Messages in this thread | | | Date | Fri, 17 Dec 2021 15:51:14 +0100 | Subject | Re: Possible nohz-full/RCU issue in arm64 KVM | From | Paolo Bonzini <> |
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On 12/17/21 14:21, Mark Rutland wrote: > I'm not immediately sure what we*should* do here. What does x86 do for an IRQ > taken from a guest mode? I couldn't spot any handling of that case, but I'm not > familiar enough with the x86 exception model to know if I'm looking in the > right place.
ARM is missing something like commit 160457140187 ("KVM: x86: Defer vtime accounting 'til after IRQ handling", 2021-05-05).
With that change, it would be possible to move guest_exit() in the irq-disabled region without breaking time accounting.
RISC-V has the same issue and it would be fixed in the same way, so let's Cc Anup too.
Paolo
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