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OvmfPkg: Add CloudHv support to PlatformScanE820 utility function.

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The PlatformScanE820 utility function is not currently compatible
with CloudHv since it relies on the prescence of the "etc/e820"
QemuFwCfg file. Update the PlatformScanE820 to iterate through the
PVH e820 entries when running on a CloudHv guest.

Signed-off-by: Thomas Barrett <tbarrett@crusoeenergy.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Thomas Barrett 2024-01-12 18:31:42 +00:00 committed by mergify[bot]
parent 195e59bd0c
commit bfad87ceec
1 changed files with 65 additions and 30 deletions
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95
OvmfPkg/Library/PlatformInitLib/MemDetect.c
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@ -248,6 +248,67 @@ PlatformReservationConflictCB (
PlatformInfoHob->PcdPciMmio64Base = NewBase;
}
/**
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
EFI_STATUS
PlatformScanE820Pvh (
IN E820_SCAN_CALLBACK Callback,
IN OUT EFI_HOB_PLATFORM_INFO *PlatformInfoHob
)
{
struct hvm_memmap_table_entry *Memmap;
UINT32 MemmapEntriesCount;
struct hvm_memmap_table_entry *Entry;
EFI_E820_ENTRY64 E820Entry;
EFI_STATUS Status;
UINT32 Loop;
Status = GetPvhMemmapEntries (&Memmap, &MemmapEntriesCount);
if (EFI_ERROR (Status)) {
return Status;
}
for (Loop = 0; Loop < MemmapEntriesCount; Loop++) {
Entry = Memmap + Loop;
if (Entry->type == XEN_HVM_MEMMAP_TYPE_RAM) {
E820Entry.BaseAddr = Entry->addr;
E820Entry.Length = Entry->size;
E820Entry.Type = Entry->type;
Callback (&E820Entry, PlatformInfoHob);
}
}
return EFI_SUCCESS;
}
/**
Iterate over the entries in QEMU's fw_cfg E820 RAM map, call the
passed callback for each entry.
@ -279,6 +340,10 @@ PlatformScanE820 (
EFI_E820_ENTRY64 E820Entry;
UINTN Processed;
if (PlatformInfoHob->HostBridgeDevId == CLOUDHV_DEVICE_ID) {
return PlatformScanE820Pvh (Callback, PlatformInfoHob);
}
Status = QemuFwCfgFindFile ("etc/e820", &FwCfgItem, &FwCfgSize);
if (EFI_ERROR (Status)) {
return Status;
@ -297,36 +362,6 @@ PlatformScanE820 (
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 (