x86/sgx: Mark PCMD page as dirty when modifying contents
Recent commit 08999b24 ("x86/sgx: Free backing memory after faulting the enclave page") expanded __sgx_encl_eldu() to clear an enclave page's PCMD (Paging Crypto MetaData) from the PCMD page in the backing store after the enclave page is restored to the enclave. Since the PCMD page in the backing store is modified the page should be marked as dirty to ensure the modified data is retained. Cc: stable@vger.kernel.org Fixes: 08999b24 ("x86/sgx: Free backing memory after faulting the enclave page") Signed-off-by: NReinette Chatre <reinette.chatre@intel.com> Signed-off-by: NDave Hansen <dave.hansen@linux.intel.com> Reviewed-by: NJarkko Sakkinen <jarkko@kernel.org> Tested-by: NHaitao Huang <haitao.huang@intel.com> Link: https://lkml.kernel.org/r/00cd2ac480db01058d112e347b32599c1a806bc4.1652389823.git.reinette.chatre@intel.com
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