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

[Philip Cox]

On Tue, 2023-10-31 at 07:19 -0600, 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
> 
> 

-- 
Acked-by: Philip Cox <philip.cox at canonical.com>

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