From 01030ea5709050abd7bd54e681b1aff32098c2e1 Mon Sep 17 00:00:00 2001
From: Philipp Schuster <philipp.schuster@cyberus-technology.de>
Date: Mon, 13 Apr 2026 09:17:24 +0200
Subject: [PATCH] OvmfPkg/VirtioScsiDxe: protect against interrupts (e.g.,
 timer)

---
 OvmfPkg/VirtioScsiDxe/VirtioScsi.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/OvmfPkg/VirtioScsiDxe/VirtioScsi.c b/OvmfPkg/VirtioScsiDxe/VirtioScsi.c
index ac8c57660ebb..11371d14422a 100644
--- a/OvmfPkg/VirtioScsiDxe/VirtioScsi.c
+++ b/OvmfPkg/VirtioScsiDxe/VirtioScsi.c
@@ -446,6 +446,7 @@ VirtioScsiPassThru (
   VOID                       *InDataBuffer;
   UINTN                      InDataNumPages;
   BOOLEAN                    OutDataBufferIsMapped;
+  EFI_TPL                    CurrentTpl;
 
   //
   // Set InDataMapping,OutDataMapping,InDataDeviceAddress and OutDataDeviceAddress to
@@ -596,6 +597,8 @@ VirtioScsiPassThru (
     goto FreeResponseBuffer;
   }
 
+  CurrentTpl = gBS->RaiseTPL (TPL_NOTIFY);
+
   VirtioPrepare (&Dev->Ring, &Indices);
 
   //
@@ -664,10 +667,12 @@ VirtioScsiPassThru (
         NULL
         ) != EFI_SUCCESS)
   {
+    gBS->RestoreTPL (CurrentTpl);
     Status = ReportHostAdapterError (Packet);
     goto UnmapResponseBuffer;
   }
 
+  gBS->RestoreTPL (CurrentTpl);
   Status = ParseResponse (Packet, Response);
 
   //