[RFC,v2,03/13] KVM: Extend kvm_userspace_memory_region to support fd based memslot

Message ID	20211119134739.20218-4-chao.p.peng@linux.intel.com (mailing list archive)
State	New
Headers	show Return-Path: <SRS0=ywda=QG=kvack.org=owner-linux-mm@kernel.org> DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org ACB0E61401 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 03/13] KVM: Extend kvm_userspace_memory_region to support fd based memslot Date: Fri, 19 Nov 2021 21:47:29 +0800 Message-Id: <20211119134739.20218-4-chao.p.peng@linux.intel.com> In-Reply-To: <20211119134739.20218-1-chao.p.peng@linux.intel.com> References: <20211119134739.20218-1-chao.p.peng@linux.intel.com> Sender: owner-linux-mm@kvack.org Precedence: bulk
Series	KVM: mm: fd-based approach for supporting KVM guest private memory \| expand [RFC,v2,00/13] KVM: mm: fd-based approach for supporting KVM guest private memory [RFC,v2,01/13] mm/shmem: Introduce F_SEAL_GUEST [RFC,v2,02/13] KVM: Add KVM_EXIT_MEMORY_ERROR exit [RFC,v2,03/13] KVM: Extend kvm_userspace_memory_region to support fd based memslot [RFC,v2,04/13] KVM: Add fd-based memslot data structure and utils [RFC,v2,05/13] KVM: Implement fd-based memory using new memfd interfaces [RFC,v2,06/13] KVM: Register/unregister memfd backed memslot [RFC,v2,07/13] KVM: Handle page fault for fd based memslot [RFC,v2,08/13] KVM: Rename hva memory invalidation code to cover fd-based offset [RFC,v2,09/13] KVM: Introduce kvm_memfd_invalidate_range [RFC,v2,10/13] KVM: Match inode for invalidation of fd-based slot [RFC,v2,11/13] KVM: Add kvm_map_gfn_range [RFC,v2,12/13] KVM: Introduce kvm_memfd_fallocate_range [RFC,v2,13/13] KVM: Enable memfd based page invalidation/fallocate

diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index 326cdfec74a1..395e52314834 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -1463,10 +1463,10 @@ int kvm_mmu_init(u32 *hyp_va_bits) } void kvm_arch_commit_memory_region(struct kvm *kvm, - const struct kvm_userspace_memory_region *mem, - struct kvm_memory_slot *old, - const struct kvm_memory_slot *new, - enum kvm_mr_change change) + const struct kvm_userspace_memory_region_ext *mem, + struct kvm_memory_slot *old, + const struct kvm_memory_slot *new, + enum kvm_mr_change change) { /* * At this point memslot has been committed and there is an @@ -1486,9 +1486,9 @@ void kvm_arch_commit_memory_region(struct kvm *kvm, } int kvm_arch_prepare_memory_region(struct kvm *kvm, - struct kvm_memory_slot *memslot, - const struct kvm_userspace_memory_region *mem, - enum kvm_mr_change change) + struct kvm_memory_slot *memslot, + const struct kvm_userspace_memory_region_ext *mem, + enum kvm_mr_change change) { hva_t hva = mem->userspace_addr; hva_t reg_end = hva + mem->memory_size; diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c index 562aa878b266..ef71146809d5 100644 --- a/arch/mips/kvm/mips.c +++ b/arch/mips/kvm/mips.c @@ -233,18 +233,18 @@ void kvm_arch_flush_shadow_memslot(struct kvm *kvm, } int kvm_arch_prepare_memory_region(struct kvm *kvm, - struct kvm_memory_slot *memslot, - const struct kvm_userspace_memory_region *mem, - enum kvm_mr_change change) + struct kvm_memory_slot *memslot, + const struct kvm_userspace_memory_region_ext *mem, + enum kvm_mr_change change) { return 0; } void kvm_arch_commit_memory_region(struct kvm *kvm, - const struct kvm_userspace_memory_region *mem, - struct kvm_memory_slot *old, - const struct kvm_memory_slot *new, - enum kvm_mr_change change) + const struct kvm_userspace_memory_region_ext *mem, + struct kvm_memory_slot *old, + const struct kvm_memory_slot *new, + enum kvm_mr_change change) { int needs_flush; diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h index 671fbd1a765e..7cdc756a94a0 100644 --- a/arch/powerpc/include/asm/kvm_ppc.h +++ b/arch/powerpc/include/asm/kvm_ppc.h @@ -200,14 +200,14 @@ extern void kvmppc_core_destroy_vm(struct kvm *kvm); extern void kvmppc_core_free_memslot(struct kvm *kvm, 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, - enum kvm_mr_change change); + struct kvm_memory_slot *memslot, + const struct kvm_userspace_memory_region_ext *mem, + enum kvm_mr_change change); extern void kvmppc_core_commit_memory_region(struct kvm *kvm, - const struct kvm_userspace_memory_region *mem, - const struct kvm_memory_slot *old, - const struct kvm_memory_slot *new, - enum kvm_mr_change change); + const struct kvm_userspace_memory_region_ext *mem, + const struct kvm_memory_slot *old, + const struct kvm_memory_slot *new, + enum kvm_mr_change change); extern int kvm_vm_ioctl_get_smmu_info(struct kvm *kvm, struct kvm_ppc_smmu_info *info); extern void kvmppc_core_flush_memslot(struct kvm *kvm, @@ -274,14 +274,14 @@ struct kvmppc_ops { int (*get_dirty_log)(struct kvm *kvm, struct kvm_dirty_log *log); void (*flush_memslot)(struct kvm *kvm, struct kvm_memory_slot *memslot); int (*prepare_memory_region)(struct kvm *kvm, - struct kvm_memory_slot *memslot, - const struct kvm_userspace_memory_region *mem, - enum kvm_mr_change change); + struct kvm_memory_slot *memslot, + const struct kvm_userspace_memory_region_ext *mem, + enum kvm_mr_change change); void (*commit_memory_region)(struct kvm *kvm, - const struct kvm_userspace_memory_region *mem, - const struct kvm_memory_slot *old, - const struct kvm_memory_slot *new, - enum kvm_mr_change change); + const struct kvm_userspace_memory_region_ext *mem, + const struct kvm_memory_slot *old, + const struct kvm_memory_slot *new, + enum kvm_mr_change change); bool (*unmap_gfn_range)(struct kvm *kvm, struct kvm_gfn_range *range); bool (*age_gfn)(struct kvm *kvm, struct kvm_gfn_range *range); bool (*test_age_gfn)(struct kvm *kvm, struct kvm_gfn_range *range); diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c index b785f6772391..6b4bf08e7c8b 100644 --- a/arch/powerpc/kvm/book3s.c +++ b/arch/powerpc/kvm/book3s.c @@ -847,19 +847,19 @@ void kvmppc_core_flush_memslot(struct kvm *kvm, struct kvm_memory_slot *memslot) } int kvmppc_core_prepare_memory_region(struct kvm *kvm, - struct kvm_memory_slot *memslot, - const struct kvm_userspace_memory_region *mem, - enum kvm_mr_change change) + struct kvm_memory_slot *memslot, + const struct kvm_userspace_memory_region_ext *mem, + enum kvm_mr_change change) { return kvm->arch.kvm_ops->prepare_memory_region(kvm, memslot, mem, change); } void kvmppc_core_commit_memory_region(struct kvm *kvm, - const struct kvm_userspace_memory_region *mem, - const struct kvm_memory_slot *old, - const struct kvm_memory_slot *new, - enum kvm_mr_change change) + const struct kvm_userspace_memory_region_ext *mem, + const struct kvm_memory_slot *old, + const struct kvm_memory_slot *new, + enum kvm_mr_change change) { kvm->arch.kvm_ops->commit_memory_region(kvm, mem, old, new, change); } diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 7b74fc0a986b..3b7be7894c48 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -4854,9 +4854,9 @@ static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *slot) } static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm, - struct kvm_memory_slot *slot, - const struct kvm_userspace_memory_region *mem, - enum kvm_mr_change change) + struct kvm_memory_slot *slot, + const struct kvm_userspace_memory_region_ext *mem, + enum kvm_mr_change change) { unsigned long npages = mem->memory_size >> PAGE_SHIFT; @@ -4871,10 +4871,10 @@ static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm, } static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm, - const struct kvm_userspace_memory_region *mem, - const struct kvm_memory_slot *old, - const struct kvm_memory_slot *new, - enum kvm_mr_change change) + const struct