In case the 64-bit pci mmio window is larger than the default size
of 32G be generous and hand out larger chunks of address space for
prefetchable mmio bridge windows.
Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
---
OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.inf | 1 +
OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.c | 13 +++++++++++++
2 files changed, 14 insertions(+)
diff --git a/OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.inf
b/OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.inf
index 78b95faa7a7a..f56b1de6fd92 100644
--- a/OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.inf
+++ b/OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.inf
@@ -40,6 +40,7 @@ [Protocols]
[Pcd]
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfHostBridgePciDevId ## CONSUMES
+ gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio64Size ## CONSUMES
[Depex]
TRUE
diff --git a/OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.c
b/OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.c
index c122855b735d..08ea5b57bc18 100644
--- a/OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.c
+++ b/OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.c
@@ -744,12 +744,25 @@ GetResourcePadding (
//
// Request defaults.
//
+ UINT64 Pci64Size = PcdGet64 (PcdPciMmio64Size);
+
+ // non-prefetchable
SetMmioPadding (
--FirstResource,
FALSE,
TRUE,
(UINTN)HighBitSetRoundUp32 (SIZE_2MB)
);
+
+ // prefetchable
+ if (Pci64Size > SIZE_32GB) {
+ SetMmioPadding (
+ --FirstResource,
+ TRUE,
+ FALSE,
+ (UINTN)HighBitSetRoundUp64 (RShiftU64 (Pci64Size, 8))
+ );
+ }
}
//
--
2.37.3
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