linux-kernel - Re: [PATCH AUTOSEL 5.14 38/99] KVM: PPC: Book3S HV: XICS: Fix mapping of passthrough interrupts

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Date:   Sat, 11 Sep 2021 10:35:49 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Cédric Le Goater <clg@...d.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>, kvm-ppc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH AUTOSEL 5.14 38/99] KVM: PPC: Book3S HV: XICS: Fix
 mapping of passthrough interrupts

On Fri, Sep 10, 2021 at 07:48:18AM +0200, Cédric Le Goater wrote:
>On 9/10/21 2:14 AM, Sasha Levin wrote:
>> From: Cédric Le Goater <clg@...d.org>
>>
>> [ Upstream commit 1753081f2d445f9157550692fcc4221cd3ff0958 ]
>>
>> PCI MSIs now live in an MSI domain but the underlying calls, which
>> will EOI the interrupt in real mode, need an HW IRQ number mapped in
>> the XICS IRQ domain. Grab it there.
>>
>> Signed-off-by: Cédric Le Goater <clg@...d.org>
>> Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
>> Link: https://lore.kernel.org/r/20210701132750.1475580-31-clg@kaod.org
>> Signed-off-by: Sasha Levin <sashal@...nel.org>
>
>
>Why are we backporting this patch in stable trees ?
>
>It should be fine but to compile, we need a partial backport of commit
>51be9e51a800 ("KVM: PPC: Book3S HV: XIVE: Fix mapping of passthrough
>interrupts") which exports irq_get_default_host().

Or, I can drop it if it makes no sense?

-- 
Thanks,
Sasha