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Re: [Qemu-devel] [PATCH v2] ioapic: allow buggy guests mishandling level


From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH v2] ioapic: allow buggy guests mishandling level-triggered interrupts to make progress
Date: Tue, 2 Apr 2019 12:20:38 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.1

On 02/04/19 11:08, Liran Alon wrote:
>> -
>> -            if (((entry >> IOAPIC_LVT_TRIGGER_MODE_SHIFT) & 1) !=
>> -                IOAPIC_TRIGGER_LEVEL) {
>> +            if (!(entry & IOAPIC_LVT_REMOTE_IRR)) {
>>                 continue;
>>             }
> I think above “if” of checking remote-irr should just be removed.
> But the rest seems good :)
> 

It seems more logical, as the condition is now the opposite of
ioapic_set_irq: ioapic_set_irq services the interrupt if remote-irr = 0,
EOI does it if remote-irr = 1.

Paolo



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