Laurent Vivier <lvivier@xxxxxxxxxx> writes:
> On 12/12/2017 13:02, Cédric Le Goater wrote:
>> When restoring a pending interrupt, we are setting the Q bit to force
>> a retrigger in xive_finish_unmask(). But we also need to force an EOI
>> in this case to reach the same initial state : P=1, Q=0.
>>
>> This can be done by not setting 'old_p' for pending interrupts which
>> will inform xive_finish_unmask() that an EOI needs to be sent.
>>
>> Suggested-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
>> Signed-off-by: Cédric Le Goater <clg@xxxxxxxx>
>> ---
>>
>> Tested with a guest running iozone.
>>
>> arch/powerpc/kvm/book3s_xive.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> We really need this patch to fix VM migration on POWER9.
> When will it be merged?
Paul is away, so I'll merge it via the powerpc tree.
I'll mark it:
Fixes: 5af50993850a ("KVM: PPC: Book3S HV: Native usage of the XIVE interrupt controller")
Cc: stable@xxxxxxxxxxxxxxx # v4.12+
cheers
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