[v2,10/15] KVM: Simplify kvm_free_memslot() and all its descendents

Message ID	20191022003537.13013-11-sean.j.christopherson@intel.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <SRS0=/a1V=YP=lists.infradead.org=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@kernel.org> DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CDD6F2089E From: Sean Christopherson <sean.j.christopherson@intel.com> To: James Hogan <jhogan@kernel.org>, Paul Mackerras <paulus@ozlabs.org>, Christian Borntraeger <borntraeger@de.ibm.com>, Janosch Frank <frankja@linux.ibm.com>, Paolo Bonzini <pbonzini@redhat.com>, =?utf-8?b?UmFkaW0gS3LEjW3DocWZ?= <rkrcmar@redhat.com>, Marc Zyngier <maz@kernel.org> Subject: [PATCH v2 10/15] KVM: Simplify kvm_free_memslot() and all its descendents Date: Mon, 21 Oct 2019 17:35:32 -0700 Message-Id: <20191022003537.13013-11-sean.j.christopherson@intel.com> In-Reply-To: <20191022003537.13013-1-sean.j.christopherson@intel.com> References: <20191022003537.13013-1-sean.j.christopherson@intel.com> MIME-Version: 1.0 summary: Content analysis details: (-2.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [192.55.52.43 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record Precedence: list Cc: linux-arm-kernel@lists.infradead.org, Wanpeng Li <wanpengli@tencent.com>, kvm@vger.kernel.org, David Hildenbrand <david@redhat.com>, Joerg Roedel <joro@8bytes.org>, Cornelia Huck <cohuck@redhat.com>, linux-mips@vger.kernel.org, Sean Christopherson <sean.j.christopherson@intel.com>, linux-kernel@vger.kernel.org, James Morse <james.morse@arm.com>, kvm-ppc@vger.kernel.org, Vitaly Kuznetsov <vkuznets@redhat.com>, Suzuki K Poulose <suzuki.poulose@arm.com>, kvmarm@lists.cs.columbia.edu, Julien Thierry <julien.thierry.kdev@gmail.com>, Jim Mattson <jmattson@google.com> Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" <linux-arm-kernel-bounces@lists.infradead.org> Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org
Series	KVM: Dynamically size memslot arrays \| expand [v2,00/15] KVM: Dynamically size memslot arrays [v2,01/15] KVM: Reinstall old memslots if arch preparation fails [v2,02/15] KVM: Don't free new memslot if allocation of said memslot fails [v2,03/15] KVM: PPC: Move memslot memory allocation into prepare_memory_region() [v2,04/15] KVM: x86: Allocate memslot resources during prepare_memory_region() [v2,05/15] KVM: Drop kvm_arch_create_memslot() [v2,06/15] KVM: Explicitly free allocated-but-unused dirty bitmap [v2,07/15] KVM: Refactor error handling for setting memory region [v2,08/15] KVM: Move setting of memslot into helper routine [v2,09/15] KVM: Move memslot deletion to helper function [v2,10/15] KVM: Simplify kvm_free_memslot() and all its descendents [v2,11/15] KVM: Clean up local variable usage in __kvm_set_memory_region() [v2,12/15] KVM: Provide common implementation for generic dirty log functions [v2,13/15] KVM: Ensure validity of memslot with respect to kvm_get_dirty_log() [v2,14/15] KVM: Terminate memslot walks via used_slots [v2,15/15] KVM: Dynamically size memslot array based on number of used slots

diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h index 41204a49cf95..2c343c346b79 100644 --- a/arch/mips/include/asm/kvm_host.h +++ b/arch/mips/include/asm/kvm_host.h @@ -1133,7 +1133,7 @@ extern unsigned long kvm_mips_get_ramsize(struct kvm *kvm); static inline void kvm_arch_hardware_unsetup(void) {} static inline void kvm_arch_sync_events(struct kvm *kvm) {} static inline void kvm_arch_free_memslot(struct kvm *kvm, - struct kvm_memory_slot *free, struct kvm_memory_slot *dont) {} + struct kvm_memory_slot *slot) {} static inline void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen) {} static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {} static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) {} diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h index 495901ae0070..bca17ffeff20 100644 --- a/arch/powerpc/include/asm/kvm_ppc.h +++ b/arch/powerpc/include/asm/kvm_ppc.h @@ -201,8 +201,7 @@ extern void kvm_free_hpt_cma(struct page *page, unsigned long nr_pages); extern int kvmppc_core_init_vm(struct kvm *kvm); extern void kvmppc_core_destroy_vm(struct kvm *kvm); extern void kvmppc_core_free_memslot(struct kvm *kvm, - struct kvm_memory_slot *free, - struct kvm_memory_slot *dont); + struct kvm_memory_slot *slot); extern int kvmppc_core_prepare_memory_region(struct kvm *kvm, struct