From patchwork Sat Sep 4 13:35:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexey Kardashevskiy X-Patchwork-Id: 1524608 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=kvm-ppc-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4H1wfK3dmdz9t0Y for ; Sat, 4 Sep 2021 23:35:53 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231165AbhIDNgv (ORCPT ); Sat, 4 Sep 2021 09:36:51 -0400 Received: from ozlabs.ru ([107.174.27.60]:51800 "EHLO ozlabs.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230379AbhIDNgv (ORCPT ); Sat, 4 Sep 2021 09:36:51 -0400 Received: from fstn1-p1.ozlabs.ibm.com. (localhost [IPv6:::1]) by ozlabs.ru (Postfix) with ESMTP id E3196AE80024; Sat, 4 Sep 2021 09:35:41 -0400 (EDT) From: Alexey Kardashevskiy To: linuxppc-dev@lists.ozlabs.org Cc: Alexey Kardashevskiy , kvm@vger.kernel.org, kvm-ppc@vger.kernel.org, Paolo Bonzini , Michael Ellerman , Fabiano Rosas Subject: [PATCH kernel v2] KVM: PPC: Merge powerpc's debugfs entry content into generic entry Date: Sat, 4 Sep 2021 23:35:32 +1000 Message-Id: <20210904133532.2871562-1-aik@ozlabs.ru> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm-ppc@vger.kernel.org At the moment the generic KVM code creates an "%pid-%fd" entry per a KVM instance; and the PPC HV KVM creates its own at "vm%pid". The Book3E KVM creates its own entry for timings. The problems with the PPC entries are: 1. they do not allow multiple VMs in the same process (which is extremely rare case mostly used by syzkaller fuzzer); 2. prone to race bugs like the generic KVM code had fixed in commit 85cd39af14f4 ("KVM: Do not leak memory for duplicate debugfs directories"). This defines kvm_arch_create_kvm_debugfs() similar to one for vcpus. This defines 2 hooks in kvmppc_ops for allowing specific KVM implementations to add necessary entries. This defines handlers for HV KVM and defines the Book3E debugfs vcpu helper as a handler. This makes use of already existing kvm_arch_create_vcpu_debugfs on PPC. This removes no more used debugfs_dir pointers from PPC kvm_arch structs. Suggested-by: Fabiano Rosas Signed-off-by: Alexey Kardashevskiy --- Changes: v2: * handled powerpc-booke * s/kvm/vm/ in arch hooks --- arch/powerpc/include/asm/kvm_host.h | 7 +++--- arch/powerpc/include/asm/kvm_ppc.h | 2 ++ arch/powerpc/kvm/timing.h | 7 +++--- include/linux/kvm_host.h | 3 +++ arch/powerpc/kvm/book3s_64_mmu_hv.c | 2 +- arch/powerpc/kvm/book3s_64_mmu_radix.c | 2 +- arch/powerpc/kvm/book3s_hv.c | 30 +++++++++----------------- arch/powerpc/kvm/e500.c | 1 + arch/powerpc/kvm/e500mc.c | 1 + arch/powerpc/kvm/powerpc.c | 15 ++++++++++--- arch/powerpc/kvm/timing.c | 20 ++++------------- virt/kvm/kvm_main.c | 3 +++ 12 files changed, 44 insertions(+), 49 deletions(-) diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 2bcac6da0a4b..f29b66cc2163 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -296,7 +296,6 @@ struct kvm_arch { bool dawr1_enabled; pgd_t *pgtable; u64 process_table; - struct dentry *debugfs_dir; struct kvm_resize_hpt *resize_hpt; /* protected by kvm->lock */ #endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */ #ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE @@ -672,7 +671,6 @@ struct kvm_vcpu_arch { u64 timing_min_duration[__NUMBER_OF_KVM_EXIT_TYPES]; u64 