Re: [PATCH v3 1/4] KVM: TDX: Track configurable CPUID bits allowed by KVM

[Binbin Wu]

On 9/3/2026 12:22 AM, Edgecombe, Rick P wrote:
> On Thu, 2026-09-03 at 00:19 +0800, Binbin Wu wrote:
>>> I see. You added patch 2 because without it QEMU breaks. While for
>>> EST/TM2/SDBG/XTPR/DCA, QEMU doesn't break after they are turned to
>>> non-configurable. QEMU cannot represent all the userspace VMM. It still has
>>> the potential to breaks other userspace VMMs.
>>
>> I think the risk is pretty low.
>> I am not sure if Sean could provide some insight about this in google's
>> userspace VMM.
> 
> Can't we fix the issue if we are wrong?

I think it could be fixed to add the missing bits (if any) as bug fix.