From: Chao Peng <chao.p.peng@linux.intel.com> To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, qemu-devel@nongnu.org Cc: Paolo Bonzini <pbonzini@redhat.com>, Jonathan Corbet <corbet@lwn.net>, Sean Christopherson <seanjc@google.com>, Vitaly Kuznetsov <vkuznets@redhat.com>, Wanpeng Li <wanpengli@tencent.com>, Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, x86@kernel.org, "H . Peter Anvin" <hpa@zytor.com>, Hugh Dickins <hughd@google.com>, Jeff Layton <jlayton@kernel.org>, "J . Bruce Fields" <bfields@fieldses.org>, Andrew Morton <akpm@linux-foundation.org>, Yu Zhang <yu.c.zhang@linux.intel.com>, Chao Peng <chao.p.peng@linux.intel.com>, "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>, luto@kernel.org, john.ji@intel.com, susie.li@intel.com, jun.nakajima@intel.com, dave.hansen@intel.com, ak@linux.intel.com, david@redhat.com Subject: [RFC v2 PATCH 11/13] KVM: Add kvm_map_gfn_range Date: Fri, 19 Nov 2021 21:47:37 +0800 [thread overview] Message-ID: <20211119134739.20218-12-chao.p.peng@linux.intel.com> (raw) In-Reply-To: <20211119134739.20218-1-chao.p.peng@linux.intel.com> This may be used in the fallocate callback for memfd based memory to setup the mapping for KVM second MMU when the pages are allocated in the memory backing store. Signed-off-by: Yu Zhang <yu.c.zhang@linux.intel.com> Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com> --- arch/x86/kvm/mmu/mmu.c | 47 ++++++++++++++++++++++++++++++++++++++++ include/linux/kvm_host.h | 2 ++ virt/kvm/kvm_main.c | 5 +++++ 3 files changed, 54 insertions(+) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index cd5d1f923694..5c475a161a3c 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -1951,6 +1951,53 @@ static __always_inline bool kvm_handle_gfn_range(struct kvm *kvm, return ret; } +bool kvm_map_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range) +{ + struct kvm_vcpu *vcpu; + kvm_pfn_t pfn; + gfn_t gfn; + int idx; + bool ret = true; + + /* Need vcpu context for kvm_mmu_do_page_fault. */ + vcpu = kvm_get_vcpu(kvm, 0); + if (mutex_lock_killable(&vcpu->mutex)) + return false; + + vcpu_load(vcpu); + idx = srcu_read_lock(&kvm->srcu); + + kvm_mmu_reload(vcpu); + + gfn = range->start; + while (gfn < range->end) { + if (signal_pending(current)) { + ret = false; + break; + } + + if (need_resched()) + cond_resched(); + + pfn = kvm_mmu_do_page_fault(vcpu, gfn << PAGE_SHIFT, + PFERR_WRITE_MASK | PFERR_USER_MASK, + false); + if (is_error_noslot_pfn(pfn) || kvm->vm_bugged) { + ret = false; + break; + } + + gfn++; + } + + srcu_read_unlock(&kvm->srcu, idx); + vcpu_put(vcpu); + + mutex_unlock(&vcpu->mutex); + + return ret; +} + bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range) { bool flush = false; diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index f0fd32f6eab3..d841ed877b4b 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -237,6 +237,8 @@ struct kvm_gfn_range { pte_t pte; bool may_block; }; + +bool kvm_map_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range); bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range); bool kvm_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range); bool kvm_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range); diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 65055ac460eb..492c1a99ec63 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -471,6 +471,11 @@ static void kvm_mmu_notifier_invalidate_range(struct mmu_notifier *mn, srcu_read_unlock(&kvm->srcu, idx); } +bool __weak kvm_map_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range) +{ + return false; +} + typedef bool (*gfn_handler_t)(struct kvm *kvm, struct kvm_gfn_range *range); typedef void (*on_lock_fn_t)(struct kvm *kvm, unsigned long start, -- 2.17.1
WARNING: multiple messages have this Message-ID (diff)
