Comment 6 for bug 1769053
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| Dr. David Alan Gilbert (dgilbert-h) wrote Re: Cannot start a guest with more than 1TB of RAM | #6 |
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73416ba
(Get the code!)
Interesting; I thought this was supposed to work.
I know we (RH) have some downstream patches for >1TB RAM, but the last I'd heard they weren't supposed to be necessary any more, except for compatibility with old versions.
It's probably worth checking the guest view fo the CPUs physical address bits and making sure it's no bigger than the host (phys-bits=n or host-phys-bits=true on the -cpu)
QEMU often defaults to 40 bits and things get confusing.
Note also you can do some 1TB+ tests on smaller machines as long as they have a large enough address size on the host CPUs. Tricks like adding empty hot-plug DIMM slots leaving a 1TB hole can tickle some bugs. Even adding 1TB of swap to your host and being careful with your guest can work :-)