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[hyperv] Ignore unsolicited VMBus messages 

In some high-end Azure instances (e.g. NC6) we may receive an
unsolicited VMBUS_OFFER_CHANNEL message for a PCIe pass-through device
some time after completing the bus enumeration.  This currently causes
apparently random failures due to unexpected VMBus message types.

Fix by ignoring any unsolicited VMBus messages.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/58/merge
Michael Brown 2017-01-24 15:03:10 +00:00
parent 90fc2f273a
commit 321af68b72
1 changed files with 43 additions and 39 deletions
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82
src/interface/hyperv/vmbus.c
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@ -90,12 +90,12 @@ static int vmbus_post_empty_message ( struct hv_hypervisor *hv,
}
/**
* Wait for received message
* Wait for received message of any type
*
* @v hv Hyper-V hypervisor
* @ret rc Return status code
*/
static int vmbus_wait_for_message ( struct hv_hypervisor *hv ) {
static int vmbus_wait_for_any_message ( struct hv_hypervisor *hv ) {
struct vmbus *vmbus = hv->vmbus;
int rc;
@ -116,6 +116,38 @@ static int vmbus_wait_for_message ( struct hv_hypervisor *hv ) {
return 0;
}
/**
* Wait for received message of a specified type, ignoring any others
*
* @v hv Hyper-V hypervisor
* @v type Message type
* @ret rc Return status code
*/
static int vmbus_wait_for_message ( struct hv_hypervisor *hv,
unsigned int type ) {
struct vmbus *vmbus = hv->vmbus;
const struct vmbus_message_header *header = &vmbus->message->header;
int rc;
/* Loop until specified message arrives, or until an error occurs */
while ( 1 ) {
/* Wait for message */
if ( ( rc = vmbus_wait_for_any_message ( hv ) ) != 0 )
return rc;
/* Check for requested message type */
if ( header->type == cpu_to_le32 ( type ) )
return 0;
/* Ignore any other messages (e.g. due to additional
* channels being offered at runtime).
*/
DBGC ( vmbus, "VMBUS %p ignoring message type %d (expecting "
"%d)\n", vmbus, le32_to_cpu ( header->type ), type );
}
}
/**
* Initiate contact
*
@ -144,15 +176,10 @@ static int vmbus_initiate_contact ( struct hv_hypervisor *hv,
return rc;
/* Wait for response */
if ( ( rc = vmbus_wait_for_message ( hv ) ) != 0 )
if ( ( rc = vmbus_wait_for_message ( hv, VMBUS_VERSION_RESPONSE ) ) !=0)
return rc;
/* Check response */
if ( version->header.type != cpu_to_le32 ( VMBUS_VERSION_RESPONSE ) ) {
DBGC ( vmbus, "VMBUS %p unexpected version response type %d\n",
vmbus, le32_to_cpu ( version->header.type ) );
return -EPROTO;
}
if ( ! version->supported ) {
DBGC ( vmbus, "VMBUS %p requested version not supported\n",
vmbus );
@ -178,8 +205,6 @@ static int vmbus_initiate_contact ( struct hv_hypervisor *hv,
* @ret rc Return status code
*/
static int vmbus_unload ( struct hv_hypervisor *hv ) {
struct vmbus *vmbus = hv->vmbus;
const struct vmbus_message_header *header = &vmbus->message->header;
int rc;
/* Post message */
@ -187,16 +212,9 @@ static int vmbus_unload ( struct hv_hypervisor *hv ) {
