Utils.swift: Add handling for Intel Virtual Machines #622
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Pallas will override the host’s detected Board ID to “VMM-x86_64” on Intel VMs to allow for software updates regardless of the original board ID.
| let hardwareModelID = getIORegInfo(serviceTarget: "target-sub-type") ?? "Unknown" | ||
| let gestaltModelStringID = getKeyResultFromGestalt("HWModelStr") | ||
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| if getVirtualMachineStatus() && getCPUTypeString() == "Intel" { |
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Genuinely curious, but what happens on non intel VMs, like apple silicon? I'd like to be complete here before landing the next change to nudge.
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On Apple Silicon, since Apple controls the whole process they simply use the machine's properties as-is (so VMA2MACOSAP for VirtualMac2,1 systems, and likely VMA3MACOSAP for VirtualMac3,1 if that ever comes out)
The reason they implemented this odd VMM-x86_64 system for Intel VMs is that VMware, Parallels, etc control much more of the environment and as such more difficult to support (ex. does Apple want to add VMware7,1, Parallels19,1, etc to their catalog). Apple's solution was to override the model properties when doing software updates
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To follow up, I reversed the relevant framework responsible for this logic:
/System/Library/PrivateFrameworks/SoftwareUpdateCoreSupport.framework/Versions/A/SoftwareUpdateCoreSupport
TL;DR:
_BIDeviceInfoGetHWTargetForMobileAssetfetches the model information- If the host has the
x86legacyapsecure boot identifier (non-T2), function invokes_BIDeviceInfoGetMacBoardID - If host is virtual machine, return string with format:
@VMM-%s, sysctlbyname("hw.machine")(results inVMM-x86_64) - Otherwise, return Board ID from IODeviceTree
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I'm going to merge this as-is then make some changes. Thanks for the PR and the feedback/discovery you did. We should talk on Slack some more :) |
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Pallas will override the host’s detected Board ID to "VMM-x86_64" on Intel VMs to allow for software updates regardless of the original model.
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