On Mon, Mar 07, 2022 at 07:29:22AM -0800, Dave Hansen wrote:
> On 3/7/22 03:27, Jarkko Sakkinen wrote:
> > But e.g. in __mm_populate() anything with (VM_IO | VM_PFNMAP) gets
> > filtered out and never reach that function.
> >
> > I don't know unorthodox that'd be but could we perhaps have a VM
> >
On Mon, Mar 07, 2022 at 02:37:48PM +, Matthew Wilcox wrote:
> On Sun, Mar 06, 2022 at 03:41:54PM -0800, Dave Hansen wrote:
> > In short: page faults stink. The core kernel has lots of ways of
> > avoiding page faults like madvise(MADV_WILLNEED) or mmap(MAP_POPULATE).
> > But, those only work
On 3/7/22 03:27, Jarkko Sakkinen wrote:
> But e.g. in __mm_populate() anything with (VM_IO | VM_PFNMAP) gets
> filtered out and never reach that function.
>
> I don't know unorthodox that'd be but could we perhaps have a VM
> flag for SGX?
SGX only works on a subset of the chips from one vendor o
On Sun, Mar 06, 2022 at 03:41:54PM -0800, Dave Hansen wrote:
> In short: page faults stink. The core kernel has lots of ways of
> avoiding page faults like madvise(MADV_WILLNEED) or mmap(MAP_POPULATE).
> But, those only work on normal RAM that the core mm manages.
>
> SGX is weird. SGX memory i
On Sun, Mar 06, 2022 at 03:24:56PM -0800, Andrew Morton wrote:
> On Sun, 6 Mar 2022 05:26:55 +0200 Jarkko Sakkinen wrote:
>
> > Sometimes you might want to use MAP_POPULATE to ask a device driver to
> > initialize the device memory in some specific manner. SGX driver can use
> > this to request
On Sun, Mar 06, 2022 at 03:41:54PM -0800, Dave Hansen wrote:
> On 3/6/22 15:24, Andrew Morton wrote:
> > On Sun, 6 Mar 2022 05:26:55 +0200 Jarkko Sakkinen
> > wrote:
> >
> >> Sometimes you might want to use MAP_POPULATE to ask a device driver to
> >> initialize the device memory in some specifi
On 3/6/22 15:24, Andrew Morton wrote:
> On Sun, 6 Mar 2022 05:26:55 +0200 Jarkko Sakkinen wrote:
>
>> Sometimes you might want to use MAP_POPULATE to ask a device driver to
>> initialize the device memory in some specific manner. SGX driver can use
>> this to request more memory by issuing ENCLS
On Sun, 6 Mar 2022 05:26:55 +0200 Jarkko Sakkinen wrote:
> Sometimes you might want to use MAP_POPULATE to ask a device driver to
> initialize the device memory in some specific manner. SGX driver can use
> this to request more memory by issuing ENCLS[EAUG] x86 opcode for each
> page in the addr
Sometimes you might want to use MAP_POPULATE to ask a device driver to
initialize the device memory in some specific manner. SGX driver can use
this to request more memory by issuing ENCLS[EAUG] x86 opcode for each
page in the address range.
Add f_ops->populate() with the same parameters as f_ops-