return rc;
/* Wait for response */
if ( ( rc = vmbus_wait_for_message ( hv ) ) != 0 )
if ( ( rc = vmbus_wait_for_message ( hv, VMBUS_UNLOAD_RESPONSE ) ) != 0)
return rc;
/* Check response */
if ( header->type != cpu_to_le32 ( VMBUS_UNLOAD_RESPONSE ) ) {
DBGC ( vmbus, "VMBUS %p unexpected unload response type %d\n",
vmbus, le32_to_cpu ( header->type ) );
return -EPROTO;
}
return 0;
}
@ -290,15 +308,10 @@ int vmbus_establish_gpadl ( struct vmbus_device *vmdev, userptr_t data,
return rc;
/* Wait for response */
if ( ( rc = vmbus_wait_for_message ( hv ) ) != 0 )
if ( ( rc = vmbus_wait_for_message ( hv, VMBUS_GPADL_CREATED ) ) != 0 )
return rc;
/* Check response */
if ( created->header.type != cpu_to_le32 ( VMBUS_GPADL_CREATED ) ) {
DBGC ( vmdev, "VMBUS %s unexpected GPADL response type %d\n",
vmdev->dev.name, le32_to_cpu ( created->header.type ) );
return -EPROTO;
}
if ( created->channel != cpu_to_le32 ( vmdev->channel ) ) {
DBGC ( vmdev, "VMBUS %s unexpected GPADL channel %d\n",
vmdev->dev.name, le32_to_cpu ( created->channel ) );
@ -346,15 +359,10 @@ int vmbus_gpadl_teardown ( struct vmbus_device *vmdev, unsigned int gpadl ) {
return rc;
/* Wait for response */
if ( ( rc = vmbus_wait_for_message ( hv ) ) != 0 )
if ( ( rc = vmbus_wait_for_message ( hv, VMBUS_GPADL_TORNDOWN ) ) != 0 )
return rc;
/* Check response */
if ( torndown->header.type != cpu_to_le32 ( VMBUS_GPADL_TORNDOWN ) ) {
DBGC ( vmdev, "VMBUS %s unexpected GPADL response type %d\n",
vmdev->dev.name, le32_to_cpu ( torndown->header.type ) );
return -EPROTO;
}
if ( torndown->gpadl != cpu_to_le32 ( gpadl ) ) {
DBGC ( vmdev, "VMBUS %s unexpected GPADL ID %#08x\n",
vmdev->dev.name, le32_to_cpu ( torndown->gpadl ) );
@ -443,15 +451,11 @@ int vmbus_open ( struct vmbus_device *vmdev,
return rc;
/* Wait for response */
if ( ( rc = vmbus_wait_for_message ( hv ) ) != 0 )
if ( ( rc = vmbus_wait_for_message ( hv,
VMBUS_OPEN_CHANNEL_RESULT ) ) != 0)
return rc;
/* Check response */
if ( opened->header.type != cpu_to_le32 ( VMBUS_OPEN_CHANNEL_RESULT ) ){
DBGC ( vmdev, "VMBUS %s unexpected open response type %d\n",
vmdev->dev.name, le32_to_cpu ( opened->header.type ) );
return -EPROTO;
}
if ( opened->channel != cpu_to_le32 ( vmdev->channel ) ) {
DBGC ( vmdev, "VMBUS %s unexpected opened channel %#08x\n",
vmdev->dev.name, le32_to_cpu ( opened->channel ) );
@ -1136,8 +1140,8 @@ static int vmbus_probe_channels ( struct hv_hypervisor *hv,
while ( 1 ) {
/* Wait for response */
if ( ( rc = vmbus_wait_for_message ( hv ) ) != 0 )
goto err_wait_for_message;
if ( ( rc = vmbus_wait_for_any_message ( hv ) ) != 0 )
goto err_wait_for_any_message;
/* Handle response */
if ( header->type == cpu_to_le32 ( VMBUS_OFFER_CHANNEL ) ) {
@ -1223,7 +1227,7 @@ static int vmbus_probe_channels ( struct hv_hypervisor *hv,
}
err_unexpected_offer:
err_alloc_vmdev:
err_wait_for_message:
err_wait_for_any_message:
/* Free any devices allocated (but potentially not yet probed) */
list_for_each_entry_safe ( vmdev, tmp, &parent->children,
dev.siblings ) {