Messages in this thread |  | | Date | Tue, 14 May 2019 19:05:22 +0200 | From | Peter Zijlstra <> | Subject | Re: [RFC KVM 18/27] kvm/isolation: function to copy page table entries for percpu buffer |
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On Tue, May 14, 2019 at 06:24:48PM +0200, Alexandre Chartre wrote: > On 5/14/19 5:23 PM, Andy Lutomirski wrote:
> > How important is the ability to enable IRQs while running with the KVM > > page tables? > > > > I can't say, I would need to check but we probably need IRQs at least for > some timers. Sounds like you would really prefer IRQs to be disabled. >
I think what amluto is getting at, is:
again: local_irq_disable(); switch_to_kvm_mm(); /* do very little -- (A) */ VMEnter()
/* runs as guest */
/* IRQ happens */ WMExit() /* inspect exit raisin */ if (/* IRQ pending */) { switch_from_kvm_mm(); local_irq_restore(); goto again; }
but I don't know anything about VMX/SVM at all, so the above might not be feasible, specifically I read something about how VMX allows NMIs where SVM did not somewhere around (A) -- or something like that, earlier in this thread.
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