kvm_memory_slot *memslot, const struct kvm_userspace_memory_region *mem); @@ -290,8 +289,7 @@ struct kvmppc_ops { int (*test_age_hva)(struct kvm *kvm, unsigned long hva); void (*set_spte_hva)(struct kvm *kvm, unsigned long hva, pte_t pte); void (*mmu_destroy)(struct kvm_vcpu *vcpu); - void (*free_memslot)(struct kvm_memory_slot *free, - struct kvm_memory_slot *dont); + void (*free_memslot)(struct kvm_memory_slot *slot); int (*init_vm)(struct kvm *kvm); void (*destroy_vm)(struct kvm *kvm); int (*get_smmu_info)(struct kvm *kvm, struct kvm_ppc_smmu_info *info); diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c index 111b39a5250d..a5d4a1014fdf 100644 --- a/arch/powerpc/kvm/book3s.c +++ b/arch/powerpc/kvm/book3s.c @@ -834,10 +834,9 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) return kvm->arch.kvm_ops->get_dirty_log(kvm, log); } -void kvmppc_core_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, - struct kvm_memory_slot *dont) +void kvmppc_core_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot) { - kvm->arch.kvm_ops->free_memslot(free, dont); + kvm->arch.kvm_ops->free_memslot(slot); } void kvmppc_core_flush_memslot(struct kvm *kvm, struct kvm_memory_slot *memslot) diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 4e5664379329..14906f7c12c5 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -4452,13 +4452,10 @@ static int kvm_vm_ioctl_get_dirty_log_hv(struct kvm *kvm, return r; } -static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *free, - struct kvm_memory_slot *dont) +static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *slot) { - if (!dont || free->arch.rmap != dont->arch.rmap) { - vfree(free->arch.rmap); - free->arch.rmap = NULL; - } + vfree(slot->arch.rmap); + slot->arch.rmap = NULL; } static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm, diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c index 5fceb1da5fde..5368a5dbac22 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -1918,8 +1918,7 @@ static void kvmppc_core_commit_memory_region_pr(struct kvm *kvm, return; } -static void kvmppc_core_free_memslot_pr(struct kvm_memory_slot *free, - struct kvm_memory_slot *dont) +static void kvmppc_core_free_memslot_pr(struct kvm_memory_slot *slot) { return; } diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index cf2845e147c5..a22ff567724a 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -1801,8 +1801,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) return -ENOTSUPP; } -void kvmppc_core_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, - struct kvm_memory_slot *dont) +void kvmppc_core_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot) { } diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index bb427543f8a3..622f77d73c24 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -681,10 +681,9 @@ long kvm_arch_dev_ioctl(struct file *filp, return -EINVAL; } -void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, - struct kvm_memory_slot *dont) +void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot) { - kvmppc_core_free_memslot(kvm, free, dont); + kvmppc_core_free_memslot(kvm, slot); } int kvm_arch_prepare_memory_region(struct kvm *kvm, diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h index abe60268335d..43301e8a5cbd 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -916,7 +916,7 @@ static inline void kvm_arch_sync_events(struct kvm *kvm) {} static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {} static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {} static inline void kvm_arch_free_memslot(struct kvm *kvm, - struct kvm_memory_slot *free, struct kvm_memory_slot *dont) {} + struct kvm_memory_slot *slot) {} static inline void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen) {} static inline void kvm_arch_flush_shadow_all(struct kvm *kvm) {} static inline void kvm_arch_flush_shadow_memslot(struct kvm *kvm, diff --git a/arch/x86/include/asm/kvm_page_track.h b/arch/x86/include/asm/kvm_page_track.h index 172f9749dbb2..87bd6025d91d 100644 --- a/arch/x86/include/asm/kvm_page_track.h +++ b/arch/x86/include/asm/kvm_page_track.h @@ -49,8 +49,7 @@ struct kvm_page_track_notifier_node { void kvm_page_track_init(struct kvm *kvm); void kvm_page_track_cleanup(struct kvm *kvm); -void kvm_page_track_free_memslot(struct kvm_memory_slot *free, - struct kvm_memory_slot *dont); +void kvm_page_track_free_memslot(struct kvm_memory_slot *slot); int