Re: [PATCH v5 16/16] x86/tdx: Add cmdline option to force use of ioremap_host_shared

[Michael S. Tsirkin]

On Tue, Oct 12, 2021 at 10:55:20AM -0700, Andi Kleen wrote:
> 
> > I mean ... it's already wide spread.
> 
> 
> I meant wide spread usage with confidential guests.
> 
> > If we support it with TDX
> > it will be used with TDX.
> 
> It has some security trade offs. The main reason to use TDX is security.
> Also when people take the VT-d tradeoffs they might be ok with the BIOS
> trade offs too.
> 
> -Andi

Interesting. VT-d tradeoffs ... what are they?
Allowing hypervisor to write into BIOS looks like it will
trivially lead to code execution, won't it?

-- 
MST