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The behavior and requirement for the SEV-legacy command is altered when the SNP firmware is in the INIT state. See SEV-SNP firmware ABI specification for more details. Allocate the Trusted Memory Region (TMR) as a 2MB-sized/aligned region when SNP is enabled to satisfy new requirements for SNP. Continue allocating a 1MB-sized region for !SNP configuration. [ bp: Carve out TMR allocation into a helper. ] Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> Co-developed-by: Ashish Kalra <ashish.kalra@amd.com> Signed-off-by: Ashish Kalra <ashish.kalra@amd.com> Signed-off-by: Michael Roth <michael.roth@amd.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Link: https://lore.kernel.org/r/20240126041126.1927228-17-michael.roth@amd.com