Re: [PATCH v2] KVM: Clean up vm creation and release

[Avi Kivity <avi@redhat.com>]

On 11/10/2010 12:18 PM, Jan Kiszka wrote:
> Am 10.11.2010 10:45, Avi Kivity wrote:
> >  On 11/10/2010 11:30 AM, Jan Kiszka wrote:
> >>  Am 10.11.2010 10:17, Avi Kivity wrote:
> >>>   On 11/09/2010 11:01 PM, Alexander Graf wrote:
> >>>>   On 09.11.2010, at 17:02, Jan Kiszka wrote:
> >>>>
> >>>>>    IA64 support forces us to abstract the allocation of the kvm structure.
> >>>>>    But instead of mixing this up with arch-specific initialization and
> >>>>>    doing the same on destruction, split both steps. This allows to move
> >>>>>    generic destruction calls into generic code.
> >>>>>
> >>>>>    It also fixes error clean-up on failures of kvm_create_vm for IA64.
> >>>>>
> >>>>>    Signed-off-by: Jan Kiszka<jan.kiszka@siemens.com>
> >>>>>    ---
> >>>>>
> >>>>>    Changes in v2:
> >>>>>    - Fixed s390 conversion and added linux/slab.h
> >>>>>      as remarked by Christian (thanks!)
> >>>>>
> >>>>>    arch/ia64/include/asm/kvm_host.h |    4 ++++
> >>>>>    arch/ia64/kvm/kvm-ia64.c         |   28 +++++++---------------------
> >>>>>    arch/powerpc/kvm/powerpc.c       |   20 +++-----------------
> >>>>>    arch/s390/kvm/kvm-s390.c         |   23 ++++++-----------------
> >>>>>    arch/x86/kvm/x86.c               |   12 ++----------
> >>>>>    include/linux/kvm_host.h         |   15 ++++++++++++++-
> >>>>>    virt/kvm/kvm_main.c              |   19 +++++++++++++------
> >>>>>    7 files changed, 49 insertions(+), 72 deletions(-)
> >>>>>
> >>>>>    diff --git a/arch/ia64/include/asm/kvm_host.h b/arch/ia64/include/asm/kvm_host.h
> >>>>>    index 2f229e5..2689ee5 100644
> >>>>>    --- a/arch/ia64/include/asm/kvm_host.h
> >>>>>    +++ b/arch/ia64/include/asm/kvm_host.h
> >>>>>    @@ -590,6 +590,10 @@ int kvm_emulate_halt(struct kvm_vcpu *vcpu);
> >>>>>    int kvm_pal_emul(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run);
> >>>>>    void kvm_sal_emul(struct kvm_vcpu *vcpu);
> >>>>>
> >>>>>    +#define __KVM_HAVE_ARCH_VM_ALLOC 1
> >>>>>    +struct kvm *kvm_arch_alloc_vm(void);
> >>>>>    +void kvm_arch_free_vm(struct kvm *kvm);
> >>>>>    +
> >>>>>    #endif /* __ASSEMBLY__*/
> >>>>>
> >>>>>    #endif
> >>>>>    diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
> >>>>>    index f56a631..48a48bd 100644
> >>>>>    --- a/arch/ia64/kvm/kvm-ia64.c
> >>>>>    +++ b/arch/ia64/kvm/kvm-ia64.c
> >>>>>    @@ -749,7 +749,7 @@ out:
> >>>>>    	return r;
> >>>>>    }
> >>>>>
> >>>>>    -static struct kvm *kvm_alloc_kvm(void)
> >>>>>    +struct kvm *kvm_arch_alloc_vm(void)
> >>>>>    {
> >>>>>
> >>>>>    	struct kvm *kvm;
> >>>>>    @@ -760,7 +760,7 @@ static struct kvm *kvm_alloc_kvm(void)
> >>>>>    	vm_base = __get_free_pages(GFP_KERNEL, get_order(KVM_VM_DATA_SIZE));
> >>>>>
> >>>>>    	if (!vm_base)
> >>>>>    -		return ERR_PTR(-ENOMEM);
> >>>>>    +		return NULL;
> >>>>>
> >>>>>    	memset((void *)vm_base, 0, KVM_VM_DATA_SIZE);
> >>>>>    	kvm = (struct kvm *)(vm_base +
