Problem statement: insulate a rather legacy 32bit (no PAE) Linux kernel (+blob modules) with realtime requirements from the underlying more modern 64bit CPU/memory map, and allow debugging.
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Are there any good, minimal bare metal x86 hypervisors worth hacking on? I'm thinking pass through all the hardware, but allow basic hooking and especially guest kernel debugging, 32bit guests, and maybe memory remapping.
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I feel like I’ve seen something that qualifies. Check the SysAdvent from years past.
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I will always sing bhyve's praises, but I'm not sure if that's what you're looking for.
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You may want to try BitVisor. It does not intercept any hardware by default. It does not intercept interrupts. Not sure about memory remapping. There is a simple debug shell you can run from the guest. However, the document is pretty limited.
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It allows you to monitor and intercept PCI device accesses. You can get its log from serial port or UDP if you allow it to take control of an Ethernet device.
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Try
@unicorn_engine. Still has bugs to iron out. Windows has surprisingly been more stable. -
Unicorn has absolutely nothing to do with what I described. It is not a hypervisor, nevermind a bare metal one, and does not support anything like hardware passthrough,
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I have used PikeOS in the past, and it covers all your needs and more (like e.g. ARINC653 time partitioning). BUT unfortunately it is not free.
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You need it for the Korg Kronos, isn't that true? I have recently had troubles with mine, did you read my e-mails?
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Yeah, I have an email backlog though. I've been thinking of trying a few things...
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