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uio_hv_generic: check that host supports monitor page 

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 <sthemmin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
zero-colors
Stephen Hemminger 2018-01-09 12:57:31 -08:00 committed by Greg Kroah-Hartman
parent e7d214642a
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);