From: Sean Christopherson Date: Fri, 19 Mar 2021 07:22:20 +0000 (+1300) Subject: x86/sgx: Add SGX_CHILD_PRESENT hardware error code X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=231d3dbdda192e3b3c7b79f4c3b0616f6c7f31b7;p=linux.git x86/sgx: Add SGX_CHILD_PRESENT hardware error code SGX driver can accurately track how enclave pages are used. This enables SECS to be specifically targeted and EREMOVE'd only after all child pages have been EREMOVE'd. This ensures that SGX driver will never encounter SGX_CHILD_PRESENT in normal operation. Virtual EPC is different. The host does not track how EPC pages are used by the guest, so it cannot guarantee EREMOVE success. It might, for instance, encounter a SECS with a non-zero child count. Add a definition of SGX_CHILD_PRESENT. It will be used exclusively by the SGX virtualization driver to handle recoverable EREMOVE errors when saniziting EPC pages after they are freed. Signed-off-by: Sean Christopherson Signed-off-by: Kai Huang Signed-off-by: Borislav Petkov Acked-by: Dave Hansen Acked-by: Jarkko Sakkinen Link: https://lkml.kernel.org/r/050b198e882afde7e6eba8e6a0d4da39161dbb5a.1616136308.git.kai.huang@intel.com --- diff --git a/arch/x86/kernel/cpu/sgx/arch.h b/arch/x86/kernel/cpu/sgx/arch.h index dd7602c44c726..abf99bb71fdc4 100644 --- a/arch/x86/kernel/cpu/sgx/arch.h +++ b/arch/x86/kernel/cpu/sgx/arch.h @@ -26,12 +26,14 @@ * enum sgx_return_code - The return code type for ENCLS, ENCLU and ENCLV * %SGX_NOT_TRACKED: Previous ETRACK's shootdown sequence has not * been completed yet. + * %SGX_CHILD_PRESENT SECS has child pages present in the EPC. * %SGX_INVALID_EINITTOKEN: EINITTOKEN is invalid and enclave signer's * public key does not match IA32_SGXLEPUBKEYHASH. * %SGX_UNMASKED_EVENT: An unmasked event, e.g. INTR, was received */ enum sgx_return_code { SGX_NOT_TRACKED = 11, + SGX_CHILD_PRESENT = 13, SGX_INVALID_EINITTOKEN = 16, SGX_UNMASKED_EVENT = 128, };