Re: [PATCH] vdpa/mlx5: set_features should allow reset to zero
From: Michael S. Tsirkin
Date: Wed Feb 24 2021 - 03:48:14 EST
On Wed, Feb 24, 2021 at 04:26:43PM +0800, Jason Wang wrote:
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Basically on first guest access QEMU would tell kernel whether
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guest is using the legacy or the modern interface.
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E.g. virtio_pci_config_read/virtio_pci_config_write will call ioctl(ENABLE_LEGACY, 1)
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while virtio_pci_common_read will call ioctl(ENABLE_LEGACY, 0)
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But this trick work only for PCI I think?
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Thanks
ccw has a revision it can check. mmio does not have transitional devices
at all.
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MST