From fdce11226c6dbb6d5144c71ad9373c5ee3b0ac5c Mon Sep 17 00:00:00 2001
From: Tom Lendacky <thomas.lendacky@amd.com>
Date: Fri, 6 Nov 2020 11:53:11 -0600
Subject: [PATCH] OvmfPkg/QemuFlashFvbServicesRuntimeDxe: Fix erase blocks for
 SEV-ES

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3008

The original SEV-ES support missed updating the QemuFlashEraseBlock()
function to successfully erase blocks. Update QemuFlashEraseBlock() to
call the QemuFlashPtrWrite() to be able to successfully perform the
commands under SEV-ES.

Fixes: 437eb3f7a8db7681afe0e6064d3a8edb12abb766
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Message-Id: <309c5317a3107bd0e650be20731842a2e1d4b59a.1604685192.git.thomas.lendacky@amd.com>
---
 OvmfPkg/QemuFlashFvbServicesRuntimeDxe/QemuFlash.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/QemuFlash.c b/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/QemuFlash.c
index 0d29bf701a..d19997032e 100644
--- a/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/QemuFlash.c
+++ b/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/QemuFlash.c
@@ -232,8 +232,8 @@ QemuFlashEraseBlock (
   }
 
   Ptr = QemuFlashPtr (Lba, 0);
-  *Ptr = BLOCK_ERASE_CMD;
-  *Ptr = BLOCK_ERASE_CONFIRM_CMD;
+  QemuFlashPtrWrite (Ptr, BLOCK_ERASE_CMD);
+  QemuFlashPtrWrite (Ptr, BLOCK_ERASE_CONFIRM_CMD);
   return EFI_SUCCESS;
 }