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Thu, 29 Jun 2023 08:35:00 +0000 (GMT) From: Ilya Leoshkevich To: Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Heiko Carstens , Vasily Gorbik , Alexander Gordeev Cc: David Hildenbrand , Sven Schnelle , kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, Jens Freimann , Ilya Leoshkevich Subject: [PATCH 1/2] KVM: s390: interrupt: Fix stepping into interrupt handlers Date: Thu, 29 Jun 2023 10:32:04 +0200 Message-ID: <20230629083452.183274-2-iii@linux.ibm.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230629083452.183274-1-iii@linux.ibm.com> References: <20230629083452.183274-1-iii@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 7gtpBV6AK1LPLqycyqoLLB7RKgXgIuqx X-Proofpoint-ORIG-GUID: C3P-kw2c-x-FDFipZo0X-b1e1TLHrTIo X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-06-28_14,2023-06-27_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 bulkscore=0 phishscore=0 mlxlogscore=999 malwarescore=0 priorityscore=1501 mlxscore=0 clxscore=1015 suspectscore=0 impostorscore=0 spamscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000 definitions=main-2306290075 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Currently, after single-stepping an instruction that causes a program interrupt, GDB ends up on the second instruction of the program interrupt handler. The reason is that vcpu_pre_run() manually delivers the program interrupt, and then __vcpu_run() runs the first handler instruction using the CPUSTAT_P flag. This causes a KVM_SINGLESTEP exit on the second handler instruction. Instead, KVM needs to do a KVM_SINGLESTEP exit after the manual interrupt delivery. Signed-off-by: Ilya Leoshkevich --- arch/s390/kvm/interrupt.c | 10 ++++++++++ arch/s390/kvm/kvm-s390.c | 4 ++-- 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c index 9250fde1f97d..e633ec4f98d8 100644 --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -1392,6 +1392,7 @@ int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu) { struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; int rc = 0; + bool delivered = false; unsigned long irq_type; unsigned long irqs; @@ -1465,6 +1466,15 @@ int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu) WARN_ONCE(1, "Unknown pending irq type %ld", irq_type); clear_bit(irq_type, &li->pending_irqs); } + delivered |= !rc; + } + + if (delivered && guestdbg_sstep_enabled(vcpu)) { + struct kvm_debug_exit_arch *debug_exit = &vcpu->run->debug.arch; + + debug_exit->addr = vcpu->arch.sie_block->gpsw.addr; + debug_exit->type = KVM_SINGLESTEP; + vcpu->guest_debug |= KVM_GUESTDBG_EXIT_PENDING; } set_intercept_indicators(vcpu); diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 39b36562c043..2d66d83b682c 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -4607,7 +4607,7 @@ static int vcpu_pre_run(struct kvm_vcpu *vcpu) if (!kvm_is_ucontrol(vcpu->kvm)) { rc = kvm_s390_deliver_pending_interrupts(vcpu); - if (rc) + if (rc || guestdbg_exit_pending(vcpu)) return rc; } @@ -4734,7 +4734,7 @@ static int __vcpu_run(struct kvm_vcpu *vcpu) do { rc = vcpu_pre_run(vcpu); - if (rc) + if (rc || guestdbg_exit_pending(vcpu)) break; kvm_vcpu_srcu_read_unlock(vcpu);