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uio_hv_generic: check that host supports monitor page 

[ Upstream commit 06028d1517 ]

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>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Stephen Hemminger 2018-01-09 12:57:31 -08:00 committed by Greg Kroah-Hartman
parent 28b35f9aa0
commit d96a094c98
1 changed files with 7 additions and 0 deletions
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7
drivers/uio/uio_hv_generic.c
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@ -124,6 +124,13 @@ 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_DIRECT);