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Mon, 21 Apr 2025 10:28:54 +0000 (GMT) Received: from smtpav01.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 212902006A; Mon, 21 Apr 2025 10:28:52 +0000 (GMT) Received: from li-7bb28a4c-2dab-11b2-a85c-887b5c60d769.in.ibm.com (unknown [9.109.215.252]) by smtpav01.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 21 Apr 2025 10:28:51 +0000 (GMT) From: Shrikanth Hegde To: maddy@linux.ibm.com, linuxppc-dev@lists.ozlabs.org Cc: npiggin@gmail.com, christophe.leroy@csgroup.eu, sshegde@linux.ibm.com, gautam@linux.ibm.com, vaibhav@linux.ibm.com, bigeasy@linutronix.de, linux-kernel@vger.kernel.org Subject: [PATCH 1/2] powerpc: kvm: use generic transfer to guest mode work Date: Mon, 21 Apr 2025 15:58:36 +0530 Message-ID: <20250421102837.78515-2-sshegde@linux.ibm.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20250421102837.78515-1-sshegde@linux.ibm.com> References: <20250421102837.78515-1-sshegde@linux.ibm.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=Jp7xrN4C c=1 sm=1 tr=0 ts=68061deb cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=XR8D0OoHHMoA:10 a=VnNF1IyMAAAA:8 a=ORXw20NSZVeh7yTWmm0A:9 X-Proofpoint-GUID: hoL7Txpgf8T-Hv-v2-Hffgks_KovU81M X-Proofpoint-ORIG-GUID: JHPzvNKdWUgVSGhHeegJaH4E-lDrZDzp X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1095,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-04-21_04,2025-04-21_02,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 mlxlogscore=999 impostorscore=0 phishscore=0 spamscore=0 adultscore=0 priorityscore=1501 clxscore=1015 mlxscore=0 malwarescore=0 suspectscore=0 bulkscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2502280000 definitions=main-2504210077 X-Spam-Status: No, score=-0.7 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, RCVD_IN_DNSWL_LOW,SPF_HELO_NONE,SPF_PASS autolearn=disabled version=4.0.1 OzLabs 8 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org There is generic entry framework to handle signals and check for reschedule etc before entering the guest. Use that framework for powerpc. Advantages: - Less code duplication. - powerpc kvm now understands NR and NR_lazy bits. - powerpc can enable HAVE_POSIX_CPU_TIMERS_TASK_WORK, currently the powerpc/kvm code doesn't handle TIF_NOTIFY_RESUME. Testing: No splats seen in below cases. - Booted KVM guest on PowerVM and PowerNV systems. - Ran stress-ng CPU stressors in each above case. - On PowerNV host, tried preempt=lazy/full and run stress-ng CPU stressor in the KVM guest. Signed-off-by: Shrikanth Hegde --- arch/powerpc/Kconfig | 1 + arch/powerpc/kvm/book3s_hv.c | 13 +++++++------ arch/powerpc/kvm/powerpc.c | 22 ++++++++-------------- 3 files changed, 16 insertions(+), 20 deletions(-) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 6722625a4..83807ae44 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -299,6 +299,7 @@ config PPC select IRQ_DOMAIN select IRQ_FORCED_THREADING select KASAN_VMALLOC if KASAN && EXECMEM + select KVM_XFER_TO_GUEST_WORK select LOCK_MM_AND_FIND_VMA select MMU_GATHER_PAGE_SIZE select MMU_GATHER_RCU_TABLE_FREE diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 19f4d298d..123539642 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -80,8 +80,8 @@ #include #include #include - #include +#include #include "book3s.h" #include "book3s_hv.h" @@ -4901,7 +4901,7 @@ int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 time_limit, } if (need_resched()) - cond_resched(); + schedule(); kvmppc_update_vpas(vcpu); @@ -5097,10 +5097,11 @@ static int kvmppc_vcpu_run_hv(struct kvm_vcpu *vcpu) return -EINVAL; } - /* No need to go into the guest when all we'll do is come back out */ - if (signal_pending(current)) { - run->exit_reason = KVM_EXIT_INTR; - return -EINTR; + /* use generic frameworks to handle signals, need_resched */ + if (__xfer_to_guest_mode_work_pending()) { + r = xfer_to_guest_mode_handle_work(vcpu); + if (r) + return r; } #ifdef CONFIG_PPC_TRANSACTIONAL_MEM diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 153587741..4ff334532 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -34,6 +34,7 @@ #endif #include #include +#include #include "timing.h" #include "../mm/mmu_decl.h" @@ -80,24 +81,17 @@ int kvmppc_prepare_to_enter(struct kvm_vcpu *vcpu) { int r; + /* use generic framework to handle need resched and signals */ + if (__xfer_to_guest_mode_work_pending()) { + r = xfer_to_guest_mode_handle_work(vcpu); + if (r) + return r; + } + WARN_ON(irqs_disabled()); hard_irq_disable(); while (true) { - if (need_resched()) { - local_irq_enable(); - cond_resched(); - hard_irq_disable(); - continue; - } - - if (signal_pending(current)) { - kvmppc_account_exit(vcpu, SIGNAL_EXITS); - vcpu->run->exit_reason = KVM_EXIT_INTR; - r = -EINTR; - break; - } - vcpu->mode = IN_GUEST_MODE; /* From patchwork Mon Apr 21 10:28:37 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shrikanth Hegde X-Patchwork-Id: 2074979 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=HGd4KV+Z; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=112.213.38.117; helo=lists.ozlabs.org; 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Mon, 21 Apr 2025 10:28:55 +0000 (GMT) From: Shrikanth Hegde To: maddy@linux.ibm.com, linuxppc-dev@lists.ozlabs.org Cc: npiggin@gmail.com, christophe.leroy@csgroup.eu, sshegde@linux.ibm.com, gautam@linux.ibm.com, vaibhav@linux.ibm.com, bigeasy@linutronix.de, linux-kernel@vger.kernel.org Subject: [PATCH 2/2] powerpc: enable to run posix cpu timers in task context Date: Mon, 21 Apr 2025 15:58:37 +0530 Message-ID: <20250421102837.78515-3-sshegde@linux.ibm.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20250421102837.78515-1-sshegde@linux.ibm.com> References: <20250421102837.78515-1-sshegde@linux.ibm.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: ANrOnTUc0fTdogqeRCaOJKbV03qqTskh X-Authority-Analysis: v=2.4 cv=Qt9e3Uyd c=1 sm=1 tr=0 ts=68061dee cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=XR8D0OoHHMoA:10 a=VnNF1IyMAAAA:8 a=rh6EaQSAbPCCfu5Ue3wA:9 X-Proofpoint-GUID: xAlduXUgwNxhcA8mqPvxOZpfVWMJO3y1 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1095,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-04-21_04,2025-04-21_02,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 bulkscore=0 lowpriorityscore=0 phishscore=0 adultscore=0 clxscore=1015 mlxlogscore=931 suspectscore=0 priorityscore=1501 spamscore=0 malwarescore=0 mlxscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2502280000 definitions=main-2504210077 X-Spam-Status: No, score=-0.7 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, RCVD_IN_DNSWL_LOW,SPF_HELO_NONE,SPF_PASS autolearn=disabled version=4.0.1 OzLabs 8 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org Now that all kvm entry to guest paths handle the task work using the generic framework, enable HAVE_POSIX_CPU_TIMERS_TASK_WORK which allows running posix cpu timers in task context instead of running them in hardirq. This would is a necessary step towards enabling PREEMPT_RT on powerNV systems. Signed-off-by: Shrikanth Hegde --- arch/powerpc/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 83807ae44..f42fa4181 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -277,6 +277,7 @@ config PPC select HAVE_PERF_EVENTS_NMI if PPC64 select HAVE_PERF_REGS select HAVE_PERF_USER_STACK_DUMP + select HAVE_POSIX_CPU_TIMERS_TASK_WORK select HAVE_RETHOOK if KPROBES select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_RELIABLE_STACKTRACE