On 05/08/15 13:19, Boris Ostrovsky wrote:
> On 08/05/2015 06:51 AM, Julien Grall wrote:
>>
>>>> diff --git a/drivers/video/fbdev/xen-fbfront.c
>>>> b/drivers/video/fbdev/xen-fbfront.c
>>>> index 09dc447..25e3cce 100644
>>>> --- a/drivers/video/fbdev/xen-fbfront.c
>>>> +++ b/drivers/video/fbdev/xen-fbfront.c
>>>> @@ -539,7 +539,7 @@ static int xenfb_remove(struct xenbus_device *dev)
>>>> static unsigned long vmalloc_to_mfn(void *address)
>>>> {
>>>> - return pfn_to_mfn(vmalloc_to_pfn(address));
>>>> + return pfn_to_gfn(vmalloc_to_pfn(address));
>>>> }
>>> Are you sure? This will return vmalloc_to_pfn(address)).
>> I guess you mean vmalloc_to_mfn will return vmalloc_to_pfn?
>>
>> If so, it will be only the case on auto-translated case (because pfn ==
>> gfn). In the case of PV, the mfn will be returned.
>
> How will mfn be returned on PV when pfn_to_gfn() is an identity function?
>
> static inline unsigned long pfn_to_gfn(unsigned long pfn)
> {
> return pfn;
> }
The identity function is only for ARM guest which are always
auto-translated (arch/arm/include/asm/xen/page.h).
The x86 version contains a check if the guest is auto-translated or not
(arch/x86/include/asm/xen/page.):
static inline unsigned long pfn_to_gfn(unsigned long pfn)
{
if (xen_feature(XENFEAT_auto_translated_physmap))
return pfn;
else
return pfn_to_mfn(pfn);
}
Regards,
--
Julien Grall
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