> >>>>>    @@ -806,10 +806,12 @@ static void kvm_build_io_pmt(struct kvm *kvm)
> >>>>>    #define GUEST_PHYSICAL_RR4	0x2739
> >>>>>    #define VMM_INIT_RR		0x1660
> >>>>>
> >>>>>    -static void kvm_init_vm(struct kvm *kvm)
> >>>>>    +int kvm_arch_init_vm(struct kvm *kvm)
> >>>>>    {
> >>>>>    	BUG_ON(!kvm);
> >>>>>
> >>>>>    +	kvm->arch.is_sn2 = ia64_platform_is("sn2");
> >>>>>    +
> >>>>>    	kvm->arch.metaphysical_rr0 = GUEST_PHYSICAL_RR0;
> >>>>>    	kvm->arch.metaphysical_rr4 = GUEST_PHYSICAL_RR4;
> >>>>>    	kvm->arch.vmm_init_rr = VMM_INIT_RR;
> >>>>>    @@ -823,21 +825,8 @@ static void kvm_init_vm(struct kvm *kvm)
> >>>>>
> >>>>>    	/* Reserve bit 0 of irq_sources_bitmap for userspace irq source */
> >>>>>    	set_bit(KVM_USERSPACE_IRQ_SOURCE_ID,&kvm->arch.irq_sources_bitmap);
> >>>>>    -}
> >>>>>    -
> >>>>>    -struct  kvm *kvm_arch_create_vm(void)
> >>>>>    -{
> >>>>>    -	struct kvm *kvm = kvm_alloc_kvm();
> >>>>>    -
> >>>>>    -	if (IS_ERR(kvm))
> >>>>>    -		return ERR_PTR(-ENOMEM);
> >>>>>    -
> >>>>>    -	kvm->arch.is_sn2 = ia64_platform_is("sn2");
> >>>>>    -
> >>>>>    -	kvm_init_vm(kvm);
> >>>>>    -
> >>>>>    -	return kvm;
> >>>>>
> >>>>>    +	return 0;
> >>>>>    }
> >>>>>
> >>>>>    static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm,
> >>>>>    @@ -1357,7 +1346,7 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
> >>>>>    	return -EINVAL;
> >>>>>    }
> >>>>>
> >>>>>    -static void free_kvm(struct kvm *kvm)
> >>>>>    +void kvm_arch_free_vm(struct kvm *kvm)
> >>>>>    {
> >>>>>    	unsigned long vm_base = kvm->arch.vm_base;
> >>>>>
> >>>>>    @@ -1399,9 +1388,6 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
> >>>>>    #endif
> >>>>>    	kfree(kvm->arch.vioapic);
> >>>>>    	kvm_release_vm_pages(kvm);
> >>>>>    -	kvm_free_physmem(kvm);
> >>>>>    -	cleanup_srcu_struct(&kvm->srcu);
> >>>>>    -	free_kvm(kvm);
> >>>>>    }
> >>>>>
> >>>>>    void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
> >>>>>    diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
> >>>>>    index 38f756f..ce3dd65 100644
> >>>>>    --- a/arch/powerpc/kvm/powerpc.c
> >>>>>    +++ b/arch/powerpc/kvm/powerpc.c
> >>>>>    @@ -145,18 +145,12 @@ void kvm_arch_check_processor_compat(void *rtn)
> >>>>>    	*(int *)rtn = kvmppc_core_check_processor_compat();
> >>>>>    }
> >>>>>
> >>>>>    -struct kvm *kvm_arch_create_vm(void)
> >>>>>    +int kvm_arch_init_vm(struct kvm *)
> >>>>
> >>>>   Eh, no. This doesn't compile :).
> >>>
> >>>   What's the problem? lack of a formal argument?
> >>
> >>  The unnamed argument is referenced as 'kvm' in this function.
> >
> >  It isn't referenced:
> >
> >>  int kvm_arch_init_vm(struct kvm *)
> >>  {
> >>      return 0;
> >>  }
> >
>
> Indeed. Anyway, this wasn't intended (even more if some compiler
> versions/settings dislike it).

Ok.  I'll add the name and hope that this was the problem.

-- 
error compiling committee.c: too many arguments to function