[RFC][PATCH 2/4] checkpoint/restart: x86 support
jeremy at goop.org
Mon Aug 11 09:07:35 PDT 2008
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
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.
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