Re: [PATCH 08/24] xen/arm: Introduce xen_pfn_t for pfn and mfn types

From: Konrad Rzeszutek Wilk
Date: Wed Aug 01 2012 - 10:32:13 EST

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On Thu, Jul 26, 2012 at 04:33:50PM +0100, Stefano Stabellini wrote:
> All the original Xen headers have xen_pfn_t as mfn and pfn type, however
> when they have been imported in Linux, xen_pfn_t has been replaced with
> unsigned long. That might work for x86 and ia64 but it does not for arm.

How come?
> Bring back xen_pfn_t and let each architecture define xen_pfn_t as they
> see fit.

I am OK with this as long as your include a comment in both of the
interface.h saying why this is needed. I am curious why 'unsinged long'
won't work? Is it b/c on ARM you always want a 64-bit type?

>
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> ---
> arch/arm/include/asm/xen/interface.h | 2 ++
> arch/ia64/include/asm/xen/interface.h | 2 +-
> arch/x86/include/asm/xen/interface.h | 2 ++
> include/xen/interface/grant_table.h | 4 ++--
> include/xen/interface/memory.h | 6 +++---
> include/xen/interface/platform.h | 4 ++--
> include/xen/interface/xen.h | 6 +++---
> include/xen/privcmd.h | 2 --
> 8 files changed, 15 insertions(+), 13 deletions(-)
>
> diff --git a/arch/arm/include/asm/xen/interface.h b/arch/arm/include/asm/xen/interface.h
> index 6c3ab59..76b1ebe 100644
> --- a/arch/arm/include/asm/xen/interface.h
> +++ b/arch/arm/include/asm/xen/interface.h
> @@ -25,6 +25,7 @@
> } while (0)
>
> #ifndef __ASSEMBLY__
> +typedef uint64_t xen_pfn_t;
> /* Guest handles for primitive C types. */
> __DEFINE_GUEST_HANDLE(uchar, unsigned char);
> __DEFINE_GUEST_HANDLE(uint, unsigned int);
> @@ -35,6 +36,7 @@ DEFINE_GUEST_HANDLE(long);
> DEFINE_GUEST_HANDLE(void);
> DEFINE_GUEST_HANDLE(uint64_t);
> DEFINE_GUEST_HANDLE(uint32_t);
> +DEFINE_GUEST_HANDLE(xen_pfn_t);
>
> /* Maximum number of virtual CPUs in multi-processor guests. */
> #define MAX_VIRT_CPUS 1
> diff --git a/arch/ia64/include/asm/xen/interface.h b/arch/ia64/include/asm/xen/interface.h
> index 09d5f7f..9efa068 100644
> --- a/arch/ia64/include/asm/xen/interface.h
> +++ b/arch/ia64/include/asm/xen/interface.h
> @@ -67,6 +67,7 @@
> #define set_xen_guest_handle(hnd, val) do { (hnd).p = val; } while (0)
>
> #ifndef __ASSEMBLY__
> +typedef unsigned long xen_pfn_t;
> /* Guest handles for primitive C types. */
> __DEFINE_GUEST_HANDLE(uchar, unsigned char);
> __DEFINE_GUEST_HANDLE(uint, unsigned int);
> @@ -79,7 +80,6 @@ DEFINE_GUEST_HANDLE(void);
> DEFINE_GUEST_HANDLE(uint64_t);
> DEFINE_GUEST_HANDLE(uint32_t);
>
> -typedef unsigned long xen_pfn_t;
> DEFINE_GUEST_HANDLE(xen_pfn_t);
> #define PRI_xen_pfn "lx"
> #endif
> diff --git a/arch/x86/include/asm/xen/interface.h b/arch/x86/include/asm/xen/interface.h
> index cbf0c9d..24c1b07 100644
> --- a/arch/x86/include/asm/xen/interface.h
> +++ b/arch/x86/include/asm/xen/interface.h
> @@ -47,6 +47,7 @@
> #endif
>
> #ifndef __ASSEMBLY__
> +typedef unsigned long xen_pfn_t;
> /* Guest handles for primitive C types. */
> __DEFINE_GUEST_HANDLE(uchar, unsigned char);
> __DEFINE_GUEST_HANDLE(uint, unsigned int);
> @@ -57,6 +58,7 @@ DEFINE_GUEST_HANDLE(long);
> DEFINE_GUEST_HANDLE(void);
> DEFINE_GUEST_HANDLE(uint64_t);
> DEFINE_GUEST_HANDLE(uint32_t);
> +DEFINE_GUEST_HANDLE(xen_pfn_t);
> #endif
>
> #ifndef HYPERVISOR_VIRT_START
> diff --git a/include/xen/interface/grant_table.h b/include/xen/interface/grant_table.h
> index a17d844..7da811b 100644
> --- a/include/xen/interface/grant_table.h
> +++ b/include/xen/interface/grant_table.h
> @@ -338,7 +338,7 @@ DEFINE_GUEST_HANDLE_STRUCT(gnttab_dump_table);
> #define GNTTABOP_transfer 4
> struct gnttab_transfer {
> /* IN parameters. */
> - unsigned long mfn;
> + xen_pfn_t mfn;
> domid_t domid;
> grant_ref_t ref;
> /* OUT parameters. */
