Messages in this thread | | | Subject | Re: [RFC PATCH 03/20] x86/sgx: Track owning enclave in VA EPC pages | From | Kristen Carlson Accardi <> | Date | Thu, 22 Sep 2022 13:04:06 -0700 |
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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; ...
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