timing_max_duration[__NUMBER_OF_KVM_EXIT_TYPES]; u64 timing_last_exit; - struct dentry *debugfs_exit_timing; #endif #ifdef CONFIG_PPC_BOOK3S @@ -828,8 +826,6 @@ struct kvm_vcpu_arch { struct kvmhv_tb_accumulator rm_exit; /* real-mode exit code */ struct kvmhv_tb_accumulator guest_time; /* guest execution */ struct kvmhv_tb_accumulator cede_time; /* time napping inside guest */ - - struct dentry *debugfs_dir; #endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */ }; @@ -868,4 +864,7 @@ static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) {} static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) {} static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {} +#define __KVM_HAVE_ARCH_VCPU_DEBUGFS +#define __KVM_HAVE_ARCH_KVM_DEBUGFS + #endif /* __POWERPC_KVM_HOST_H__ */ diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h index 6355a6980ccf..fd841e844b90 100644 --- a/arch/powerpc/include/asm/kvm_ppc.h +++ b/arch/powerpc/include/asm/kvm_ppc.h @@ -316,6 +316,8 @@ struct kvmppc_ops { int (*svm_off)(struct kvm *kvm); int (*enable_dawr1)(struct kvm *kvm); bool (*hash_v3_possible)(void); + void (*create_vm_debugfs)(struct kvm *kvm); + void (*create_vcpu_debugfs)(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry); }; extern struct kvmppc_ops *kvmppc_hv_ops; diff --git a/arch/powerpc/kvm/timing.h b/arch/powerpc/kvm/timing.h index feef7885ba82..36f7c201c6f1 100644 --- a/arch/powerpc/kvm/timing.h +++ b/arch/powerpc/kvm/timing.h @@ -14,8 +14,8 @@ #ifdef CONFIG_KVM_EXIT_TIMING void kvmppc_init_timing_stats(struct kvm_vcpu *vcpu); void kvmppc_update_timing_stats(struct kvm_vcpu *vcpu); -void kvmppc_create_vcpu_debugfs(struct kvm_vcpu *vcpu, unsigned int id); -void kvmppc_remove_vcpu_debugfs(struct kvm_vcpu *vcpu); +void kvmppc_create_vcpu_debugfs(struct kvm_vcpu *vcpu, + struct dentry *debugfs_dentry); static inline void kvmppc_set_exit_type(struct kvm_vcpu *vcpu, int type) { @@ -27,8 +27,7 @@ static inline void kvmppc_set_exit_type(struct kvm_vcpu *vcpu, int type) static inline void kvmppc_init_timing_stats(struct kvm_vcpu *vcpu) {} static inline void kvmppc_update_timing_stats(struct kvm_vcpu *vcpu) {} static inline void kvmppc_create_vcpu_debugfs(struct kvm_vcpu *vcpu, - unsigned int id) {} -static inline void kvmppc_remove_vcpu_debugfs(struct kvm_vcpu *vcpu) {} + struct dentry *debugfs_dentry) {} static inline void kvmppc_set_exit_type(struct kvm_vcpu *vcpu, int type) {} #endif /* CONFIG_KVM_EXIT_TIMING */ diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index ae7735b490b4..4f22b1201a0d 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -1021,6 +1021,9 @@ int kvm_arch_pm_notifier(struct kvm *kvm, unsigned long state); #ifdef __KVM_HAVE_ARCH_VCPU_DEBUGFS void kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry); #endif +#ifdef __KVM_HAVE_ARCH_KVM_DEBUGFS +void kvm_arch_create_vm_debugfs(struct kvm *kvm); +#endif int kvm_arch_hardware_enable(void); void kvm_arch_hardware_disable(void); diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index c63e263312a4..33dae253a0ac 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -2112,7 +2112,7 @@ static const struct file_operations debugfs_htab_fops = { void kvmppc_mmu_debugfs_init(struct kvm *kvm) { - debugfs_create_file("htab", 