linux-kernel - Re: [Qemu-devel] [RFC PATCH v2 09/15] cpu-model/s390: Add KVM VM attribute interface routines

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Message-ID: <20150220161805.3d04097a@bee>
Date:	Fri, 20 Feb 2015 16:18:05 +0100
From:	Michael Mueller <mimu@...ux.vnet.ibm.com>
To:	Alexander Graf <agraf@...e.de>
Cc:	qemu-devel@...gnu.org, kvm@...r.kernel.org,
	linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
	Gleb Natapov <gleb@...nel.org>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	"Jason J. Herne" <jjherne@...ux.vnet.ibm.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Andreas Faerber <afaerber@...e.de>,
	Richard Henderson <rth@...ddle.net>
Subject: Re: [Qemu-devel] [RFC PATCH v2 09/15] cpu-model/s390: Add KVM VM
 attribute interface routines

On Fri, 20 Feb 2015 14:59:20 +0100
Alexander Graf <agraf@...e.de> wrote:

> > +typedef struct S390ProcessorProps {
> > +    uint64_t cpuid;
> > +    uint16_t ibc;
> > +    uint8_t  pad[6];
> > +    uint64_t fac_list[S390_ARCH_FAC_LIST_SIZE_UINT64];
> > +} S390ProcessorProps;
> > +
> > +typedef struct S390MachineProps {
> > +    uint64_t cpuid;
> > +    uint32_t ibc_range;
> > +    uint8_t  pad[4];
> > +    uint64_t fac_list_mask[S390_ARCH_FAC_LIST_SIZE_UINT64];
> > +    uint64_t fac_list[S390_ARCH_FAC_LIST_SIZE_UINT64];
> > +} S390MachineProps;  
> 
> What are those structs there for? To convert between a kvm facing
> interface to an internal interface?

Yes, that's their current use, but if the interface structs: 

+struct kvm_s390_vm_cpu_processor {
+       __u64 cpuid;
+       __u16 ibc;
+       __u8  pad[6];
+       __u64 fac_list[256];
+};
+
+/* kvm S390 machine related attributes are r/o */
+#define KVM_S390_VM_CPU_MACHINE                1
+struct kvm_s390_vm_cpu_machine {
+       __u64 cpuid;
+       __u32 ibc_range;
+       __u8  pad[4];
+       __u64 fac_mask[256];
+       __u64 fac_list[256];
+};

are visible here, I'll reuse them... But stop, that will not work in the 
--disable-kvm case... I need them!
> 
> I don't think they're necessary. The internal layout is visible from the
> KVM code. Just either spawn the class straight from the kvm file or if
> you consider that ugly, pass the values of that struct that you need as
> function parameters to a function in cpu-models.c.

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