From: Chao Peng <chao.p.peng@linux.intel.com> To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, qemu-devel@nongnu.org Cc: Wanpeng Li <wanpengli@tencent.com>, jun.nakajima@intel.com, david@redhat.com, "J . Bruce Fields" <bfields@fieldses.org>, dave.hansen@intel.com, "H . Peter Anvin" <hpa@zytor.com>, Chao Peng <chao.p.peng@linux.intel.com>, ak@linux.intel.com, Jonathan Corbet <corbet@lwn.net>, Joerg Roedel <joro@8bytes.org>, x86@kernel.org, Hugh Dickins <hughd@google.com>, Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, luto@kernel.org, Thomas Gleixner <tglx@linutronix.de>, Vitaly Kuznetsov <vkuznets@redhat.com>, Jim Mattson <jmattson@google.com>, Sean Christopherson <seanjc@google.com>, susie.li@intel.com, Jeff Layton <jlayton@kernel.org>, john.ji@intel.com, Yu Zhang <yu.c.zhang@linux.intel.com>, Paolo Bonzini <pbonzini@redhat.com>, Andrew Morton <akpm@linux-foundation.org>, "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com> Subject: [RFC v2 PATCH 11/13] KVM: Add kvm_map_gfn_range Date: Fri, 19 Nov 2021 21:47:37 +0800 [thread overview] Message-ID: <20211119134739.20218-12-chao.p.peng@linux.intel.com> (raw) In-Reply-To: <20211119134739.20218-1-chao.p.peng@linux.intel.com> This may be used in the fallocate callback for memfd based memory to setup the mapping for KVM second MMU when the pages are allocated in the memory backing store. Signed-off-by: Yu Zhang <yu.c.zhang@linux.intel.com> Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com> --- arch/x86/kvm/mmu/mmu.c | 47 ++++++++++++++++++++++++++++++++++++++++ include/linux/kvm_host.h | 2 ++ virt/kvm/kvm_main.c | 5 +++++ 3 files changed, 54 insertions(+) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index cd5d1f923694..5c475a161a3c 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -1951,6 +1951,53 @@ static __always_inline bool kvm_handle_gfn_range(struct kvm *kvm, return ret; } +bool kvm_map_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range) +{ + struct kvm_vcpu *vcpu; + kvm_pfn_t pfn; + gfn_t gfn; + int idx; + bool ret = true; + + /* Need vcpu context for kvm_mmu_do_page_fault. */ + vcpu = kvm_get_vcpu(kvm, 0); + if (mutex_lock_killable(&vcpu->mutex)) + return false; + + vcpu_load(vcpu); + idx = srcu_read_lock(&kvm->srcu); + + kvm_mmu_reload(vcpu); + + gfn = range->start; + while (gfn < range->end) { + if (signal_pending(current)) { + ret = false; + break; + } + + if (need_resched()) + cond_resched(); + + pfn = kvm_mmu_do_page_fault(vcpu, gfn << PAGE_SHIFT, + PFERR_WRITE_MASK | PFERR_USER_MASK, + false); + if (is_error_noslot_pfn(pfn) || kvm->vm_bugged) { + ret = false; + break; + } + + gfn++; + } + + srcu_read_unlock(&kvm->srcu, idx); + vcpu_put(vcpu); + + mutex_unlock(&vcpu->mutex); + + return ret; +} + bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range) { bool flush = false; diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index f0fd32f6eab3..d841ed877b4b 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -237,6 +237,8 @@ struct kvm_gfn_range { pte_t pte; bool may_block; }; + +bool kvm_map_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range); bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range); bool kvm_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range); bool kvm_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range); diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 65055ac460eb..492c1a99ec63 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -471,6 +471,11 @@ static void kvm_mmu_notifier_invalidate_range(struct mmu_notifier *mn, srcu_read_unlock(&kvm->srcu, idx); } +bool __weak kvm_map_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range) +{ + return false; +} + typedef bool (*gfn_handler_t)(struct kvm *kvm, struct kvm_gfn_range *range); typedef void (*on_lock_fn_t)(struct kvm *kvm, unsigned long start, -- 2.17.1