0400, kvm->arch.debugfs_dir, kvm, + debugfs_create_file("htab", 0400, kvm->debugfs_dentry, kvm, &debugfs_htab_fops); } diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c index c5508744e14c..f4e083c20872 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_radix.c +++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c @@ -1452,7 +1452,7 @@ static const struct file_operations debugfs_radix_fops = { void kvmhv_radix_debugfs_init(struct kvm *kvm) { - debugfs_create_file("radix", 0400, kvm->arch.debugfs_dir, kvm, + debugfs_create_file("radix", 0400, kvm->debugfs_dentry, kvm, &debugfs_radix_fops); } diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index c8f12b056968..046df9e0d462 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -2771,19 +2771,14 @@ static const struct file_operations debugfs_timings_ops = { }; /* Create a debugfs directory for the vcpu */ -static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id) +static void kvmppc_arch_create_vcpu_debugfs_hv(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry) { - char buf[16]; - struct kvm *kvm = vcpu->kvm; - - snprintf(buf, sizeof(buf), "vcpu%u", id); - vcpu->arch.debugfs_dir = debugfs_create_dir(buf, kvm->arch.debugfs_dir); - debugfs_create_file("timings", 0444, vcpu->arch.debugfs_dir, vcpu, + debugfs_create_file("timings", 0444, debugfs_dentry, vcpu, &debugfs_timings_ops); } #else /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */ -static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id) +static void kvmppc_arch_create_vcpu_debugfs_hv(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry) { } #endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */ @@ -2907,8 +2902,6 @@ static int kvmppc_core_vcpu_create_hv(struct kvm_vcpu *vcpu) vcpu->arch.cpu_type = KVM_CPU_3S_64; kvmppc_sanity_check(vcpu); - debugfs_vcpu_init(vcpu, id); - return 0; } @@ -5186,7 +5179,6 @@ void kvmppc_free_host_rm_ops(void) static int kvmppc_core_init_vm_hv(struct kvm *kvm) { unsigned long lpcr, lpid; - char buf[32]; int ret; mutex_init(&kvm->arch.uvmem_lock); @@ -5319,16 +5311,14 @@ static int kvmppc_core_init_vm_hv(struct kvm *kvm) kvm->arch.smt_mode = 1; kvm->arch.emul_smt_mode = 1; - /* - * Create a debugfs directory for the VM - */ - snprintf(buf, sizeof(buf), "vm%d", current->pid); - kvm->arch.debugfs_dir = debugfs_create_dir(buf, kvm_debugfs_dir); + return 0; +} + +static void kvmppc_arch_create_vm_debugfs_hv(struct kvm *kvm) +{ kvmppc_mmu_debugfs_init(kvm); if (radix_enabled()) kvmhv_radix_debugfs_init(kvm); - - return 0; } static void kvmppc_free_vcores(struct kvm *kvm) @@ -5342,8 +5332,6 @@ static void kvmppc_free_vcores(struct kvm *kvm) static void kvmppc_core_destroy_vm_hv(struct kvm *kvm) { - debugfs_remove_recursive(kvm->arch.debugfs_dir); - if (!cpu_has_feature(CPU_FTR_ARCH_300)) kvm_hv_vm_deactivated(); @@ -5996,6 +5984,8 @@ static struct kvmppc_ops kvm_ops_hv = { .svm_off = kvmhv_svm_off, .enable_dawr1 = kvmhv_enable_dawr1, .hash_v3_possible = kvmppc_hash_v3_possible, + .create_vcpu_debugfs = kvmppc_arch_create_vcpu_debugfs_hv, + .create_vm_debugfs = kvmppc_arch_create_vm_debugfs_hv, }; static int kvm_init_subcore_bitmap(void) diff --git a/arch/powerpc/kvm/e500.c b/arch/powerpc/kvm/e500.c index 7e8b69015d20..d82e70c3e0a9 100644 --- a/arch/powerpc/kvm/e500.c +++ b/arch/powerpc/kvm/e500.c @@ -495,6 +495,7 @@ static struct kvmppc_ops kvm_ops_e500 = { .emulate_op = kvmppc_core_emulate_op_e500, .emulate_mtspr = kvmppc_core_emulate_mtspr_e500, .emulate_mfspr = kvmppc_core_emulate_mfspr_e500, + .create_vcpu_debugfs = kvmppc_create_vcpu_debugfs, }; static int __init kvmppc_e500_init(void) diff --git a/arch/powerpc/kvm/e500mc.c b/arch/powerpc/kvm/e500mc.c index 1c189b5aadcc..45eacd949f4b 100644 --- a/arch/powerpc/kvm/e500mc.c +++ b/arch/powerpc/kvm/e500mc.c @@ -381,6 +381,7 @@ static struct kvmppc_ops kvm_ops_e500mc = { .emulate_op = kvmppc_core_emulate_op_e500, .emulate_mtspr = kvmppc_core_emulate_mtspr_e500, .emulate_mfspr = kvmppc_core_emulate_mfspr_e500, + .create_vcpu_debugfs = kvmppc_create_vcpu_debugfs, }; static int __init kvmppc_e500mc_init(void) diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index c248d6d8b9e3..c895521ac6e9 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -763,7 +763,6 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) goto out_vcpu_uninit; vcpu->arch.waitp = &vcpu->wait; - kvmppc_create_vcpu_debugfs(vcpu, vcpu->vcpu_id); return 0; out_vcpu_uninit: @@ -780,8 +779,6 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) /* Make sure we're not using the vcpu anymore */ hrtimer_cancel(&vcpu->arch.dec_timer); - kvmppc_remove_vcpu_debugfs(vcpu); - switch (vcpu->arch.irq_type) { case KVMPPC_IRQ_MPIC: kvmppc_mpic_disconnect_vcpu(vcpu->arch.mpic, vcpu); @@ -2505,3 +2502,15 @@ int kvm_arch_init(void *opaque) } EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_ppc_instr); + +void kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry) +{ + if (vcpu->kvm->arch.kvm_ops->create_vcpu_debugfs) + vcpu->kvm->arch.kvm_ops->create_vcpu_debugfs(vcpu, debugfs_dentry); +} + +void kvm_arch_create_vm_debugfs(struct kvm *kvm) +{ + if (kvm->arch.kvm_ops->create_vm_debugfs) + kvm->arch.kvm_ops->create_vm_debugfs(kvm); +} diff --git a/arch/powerpc/kvm/timing.c b/arch/powerpc/kvm/timing.c index ba56a5cbba97..e1c17afc714d 100644 --- a/arch/powerpc/kvm/timing.c +++ b/arch/powerpc/kvm/timing.c @@ -204,21 +204,9 @@ static const struct file_operations kvmppc_exit_timing_fops = { .release = single_release, }; -void kvmppc_create_vcpu_debugfs(struct kvm_vcpu *vcpu, unsigned int id) +void kvmppc_create_vcpu_debugfs(struct kvm_vcpu *vcpu, + struct dentry *debugfs_dentry) { - static char dbg_fname[50]; - struct dentry *debugfs_file; - - snprintf(dbg_fname, sizeof(dbg_fname), "vm%u_vcpu%u_timing", - current->pid, id); - debugfs_file = debugfs_create_file(dbg_fname, 0666, kvm_debugfs_dir, - vcpu, &kvmppc_exit_timing_fops); - - vcpu->arch.debugfs_exit_timing = debugfs_file; -} - -void kvmppc_remove_vcpu_debugfs(struct kvm_vcpu *vcpu) -{ - debugfs_remove(vcpu->arch.debugfs_exit_timing); - vcpu->arch.debugfs_exit_timing = NULL; + debugfs_create_file("timing", 0666, debugfs_dentry, + vcpu, &kvmppc_exit_timing_fops); } diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index b50dbe269f4b..85b2550e18e7 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -954,6 +954,9 @@ static int kvm_create_vm_debugfs(struct kvm *kvm, int fd) kvm->debugfs_dentry, stat_data, &stat_fops_per_vm); } +#ifdef __KVM_HAVE_ARCH_KVM_DEBUGFS + kvm_arch_create_vm_debugfs(kvm); +#endif return 0; }