Re: [PATCH 4/4] KVM: x86: Disable the TDX module during kexec and kdump

[Edgecombe, Rick P]

On Mon, 2026-03-09 at 16:15 +0800, Chao Gao wrote:
> > -	/*
> > -	 * Some early TDX-capable platforms have an erratum.  A
> > kernel
> > -	 * partial write (a write transaction of less than
> > cacheline
> > -	 * lands at memory controller) to TDX private memory
> > poisons that
> > -	 * memory, and a subsequent read triggers a machine check.
> > -	 *
> > -	 * On those platforms the old kernel must reset TDX
> > private
> > -	 * memory before jumping to the new kernel otherwise the
> > new
> > -	 * kernel may see unexpected machine check.  For
> > simplicity
> > -	 * just fail kexec/kdump on those platforms.
> > -	 */
> > -	if (boot_cpu_has_bug(X86_BUG_TDX_PW_MCE)) {
> > -		pr_info_once("Not allowed on platform with
> > tdx_pw_mce bug\n");
> > -		return -EOPNOTSUPP;
> > -	}
> 
> With this series, we need to update the "Kexec" section in tdx.rst.

Nice catch, and I agree on the others. Will update it. Thanks.