next prev parent reply other threads:[~2021-11-19 13:50 UTC|newest] Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-11-19 13:47 [RFC v2 PATCH 00/13] KVM: mm: fd-based approach for supporting KVM guest private memory Chao Peng 2021-11-19 13:47 ` Chao Peng 2021-11-19 13:47 ` [RFC v2 PATCH 01/13] mm/shmem: Introduce F_SEAL_GUEST Chao Peng 2021-11-19 13:47 ` Chao Peng 2021-11-19 13:51 ` David Hildenbrand 2021-11-19 13:51 ` David Hildenbrand 2021-11-22 13:59 ` Kirill A. Shutemov 2021-11-22 13:59 ` Kirill A. Shutemov 2021-11-19 15:19 ` Jason Gunthorpe 2021-11-19 15:19 ` Jason Gunthorpe 2021-11-19 15:39 ` David Hildenbrand 2021-11-19 15:39 ` David Hildenbrand 2021-11-19 16:00 ` Jason Gunthorpe 2021-11-19 16:00 ` Jason Gunthorpe 2021-11-22 9:26 ` David Hildenbrand 2021-11-22 9:26 ` David Hildenbrand 2021-11-22 13:31 ` Jason Gunthorpe 2021-11-22 13:31 ` Jason Gunthorpe 2021-11-22 13:35 ` David Hildenbrand 2021-11-22 13:35 ` David Hildenbrand 2021-11-22 14:01 ` Jason Gunthorpe 2021-11-22 14:01 ` Jason Gunthorpe 2021-11-22 14:57 ` David Hildenbrand 2021-11-22 14:57 ` David Hildenbrand 2021-11-22 15:09 ` Jason Gunthorpe 2021-11-22 15:09 ` Jason Gunthorpe 2021-11-22 15:15 ` David Hildenbrand 2021-11-22 15:15 ` David Hildenbrand 2021-11-19 19:18 ` Sean Christopherson 2021-11-19 19:47 ` Jason Gunthorpe 2021-11-19 19:47 ` Jason Gunthorpe 2021-11-19 22:21 ` Sean Christopherson 2021-11-19 23:33 ` Jason Gunthorpe 2021-11-19 23:33 ` Jason Gunthorpe 2021-11-20 1:23 ` Sean Christopherson 2021-11-21 0:05 ` Jason Gunthorpe 2021-11-21 0:05 ` Jason Gunthorpe 2021-11-23 9:06 ` Paolo Bonzini 2021-11-23 9:06 ` Paolo Bonzini 2021-11-23 14:33 ` Chao Peng 2021-11-23 14:33 ` Chao Peng 2021-11-23 15:20 ` David Hildenbrand 2021-11-23 15:20 ` David Hildenbrand 2021-11-23 17:17 ` Jason Gunthorpe 2021-11-23 17:17 ` Jason Gunthorpe 2021-11-23 8:54 ` Paolo Bonzini 2021-11-23 8:54 ` Paolo Bonzini 2021-12-03 1:11 ` Andy Lutomirski 2021-12-03 1:11 ` Andy Lutomirski 2021-11-19 13:47 ` [RFC v2 PATCH 02/13] KVM: Add KVM_EXIT_MEMORY_ERROR exit Chao Peng 2021-11-19 13:47 ` Chao Peng 2021-11-19 13:47 ` [RFC v2 PATCH 03/13] KVM: Extend kvm_userspace_memory_region to support fd based memslot Chao Peng 2021-11-19 13:47 ` Chao Peng 2021-11-19 13:47 ` [RFC v2 PATCH 04/13] KVM: Add fd-based memslot data structure and utils Chao Peng 2021-11-19 13:47 ` Chao Peng 2021-11-23 8:41 ` Paolo Bonzini 2021-11-23 8:41 ` Paolo Bonzini 2021-11-23 14:30 ` Chao Peng 2021-11-23 14:30 ` Chao Peng 2021-11-19 13:47 ` [RFC v2 PATCH 05/13] KVM: Implement fd-based memory using new memfd interfaces Chao Peng 2021-11-19 13:47 ` Chao Peng 2021-11-19 13:47 ` [RFC v2 PATCH 06/13] KVM: Register/unregister memfd backed memslot Chao Peng 2021-11-19 13:47 ` Chao Peng 2021-11-25 16:55 ` Steven Price 2021-11-25 16:55 ` Steven Price 2021-11-19 13:47 ` [RFC v2 PATCH 07/13] KVM: Handle page fault for fd based memslot Chao Peng 2021-11-19 13:47 ` Chao Peng 2021-11-20 1:55 ` Yao Yuan 2021-11-20 1:55 ` Yao Yuan 2021-11-22 9:18 ` Chao Peng 2021-11-22 9:18 ` Chao Peng 2021-11-19 13:47 ` [RFC v2 PATCH 08/13] KVM: Rename hva memory invalidation code to cover fd-based offset Chao Peng 2021-11-19 13:47 ` Chao Peng 2021-11-19 13:47 ` [RFC v2 PATCH 09/13] KVM: Introduce kvm_memfd_invalidate_range Chao Peng 2021-11-19 13:47 ` Chao Peng 2021-11-23 8:46 ` Paolo Bonzini 2021-11-23 8:46 ` Paolo Bonzini 2021-11-23 14:24 ` Chao Peng 2021-11-23 14:24 ` Chao Peng 2021-11-19 13:47 ` [RFC v2 PATCH 10/13] KVM: Match inode for invalidation of fd-based slot Chao Peng 2021-11-19 13:47 ` Chao Peng 2021-11-19 13:47 ` Chao Peng [this message] 2021-11-19 13:47 ` [RFC v2 PATCH 11/13] KVM: Add kvm_map_gfn_range Chao Peng 2021-11-19 13:47 ` [RFC v2 PATCH 12/13] KVM: Introduce kvm_memfd_fallocate_range Chao Peng 2021-11-19 13:47 ` Chao Peng 2021-11-19 13:47 ` [RFC v2 PATCH 13/13] KVM: Enable memfd based page invalidation/fallocate Chao Peng 2021-11-19 13:47 ` Chao Peng 2021-11-22 14:16 ` Kirill A. Shutemov 2021-11-22 14:16 ` Kirill A. Shutemov 2021-11-23 1:06 ` Chao Peng 2021-11-23 1:06 ` Chao Peng 2021-11-23 9:09 ` Paolo Bonzini 2021-11-23 9:09 ` Paolo Bonzini 2021-11-23 15:00 ` Chao Peng 2021-11-23 15:00 ` Chao Peng 2021-11-23 8:51 ` Paolo Bonzini 2021-11-23 8:51 ` Paolo Bonzini 2021-12-03 1:08 ` [RFC v2 PATCH 00/13] KVM: mm: fd-based approach for supporting KVM guest private memory Andy Lutomirski 2021-12-03 1:08 ` Andy Lutomirski
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