lkml.org 
[lkml]   [2022]   [Sep]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [RFC PATCH 03/20] x86/sgx: Track owning enclave in VA EPC pages
From
Date
On Thu, 2022-09-22 at 11:55 -0700, Dave Hansen wrote:
> On 9/22/22 10:10, Kristen Carlson Accardi wrote:
> > -struct sgx_epc_page *sgx_alloc_va_page(bool reclaim)
> > +struct sgx_epc_page *sgx_alloc_va_page(struct sgx_encl *encl, bool
> > reclaim)
> >  {
> >         struct sgx_epc_page *epc_page;
> >         int ret;
> > @@ -1218,6 +1219,8 @@ struct sgx_epc_page *sgx_alloc_va_page(bool
> > reclaim)
> >                 return ERR_PTR(-EFAULT);
> >         }
> >  
> > +       epc_page->owner = encl;
> > +
> >         return epc_page;
> >  }
>
> BTW, is there a flag or any other way to tell to what kind of object
> ->owner points?

The owner will only be an sgx_encl type if it is a va page, so to tell
what kind of object owner is, you look at the epc page flags - like
this:
if (epc_page->flags & SGX_EPC_PAGE_ENCLAVE)
encl = ((struct sgx_encl_page *)epc_page->owner)->encl;
else if (epc_page->flags & SGX_EPC_PAGE_VERSION_ARRAY)
encl = epc_page->owner;
...


\
 
 \ /
  Last update: 2022-09-22 22:05    [W:0.171 / U:0.676 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site