From patchwork Mon May 20 23:32:34 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Salil Mehta X-Patchwork-Id: 13668723 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id CD42DC25B77 for ; Mon, 20 May 2024 23:34:31 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1s9CVy-0004zM-PH; Mon, 20 May 2024 19:33:58 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1s9CVw-0004yJ-PE; Mon, 20 May 2024 19:33:56 -0400 Received: from frasgout.his.huawei.com ([185.176.79.56]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1s9CVt-0001c9-NR; Mon, 20 May 2024 19:33:55 -0400 Received: from mail.maildlp.com (unknown [172.18.186.231]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4Vjv4v3c4yz6J682; Tue, 21 May 2024 07:33:03 +0800 (CST) Received: from lhrpeml500001.china.huawei.com (unknown [7.191.163.213]) by mail.maildlp.com (Postfix) with ESMTPS id 2425F1400D4; Tue, 21 May 2024 07:33:51 +0800 (CST) Received: from 00293818-MRGF.china.huawei.com (10.126.174.235) by lhrpeml500001.china.huawei.com (7.191.163.213) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Tue, 21 May 2024 00:33:28 +0100 To: , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Jonathan Cameron , Shaoqin Huang Subject: [PATCH V10 1/8] accel/kvm: Extract common KVM vCPU {creation, parking} code Date: Tue, 21 May 2024 00:32:34 +0100 Message-ID: <20240520233241.229675-2-salil.mehta@huawei.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240520233241.229675-1-salil.mehta@huawei.com> References: <20240520233241.229675-1-salil.mehta@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.126.174.235] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To lhrpeml500001.china.huawei.com (7.191.163.213) Received-SPF: pass client-ip=185.176.79.56; envelope-from=salil.mehta@huawei.com; helo=frasgout.his.huawei.com X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, 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: , Reply-to: Salil Mehta X-Patchwork-Original-From: Salil Mehta via From: Salil Mehta Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org KVM vCPU creation is done once during the vCPU realization when Qemu vCPU thread is spawned. This is common to all the architectures as of now. Hot-unplug of vCPU results in destruction of the vCPU object in QOM but the corresponding KVM vCPU object in the Host KVM is not destroyed as KVM doesn't support vCPU removal. Therefore, its representative KVM vCPU object/context in Qemu is parked. Refactor architecture common logic so that some APIs could be reused by vCPU Hotplug code of some architectures likes ARM, Loongson etc. Update new/old APIs with trace events. No functional change is intended here. Signed-off-by: Salil Mehta Reviewed-by: Gavin Shan Tested-by: Vishnu Pajjuri Reviewed-by: Jonathan Cameron Tested-by: Xianglai Li Tested-by: Miguel Luis Reviewed-by: Shaoqin Huang Reviewed-by: Vishnu Pajjuri Reviewed-by: Nicholas Piggin --- accel/kvm/kvm-all.c | 97 ++++++++++++++++++++++++++++-------------- accel/kvm/kvm-cpus.h | 23 ++++++++++ accel/kvm/trace-events | 5 ++- 3 files changed, 92 insertions(+), 33 deletions(-) diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index c0be9f5eed..a8f93078dc 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -340,14 +340,73 @@ err: return ret; } +void kvm_park_vcpu(CPUState *cpu) +{ + struct KVMParkedVcpu *vcpu; + + trace_kvm_park_vcpu(cpu->cpu_index, kvm_arch_vcpu_id(cpu)); + + vcpu = g_malloc0(sizeof(*vcpu)); + vcpu->vcpu_id = kvm_arch_vcpu_id(cpu); + vcpu->kvm_fd = cpu->kvm_fd; + QLIST_INSERT_HEAD(&kvm_state->kvm_parked_vcpus, vcpu, node); +} + +int kvm_unpark_vcpu(KVMState *s, unsigned long vcpu_id) +{ + struct KVMParkedVcpu *cpu; + + QLIST_FOREACH(cpu, &s->kvm_parked_vcpus, node) { + if (cpu->vcpu_id == vcpu_id) { + int kvm_fd; + + trace_kvm_unpark_vcpu(vcpu_id); + + QLIST_REMOVE(cpu, node); + kvm_fd = cpu->kvm_fd; + g_free(cpu); + return kvm_fd; + } + } + + return -ENOENT; +} + +int kvm_create_vcpu(CPUState *cpu) +{ + unsigned long vcpu_id = kvm_arch_vcpu_id(cpu); + KVMState *s = kvm_state; + int kvm_fd; + + /* check if the KVM vCPU already exist but is parked */ + kvm_fd = kvm_unpark_vcpu(s, vcpu_id); + if (kvm_fd < 0) { + /* vCPU not parked: create a new KVM vCPU */ + kvm_fd = kvm_vm_ioctl(s, KVM_CREATE_VCPU, vcpu_id); + if (kvm_fd < 0) { + error_report("KVM_CREATE_VCPU IOCTL failed for vCPU %lu", vcpu_id); + return