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Mon, 21 Sep 2026 20:08:41 +0000 (GMT) From: Eric Farman To: qemu-devel@nongnu.org Cc: qemu-s390x@nongnu.org, Matthew Rosato , Cornelia Huck , Harald Freudenberger , Eric Farman Subject: [PULL 17/33] target/s390x: Minimal protected key AES XTS support for cpacf pcc instruction Date: Mon, 21 Sep 2026 16:08:14 -0400 Message-ID: <20260921200830.1302919-18-farman@linux.ibm.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260921200830.1302919-1-farman@linux.ibm.com> References: <20260921200830.1302919-1-farman@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: tU-F9ZD-bhjHKi_HZHPfcstx_nxmJgIo X-Authority-Analysis: v=2.4 cv=EOCTQFZC c=1 sm=1 tr=0 ts=6ab18ecc cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=VdqzKS8jKosA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=ML8HfGjnpObMZ2AgGjwA:9 X-Proofpoint-Spam-Info: AW1haW4tMjYwOTIxMDI5NCBTYWx0ZWRfX+1KVqYkheOOV PFyp4KMiZDfGu2GY5Ft1k2qRnuRpFQhqe1/F9Hj8M8IeEDYUPkCljXywpaMYeXM76OzheIEJbZ/ xMeEEfJBtA0493IHt4vsNGgX6p8ywGU= X-Proofpoint-GUID: tU-F9ZD-bhjHKi_HZHPfcstx_nxmJgIo X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTIxMDI5NCBTYWx0ZWRfXydJ5D56ZrU5a PFMZ0BZRttNJxMShZ/9r0NcWN2Ad7h4ZXG4zrt2nVfqnio2et4tWCcJ5lkJ5NOtIx9WHqrgC1u/ V5nIolZlJCz39EqPQ5D6I7ojBH7+Bat0zcl2QSxN170ugdsndGwBkz4NuoVg5BghD2PdqSt59EF MAqONBPfqI1dkjoMp6EAQqvSfjSjmypVgIBEOe9Dd1LrZnMeOo42XPyBjDdRyLJzNeB757ZHMcp HFxFXYhLa8/45VHb5KXOhT46hLSUNa4iUMtZ0+BzKzbuw/PyNPLGBlnSCM2L9/HBVubIRS4V4+K gBOKJb3VjIV5Y3G+N5PDCPr4lSg7iYPyq0I8mAlZz1zCtIAHavBr0T8aMPaNqcSxG7S1HYeYiAT Sv2MKjT3mEn4eiQS9OAJa/Uf1LuHjuLMVTwZmcA6N2tC4OYuV3yp3T+exl399HCCXqdxmabFRdU fDpH4pWDJCbxMLRuIvw== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-21_05,2026-09-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 phishscore=0 priorityscore=1501 clxscore=1015 spamscore=0 adultscore=0 impostorscore=0 lowpriorityscore=0 suspectscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609210294 Received-SPF: pass client-ip=148.163.156.1; envelope-from=farman@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Harald Freudenberger Support CPACF pcc subfunctions PCC-Compute-XTS-Parameter-Encrypted-AES-128 and PCC-Compute-XTS-Parameter-Encrypted-AES-128 but only for the special case block sequential number is 0. However, this covers the s390 PAES XTS implementation in the Linux kernel. Signed-off-by: Harald Freudenberger Tested-by: Holger Dengler Reviewed-by: Ilya Leoshkevich Link: https://lore.kernel.org/qemu-devel/20260824083204.40877-18-freude@linux.ibm.com Signed-off-by: Eric Farman --- target/s390x/gen-features.c | 2 + target/s390x/tcg/cpacf.h | 2 + target/s390x/tcg/cpacf_aes.c | 64 ++++++++++++++++++++++++++++++++ target/s390x/tcg/crypto_helper.c | 4 ++ 4 files changed, 72 insertions(+) diff --git a/target/s390x/gen-features.c b/target/s390x/gen-features.c index 01149a04c5..1ed0d4efeb 100644 --- a/target/s390x/gen-features.c +++ b/target/s390x/gen-features.c @@ -951,6 +951,8 @@ static uint16_t qemu_MAX[] = { S390_FEAT_KMCTR_EAES_256, S390_FEAT_PCC_XTS_AES_128, S390_FEAT_PCC_XTS_AES_256, + S390_FEAT_PCC_XTS_EAES_128, + S390_FEAT_PCC_XTS_EAES_256, S390_FEAT_PCKMO_AES_128, S390_FEAT_PCKMO_AES_192, S390_FEAT_PCKMO_AES_256, diff --git a/target/s390x/tcg/cpacf.h b/target/s390x/tcg/cpacf.h index 15fd860e3a..f0c2e7fb6c 100644 --- a/target/s390x/tcg/cpacf.h +++ b/target/s390x/tcg/cpacf.h @@ -53,5 +53,7 @@ int cpacf_paes_ctr(CPUS390XState *env, const int mmu_idx, uintptr_t ra, uint64_t *src_ptr_reg, uint64_t *src_len_reg, uint64_t *ctr_ptr_reg, uint32_t type, uint8_t fc, uint8_t mod); +int cpacf_paes_pcc(CPUS390XState *env, const int mmu_idx, uintptr_t ra, + uint64_t param_addr, uint8_t fc); #endif /* S390X_CPACF_H */ diff --git a/target/s390x/tcg/cpacf_aes.c b/target/s390x/tcg/cpacf_aes.c index 52f8644468..dbbe5bda64 100644 --- a/target/s390x/tcg/cpacf_aes.c +++ b/target/s390x/tcg/cpacf_aes.c @@ -815,3 +815,67 @@ int cpacf_paes_ctr(CPUS390XState *env, const int mmu_idx, uintptr_t ra, return !len ? 0 : 3; } + +int cpacf_paes_pcc(CPUS390XState *env, const int mmu_idx, uintptr_t ra, + uint64_t param_addr, uint8_t fc) +{ + uint8_t key[32], wkvp[32], tweak[AES_BLOCK_SIZE], buf[AES_BLOCK_SIZE]; + int keysize, i; + AES_KEY exkey; + + switch (fc) { + case CPACF_PCC_XTS_PAES_128: + keysize = 16; + break; + case CPACF_PCC_XTS_PAES_256: + keysize = 32; + break; + default: + g_assert_not_reached(); + } + + /* fetch and check wkvp from param block */ + read_guest_wrap_u8(env, mmu_idx, ra, + param_addr + keysize, wkvp, sizeof(wkvp)); + if (memcmp(wkvp, protkey_wkvp, sizeof(wkvp))) { + /* wkvp mismatch -> return with cc 1 */ + return 1; + } + + /* fetch block sequence nr from param block into buf */ + read_guest_wrap_u8(env, mmu_idx, ra, + param_addr + keysize + sizeof(wkvp) + AES_BLOCK_SIZE, + buf, AES_BLOCK_SIZE); + + /* is the block sequence nr 0 ? */ + for (i = 0; i < AES_BLOCK_SIZE && !buf[i]; i++) { + ; + } + if (i < AES_BLOCK_SIZE) { + /* no, sorry handling of non zero block sequence is not implemented */ + tcg_s390_program_interrupt(env, PGM_SPECIFICATION, ra); + } + + /* fetch protected key from param block */ + read_guest_wrap_u8(env, mmu_idx, ra, param_addr, key, keysize); + /* decrypt the protected key */ + decrypt_protkey(key, keysize); + + /* fetch tweak from param block into tweak */ + read_guest_wrap_u8(env, mmu_idx, ra, + param_addr + keysize + sizeof(wkvp), + tweak, AES_BLOCK_SIZE); + + /* expand key */ + AES_set_encrypt_key(key, keysize * 8, &exkey); + + /* encrypt tweak */ + AES_encrypt(tweak, buf, &exkey); + + /* store encrypted tweak into xts parameter field of the param block */ + write_guest_wrap_u8(env, mmu_idx, ra, + param_addr + keysize + sizeof(wkvp) + 3 * AES_BLOCK_SIZE, + buf, AES_BLOCK_SIZE); + + return 0; +} diff --git a/target/s390x/tcg/crypto_helper.c b/target/s390x/tcg/crypto_helper.c index 44fb7611cd..886f9c72d6 100644 --- a/target/s390x/tcg/crypto_helper.c +++ b/target/s390x/tcg/crypto_helper.c @@ -219,6 +219,10 @@ static int cpacf_pcc(CPUS390XState *env, const int mmu_idx, uintptr_t ra, case CPACF_PCC_XTS_AES_256: rc = cpacf_aes_pcc(env, mmu_idx, ra, env->regs[1], fc); break; + case CPACF_PCC_XTS_PAES_128: + case CPACF_PCC_XTS_PAES_256: + rc = cpacf_paes_pcc(env, mmu_idx, ra, env->regs[1], fc); + break; default: tcg_s390_program_interrupt(env, PGM_SPECIFICATION, ra); } -- 2.55.0