From 06028d15177a1b406b7b075ea47c6a352732f23a Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Tue, 9 Jan 2018 12:57:31 -0800 Subject: 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 Signed-off-by: Greg Kroah-Hartman --- drivers/uio/uio_hv_generic.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'drivers/uio') diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c index dcd80aad9636..ee6d862ef4bd 100644 --- a/drivers/uio/uio_hv_generic.c +++ b/drivers/uio/uio_hv_generic.c @@ -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); -- cgit v1.2.3