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authorMichael Kelley <mikelley@microsoft.com>2022-04-13 05:49:00 +0300
committerWei Liu <wei.liu@kernel.org>2022-04-25 18:31:44 +0300
commit66200bbcde697dea7f48071d325ea4dec6f66b11 (patch)
treeaf4475e131349685c5a41431812a1bec70b2642a /include/linux/hyperv.h
parentaf2d861d4cd2a4da5137f795ee3509e6f944a25b (diff)
downloadlinux-66200bbcde697dea7f48071d325ea4dec6f66b11.tar.xz
Drivers: hv: vmbus: Add VMbus IMC device to unsupported list
Hyper-V may offer an Initial Machine Configuration (IMC) synthetic device to guest VMs. The device may be used by Windows guests to get specialization information, such as the hostname. But the device is not used in Linux and there is no Linux driver, so it is unsupported. Currently, the IMC device GUID is not recognized by the VMbus driver, which results in an "Unknown GUID" error message during boot. Add the GUID to the list of known but unsupported devices so that the error message is not generated. Other than avoiding the error message, there is no change in guest behavior. Signed-off-by: Michael Kelley <mikelley@microsoft.com> Link: https://lore.kernel.org/r/1649818140-100953-1-git-send-email-mikelley@microsoft.com Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'include/linux/hyperv.h')
-rw-r--r--include/linux/hyperv.h12
1 files changed, 9 insertions, 3 deletions
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index fe2e0179ed51..2d085d951ee4 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -1451,12 +1451,14 @@ void vmbus_free_mmio(resource_size_t start, resource_size_t size);
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.
+ * Linux doesn't support these 4 devices: the first two are for
+ * Automatic Virtual Machine Activation, the third is for
+ * Remote Desktop Virtualization, and the fourth is Initial
+ * Machine Configuration (IMC) used only by Windows guests.
* {f8e65716-3cb3-4a06-9a60-1889c5cccab5}
* {3375baf4-9e15-4b30-b765-67acb10d607b}
* {276aacf4-ac15-426c-98dd-7521ad3f01fe}
+ * {c376c1c3-d276-48d2-90a9-c04748072c60}
*/
#define HV_AVMA1_GUID \
@@ -1471,6 +1473,10 @@ void vmbus_free_mmio(resource_size_t start, resource_size_t size);
.guid = GUID_INIT(0x276aacf4, 0xac15, 0x426c, 0x98, 0xdd, \
0x75, 0x21, 0xad, 0x3f, 0x01, 0xfe)
+#define HV_IMC_GUID \
+ .guid = GUID_INIT(0xc376c1c3, 0xd276, 0x48d2, 0x90, 0xa9, \
+ 0xc0, 0x47, 0x48, 0x07, 0x2c, 0x60)
+
/*
* Common header for Hyper-V ICs
*/