[PATCH v4 4/7] x86/sev: Add a function to contain all SEV-specific setup operations

[Melody Wang <huibo.wang@amd.com>]

To make the code clean in the boot phase, add a sev_prepare() wrapper
which contains early SEV-specific checks in order to have all that code
in a single place.

No functional changes.

Signed-off-by: Melody Wang <huibo.wang@amd.com>
---
 drivers/firmware/efi/libstub/x86-stub.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/firmware/efi/libstub/x86-stub.c b/drivers/firmware/efi/libstub/x86-stub.c
index cef32e2c82d8..2a1fa773d241 100644
--- a/drivers/firmware/efi/libstub/x86-stub.c
+++ b/drivers/firmware/efi/libstub/x86-stub.c
@@ -783,7 +783,7 @@ static efi_status_t exit_boot(struct boot_params *boot_params, void *handle)
 	return EFI_SUCCESS;
 }
 
-static bool have_unsupported_snp_features(void)
+static bool sev_prepare(void)
 {
 	u64 unsupported;
 
@@ -791,9 +791,9 @@ static bool have_unsupported_snp_features(void)
 	if (unsupported) {
 		efi_err("Unsupported SEV-SNP features detected: 0x%llx\n",
 			unsupported);
-		return true;
+		return false;
 	}
-	return false;
+	return true;
 }
 
 static void efi_get_seed(void *seed, int size)
@@ -933,7 +933,7 @@ void __noreturn efi_stub_entry(efi_handle_t handle,
 
 	hdr = &boot_params->hdr;
 
-	if (have_unsupported_snp_features())
+	if (!sev_prepare())
 		efi_exit(handle, EFI_UNSUPPORTED);
 
 	if (IS_ENABLED(CONFIG_EFI_DXE_MEM_ATTRIBUTES)) {
-- 
2.43.0