Mark as MPSAFE.

Added functions to set interrupt handler and index into virtqueue

Set virtqueues in virtio_child_attach_finish

The number of virtqueue maybe change in a part of VirtIO devices
(e.g. vioif(4)). And it is fixed after negotiation of features.
So the configuration is

Set virtqueues in virtio_child_attach_finish

The number of virtqueue maybe change in a part of VirtIO devices
(e.g. vioif(4)). And it is fixed after negotiation of features.
So the configuration is moved into the function.

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Revert "viornd(4): Process host entropy in softint context."

Apparently this has the effect of sometimes making the network hang
on Google Compute Engine as used by syzbot, which has held up all the

Revert "viornd(4): Process host entropy in softint context."

Apparently this has the effect of sometimes making the network hang
on Google Compute Engine as used by syzbot, which has held up all the
syzkaller testing for weeks now. Let's revert this for now, and
separately try to figure out what's wrong with it.

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viornd(4): Process host entropy in softint context.

Samples added to the entropy pool in hard interrupt context are only
buffered, never processed directly, and if they fill the buffer, the
sample i

viornd(4): Process host entropy in softint context.

Samples added to the entropy pool in hard interrupt context are only
buffered, never processed directly, and if they fill the buffer, the
sample is dropped -- this serves to encourage taking timing samples
in hard interrupt context because it's cheap, and we have no idea how
many samples we really need for full entropy so it's safer to err on
the side of `as many as we can get'.

But for viornd(4), we assume the host has full entropy so we only
need a single 32-byte sample, and we want to avoid dropping it so we
get full entropy ASAP. Entering the sample in a soft interrupt
rather than hard interrupt achieves this.

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viornd(4): Revert IPL change for lock.

This lock is taken in hard interrupt context, so it needs to remain
at IPL_VM.

rnd(9): Adjust IPL of locks used by rndsource callbacks.

These no longer ever run from hard interrupt context or with a spin
lock held, so there is no longer any need to have them at IPL_VM to
block

rnd(9): Adjust IPL of locks used by rndsource callbacks.

These no longer ever run from hard interrupt context or with a spin
lock held, so there is no longer any need to have them at IPL_VM to
block hard interrupts. Instead, lower them to IPL_SOFTSERIAL.

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Add VirtIO PCI v1.0 attachments and fix the drivers affected.

The vioif, ld, scsi, viornd and viomb devices were adjusted when needed and
tested both in legacy 0.9 and v1.0 attachments trough PCI on

Add VirtIO PCI v1.0 attachments and fix the drivers affected.

The vioif, ld, scsi, viornd and viomb devices were adjusted when needed and
tested both in legacy 0.9 and v1.0 attachments trough PCI on amd64, sparc64,
aarch64 and aarch64-eb. ACPI/FDT attachments also tested on
aarch64/aarch64-eb.

Known issues

* viomb on aarch64 works only with ACPI/FDT attachment but not with PCI
attachment. PCI and ACPI/FDT attachment works on aarch64-eb.

* virtio on sparc64 attaches but is it not functioning though not a
regression.

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rnd_attach_source calls the callback itself now.

No need for every driver to explicitly call it to prime the pool.

Eliminate now-unused <sys/rndpool.h>.

remove irrelevant pci(9) #includes from virtio child drivers

reorganize the attachment process for virtio child devices, so that
more common code is shared among the drivers, and it's possible for
the drivers to be correctly dynamically loaded; forbid direct a

reorganize the attachment process for virtio child devices, so that
more common code is shared among the drivers, and it's possible for
the drivers to be correctly dynamically loaded; forbid direct access
to struct virtio_softc from the child driver code

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Don't call virtio_enqueue_abort when virtio_enqueue_reserve fails.
Pointed out by uwe@

Print the negotiated feature bits

Use NULL for initialization of sc_config_change

Convert sys/dev to use <sys/rndsource.h>.

Don't forget to bus_dmamap_unload.

put the "asked for" print also behind VIORNG_DEBUG

Abort only actually initialized slots.

disable debug print by default

Print attachment \n's so that we don't get junky lines
(this driver now matches ld)

Add viornd(4), a driver for the VirtIO entropy source available on
QEMU, KVM, and Google Compute Engine. From OpenBSD.