[PATCH 4/4] OvmfPkg: Don't access A20 gate register on Cloud Hypervisor

["Boeuf, Sebastien" <sebastien.boeuf@intel.com>]

From: Sebastien Boeuf <sebastien.boeuf@intel.com>

Since Cloud Hypervisor doesn't emulate an A20 gate register on I/O port
0x92, it's better to avoid accessing it when the platform is identified
as Cloud Hypervisor.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
---
 OvmfPkg/Library/PlatformInitLib/Platform.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/OvmfPkg/Library/PlatformInitLib/Platform.c b/OvmfPkg/Library/PlatformInitLib/Platform.c
index cb1a893aef..f2b07dc937 100644
--- a/OvmfPkg/Library/PlatformInitLib/Platform.c
+++ b/OvmfPkg/Library/PlatformInitLib/Platform.c
@@ -314,7 +314,9 @@ PlatformMiscInitialization (
   //
   // Disable A20 Mask
   //
-  IoOr8 (0x92, BIT1);
+  if (PlatformInfoHob->HostBridgeDevId != CLOUDHV_DEVICE_ID) {
+    IoOr8 (0x92, BIT1);
+  }
 
   //
   // Build the CPU HOB with guest RAM size dependent address width and 16-bits
-- 
2.32.0

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