Re: [PATCH v5 12/22] x86/virt/tdx: Convert all memory regions in memblock to TDX memory

[Dave Hansen]

On 8/2/22 18:30, Kai Huang wrote:
> On Fri, 2022-07-08 at 11:34 +1200, Kai Huang wrote:
>>> Why not just entirely remove the lower 1MB from the memblock structure
>>> on TDX systems?  Do something equivalent to adding this on the kernel
>>> command line:
>>>
>>>  	memmap=1M$0x0
>> I will explore this option.  Thanks!
> Hi Dave,
> 
> After investigating and testing, we cannot simply remove first 1MB from e820
> table which is similar to what 'memmap=1M$0x0' does, as the kernel needs low
> memory as trampoline to bring up all APs.

OK, so don't remove it, but reserve it so that the trampoline code can
use it.