Messages in this thread | | | Subject | Re: [PATCH Part1 v5 35/38] x86/sev: Register SNP guest request platform device | From | Brijesh Singh <> | Date | Fri, 3 Sep 2021 07:08:06 -0500 |
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On 9/3/21 3:15 AM, Dov Murik wrote: >> Unfortunately, the secrets page does not contain a magic header or uuid >> which a guest can read to verify that the page is actually populated by >> the PSP. > In the SNP FW ABI document section 8.14.2.5 there's a Table 61 titled > Secrets Page Format, which states that the first field in that page is a > u32 VERSION field which should equal 2h. > > While not as strict as GUID header, this can help detect early that the > content of the SNP secrets page is invalid.
The description indicates that the field is a version number of the secrets page format; it will get bumped every time the spec steals the reserved bytes for something new. IMHO, we should not depend on the version number.
thanks
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