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    SubjectRe: [PATCH V3 04/30] x86/sgx: Add wrapper for SGX2 EAUG function
    On Mon, Apr 04, 2022 at 09:49:12AM -0700, Reinette Chatre wrote:
    > Add a wrapper for the EAUG ENCLS leaf function used to
    > add a page to an initialized enclave.
    >
    > EAUG:
    > 1) Stores all properties of the new enclave page in the SGX
    > hardware's Enclave Page Cache Map (EPCM).
    > 2) Sets the PENDING bit in the EPCM entry of the enclave page.
    > This bit is cleared by the enclave by invoking ENCLU leaf
    > function EACCEPT or EACCEPTCOPY.
    >
    > Access from within the enclave to the new enclave page is not
    > possible until the PENDING bit is cleared.
    >
    > Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
    > ---
    > No changes since V2
    >
    > Changes since V1:
    > - Split original patch ("x86/sgx: Add wrappers for SGX2 functions")
    > in three to introduce the SGX2 functions separately (Jarkko).
    > - Rewrite commit message to include how the EPCM within the hardware
    > is changed by the SGX2 function as well as any calling
    > conditions (Jarkko).
    >
    > arch/x86/kernel/cpu/sgx/encls.h | 6 ++++++
    > 1 file changed, 6 insertions(+)
    >
    > diff --git a/arch/x86/kernel/cpu/sgx/encls.h b/arch/x86/kernel/cpu/sgx/encls.h
    > index 7a1ecf704ec1..99004b02e2ed 100644
    > --- a/arch/x86/kernel/cpu/sgx/encls.h
    > +++ b/arch/x86/kernel/cpu/sgx/encls.h
    > @@ -227,4 +227,10 @@ static inline int __emodt(struct sgx_secinfo *secinfo, void *addr)
    > return __encls_ret_2(EMODT, secinfo, addr);
    > }
    >
    > +/* Zero a page of EPC memory and add it to an initialized enclave. */
    > +static inline int __eaug(struct sgx_pageinfo *pginfo, void *addr)
    > +{
    > + return __encls_2(EAUG, pginfo, addr);
    > +}
    > +
    > #endif /* _X86_ENCLS_H */
    > --
    > 2.25.1
    >


    Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>

    BR, Jarkko

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