kvm_fd; + } + } + + trace_kvm_create_vcpu(cpu->cpu_index, vcpu_id, kvm_fd); + + cpu->kvm_fd = kvm_fd; + cpu->kvm_state = s; + cpu->vcpu_dirty = true; + cpu->dirty_pages = 0; + cpu->throttle_us_per_full = 0; + + return 0; +} + static int do_kvm_destroy_vcpu(CPUState *cpu) { KVMState *s = kvm_state; long mmap_size; - struct KVMParkedVcpu *vcpu = NULL; int ret = 0; - trace_kvm_destroy_vcpu(); + trace_kvm_destroy_vcpu(cpu->cpu_index, kvm_arch_vcpu_id(cpu)); ret = kvm_arch_destroy_vcpu(cpu); if (ret < 0) { @@ -373,10 +432,7 @@ static int do_kvm_destroy_vcpu(CPUState *cpu) } } - vcpu = g_malloc0(sizeof(*vcpu)); - vcpu->vcpu_id = kvm_arch_vcpu_id(cpu); - vcpu->kvm_fd = cpu->kvm_fd; - QLIST_INSERT_HEAD(&kvm_state->kvm_parked_vcpus, vcpu, node); + kvm_park_vcpu(cpu); err: return ret; } @@ -389,24 +445,6 @@ void kvm_destroy_vcpu(CPUState *cpu) } } -static int kvm_get_vcpu(KVMState *s, unsigned long vcpu_id) -{ - struct KVMParkedVcpu *cpu; - - QLIST_FOREACH(cpu, &s->kvm_parked_vcpus, node) { - if (cpu->vcpu_id == vcpu_id) { - int kvm_fd; - - QLIST_REMOVE(cpu, node); - kvm_fd = cpu->kvm_fd; - g_free(cpu); - return kvm_fd; - } - } - - return kvm_vm_ioctl(s, KVM_CREATE_VCPU, (void *)vcpu_id); -} - int kvm_init_vcpu(CPUState *cpu, Error **errp) { KVMState *s = kvm_state; @@ -415,19 +453,14 @@ int kvm_init_vcpu(CPUState *cpu, Error **errp) trace_kvm_init_vcpu(cpu->cpu_index, kvm_arch_vcpu_id(cpu)); - ret = kvm_get_vcpu(s, kvm_arch_vcpu_id(cpu)); + ret = kvm_create_vcpu(cpu); if (ret < 0) { - error_setg_errno(errp, -ret, "kvm_init_vcpu: kvm_get_vcpu failed (%lu)", + error_setg_errno(errp, -ret, + "kvm_init_vcpu: kvm_create_vcpu failed (%lu)", kvm_arch_vcpu_id(cpu)); goto err; } - cpu->kvm_fd = ret; - cpu->kvm_state = s; - cpu->vcpu_dirty = true; - cpu->dirty_pages = 0; - cpu->throttle_us_per_full = 0; - mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0); if (mmap_size < 0) { ret = mmap_size; diff --git a/accel/kvm/kvm-cpus.h b/accel/kvm/kvm-cpus.h index ca40add32c..2e6bb38b5d 100644 --- a/accel/kvm/kvm-cpus.h +++ b/accel/kvm/kvm-cpus.h @@ -22,5 +22,28 @@ bool kvm_supports_guest_debug(void); int kvm_insert_breakpoint(CPUState *cpu, int type, vaddr addr, vaddr len); int kvm_remove_breakpoint(CPUState *cpu, int type, vaddr addr, vaddr len); void kvm_remove_all_breakpoints(CPUState *cpu); +/** + * kvm_create_vcpu - Gets a parked KVM vCPU or creates a KVM vCPU + * @cpu: QOM CPUState object for which KVM vCPU has to be fetched/created. + * + * @returns: 0 when success, errno (<0) when failed. + */ +int kvm_create_vcpu(CPUState *cpu); +/** + * kvm_park_vcpu - Park QEMU KVM vCPU context + * @cpu: QOM CPUState object for which QEMU KVM vCPU context has to be parked. + * + * @returns: none + */ +void kvm_park_vcpu(CPUState *cpu); + +/** + * kvm_unpark_vcpu - unpark QEMU KVM vCPU context + * @s: KVM State + * @cpu: Architecture vCPU ID of the parked vCPU + * + * @returns: KVM fd + */ +int kvm_unpark_vcpu(KVMState *s, unsigned long vcpu_id); #endif /* KVM_CPUS_H */ diff --git a/accel/kvm/trace-events b/accel/kvm/trace-events index 681ccb667d..bd43a0ef26 100644 --- a/accel/kvm/trace-events +++ b/accel/kvm/trace-events @@ -9,6 +9,10 @@ kvm_device_ioctl(int fd, int type, void *arg) "dev fd %d, type 0x%x, arg %p" kvm_failed_reg_get(uint64_t id, const char *msg) "Warning: Unable to retrieve ONEREG %" PRIu64 " from KVM: %s" kvm_failed_reg_set(uint64_t id, const char *msg) "Warning: Unable to set ONEREG %" PRIu64 " to KVM: %s" kvm_init_vcpu(int cpu_index, unsigned long arch_cpu_id) "index: %d id: %lu" +kvm_create_vcpu(int cpu_index, unsigned long arch_cpu_id, int kvm_fd) "index: %d, id: %lu, kvm fd: %d" +kvm_destroy_vcpu(int cpu_index, unsigned long arch_cpu_id) "index: %d id: %lu" +kvm_park_vcpu(int cpu_index, unsigned long arch_cpu_id) "index: %d id: %lu" +kvm_unpark_vcpu(unsigned long arch_cpu_id) "id: %lu" kvm_irqchip_commit_routes(void) "" kvm_irqchip_add_msi_route(char *name, int vector, int virq) "dev %s vector %d virq %d" kvm_irqchip_update_msi_route(int virq) "Updating MSI route virq=%d" @@ -25,7 +29,6 @@ kvm_dirty_ring_reaper(const char *s) "%s" kvm_dirty_ring_reap(uint64_t count, int64_t t) "reaped %"PRIu64" pages (took %"PRIi64" us)" kvm_dirty_ring_reaper_kick(const char *reason) "%s" kvm_dirty_ring_flush(int finished) "%d" -kvm_destroy_vcpu(void) "" kvm_failed_get_vcpu_mmap_size(void) "" kvm_cpu_exec(void) "" kvm_interrupt_exit_request(void) ""