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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2036600
Title:
Azure: Fix Azure vendor ID
Status in linux package in Ubuntu:
Incomplete
Bug description:
SRU Justification
[Impact]
The linux-azure 6.2 kernel doesn't report a correct GUEST_ID
There is a mistake in the commit
(https://git.launchpad.net/~canonical-kernel/ubuntu/+source/linux-
azure/+git/jammy/commit/?id=5dd24f2df3280d4354641f4687dbb36e418e7de8)
:
Before the commit, the good guest_id is 0x8180000602100000.
With the commit, the generated guest_id is incorrect:
0x0080000602100000, i.e. the 0x81 from bit 56~63 are dropped.
See "include/asm-generic/hyperv-tlfs.h" for the definition of the bits:
* Bit(s)
* 63 - Indicates if the OS is Open Source or not; 1 is Open Source
* 62:56 - Os Type; Linux is 0x100 !!!!! Dexuan: this should be 0x1.
I'll post a patch to LKML to fix this typo.
* 55:48 - Distro specific identification
* 47:16 - Linux kernel version number
* 15:0 - Distro specific identification
See https://learn.microsoft.com/en-us/virtualization/hyper-v-on-
windows/tlfs/tlfs ("February, 2020: Released Version 6.0b", page 15)
As a result, the host thinks that the VM is not an open-source OS, and
it's not Linux. Consequently, the "VM Availability" fron Azure portal
is 0 (unhealthy): some users rely on the info to manage their VMs,
e.g. if the VM is erroneously reported "unhealthy", the VM may be
killed and re-created, and the new VM is still "unhealthy", and the VM
may be killed and re-created again...
Please consider integrating the below fix ASAP. This affects regular
VMs, and I think this affects CVMs as well.
The fix should be:
diff --git a/include/asm-generic/hyperv-tlfs.h
b/include/asm-generic/hyperv-tlfs.h
@@ -135,7 +135,7 @@ union hv_reference_tsc_msr {
*
*/
-#define HV_LINUX_VENDOR_ID 0x80 /* Canonical */
+#define HV_LINUX_VENDOR_ID 0x8180 /* Canonical */
[Test Plan]
Microsoft tested
[Regression Potential]
This (incorrect) patch has been in place for 10 years. Its possible
that some consumers have come to rely on this VM identifier.
[Other Info]
SF: #00368936
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