virt/coco/sev-guest: Check SEV_SNP attribute at probe time
No need to check it on every ioctl. And yes, this is a common SEV driver but it does only SNP-specific operations currently. This can be revisited later, when more use cases appear. No functional changes. Signed-off-by:Borislav Petkov (AMD) <bp@alien8.de> Reviewed-by:
Tom Lendacky <thomas.lendacky@amd.com> Link: https://lore.kernel.org/r/20230307192449.24732-3-bp@alien8.de
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