[v6,13/22] KVM: Simplify kvm_free_memslot() and all its descendents

Message ID	20200218210736.16432-14-sean.j.christopherson@intel.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <SRS0=rjrT=4G=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 5D2B82176D From: Sean Christopherson <sean.j.christopherson@intel.com> To: Paolo Bonzini <pbonzini@redhat.com> Subject: [PATCH v6 13/22] KVM: Simplify kvm_free_memslot() and all its descendents Date: Tue, 18 Feb 2020 13:07:27 -0800 Message-Id: <20200218210736.16432-14-sean.j.christopherson@intel.com> In-Reply-To: <20200218210736.16432-1-sean.j.christopherson@intel.com> References: <20200218210736.16432-1-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 [134.134.136.31 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: Wanpeng Li <wanpengli@tencent.com>, kvm@vger.kernel.org, David Hildenbrand <david@redhat.com>, Peter Xu <peterx@redhat.com>, linux-mips@vger.kernel.org, Paul Mackerras <paulus@ozlabs.org>, kvmarm@lists.cs.columbia.edu, Janosch Frank <frankja@linux.ibm.com>, Marc Zyngier <maz@kernel.org>, Joerg Roedel <joro@8bytes.org>, Christian Borntraeger <borntraeger@de.ibm.com>, Julien Thierry <julien.thierry.kdev@gmail.com>, Suzuki K Poulose <suzuki.poulose@arm.com>, kvm-ppc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Jim Mattson <jmattson@google.com>, Cornelia Huck <cohuck@redhat.com>, Christoffer Dall <christoffer.dall@arm.com>, Sean Christopherson <sean.j.christopherson@intel.com>, linux-kernel@vger.kernel.org, James Morse <james.morse@arm.com>, Vitaly Kuznetsov <vkuznets@redhat.com>, =?utf-8?q?Philippe_Mathieu-Daud?= =?utf-8?q?=C3=A9?= <f4bug@amsat.org> 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 [v6,00/22] KVM: Dynamically size memslot arrays [v6,01/22] KVM: x86: Allocate new rmap and large page tracking when moving memslot [v6,02/22] KVM: Reinstall old memslots if arch preparation fails [v6,03/22] KVM: Don't free new memslot if allocation of said memslot fails [v6,04/22] KVM: PPC: Move memslot memory allocation into prepare_memory_region() [v6,05/22] KVM: x86: Allocate memslot resources during prepare_memory_region() [v6,06/22] KVM: Drop kvm_arch_create_memslot() [v6,07/22] KVM: Explicitly free allocated-but-unused dirty bitmap [v6,08/22] KVM: Refactor error handling for setting memory region [v6,09/22] KVM: Move setting of memslot into helper routine [v6,10/22] KVM: Drop "const" attribute from old memslot in commit_memory_region() [v6,11/22] KVM: x86: Free arrays for old memslot when moving memslot's base gfn [v6,12/22] KVM: Move memslot deletion to helper function [v6,13/22] KVM: Simplify kvm_free_memslot() and all its descendents [v6,14/22] KVM: Clean up local variable usage in __kvm_set_memory_region() [v6,15/22] KVM: Provide common implementation for generic dirty log functions [v6,16/22] KVM: Ensure validity of memslot with respect to kvm_get_dirty_log() [v6,17/22] KVM: Terminate memslot walks via used_slots [v6,18/22] KVM: Dynamically size memslot array based on number of used slots [v6,19/22] KVM: selftests: Add test for KVM_SET_USER_MEMORY_REGION [v6,20/22] KVM: x86/mmu: Move kvm_arch_flush_remote_tlbs_memslot() to mmu.c [v6,21/22] KVM: x86/mmu: Use ranged-based TLB flush for dirty log memslot flush [v6,22/22] KVM: x86/mmu: Consolidate open coded variants of memslot TLB flushes

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 d162649430ba..406ec46304d5 100644 --- a/arch/powerpc/include/asm/kvm_ppc.h +++ b/arch/powerpc/include/asm/kvm_ppc.h @@ -200,8 +200,7 @@ 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, @@ -291,8 +290,7 @@ 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 e9149a815806..97ce6c4f7b48 100644 --- a/arch/powerpc/kvm/book3s.c +++ b/arch/powerpc/kvm/book3s.c @@ -804,10 +804,9 @@ 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 460f31f94337..a7353a5a0045 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -4447,13 +4447,10 @@ 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 3077a0cd0e5e..71ae332b91c9 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -1942,8 +1942,7 @@ 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 44f50fc50976..b0519069892b 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -1771,8 +1771,7 @@ 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 768c4a9269be..838cdcd2db12 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -685,10 +685,9 @@ 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 1726224e7772..1060508f1a53 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -921,7 +921,7 @@ static inline void kvm_arch_hardware_disable(void) {} static inline void kvm_arch_sync_events(struct kvm *kvm) {} 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/mmu/page_track.c b/arch/x86/kvm/mmu/page_track.c index 3521e2d176f2..d125ec379c79 100644 --- a/arch/x86/kvm/mmu/page_track.c +++ b/arch/x86/kvm/mmu/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 b8ee55800c9d..419e07246d0d 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -9829,27 +9829,22 @@ 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_alloc_memslot_metadata(struct kvm_memory_slot *slot, @@ -10048,7 +10043,7 @@ void kvm_arch_commit_memory_region(struct kvm *kvm, /* Free the arrays associated with the old memslot. */ if (change == KVM_MR_MOVE) - kvm_arch_free_memslot(kvm, old, NULL); + kvm_arch_free_memslot(kvm, old); } void kvm_arch_flush_shadow_all(struct kvm *kvm) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 1807feef26a3..92ef33ee6431 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -669,8 +669,7 @@ 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 97b87037aff3..8f22efa095f4 100644 --- a/virt/kvm/arm/mmu.c +++ b/virt/kvm/arm/mmu.c @@ -2349,8 +2349,7 @@ 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 1f56a0d042a0..1ef5e04f7b93 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -580,18 +580,14 @@ 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) @@ -602,7 +598,7 @@ 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); } @@ -1060,7 +1056,7 @@ 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; }

[v6,13/22] KVM: Simplify kvm_free_memslot() and all its descendents

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