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Commit 0f98829a authored by Dexuan Cui's avatar Dexuan Cui Committed by Greg Kroah-Hartman
Browse files

Drivers: hv: vmbus: suppress some "hv_vmbus: Unknown GUID" warnings 

Some VMBus devices are not needed by Linux guest[1][2], and, VMBus channels
of Hyper-V Sockets don't really mean usual synthetic devices, so let's
suppress the warnings for them.

[1] https://support.microsoft.com/en-us/kb/2925727
[2] https://msdn.microsoft.com/en-us/library/jj980180(v=winembedded.81).aspx



Signed-off-by: default avatarDexuan Cui <decui@microsoft.com>
Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e2e80841

drivers/hv/channel_mgmt.c

+24 −2
Original line number Diff line number Diff line
@@ -139,10 +139,32 @@ static const struct vmbus_device vmbus_devs[] = { 
	},

};



static u16 hv_get_dev_type(const uuid_le *guid)

static const struct {

	uuid_le guid;

} vmbus_unsupported_devs[] = {

	{ HV_AVMA1_GUID },

	{ HV_AVMA2_GUID },

	{ HV_RDV_GUID	},

};



static bool is_unsupported_vmbus_devs(const uuid_le *guid)

{

	int i;



	for (i = 0; i < ARRAY_SIZE(vmbus_unsupported_devs); i++)

		if (!uuid_le_cmp(*guid, vmbus_unsupported_devs[i].guid))

			return true;

	return false;

}



static u16 hv_get_dev_type(const struct vmbus_channel *channel)

{

	const uuid_le *guid = &channel->offermsg.offer.if_type;

	u16 i;



	if (is_hvsock_channel(channel) || is_unsupported_vmbus_devs(guid))

		return HV_UNKOWN;



	for (i = HV_IDE; i < HV_UNKOWN; i++) {

		if (!uuid_le_cmp(*guid, vmbus_devs[i].guid))

			return i;
@@ -426,7 +448,7 @@ static void vmbus_process_offer(struct vmbus_channel *newchannel) 
			goto err_free_chan;

	}



	dev_type = hv_get_dev_type(&newchannel->offermsg.offer.if_type);

	dev_type = hv_get_dev_type(newchannel);

	if (dev_type == HV_NIC)

		set_channel_signal_state(newchannel, HV_SIGNAL_POLICY_EXPLICIT);

include/linux/hyperv.h

+21 −0
Original line number Diff line number Diff line
@@ -1314,6 +1314,27 @@ u64 hv_do_hypercall(u64 control, void *input, void *output); 
	.guid = UUID_LE(0x44c4f61d, 0x4444, 0x4400, 0x9d, 0x52, \

			0x80, 0x2e, 0x27, 0xed, 0xe1, 0x9f)



/*

 * Linux doesn't support the 3 devices: the first two are for

 * Automatic Virtual Machine Activation, and the third is for

 * Remote Desktop Virtualization.

 * {f8e65716-3cb3-4a06-9a60-1889c5cccab5}

 * {3375baf4-9e15-4b30-b765-67acb10d607b}

 * {276aacf4-ac15-426c-98dd-7521ad3f01fe}

 */



#define HV_AVMA1_GUID \

	.guid = UUID_LE(0xf8e65716, 0x3cb3, 0x4a06, 0x9a, 0x60, \

			0x18, 0x89, 0xc5, 0xcc, 0xca, 0xb5)



#define HV_AVMA2_GUID \

	.guid = UUID_LE(0x3375baf4, 0x9e15, 0x4b30, 0xb7, 0x65, \

			0x67, 0xac, 0xb1, 0x0d, 0x60, 0x7b)



#define HV_RDV_GUID \

	.guid = UUID_LE(0x276aacf4, 0xac15, 0x426c, 0x98, 0xdd, \

			0x75, 0x21, 0xad, 0x3f, 0x01, 0xfe)



/*

 * Common header for Hyper-V ICs

 */