Re: [PATCH v3 15/16] kvm: x86: ioapic: Lazy update IOAPIC EOI

2019-10-09 Thread Roman Kagan
On Wed, Oct 09, 2019 at 11:21:41AM +0200, Paolo Bonzini wrote: > On 13/09/19 21:01, Suthikulpanit, Suravee wrote: > > /* > > +* In case APICv accelerate EOI write and do not trap, > > +* in-kernel IOAPIC will not be able to receive the EOI. > > +* In this case, we do lazy update of

Re: [PATCH v3 15/16] kvm: x86: ioapic: Lazy update IOAPIC EOI

2019-10-09 Thread Paolo Bonzini
On 13/09/19 21:01, Suthikulpanit, Suravee wrote: > /* > + * In case APICv accelerate EOI write and do not trap, > + * in-kernel IOAPIC will not be able to receive the EOI. > + * In this case, we do lazy update of the pending EOI when > + * trying to set IOAPIC irq. > +

[PATCH v3 15/16] kvm: x86: ioapic: Lazy update IOAPIC EOI

2019-09-13 Thread Suthikulpanit, Suravee
In-kernel IOAPIC does not receive EOI with AMD SVM AVIC since the processor accelerate write to APIC EOI register and does not trap if the interrupt is edge-triggered. Workaround this by lazy check for pending APIC EOI at the time when setting new IOPIC irq, and update IOAPIC EOI if no pending API