Re: [PATCH 07/25] x86/sgx: Move PTE zap code to separate function

[Reinette Chatre]

Hi Jarkko,

On 12/10/2021 11:52 PM, Jarkko Sakkinen wrote:
> On Mon, 2021-12-06 at 13:30 -0800, Reinette Chatre wrote:
> > Hi Jarkko,
> >
> > On 12/4/2021 2:59 PM, Jarkko Sakkinen wrote:
> > > On Wed, Dec 01, 2021 at 11:23:05AM -0800, Reinette Chatre wrote:
> > > > The SGX reclaimer removes page table entries pointing to pages that are
> > > > moved to swap. SGX2 enables changes to pages belonging to an initialized
> > > > enclave, for example changing page permissions. Supporting SGX2 requires
> > > > this ability to remove page table entries that is available in the
> > > > SGX reclaimer code.
> > >
> > > Missing: why SGX2 requirest this?
> >
> > The above paragraph states that SGX2 needs to remove page table entries
> > because it modifies page permissions. Could you please elaborate what is
> > missing?
>
> It does not say why SGX2 requires an ability to remove page table entries.

Are you saying that modification of EPCM page permissions is not a 
reason to remove page table entries pointing to those pages?

Reinette