Re: [PATCH Part2 v5 00/45] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support

[Borislav Petkov]

On Mon, Nov 22, 2021 at 02:51:35PM -0800, Dave Hansen wrote:
> By "supporting", do you mean doing something functional?  I don't really
> care if ptrace() to guest private memory returns -EINVAL or whatever.
> The most important thing is not crashing the host.
> 
> Also, as Sean mentioned, this isn't really about ptrace() itself.  It's
> really about ensuring that no kernel or devices accesses to guest
> private memory can induce bad behavior.

I keep repeating this suggestion of mine that we should treat
guest-private pages as hw-poisoned pages which have experienced a
uncorrectable error in the past.

mm already knows how to stay away from those.

-- 
Regards/Gruss,
    Boris.

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