[edk2-devel] [RFC PATCH 9/9] OvmfPkg/ResetVector: Expose Migration Handler Entry Addresses

[Tobin Feldman-Fitzthum]

Exposes the address of the Migration Handler entry point via a
GUIDed struct. To support migration, the HV should find this
struct and start one vCPU at the entry point address.

Signed-off-by: Tobin Feldman-Fitzthum <tobin at linux.ibm.com>
---
 OvmfPkg/ResetVector/ResetVector.inf          |  1 +
 OvmfPkg/ResetVector/Ia16/ResetVectorVtf0.asm | 13 +++++++++++++
 OvmfPkg/ResetVector/ResetVector.nasmb        |  1 +
 3 files changed, 15 insertions(+)

diff --git a/OvmfPkg/ResetVector/ResetVector.inf b/OvmfPkg/ResetVector/ResetVector.inf
index d028c92d8c..642757796c 100644
--- a/OvmfPkg/ResetVector/ResetVector.inf
+++ b/OvmfPkg/ResetVector/ResetVector.inf
@@ -49,3 +49,4 @@
   gUefiOvmfPkgTokenSpaceGuid.PcdSevLaunchSecretSize
   gUefiOvmfPkgTokenSpaceGuid.PcdQemuHashTableBase
   gUefiOvmfPkgTokenSpaceGuid.PcdQemuHashTableSize
+  gUefiOvmfPkgTokenSpaceGuid.PcdConfidentialMigrationEntryBase
diff --git a/OvmfPkg/ResetVector/Ia16/ResetVectorVtf0.asm b/OvmfPkg/ResetVector/Ia16/ResetVectorVtf0.asm
index 7ec3c6e980..fc38bd927d 100644
--- a/OvmfPkg/ResetVector/Ia16/ResetVectorVtf0.asm
+++ b/OvmfPkg/ResetVector/Ia16/ResetVectorVtf0.asm
@@ -86,6 +86,19 @@ sevSecretBlockStart:
     DB      0x80, 0x81, 0x12, 0x7C, 0x90, 0xD3, 0xD2, 0x94
 sevSecretBlockEnd:
 
+;
+; The IP of the migration handler. The hypervisor should start
+; the mirror with this address.
+;
+; GUID = 5c7db037-ab87-4282-b33c-7894f01471ec
+;
+sevMigrationBlockStart:
+    DD      SEV_MIGRATION_ENTRY_IP
+    DW      sevMigrationBlockStart - sevMigrationBlockEnd
+    DB      0x5C, 0x7D, 0xB0, 0x37, 0x87, 0xAB, 0x82, 0x42
+    DB      0xB3, 0x3C, 0x78, 0x94, 0xF0, 0x14, 0x71, 0xEC
+sevMigrationBlockEnd:
+
 ;
 ; SEV-ES Processor Reset support
 ;
diff --git a/OvmfPkg/ResetVector/ResetVector.nasmb b/OvmfPkg/ResetVector/ResetVector.nasmb
index acec46a324..344713bfbb 100644
--- a/OvmfPkg/ResetVector/ResetVector.nasmb
+++ b/OvmfPkg/ResetVector/ResetVector.nasmb
@@ -91,5 +91,6 @@
   %define SEV_LAUNCH_SECRET_SIZE  FixedPcdGet32 (PcdSevLaunchSecretSize)
   %define SEV_FW_HASH_BLOCK_BASE  FixedPcdGet32 (PcdQemuHashTableBase)
   %define SEV_FW_HASH_BLOCK_SIZE  FixedPcdGet32 (PcdQemuHashTableSize)
+  %define SEV_MIGRATION_ENTRY_IP  FixedPcdGet32 (PcdConfidentialMigrationEntryBase)
 %include "Ia16/ResetVectorVtf0.asm"
 
-- 
2.20.1



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