Re: [Xen-ia64-devel] Patch for PV-on-HVM for IPF

[Doi.Tsunehisa@xxxxxxxxxxxxxx]

You (yamahata) said:
> Although I haven't dug into its details, I want to check my suspicion.
> The relinquishing mm code assumes that there's no racy reference.
> So your patch seems too easy and not-SMP-safe to me.
> For example, mm->pgd isn't protected.
> What do you think?

  You are right. Hypervisor may crash in gnttab_copy code during
p2m table destruction in relinquish_mm code.

  At least, mm->pgd should be nullify before destruction of the body
of p2m table.

  I'll investigate it.

> BTW, I suppose that you also have the another SMP issue related
> to PV-on-HVM. What's going on it?

  Sorry, I could not spend to investigate this issue in last few
weeks. Could you help me ?

Thanks,
- Doi Tsunehisa

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