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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=148.163.156.1; envelope-from=walling@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H2=-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: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: borntraeger@de.ibm.com, cohuck@redhat.com, frankja@linux.ibm.com, david@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1637162723711100001 Content-Type: text/plain; charset="utf-8" The CPNC portion of the diag318 data is erroneously reset during an initial CPU reset caused by SIGP. Let's go ahead and relocate the diag318_info field within the CPUS390XState struct such that it is only zeroed during a clear reset. This way, the CPNC will be retained for each VCPU in the configuration after the diag318 instruction has been invoked. The s390_machine_reset code already takes care of zeroing the diag318 data on VM resets, which also cover resets caused by diag308. Signed-off-by: Collin Walling Fixes: fabdada9357b ("s390: guest support for diagnose 0x318") Reported-by: Christian Borntraeger Reviewed-by: Janosch Frank Reviewed-by: Christian Borntraeger =20 --- Changelog: v4 - fixed up commit message and added r-b's v3 - reverted changes from previous versions - simply relocate diag318_info in CPU State struct - add comment in set_diag318 to explain resets v2 - handler uses run_on_cpu again - reworded commit message slightly - added fixes and reported-by tags=20 v3 - nixed code reduction changes - added a comment to diag318 handler to briefly describe when relevent data is zeroed --- target/s390x/cpu.h | 4 ++-- target/s390x/kvm/kvm.c | 4 ++++ 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h index 3153d053e9..88aace36ff 100644 --- a/target/s390x/cpu.h +++ b/target/s390x/cpu.h @@ -63,6 +63,8 @@ struct CPUS390XState { uint64_t etoken; /* etoken */ uint64_t etoken_extension; /* etoken extension */ =20 + uint64_t diag318_info; + /* Fields up to this point are not cleared by initial CPU reset */ struct {} start_initial_reset_fields; =20 @@ -118,8 +120,6 @@ struct CPUS390XState { uint16_t external_call_addr; DECLARE_BITMAP(emergency_signals, S390_MAX_CPUS); =20 - uint64_t diag318_info; - #if !defined(CONFIG_USER_ONLY) uint64_t tlb_fill_tec; /* translation exception code during tlb_fill= */ int tlb_fill_exc; /* exception number seen during tlb_fill */ diff --git a/target/s390x/kvm/kvm.c b/target/s390x/kvm/kvm.c index 5b1fdb55c4..6acf14d5ec 100644 --- a/target/s390x/kvm/kvm.c +++ b/target/s390x/kvm/kvm.c @@ -1585,6 +1585,10 @@ void kvm_s390_set_diag318(CPUState *cs, uint64_t dia= g318_info) env->diag318_info =3D diag318_info; cs->kvm_run->s.regs.diag318 =3D diag318_info; cs->kvm_run->kvm_dirty_regs |=3D KVM_SYNC_DIAG318; + /* + * diag 318 info is zeroed during a clear reset and + * diag 308 IPL subcodes. + */ } } =20 --=20 2.31.1