> @@ -375,7 +375,7 @@ struct gnttab_copy {
> struct {
> union {
> grant_ref_t ref;
> - unsigned long gmfn;
> + xen_pfn_t gmfn;
> } u;
> domid_t domid;
> uint16_t offset;
> diff --git a/include/xen/interface/memory.h b/include/xen/interface/memory.h
> index eac3ce1..abbbff0 100644
> --- a/include/xen/interface/memory.h
> +++ b/include/xen/interface/memory.h
> @@ -31,7 +31,7 @@ struct xen_memory_reservation {
> * OUT: GMFN bases of extents that were allocated
> * (NB. This command also updates the mach_to_phys translation table)
> */
> - GUEST_HANDLE(ulong) extent_start;
> + GUEST_HANDLE(xen_pfn_t) extent_start;
>
> /* Number of extents, and size/alignment of each (2^extent_order pages). */
> unsigned long nr_extents;
> @@ -130,7 +130,7 @@ struct xen_machphys_mfn_list {
> * any large discontiguities in the machine address space, 2MB gaps in
> * the machphys table will be represented by an MFN base of zero.
> */
> - GUEST_HANDLE(ulong) extent_start;
> + GUEST_HANDLE(xen_pfn_t) extent_start;
>
> /*
> * Number of extents written to the above array. This will be smaller
> @@ -172,7 +172,7 @@ struct xen_add_to_physmap {
> unsigned long idx;
>
> /* GPFN where the source mapping page should appear. */
> - unsigned long gpfn;
> + xen_pfn_t gpfn;
> };
> DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap);
>
> diff --git a/include/xen/interface/platform.h b/include/xen/interface/platform.h
> index 486653f..0bea470 100644
> --- a/include/xen/interface/platform.h
> +++ b/include/xen/interface/platform.h
> @@ -54,7 +54,7 @@ DEFINE_GUEST_HANDLE_STRUCT(xenpf_settime_t);
> #define XENPF_add_memtype 31
> struct xenpf_add_memtype {
> /* IN variables. */
> - unsigned long mfn;
> + xen_pfn_t mfn;
> uint64_t nr_mfns;
> uint32_t type;
> /* OUT variables. */
> @@ -84,7 +84,7 @@ struct xenpf_read_memtype {
> /* IN variables. */
> uint32_t reg;
> /* OUT variables. */
> - unsigned long mfn;
> + xen_pfn_t mfn;
> uint64_t nr_mfns;
> uint32_t type;
> };
> diff --git a/include/xen/interface/xen.h b/include/xen/interface/xen.h
> index 4f29f33..d59a991 100644
> --- a/include/xen/interface/xen.h
> +++ b/include/xen/interface/xen.h
> @@ -192,7 +192,7 @@ struct mmuext_op {
> unsigned int cmd;
> union {
> /* [UN]PIN_TABLE, NEW_BASEPTR, NEW_USER_BASEPTR */
> - unsigned long mfn;
> + xen_pfn_t mfn;
> /* INVLPG_LOCAL, INVLPG_ALL, SET_LDT */
> unsigned long linear_addr;
> } arg1;
> @@ -432,11 +432,11 @@ struct start_info {
> unsigned long nr_pages; /* Total pages allocated to this domain. */
> unsigned long shared_info; /* MACHINE address of shared info struct. */
> uint32_t flags; /* SIF_xxx flags. */
> - unsigned long store_mfn; /* MACHINE page number of shared page. */
> + xen_pfn_t store_mfn; /* MACHINE page number of shared page. */
> uint32_t store_evtchn; /* Event channel for store communication. */
> union {
> struct {
> - unsigned long mfn; /* MACHINE page number of console page. */
> + xen_pfn_t mfn; /* MACHINE page number of console page. */
> uint32_t evtchn; /* Event channel for console page. */
> } domU;
> struct {
> diff --git a/include/xen/privcmd.h b/include/xen/privcmd.h
> index 4d58881..45c1aa1 100644
> --- a/include/xen/privcmd.h
> +++ b/include/xen/privcmd.h
> @@ -37,8 +37,6 @@
> #include <linux/compiler.h>
> #include <xen/interface/xen.h>
>
> -typedef unsigned long xen_pfn_t;
> -
> struct privcmd_hypercall {
> __u64 op;
> __u64 arg[5];
> --
> 1.7.2.5
--
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Next message: Oleg Nesterov: "Re: Q: user_enable_single_step() && update_debugctlmsr()"
Previous message: Arnd Bergmann: "Re: [PATCH 5/6] ARM: ux500: Ensure probing of Audio devices when Device Tree is enabled"
Next in thread: Stefano Stabellini: "Re: [PATCH 08/24] xen/arm: Introduce xen_pfn_t for pfn and mfntypes"
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