This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 2040163
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/2040163
Title:
Azure: Update TDX support
Status in linux package in Ubuntu:
Incomplete
Bug description:
SRU Justification
[Impact]
Refresh the TDX support and support DDA for a TDX VM with paravisor.
Ideally we would revert
commit b8b46adebbd8 ("UBUNTU: SAUCE: Support TDX+HCL (July 9, 2023)"), and
apply "[PATCH v7 0/8] x86/hyperv: Add AMD sev-snp enlightened guest support
on hyperv" [1]
and apply "[PATCH v3 00/10] Support TDX guests on Hyper-V (the Hyper-V
specific part)" [2]
(Note: [2] depends on [1]), but that would introduce too many changes, and
actually "AMD sev-snp enlightened guest support on hyperv" still needs some
extra patches that are not in the upstream yet, e.g. Tianyu Lan's #HV
interrupt injection patch [3] is not in the upstream yet.
So I think a better way to have [2] is to make a patch that adds the missing
part of [2] for the 6.2-based linux-azure kernel, hence I made this patch.
This patch mainly does the below two things:
a) Add commit 23378295042a ("Drivers: hv: vmbus: Bring the post_msg_page back
for TDX VMs with the paravisor") [4]
This fixes a bug in the hv_pci driver for device assignment (DDA) for a TDX
VM with the paravisor: in such a VM, the hyperv_pcpu_input_arg must be
private (i.e. encrypted), otherwise the hypercalls in hv_pci fail since the
hypercalls in such a VM is handled by the paravisor rather than by the
hypervisor.
b) Undo some hack code introduced by
commit b8b46adebbd8 ("UBUNTU: SAUCE: Support TDX+HCL (July 9, 2023)"),
e.g. in hyperv_init(), this patch moves the below code to its original place:
cpuhp_setup_state(CPUHP_AP_HYPERV_ONLINE, "x86/hyperv_init:online",
hv_cpu_init, hv_cpu_die);
With this patch, now hyperv_init() in this 6.2 linux-azure kernel is
exactly the same as the version in the mainline kernel.
References:
[1] https://lwn.net/ml/linux-kernel/ZOQMiLEdPsD+pF8q@liuwe-devbox-debian-v2/
[2] https://lwn.net/ml/linux-kernel/ZOfwSDjW0wlHozYV@liuwe-devbox-debian-v2/
[3]
https://lwn.net/ml/linux-kernel/[email protected]/
[4]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=23378295042a4bcaeec350733a4771678e7a1f3a
[Test Plan]
Microsoft tested.
I tested the patch for a TDX VM without and with paravisor, a VBS VM,
a SNP VM with paravisor, and a regular VM. All the VMs have 128 vCPUs
and 20 GB of memory. All worked as expected.
[Regression potential]
Azure TDX enabled VMs could misbehave.
[Other Info]
SF: #00364214
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2040163/+subscriptions
--
Mailing list: https://launchpad.net/~kernel-packages
Post to : [email protected]
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp
