x86/sev-es: Use GHCB accessor for setting the MMIO scratch buffer
Use ghcb_set_sw_scratch() to set the GHCB scratch field, which will also set the corresponding bit in the GHCB valid_bitmap field to denote that sw_scratch is actually valid. Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Joerg Roedel <jroedel@suse.de> Link: https://lkml.kernel.org/r/ba84deabdf44a7a880454fb351d189c6ad79d4ba.1601041106.git.thomas.lendacky@amd.com
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