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

[Vishal Annapurve]

On Mon, Sep 1, 2025 at 9:11 AM Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote:
>
> From: Kai Huang <kai.huang@xxxxxxxxx>
>
> 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.  Currently the kernel doesn't track which page is a TDX
> private page.  For simplicity just fail kexec/kdump for those platforms.

Google has a usecase that needs host kdump support on SPR/EMR
platforms. Disabling kdump disables the host's ability to dump very
critical information on host crashes altogether. Is Intel working on
enabling kdump support for platforms with the erratum?