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Mark ECAM/MMCONFIG and ACPI tables reserved #3471

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Merged
andrewsun2898 merged 1 commit into from
Nov 27, 2025
Merged

Mark ECAM/MMCONFIG and ACPI tables reserved #3471

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18 changes: 18 additions & 0 deletions pkg/boot/universalpayload/handoffblock.go
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Original file line number Diff line number Diff line change
Expand Up @@ -178,6 +178,24 @@ func convertResourceType(memType string) EFIResourceType {
if strings.Contains(memType, "HPET") {
return EFIResourceMemoryReserved
}
// MMCONFIG (until kernel 6.7)/ ECAM (6.8+) must be reserved,
// otherwise PCIe functionality won't work in the OS.
if strings.HasPrefix(memType, "PCI MMCONFIG") || strings.HasPrefix(memType, "PCI ECAM") {
return EFIResourceMemoryReserved
}
// ACPI Tables should be reported as reserved.
// They could be reported as RAM with memory allocation of
// EfiACPIReclaimMemory, but that would be much bigger change,
// and Linux does not reuse ACPI tables memory anyway.
if memType == "ACPI Tables" {
return EFIResourceMemoryReserved
}
// ACPI NVS storage should be reported as reserved.
// Like the ACPI tables it could be reported as memory allocation with
// type EfiACPIMemoryNVS instead.
if memType == "ACPI Non-volatile Storage" {
return EFIResourceMemoryReserved
}
// Treat all other types to be mapped device MMIO address
return EFIResourceMemoryMappedIO
}
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