virtio: event index support

Add support for event_idx feature, and utilize it to
reduce the number of interrupts and exits for the guest.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

vhost: force vhost off for non-MSI guests

When MSI is off, each interrupt needs to be bounced through the io
thread when it's set/cleared, so vhost-net causes more context switches and
higher CPU ut

vhost: force vhost off for non-MSI guests

When MSI is off, each interrupt needs to be bounced through the io
thread when it's set/cleared, so vhost-net causes more context switches and
higher CPU utilization than userspace virtio which handles networking in
the same thread.

We'll need to fix this by adding level irq support in kvm irqfd,
for now disable vhost-net in these configurations.

Added a vhostforce flag to force vhost-net back on.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

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vhost: fix infinite loop on error path

file.index is unsigned, hence 'while (--file.index >= 0)'
will loop > forever. Change to while (file.index-- > 0).

Reported-by: Jes Sorensen <Jes.Sorensen@red

vhost: fix infinite loop on error path

file.index is unsigned, hence 'while (--file.index >= 0)'
will loop > forever. Change to while (file.index-- > 0).

Reported-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

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vhost_net: mergeable buffers support

use the new tap APIs to set header length

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

Remove unused eventfd.h

This header is not present on my system and causes a build
failure, but is also not used in these files, so remove it.

Signed-off-by: Mike McCormack <mikem@ring3k.org>
Signe

Remove unused eventfd.h

This header is not present on my system and causes a build
failure, but is also not used in these files, so remove it.

Signed-off-by: Mike McCormack <mikem@ring3k.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

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vhost_net.c: v2 Fix build failure introduced by 0bfcd599e3f5c5679cc7d0165a0a1822e2f60de2

Fix build failure introduced by 0bfcd599e3f5c5679cc7d0165a0a1822e2f60de2

The format statement expects unsign

vhost_net.c: v2 Fix build failure introduced by 0bfcd599e3f5c5679cc7d0165a0a1822e2f60de2

Fix build failure introduced by 0bfcd599e3f5c5679cc7d0165a0a1822e2f60de2

The format statement expects unsigned long on x86_64, but receives
unsigned long long, so gcc exits with an error.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

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Fix %lld or %llx printf format use

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

vhost-net: disable mergeable buffers

vhost in current kernels doesn't support mergeable buffers.
Disable this feature if vhost is enabled, until such
support is implemented.

Signed-off-by: Michael

vhost-net: disable mergeable buffers

vhost in current kernels doesn't support mergeable buffers.
Disable this feature if vhost is enabled, until such
support is implemented.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

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vhost: vhost net support

This adds vhost net device support in qemu. Will be tied to tap device
and virtio by following patches. Raw backend is currently missing,
will be worked on/submitted separa

vhost: vhost net support

This adds vhost net device support in qemu. Will be tied to tap device
and virtio by following patches. Raw backend is currently missing,
will be worked on/submitted separately.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

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