From a749e1f93be67a799fcfb437253a533e462b90ee Mon Sep 17 00:00:00 2001
From: Anthony PERARD <anthony.perard@citrix.com>
Date: Tue, 13 Aug 2019 12:31:06 +0100
Subject: OvmfPkg/XenPlatformPei: no hvmloader: get the E820 table via
 hypercall

When the Xen PVH entry point has been used, hvmloader hasn't run and
hasn't prepared an E820 table. The only way left to get an E820 table
is to ask Xen via an hypercall.  We keep the result cached to avoid
making a second hypercall which would give the same result.

Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1689
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20190813113119.14804-23-anthony.perard@citrix.com>
---
 OvmfPkg/XenPlatformPei/Xen.c | 46 +++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 45 insertions(+), 1 deletion(-)

(limited to 'OvmfPkg/XenPlatformPei/Xen.c')

diff --git a/OvmfPkg/XenPlatformPei/Xen.c b/OvmfPkg/XenPlatformPei/Xen.c
index f26f0e56dd..72f6f37b46 100644
--- a/OvmfPkg/XenPlatformPei/Xen.c
+++ b/OvmfPkg/XenPlatformPei/Xen.c
@@ -27,6 +27,7 @@
 #include <Library/MtrrLib.h>
 #include <IndustryStandard/Xen/arch-x86/hvm/start_info.h>
 #include <Library/XenHypercallLib.h>
+#include <IndustryStandard/Xen/memory.h>
 
 #include "Platform.h"
 #include "Xen.h"
@@ -40,6 +41,8 @@ EFI_XEN_INFO mXenInfo;
 // Only the E820 table is used by OVMF.
 //
 EFI_XEN_OVMF_INFO *mXenHvmloaderInfo;
+STATIC EFI_E820_ENTRY64 mE820Entries[128];
+STATIC UINT32 mE820EntriesCount;
 
 /**
   Returns E820 map provided by Xen
@@ -55,6 +58,12 @@ XenGetE820Map (
   UINT32 *Count
   )
 {
+  INTN ReturnCode;
+  xen_memory_map_t Parameters;
+  UINTN LoopIndex;
+  UINTN Index;
+  EFI_E820_ENTRY64 TmpEntry;
+
   //
   // Get E820 produced by hvmloader
   //
@@ -66,7 +75,42 @@ XenGetE820Map (
     return EFI_SUCCESS;
   }
 
-  return EFI_NOT_FOUND;
+  //
+  // Otherwise, get the E820 table from the Xen hypervisor
+  //
+
+  if (mE820EntriesCount > 0) {
+    *Entries = mE820Entries;
+    *Count = mE820EntriesCount;
+    return EFI_SUCCESS;
+  }
+
+  Parameters.nr_entries = 128;
+  set_xen_guest_handle (Parameters.buffer, mE820Entries);
+
+  // Returns a errno
+  ReturnCode = XenHypercallMemoryOp (XENMEM_memory_map, &Parameters);
+  ASSERT (ReturnCode == 0);
+
+  mE820EntriesCount = Parameters.nr_entries;
+
+  //
+  // Sort E820 entries
+  //
+  for (LoopIndex = 1; LoopIndex < mE820EntriesCount; LoopIndex++) {
+    for (Index = LoopIndex; Index < mE820EntriesCount; Index++) {
+      if (mE820Entries[Index - 1].BaseAddr > mE820Entries[Index].BaseAddr) {
+        TmpEntry = mE820Entries[Index];
+        mE820Entries[Index] = mE820Entries[Index - 1];
+        mE820Entries[Index - 1] = TmpEntry;
+      }
+    }
+  }
+
+  *Count = mE820EntriesCount;
+  *Entries = mE820Entries;
+
+  return EFI_SUCCESS;
 }
 
 /**
-- 
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