Re: [PATCH 4/7] x86/kexec: Disable kexec/kdump on platforms with TDX partial write erratum

[Dave Hansen]

On 10/1/25 10:17, Vishal Annapurve wrote:
> And also mentions:
> "Also note only the normal kexec needs to worry about this problem, but
> not the crash kexec: 1) The kdump kernel only uses the special memory
> reserved by the first kernel, and the reserved memory can never be used
> by TDX in the first kernel; 2) The /proc/vmcore, which reflects the
> first (crashed) kernel's memory, is only for read.  The read will never
> "poison" TDX memory thus cause unexpected machine check (only partial
> write does)."
> 
> What was the scenario that led to disabling kdump support altogether
> given the above description?

I think it was purely out of convenience so that the disabling could be
three lines of code.

I don't know off the top of my head if there's a simple enough way to
disable kexec but not kdump. When I applied the thing, I was probably
just considering kexec/kdump a monolithic thing and not thinking that
folks would want one but not the other.

Kai, did you have any other motivations?