Messages in this thread | | | Date | Tue, 8 Oct 2019 11:09:31 +0200 | From | Borislav Petkov <> | Subject | Re: [PATCH v22 09/24] x86/sgx: Add functions to allocate and free EPC pages |
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On Mon, Oct 07, 2019 at 07:50:11AM -0700, Sean Christopherson wrote: > The caller is responsible for ensuring EREMOVE can be safely executed, > e.g. by holding the enclave's lock.
lockdep_assert_held() here maybe?
> For many ENCLS leafs, EREMOVE included, the CPU requires exclusive access > to the SGX Enclave Control Structures (SECS)[*] and will signal a #GP if > a different logical CPU is already executing an ENCLS leaf that requires > exclusive SECS access. The SGX subsystem uses a per-enclave mutex to > serialize such ENCLS leafs, among other things. > > [*] The SECS is a per-enclave page that resides in the EPC and can only be > directly accessed by the CPU. It's used to track metadata about the > enclave, e.g. number of child pages, base, size, etc...
Ok.
-- Regards/Gruss, Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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