISA / I2C / USB
> / SD / ... because QEMU register the bus type globally and the
> command line machinery resolves it to plug user-creatable devices,
> so we can not share such buses. Is that correct?
I'm not sure I understand, but I'll try:
You can implement an out-of-process USB host controller (a PCI device),
but QEMU will not be aware of devices on this out-of-process USB bus.
If you're referring to a PCI IDE controller that is also exposed on the
ISA bus, then that's hard to do. Maybe there would need to be a separate
ISA-to-PCI bridge device so there's a clean separation between the PCI
device and the ISA portion. The current multi-process QEMU protocol (and
the upcoming vfio-user protocol) support PCI devices but not ISA
devices.
Stefan
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