Messages in this thread | | | Date | Tue, 8 Jun 2021 15:25:51 +0200 | From | Joerg Roedel <> | Subject | Re: [PATCH v3 4/7] x86/sev-es: Run #VC handler in plain IRQ state |
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Hi Peter,
On Tue, Jun 08, 2021 at 01:58:47PM +0200, Peter Zijlstra wrote: > So #VC cannot happen with IRQs disabled? > > raw_spin_lock_irq(&my_lock); > <#VC> > raw_spin_lock_irqsave(&my_lock); // whoopsie > > Every exception that can happen with IRQs disabled must be NMI like. > > Again, what you seem to want is to split the handler in a from-user and > from-kernel way, just like we did with #DB and MCE. See how > exc_debug_user() is IRQ-like and can send signals, while > exc_debug_kernel() is NMI like and can not.
You are right, thanks for pointing this out. I replaced that patch by one implementing the split in a from-user and from-kernel part. Initial testing looks good, will send it out later this week.
Thanks,
Joerg
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