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Re: [Xen-devel] Interrupt injection with ISR set on Intel hardware
- To: Jan Beulich <JBeulich@xxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 29 Oct 2018 16:44:34 +0000
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- Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Kevin Tian <kevin.tian@xxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>
- Delivery-date: Mon, 29 Oct 2018 16:44:41 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 29/10/18 16:33, Jan Beulich wrote:
>>>> On 15.10.18 at 12:30, <roger.pau@xxxxxxxxxx> wrote:
>> (XEN) [22641] PUSH {sp 0, irq 30, vec 0x21}
> This is the last push or pop.
>
>> (XEN) [22650] WAKE PPR 0x00000020
>> (XEN) IRR
>> 0000000002000000000000000000000000000000000000000000000000000000
>> (XEN) ISR
>> 0000000002000000000000000000000000000000000000000000000000000000
> For one I'm having trouble understanding why IRR here is different
> from ...
>
>> (XEN) All LAPIC state:
>> (XEN) [vector] ISR TMR IRR
>> (XEN) [1f:00] 00000000 00000000 00000000
>> (XEN) [3f:20] 00000002 00000000 00000000
>> (XEN) [5f:40] 00000000 00000000 00000000
>> (XEN) [7f:60] 00000000 00000000 00000000
>> (XEN) [9f:80] 00000000 00000000 00000000
>> (XEN) [bf:a0] 00000000 00000000 00000000
>> (XEN) [df:c0] 00000000 00000000 00000000
>> (XEN) [ff:e0] 00000000 00000000 04000000
> ... IRR here.
You shouldn't expect them to be the same.
The WAKE line is sampled before we enable interrupts, and the "All LAPIC
state" is after we enable interrupts and (erroneously) accept vector
0x21 a second time.
In the meantime, a TLB flush has become pending, but interrupts are
currently disabled so it has yet to be accepted. Remember that bits
accumulate in IRR entirely asynchronously.
~Andrew
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