From: "Boeuf, Sebastien" <sebastien.boeuf@intel.com>
To: devel@edk2.groups.io
Cc: jiewen.yao@intel.com, jordan.l.justen@intel.com,
kraxel@redhat.com, sebastien.boeuf@intel.com
Subject: [PATCH v5 6/7] OvmfPkg: CloudHv: Rely on PVH memmap instead of CMOS
Date: Tue, 1 Mar 2022 14:29:16 +0100 [thread overview]
Message-ID: <c94df74f77be6bec9726c58535e91e86310c7ea9.1646141266.git.sebastien.boeuf@intel.com> (raw)
In-Reply-To: <cover.1646141266.git.sebastien.boeuf@intel.com>
From: Sebastien Boeuf <sebastien.boeuf@intel.com>
Instead of using the CMOS, the CloudHv platform relies on the list of
memmap entries provided through the PVH boot protocol to determine the
last RAM address below 4G.
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
---
OvmfPkg/PlatformPei/MemDetect.c | 73 +++++++++++++++++++++++++++++
OvmfPkg/PlatformPei/PlatformPei.inf | 2 +
2 files changed, 75 insertions(+)
diff --git a/OvmfPkg/PlatformPei/MemDetect.c b/OvmfPkg/PlatformPei/MemDetect.c
index 1bcb5a08bc..8ecc8257f9 100644
--- a/OvmfPkg/PlatformPei/MemDetect.c
+++ b/OvmfPkg/PlatformPei/MemDetect.c
@@ -17,6 +17,7 @@ Module Name:
#include <IndustryStandard/I440FxPiix4.h>
#include <IndustryStandard/Q35MchIch9.h>
#include <IndustryStandard/CloudHv.h>
+#include <IndustryStandard/Xen/arch-x86/hvm/start_info.h>
#include <PiPei.h>
#include <Register/Intel/SmramSaveStateMap.h>
@@ -315,6 +316,73 @@ ScanOrAdd64BitE820Ram (
return EFI_SUCCESS;
}
+/**
+ Returns PVH memmap
+
+ @param Entries Pointer to PVH memmap
+ @param Count Number of entries
+
+ @return EFI_STATUS
+**/
+EFI_STATUS
+GetPvhMemmapEntries (
+ struct hvm_memmap_table_entry **Entries,
+ UINT32 *Count
+ )
+{
+ UINT32 *PVHResetVectorData;
+ struct hvm_start_info *pvh_start_info;
+
+ PVHResetVectorData = (VOID *)(UINTN)PcdGet32 (PcdXenPvhStartOfDayStructPtr);
+ if (PVHResetVectorData == 0) {
+ return EFI_NOT_FOUND;
+ }
+
+ pvh_start_info = (struct hvm_start_info *)(UINTN)PVHResetVectorData[0];
+
+ *Entries = (struct hvm_memmap_table_entry *)(UINTN)pvh_start_info->memmap_paddr;
+ *Count = pvh_start_info->memmap_entries;
+
+ return EFI_SUCCESS;
+}
+
+STATIC
+UINT64
+GetHighestSystemMemoryAddressFromPvhMemmap (
+ BOOLEAN Below4gb
+ )
+{
+ struct hvm_memmap_table_entry *Memmap;
+ UINT32 MemmapEntriesCount;
+ struct hvm_memmap_table_entry *Entry;
+ EFI_STATUS Status;
+ UINT32 Loop;
+ UINT64 HighestAddress;
+ UINT64 EntryEnd;
+
+ HighestAddress = 0;
+
+ Status = GetPvhMemmapEntries (&Memmap, &MemmapEntriesCount);
+ ASSERT_EFI_ERROR (Status);
+
+ for (Loop = 0; Loop < MemmapEntriesCount; Loop++) {
+ Entry = Memmap + Loop;
+ EntryEnd = Entry->addr + Entry->size;
+
+ if ((Entry->type == XEN_HVM_MEMMAP_TYPE_RAM) &&
+ (EntryEnd > HighestAddress))
+ {
+ if (Below4gb && (EntryEnd <= BASE_4GB)) {
+ HighestAddress = EntryEnd;
+ } else if (!Below4gb && (EntryEnd >= BASE_4GB)) {
+ HighestAddress = EntryEnd;
+ }
+ }
+ }
+
+ return HighestAddress;
+}
+
UINT32
GetSystemMemorySizeBelow4gb (
VOID
@@ -325,6 +393,11 @@ GetSystemMemorySizeBelow4gb (
UINT8 Cmos0x34;
UINT8 Cmos0x35;
+ if (mHostBridgeDevId == CLOUDHV_DEVICE_ID) {
+ // Get the information from PVH memmap
+ return (UINT32)GetHighestSystemMemoryAddressFromPvhMemmap (TRUE);
+ }
+
Status = ScanOrAdd64BitE820Ram (FALSE, &LowerMemorySize, NULL);
if ((Status == EFI_SUCCESS) && (LowerMemorySize > 0)) {
return (UINT32)LowerMemorySize;
diff --git a/OvmfPkg/PlatformPei/PlatformPei.inf b/OvmfPkg/PlatformPei/PlatformPei.inf
index 8ef404168c..212aa7b047 100644
--- a/OvmfPkg/PlatformPei/PlatformPei.inf
+++ b/OvmfPkg/PlatformPei/PlatformPei.inf
@@ -91,6 +91,8 @@
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfDecompressionScratchEnd
gUefiOvmfPkgTokenSpaceGuid.PcdQ35TsegMbytes
gUefiOvmfPkgTokenSpaceGuid.PcdQ35SmramAtDefaultSmbase
+ gUefiOvmfPkgTokenSpaceGuid.PcdXenPvhStartOfDayStructPtr
+ gUefiOvmfPkgTokenSpaceGuid.PcdXenPvhStartOfDayStructPtrSize
gEfiMdePkgTokenSpaceGuid.PcdGuidedExtractHandlerTableAddress
gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwSpareSize
gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableSize
--
2.32.0
---------------------------------------------------------------------
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next prev parent reply other threads:[~2022-03-01 13:29 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-01 13:29 [PATCH v5 0/7] CloudHv: Rely on PVH boot specification Boeuf, Sebastien
2022-03-01 13:29 ` [PATCH v5 1/7] OvmfPkg: Make the Xen ELF header generator more flexible Boeuf, Sebastien
2022-03-01 13:29 ` [PATCH v5 2/7] OvmfPkg: Xen: Use a new fdf include for the PVH ELF header Boeuf, Sebastien
2022-03-01 13:29 ` [PATCH v5 3/7] OvmfPkg: Xen: Generate fdf include file from ELF header generator Boeuf, Sebastien
2022-03-01 13:29 ` [PATCH v5 4/7] OvmfPkg: Generate CloudHv as a PVH ELF binary Boeuf, Sebastien
2022-03-02 7:17 ` [edk2-devel] " Gerd Hoffmann
2022-03-02 11:29 ` Boeuf, Sebastien
2022-03-01 13:29 ` [PATCH v5 5/7] OvmfPkg: CloudHv: Retrieve RSDP address from PVH Boeuf, Sebastien
2022-03-01 13:29 ` Boeuf, Sebastien [this message]
2022-03-01 13:29 ` [PATCH v5 7/7] OvmfPkg: CloudHv: Add README Boeuf, Sebastien
2022-03-02 7:17 ` Gerd Hoffmann
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