APPLIED: [PATCH 0/2][l linux-azure] Azure: Update TDX with HCL support

[Tim Gardner]

On 10/31/23 7:19 AM, Tim Gardner wrote:
> BugLink: https://bugs.launchpad.net/bugs/2042096
> 
> 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
> 
Applied to lunar/linux-azure:master-next. Thanks.

-rtg
-- 
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Tim Gardner
Canonical, Inc