linux-kernel - Re: [PATCH v2] KVM: s390: pci: Hook to access KVM lowlevel from VFIO

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Message-ID: <6d11d3b5-a313-8e2b-2f38-44c5a4a63a28@linux.ibm.com>
Date:   Tue, 23 Aug 2022 09:25:27 +0200
From:   Janosch Frank <frankja@...ux.ibm.com>
To:     Pierre Morel <pmorel@...ux.ibm.com>, mjrosato@...ux.ibm.com
Cc:     rdunlap@...radead.org, linux-kernel@...r.kernel.org, lkp@...el.com,
        borntraeger@...ux.ibm.com, farman@...ux.ibm.com,
        linux-s390@...r.kernel.org, kvm@...r.kernel.org, gor@...ux.ibm.com,
        hca@...ux.ibm.com, schnelle@...ux.ibm.com,
        alex.williamson@...hat.com, cohuck@...hat.com
Subject: Re: [PATCH v2] KVM: s390: pci: Hook to access KVM lowlevel from VFIO

On 8/19/22 14:29, Pierre Morel wrote:
> We have a cross dependency between KVM and VFIO when using
> s390 vfio_pci_zdev extensions for PCI passthrough
> To be able to keep both subsystem modular we add a registering
> hook inside the S390 core code.
> 
> This fixes a build problem when VFIO is built-in and KVM is built
> as a module.
> 
> Reported-by: Randy Dunlap <rdunlap@...radead.org>
> Reported-by: kernel test robot <lkp@...el.com>
> Reviewed-by: Matthew Rosato <mjrosato@...ux.ibm.com>
> Reviewed-by: Niklas Schnelle <schnelle@...ux.ibm.com>
> Signed-off-by: Pierre Morel <pmorel@...ux.ibm.com>
> Fixes: 09340b2fca007 ("KVM: s390: pci: add routines to start/stop interpretive execution")
> Cc: <stable@...r.kernel.org>

Acked-by: Janosch Frank <frankja@...ux.ibm.com>

@Niklas @Matt: Since the patches that introduced the PCI interpretation 
went via the KVM tree I'll also move this patch via the KVM tree.