Public bug reported:
SRU Justification
[Impact]
Microsoft has asked for the addition of 2 patches for TDX and SNP-SEV VM
support with HCL.
The refreshed patches will fix 2 bugs for future Hyper-V versions:
1) PCI DDA for Linux TDX VMs with HCL is not working due to a guest bug and a
host bug. The guest bug is fixed in the mainline version of the TDX patches.
2) On a recent Hyper-V dev build that advertises the Hyper-V TLB flushing
hypercalls, the current Ubuntu 6.2 kernel passes a shared input page to the
Hyper-V while it should pass a private input page; as a result, the hypercall
always fails and Linux now falls back to the legacy native method of flusing
TLB. This slows down the flush-TLB operation . The mainline version doesn't
have the bug.
[Test Plan]
Microsoft tested.
[Regression Potential]
Azure instances with TDX on HCL hypervisors may not work correctly.
[Other Info]
SF: #00364214
** Affects: linux-azure (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux-azure (Ubuntu Lunar)
Importance: Medium
Assignee: Tim Gardner (timg-tpi)
Status: In Progress
** Also affects: linux (Ubuntu Lunar)
Importance: Undecided
Status: New
** Package changed: linux (Ubuntu) => linux-azure (Ubuntu)
** Changed in: linux-azure (Ubuntu Lunar)
Importance: Undecided => Medium
** Changed in: linux-azure (Ubuntu Lunar)
Status: New => In Progress
** Changed in: linux-azure (Ubuntu Lunar)
Assignee: (unassigned) => Tim Gardner (timg-tpi)
** Changed in: linux-azure (Ubuntu)
Status: New => Invalid
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-azure in Ubuntu.
https://bugs.launchpad.net/bugs/2042096
Title:
Azure: Update TDX with HCL support
Status in linux-azure package in Ubuntu:
Invalid
Status in linux-azure source package in Lunar:
In Progress
Bug description:
SRU Justification
[Impact]
Microsoft has asked for the addition of 2 patches for TDX and SNP-SEV
VM support with HCL.
The refreshed patches will fix 2 bugs for future Hyper-V versions:
1) PCI DDA for Linux TDX VMs with HCL is not working due to a guest bug and a
host bug. The guest bug is fixed in the mainline version of the TDX patches.
2) On a recent Hyper-V dev build that advertises the Hyper-V TLB flushing
hypercalls, the current Ubuntu 6.2 kernel passes a shared input page to the
Hyper-V while it should pass a private input page; as a result, the hypercall
always fails and Linux now falls back to the legacy native method of flusing
TLB. This slows down the flush-TLB operation . The mainline version doesn't
have the bug.
[Test Plan]
Microsoft tested.
[Regression Potential]
Azure instances with TDX on HCL hypervisors may not work correctly.
[Other Info]
SF: #00364214
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/2042096/+subscriptions
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