Messages in this thread | | | Date | Mon, 11 Aug 2008 09:07:35 -0700 | From | Jeremy Fitzhardinge <> | Subject | Re: [RFC][PATCH 2/4] checkpoint/restart: x86 support |
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Dave Hansen wrote: > On Sun, 2008-08-10 at 07:55 -0700, Jeremy Fitzhardinge wrote: > >> Struct pt_regs is not ABI, and can (and has) changed on x86. It's not >> suitable for a checkpoint structure because it only contains the >> registers that the kernel trashes, not all usermode registers (on i386, >> it leaves out %gs, for example). asm-x86/ptrace-abi.h does define stuff >> that's fixed in stone; it expresses it in terms of a register array, >> with constants defining what element is which register. >> > > Thanks for the explanation. > > I just want to reduce the coding and maintenance burden here. Xen must > do this for partition mobility, right? Does it define all its own > stuff? >
You mean save/restore/migrate? Yes, it defines all its own stuff. Checkpoint-resume on a whole VM is a rather simpler operation than a subset of processes.
J
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