Re: [Xen-devel] [PATCH 05/14] xen: balloon: use correct type for frame_list

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2012-10-05 at 17:11 +0100, Ian Campbell wrote:
> On Fri, 2012-10-05 at 15:33 +0100, Ian Campbell wrote:
> > The issue you describe could only happen for a 32 bit HAP guest if the
> > guests was given > 16GB (2^(32+PAGE_SHIFT) bytes) of RAM and it was
> > explicitly trying to balloon memory over that limit, but in order for
> > that to even be possible it would already need to have made its concept
> > of a pfn larger than 32 bits.
> 
> The one place this might matter is in the privcmd
> IOCTL_PRIVCMD_MMAPBATCH interface for the *foreign* pfn (since a small
> dom0 needs to be able to build a big domU). Luckily that interface
> already uses xen_pfn_t, we just need to be a bit careful in the
> xen_remap_domain_mfn_range case, which Konrad tried to tell me already
> and he was right...
> 
> On ARM that meant the following (built but not executed) patch, I
> suspect the PVH variant needs similar treatment.

NB, this is mostly just a bug fix to "arm: implement foreign mapping
using XENMEM_add_to_physmap_range" and/or "arm: implement remap
interfaces needed for privcmd mappings."

> 8<--------------------------
> 
> diff --git a/arch/arm/include/asm/xen/interface.h 
> b/arch/arm/include/asm/xen/interface.h
> index ae05e56..ad87917 100644
> --- a/arch/arm/include/asm/xen/interface.h
> +++ b/arch/arm/include/asm/xen/interface.h
> @@ -43,6 +43,7 @@ DEFINE_GUEST_HANDLE(void);
>  DEFINE_GUEST_HANDLE(uint64_t);
>  DEFINE_GUEST_HANDLE(uint32_t);
>  DEFINE_GUEST_HANDLE(xen_pfn_t);
> +DEFINE_GUEST_HANDLE(xen_ulong_t);
>  
>  /* Maximum number of virtual CPUs in multi-processor guests. */
>  #define MAX_VIRT_CPUS 1
> diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
> index a9946aa..1d64c02 100644
> --- a/arch/arm/xen/enlighten.c
> +++ b/arch/arm/xen/enlighten.c
> @@ -57,7 +57,7 @@ static int map_foreign_page(unsigned long lpfn, unsigned 
> long fgmfn,
>               .size = 1,
>               .space = XENMAPSPACE_gmfn_foreign,
>       };
> -     unsigned long idx = fgmfn;
> +     xen_ulong_t idx = fgmfn;
>       xen_pfn_t gpfn = lpfn;
>  
>       set_xen_guest_handle(xatp.idxs, &idx);
> @@ -73,7 +73,7 @@ static int map_foreign_page(unsigned long lpfn, unsigned 
> long fgmfn,
>  }
>  
>  struct remap_data {
> -     unsigned long fgmfn; /* foreign domain's gmfn */
> +     xen_pfn_t fgmfn; /* foreign domain's gmfn */
>       pgprot_t prot;
>       domid_t  domid;
>       struct vm_area_struct *vma;
> @@ -98,7 +98,7 @@ static int remap_pte_fn(pte_t *ptep, pgtable_t token, 
> unsigned long addr,
>  
>  int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
>                              unsigned long addr,
> -                            unsigned long mfn, int nr,
> +                            xen_pfn_t mfn, int nr,
>                              pgprot_t prot, unsigned domid,
>                              struct xen_remap_mfn_info *info)
>  {
> diff --git a/arch/x86/include/asm/xen/interface.h 
> b/arch/x86/include/asm/xen/interface.h
> index 250c254..d67f3c6 100644
> --- a/arch/x86/include/asm/xen/interface.h
> +++ b/arch/x86/include/asm/xen/interface.h
> @@ -63,6 +63,7 @@ DEFINE_GUEST_HANDLE(void);
>  DEFINE_GUEST_HANDLE(uint64_t);
>  DEFINE_GUEST_HANDLE(uint32_t);
>  DEFINE_GUEST_HANDLE(xen_pfn_t);
> +DEFINE_GUEST_HANDLE(xen_ulong_t);
>  #endif
>  
>  #ifndef HYPERVISOR_VIRT_START
> diff --git a/include/xen/interface/memory.h b/include/xen/interface/memory.h
> index e5675bc..24e5731 100644
> --- a/include/xen/interface/memory.h
> +++ b/include/xen/interface/memory.h
> @@ -199,7 +199,7 @@ struct xen_add_to_physmap_range {
>      domid_t foreign_domid; /* IFF gmfn_foreign */
>  
>      /* Indexes into space being mapped. */
> -    GUEST_HANDLE(ulong) idxs;
> +    GUEST_HANDLE(xen_ulong_t) idxs;
>  
>      /* GPFN in domid where the source mapping page should appear. */
>      GUEST_HANDLE(xen_pfn_t) gpfns;
> diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
> index 2f3cb06..59309f3 100644
> --- a/include/xen/xen-ops.h
> +++ b/include/xen/xen-ops.h
> @@ -27,7 +27,7 @@ struct vm_area_struct;
>  struct xen_remap_mfn_info;
>  int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
>                              unsigned long addr,
> -                            unsigned long mfn, int nr,
> +                            xen_pfn_t mfn, int nr,
>                              pgprot_t prot, unsigned domid,
>                              struct xen_remap_mfn_info *pvhp);
>  int xen_unmap_domain_mfn_range(struct vm_area_struct *vma,
> 
> 
> 
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