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BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3275 The upcoming SEV-SNP support will need to make a few additional MSR protocol based VMGEXIT's. Add a macro that wraps the common setup and response validation logic in one place to keep the code readable. While at it, define SEV_STATUS_MSR that will be used to get the SEV STATUS MSR instead of open coding it. Cc: James Bottomley <jejb@linux.ibm.com> Cc: Min Xu <min.m.xu@intel.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Ard Biesheuvel <ardb+tianocore@kernel.org> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Erdem Aktas <erdemaktas@google.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> Acked-by: Ard Biesheuvel <ardb+tianocore@kernel.org> Suggested-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>