[PATCH] MdeModulePkg/Bus/Pci/PciBusDxe: Handle BAR sizing fail in high 32bit of MEM64.

["Zhong, Zarcd" <zarcd.zhong@intel.com>]

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>From 7518212a85269e486d06dcea927a3d34e23372c2 Mon Sep 17 00:00:00 2001
From: Zarcd Zhong <zarcd.zhong@intel.com>
Date: Mon, 4 Jan 2021 17:32:54 +0800
Subject: [PATCH] MdeModulePkg/Bus/Pci/PciBusDxe: Handle BAR sizing fail in high 32bit of MEM64.

    REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3149

    Clear length and alignment for low 32bit of MEM64 BAR if sizing fail in high 32bit.

    Cc: Ray Ni <ray.ni@intel.com>
    Cc: Hao A Wu <hao.a.wu@intel.com>

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From 7518212a85269e486d06dcea927a3d34e23372c2 Mon Sep 17 00:00:00 2001
From: Zarcd Zhong <zarcd.zhong@intel.com>
Date: Mon, 4 Jan 2021 17:32:54 +0800
Subject: [PATCH] MdeModulePkg/Bus/Pci/PciBusDxe: Handle BAR sizing fail in
 high 32bit of MEM64.

    REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3149

    Clear length and aligment for low 32bit of MEM64 BAR if sizing fail in high 32bit.

    Cc: Ray Ni <ray.ni@intel.com>
    Cc: Hao A Wu <hao.a.wu@intel.com>
---
 MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c
index 1b64924b7b..8a827be268 100644
--- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c
+++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c
@@ -1686,6 +1686,16 @@ PciIovParseVfBar (
                 );
 
       if (EFI_ERROR (Status)) {
+        //
+        // Reset length/alignment for low 32bit in MEM64 BAR if sizing fail in high 32bit.
+        //
+        PciIoDevice->VfPciBar[BarIndex].BaseAddress = 0;
+        PciIoDevice->VfPciBar[BarIndex].Length      = 0;
+        PciIoDevice->VfPciBar[BarIndex].Alignment   = 0;
+        //
+        // Decrement the offset to lower 32bit of MEM64 BAR.
+        //
+        PciIoDevice->VfPciBar[BarIndex].Offset = (UINT16) (Offset - 4);
         return Offset + 4;
       }
 
-- 
2.16.2.windows.1