Add check to validate whether requested page is part of system RAM
or not before mmap() and error out if its not part of system RAM.
cat /proc/iomem:
-
-27 : System RAM
28-2f : namespace0.0
2000-2027 : System RAM
2028-202f
* Vasant Hegde [2019-10-02 13:18:56]:
> Add check to validate whether requested page is part of system RAM
> or not before mmap() and error out if its not part of system RAM.
>
> cat /proc/iomem:
> -
> -27 : System RAM
> 28-2f : namespace0.0
> 2000
Hi Vasant,
> Add check to validate whether requested page is part of system RAM
> or not before mmap() and error out if its not part of system RAM.
opal_prd_range_is_valid() will return false if the reserved memory range
does not have an ibm,prd-label property. If this you're getting invalid
memo
On 10/3/19 7:17 AM, Jeremy Kerr wrote:
Hi Vasant,
Jeremy,
Add check to validate whether requested page is part of system RAM
or not before mmap() and error out if its not part of system RAM.
opal_prd_range_is_valid() will return false if the reserved memory range
does not have an ibm,prd-
Hi Vasant,
> Correct. We will have `ibm,prd-label` property. That's not the issue.
It sure sounds like the issue - someone has represented a range that
should be mapped by HBRT, but isn't appropriate for mapping by HBRT.
> Here issueis HBRT is loaded into NVDIMM memory.
OK. How about we just d
On 10/3/19 10:26 AM, Jeremy Kerr wrote:
Hi Vasant,
Correct. We will have `ibm,prd-label` property. That's not the issue.
It sure sounds like the issue - someone has represented a range that
should be mapped by HBRT, but isn't appropriate for mapping by HBRT.
Here issueis HBRT is loaded into
Hi Vasant,
> > OK. How about we just don't do that?
>
> Yes. Hostboot will fix that. It will make sure that HBRT is loaded
> into regular memory.
Super.
> > It sounds like we're just trying to work around an invalid
> > representation of the mappings.
>
> Its not workaround. Its additional che
* Jeremy Kerr [2019-10-03 15:07:24]:
> Hi Vasant,
>
> > > OK. How about we just don't do that?
> >
> > Yes. Hostboot will fix that. It will make sure that HBRT is loaded
> > into regular memory.
>
> Super.
>
> > > It sounds like we're just trying to work around an invalid
> > > representation
Hi Vaidy,
The current topic is who owns setting up the ATT bits for that piece
of memory. It is the kernel today. Kernel decides to set this up as
normal memory or I/O memory and sets the bits in page table entry.
Or, what if there's a range of address-space that isn't backed by system
RAM (
* Jeremy Kerr [2019-10-04 11:27:46]:
> Hi Vaidy,
>
> > The current topic is who owns setting up the ATT bits for that piece
> > of memory. It is the kernel today. Kernel decides to set this up as
> > normal memory or I/O memory and sets the bits in page table entry.
> >
> > > Or, what if ther
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