[edk2-devel] [PATCH 1/3] OvmfPkg/PlatformPei: consider AP stacks for pei memory cap

["Gerd Hoffmann" <kraxel@redhat.com>]

Needed to avoid running out of memory when booting
with a large (~2048) number of vcpus.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 OvmfPkg/PlatformPei/MemDetect.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/OvmfPkg/PlatformPei/MemDetect.c b/OvmfPkg/PlatformPei/MemDetect.c
index 493cb1fbeb01..338798b54171 100644
--- a/OvmfPkg/PlatformPei/MemDetect.c
+++ b/OvmfPkg/PlatformPei/MemDetect.c
@@ -187,6 +187,8 @@ GetPeiMemoryCap (
   UINT32   Pml4Entries;
   UINT32   PdpEntries;
   UINTN    TotalPages;
+  UINTN    ApStacks;
+  UINTN    MemoryCap;
 
   //
   // If DXE is 32-bit, then just return the traditional 64 MB cap.
@@ -234,12 +236,18 @@ GetPeiMemoryCap (
                (PdpEntries + 1) * Pml4Entries + 1;
   ASSERT (TotalPages <= 0x40201);
 
+  ApStacks  = PlatformInfoHob->PcdCpuMaxLogicalProcessorNumber * PcdGet32 (PcdCpuApStackSize);
+  MemoryCap = EFI_PAGES_TO_SIZE (TotalPages) + ApStacks + SIZE_64MB;
+  if (MemoryCap > MAX_UINT32) {
+    MemoryCap = MAX_UINT32;
+  }
+
   //
   // Add 64 MB for miscellaneous allocations. Note that for
   // PhysMemAddressWidth values close to 36, the cap will actually be
   // dominated by this increment.
   //
-  return (UINT32)(EFI_PAGES_TO_SIZE (TotalPages) + SIZE_64MB);
+  return (UINT32)(MemoryCap);
 }
 
 /**
-- 
2.43.0



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