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Re: [Qemu-devel] [PATCH RFC v2 1/1] s390x/ccw: create s390 phb for compa


From: Christian Borntraeger
Subject: Re: [Qemu-devel] [PATCH RFC v2 1/1] s390x/ccw: create s390 phb for compat reasons as well
Date: Mon, 18 Sep 2017 09:33:23 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.0


On 09/15/2017 06:39 PM, Cornelia Huck wrote:
> d32bd032d8 ("s390x/ccw: create s390 phb conditionally") made
> registering the s390 pci host bridge conditional on presense
> of the zpci facility bit. Sadly, that breaks migration from
> machines that did not use the cpu model (2.7 and previous).
> 
> Create the s390 phb for pre-cpu model machines as well.
> 
> Fixes: d32bd032d8 ("s390x/ccw: create s390 phb conditionally")
> Signed-off-by: Cornelia Huck <address@hidden>
> ---
>  hw/s390x/s390-virtio-ccw.c | 2 ++
>  target/s390x/cpu_models.c  | 3 +++
>  2 files changed, 5 insertions(+)
> 
> diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
> index 0471407187..907abc7a32 100644
> --- a/hw/s390x/s390-virtio-ccw.c
> +++ b/hw/s390x/s390-virtio-ccw.c
> @@ -269,6 +269,8 @@ static void s390_create_virtio_net(BusState *bus, const 
> char *name)
>      }
>  }
> 
> +static S390CcwMachineClass *get_machine_class(void);
> +
>  static void ccw_init(MachineState *machine)
>  {
>      int ret;
> diff --git a/target/s390x/cpu_models.c b/target/s390x/cpu_models.c
> index c295e641e6..5169379db5 100644
> --- a/target/s390x/cpu_models.c
> +++ b/target/s390x/cpu_models.c
> @@ -196,6 +196,9 @@ bool s390_has_feat(S390Feat feat)
>              }
>          }
>  #endif
> +        if (feat == S390_FEAT_ZPCI) {
> +            return true;
> +        }

Shouldnt that be depend on the machine being 2.7? I mean unless I misread 
the context of this patch, you hard enable the PCI facility bit for all 
machines and make all s390_has_feat(S390_FEAT_ZPCI) useless?


>          return 0;
>      }
>      return test_bit(feat, cpu->model->features);
> 




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