kvm_page_track_create_memslot(struct kvm_memory_slot *slot, unsigned long npages); diff --git a/arch/x86/kvm/page_track.c b/arch/x86/kvm/page_track.c index 3521e2d176f2..d125ec379c79 100644 --- a/arch/x86/kvm/page_track.c +++ b/arch/x86/kvm/page_track.c @@ -19,17 +19,14 @@ #include "mmu.h" -void kvm_page_track_free_memslot(struct kvm_memory_slot *free, - struct kvm_memory_slot *dont) +void kvm_page_track_free_memslot(struct kvm_memory_slot *slot) { int i; - for (i = 0; i < KVM_PAGE_TRACK_MAX; i++) - if (!dont || free->arch.gfn_track[i] != - dont->arch.gfn_track[i]) { - kvfree(free->arch.gfn_track[i]); - free->arch.gfn_track[i] = NULL; - } + for (i = 0; i < KVM_PAGE_TRACK_MAX; i++) { + kvfree(slot->arch.gfn_track[i]); + slot->arch.gfn_track[i] = NULL; + } } int kvm_page_track_create_memslot(struct kvm_memory_slot *slot, @@ -48,7 +45,7 @@ int kvm_page_track_create_memslot(struct kvm_memory_slot *slot, return 0; track_free: - kvm_page_track_free_memslot(slot, NULL); + kvm_page_track_free_memslot(slot); return -ENOMEM; } diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index eb812bb18599..adf384ef5969 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -9576,27 +9576,22 @@ void kvm_arch_destroy_vm(struct kvm *kvm) kvm_hv_destroy_vm(kvm); } -void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, - struct kvm_memory_slot *dont) +void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot) { int i; for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) { - if (!dont || free->arch.rmap[i] != dont->arch.rmap[i]) { - kvfree(free->arch.rmap[i]); - free->arch.rmap[i] = NULL; - } + kvfree(slot->arch.rmap[i]); + slot->arch.rmap[i] = NULL; + if (i == 0) continue; - if (!dont || free->arch.lpage_info[i - 1] != - dont->arch.lpage_info[i - 1]) { - kvfree(free->arch.lpage_info[i - 1]); - free->arch.lpage_info[i - 1] = NULL; - } + kvfree(slot->arch.lpage_info[i - 1]); + slot->arch.lpage_info[i - 1] = NULL; } - kvm_page_track_free_memslot(free, dont); + kvm_page_track_free_memslot(slot); } static int kvm_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot, diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 23a2373931cb..bfb8194d0366 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -677,8 +677,7 @@ int kvm_set_memory_region(struct kvm *kvm, const struct kvm_userspace_memory_region *mem); int __kvm_set_memory_region(struct kvm *kvm, const struct kvm_userspace_memory_region *mem); -void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, - struct kvm_memory_slot *dont); +void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot); void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen); int kvm_arch_prepare_memory_region(struct kvm *kvm, struct kvm_memory_slot *memslot, diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c index f264de85f648..f3241b268d49 100644 --- a/virt/kvm/arm/mmu.c +++ b/virt/kvm/arm/mmu.c @@ -2353,8 +2353,7 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm, return ret; } -void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, - struct kvm_memory_slot *dont) +void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot) { } diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 38bb446cef85..5f0d68c6e2dc 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -549,18 +549,14 @@ static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) memslot->dirty_bitmap = NULL; } -/* - * Free any memory in @free but not in @dont. - */ -static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, - struct kvm_memory_slot *dont) +static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot) { - if (!dont || free->dirty_bitmap != dont->dirty_bitmap) - kvm_destroy_dirty_bitmap(free); + kvm_destroy_dirty_bitmap(slot); - kvm_arch_free_memslot(kvm, free, dont); + kvm_arch_free_memslot(kvm, slot); - free->npages = 0; + slot->flags = 0; + slot->npages = 0; } static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots) @@ -571,7 +567,7 @@ static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots) return; kvm_for_each_memslot(memslot, slots) - kvm_free_memslot(kvm, memslot, NULL); + kvm_free_memslot(kvm, memslot); kvfree(slots); } @@ -985,7 +981,7 @@ static int kvm_delete_memslot(struct kvm *kvm, if (r) return r; - kvm_free_memslot(kvm, old, NULL); + kvm_free_memslot(kvm, old); return 0; }

[v2,10/15] KVM: Simplify kvm_free_memslot() and all its descendents

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Patch