Re: [PATCH 2/5] efi/x86: Implement support for unaccepted memory
From: Dave Hansen <hidden>
Date: 2021-08-10 18:31:33
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linux-mm, lkml
On 8/9/21 11:26 PM, Kirill A. Shutemov wrote:
+config UNACCEPTED_MEMORY + bool + depends on EFI_STUB + help + Some Virtual Machine platforms, such as Intel TDX, introduce + the concept of memory acceptance, requiring memory to be accepted + before it can be used by the guest. This protects against a class of + attacks by the virtual machine platform. + + This option adds support for unaccepted memory and makes such memory + usable by kernel.
Do we really need a full-blown user-visible option here? If we, for instance, just did: config UNACCEPTED_MEMORY bool depends on EFI_STUB it could be 'select'ed from the TDX Kconfig and no users would ever be bothered with it. Would a user *ever* turn this on if they don't have TDX (or equivalent)?