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uio_hv_generic: check that host supports monitor page

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In order for userspace application to signal host, it needs the
host to support the monitor page property. Check for the flag
and fail if this is not supported.

Signed-off-by: Stephen Hemminger <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Stephen Hemminger 2018-01-09 12:57:31 -08:00 • committed by Greg Kroah-Hartman
commit 06028d1517
1 changed files with 7 additions and 0 deletions
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7
drivers/uio/uio_hv_generic.c
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@ -133,6 +133,13 @@ hv_uio_probe(struct hv_device *dev,
if (ret)
goto fail;
/* Communicating with host has to be via shared memory not hypercall */
if (!dev->channel->offermsg.monitor_allocated) {
dev_err(&dev->device, "vmbus channel requires hypercall\n");
ret = -ENOTSUPP;
goto fail_close;
}
dev->channel->inbound.ring_buffer->interrupt_mask = 1;
set_channel_read_mode(dev->channel, HV_CALL_ISR);