linux-kernel - Re: [PATCH v12 00/22] TDX host kernel support

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Date:   Wed, 28 Jun 2023 08:12:55 +0000
From:   "Huang, Kai" <kai.huang@...el.com>
To:     "yuan.yao@...ux.intel.com" <yuan.yao@...ux.intel.com>
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Subject: Re: [PATCH v12 00/22] TDX host kernel support

> > 
> > 2. CPU hotplug
> > 
> > DX doesn't support physical (ACPI) CPU hotplug.  A non-buggy BIOS should
>   ^^
> 
> Need T here.

Thanks!

> 
[...]

> > 4. Memory Hotplug
> > 
> > After the kernel passes all "TDX-usable" memory regions to the TDX
> > module, the set of "TDX-usable" memory regions are fixed during module's
> > runtime.  No more "TDX-usable" memory can be added to the TDX module
> > after that.
> > 
> > To achieve above "to guarantee all pages in the page allocator are TDX
> > pages", this series simply choose to reject any non-TDX-usable memory in
> > memory hotplug.
> > 
> > 5. Physical Memory Hotplug
> > 
> > Note TDX assumes convertible memory is always physically present during
> > machine's runtime.  A non-buggy BIOS should never support hot-removal of
> > any convertible memory.  This implementation doesn't handle ACPI memory
> > removal but depends on the BIOS to behave correctly.
> > 
> > Also, if something insane really happened, 4) makes sure either TDX
> 
> Please remove "4)" if have no specific meaning here.
> 

It means the mechanism mentioned in "4. Memory hotplug".
>