Re: [Xen-devel] [PATCH 2/5 v2] libxl: Change the type of console_mfn to xen_pfn_t

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 26/10/17 12:13, Wei Liu wrote:
> On Wed, Oct 25, 2017 at 02:57:05PM +0530, Bhupinder Thakur wrote:
>> Currently the type of console mfn is unsigned long in libxl. This may be
>> an issue for 32-bit toolstack running on 64-bit Xen, where the pfn are
>> 64 bit. To ensure that console_mfn can hold any valid 64-bit pfn, the
>> type of console_mfn is changed to xen_pfn_t.
>>
>> Signed-off-by: Bhupinder Thakur <bhupinder.thakur@xxxxxxxxxx>
>> ---
>> CC: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
>> CC: Wei Liu <wei.liu2@xxxxxxxxxx>
>> CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
>> CC: Julien Grall <julien.grall@xxxxxxx>
>>
>> This patch is as per the review of commit fa1f157
>>     libxl: Fix the bug introduced in commit "libxl: use correct type
>>
>>  tools/libxl/libxl_console.c  | 2 +-
>>  tools/libxl/libxl_dom.c      | 2 +-
>>  tools/libxl/libxl_internal.h | 2 +-
>>  3 files changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/tools/libxl/libxl_console.c b/tools/libxl/libxl_console.c
>> index 6bfc0e5..f2ca689 100644
>> --- a/tools/libxl/libxl_console.c
>> +++ b/tools/libxl/libxl_console.c
>> @@ -329,7 +329,7 @@ int libxl__device_console_add(libxl__gc *gc, uint32_t 
>> domid,
>>          flexarray_append(ro_front, "port");
>>          flexarray_append(ro_front, GCSPRINTF("%"PRIu32, 
>> state->console_port));
>>          flexarray_append(ro_front, "ring-ref");
>> -        flexarray_append(ro_front, GCSPRINTF("%lu", state->console_mfn));
>> +        flexarray_append(ro_front, GCSPRINTF("%"PRIu_xen_pfn, 
>> state->console_mfn));
> Actually, please consider changing console_mfn to console_pfn.

If you are going to make this change, then it is a gfn, not a pfn. 
(console_pfn would be as equally wrong for PV guests as console_mfn is
currently wrong for HVM guest.)

~Andrew

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