kvm_userspace_memory_region_ext *mem, + const struct kvm_memory_slot *old, + const struct kvm_memory_slot *new, + enum kvm_mr_change change) { unsigned long npages = mem->memory_size >> PAGE_SHIFT; diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c index 6bc9425acb32..4dd06b24c1b6 100644 --- a/arch/powerpc/kvm/book3s_pr.c +++ b/arch/powerpc/kvm/book3s_pr.c @@ -1899,18 +1899,18 @@ static void kvmppc_core_flush_memslot_pr(struct kvm *kvm, } static int kvmppc_core_prepare_memory_region_pr(struct kvm *kvm, - struct kvm_memory_slot *memslot, - const struct kvm_userspace_memory_region *mem, - enum kvm_mr_change change) + struct kvm_memory_slot *memslot, + const struct kvm_userspace_memory_region_ext *mem, + enum kvm_mr_change change) { return 0; } static void kvmppc_core_commit_memory_region_pr(struct kvm *kvm, - const struct kvm_userspace_memory_region *mem, - const struct kvm_memory_slot *old, - const struct kvm_memory_slot *new, - enum kvm_mr_change change) + const struct kvm_userspace_memory_region_ext *mem, + const struct kvm_memory_slot *old, + const struct kvm_memory_slot *new, + enum kvm_mr_change change) { return; } diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c index 8c15c90dd3a9..f2d1acd782bf 100644 --- a/arch/powerpc/kvm/booke.c +++ b/arch/powerpc/kvm/booke.c @@ -1821,18 +1821,18 @@ void kvmppc_core_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot) } int kvmppc_core_prepare_memory_region(struct kvm *kvm, - struct kvm_memory_slot *memslot, - const struct kvm_userspace_memory_region *mem, - enum kvm_mr_change change) + struct kvm_memory_slot *memslot, + const struct kvm_userspace_memory_region_ext *mem, + enum kvm_mr_change change) { return 0; } void kvmppc_core_commit_memory_region(struct kvm *kvm, - const struct kvm_userspace_memory_region *mem, - const struct kvm_memory_slot *old, - const struct kvm_memory_slot *new, - enum kvm_mr_change change) + const struct kvm_userspace_memory_region_ext *mem, + const struct kvm_memory_slot *old, + const struct kvm_memory_slot *new, + enum kvm_mr_change change) { } diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 35e9cccdeef9..4aa5ef921710 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -706,18 +706,18 @@ void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot) } int kvm_arch_prepare_memory_region(struct kvm *kvm, - struct kvm_memory_slot *memslot, - const struct kvm_userspace_memory_region *mem, - enum kvm_mr_change change) + struct kvm_memory_slot *memslot, + const struct kvm_userspace_memory_region_ext *mem, + enum kvm_mr_change change) { return kvmppc_core_prepare_memory_region(kvm, memslot, mem, change); } void kvm_arch_commit_memory_region(struct kvm *kvm, - const struct kvm_userspace_memory_region *mem, - struct kvm_memory_slot *old, - const struct kvm_memory_slot *new, - enum kvm_mr_change change) + const struct kvm_userspace_memory_region_ext *mem, + struct kvm_memory_slot *old, + const struct kvm_memory_slot *new, + enum kvm_mr_change change) { kvmppc_core_commit_memory_region(kvm, mem, old, new, change); } diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c index d81bae8eb55e..a7f25b0da391 100644 --- a/arch/riscv/kvm/mmu.c +++ b/arch/riscv/kvm/mmu.c @@ -456,10 +456,10 @@ void kvm_arch_flush_shadow_memslot(struct kvm *kvm, } void kvm_arch_commit_memory_region(struct kvm *kvm, - const struct kvm_userspace_memory_region *mem, - struct kvm_memory_slot *old, - const struct kvm_memory_slot *new, - enum kvm_mr_change change) + const struct kvm_userspace_memory_region_ext *mem, + struct kvm_memory_slot *old, + const struct kvm_memory_slot *new, + enum kvm_mr_change change) { /* * At this point memslot has been committed and there is an @@ -471,9 +471,9 @@ void kvm_arch_commit_memory_region(struct kvm *kvm, } int kvm_arch_prepare_memory_region(struct kvm *kvm, - struct kvm_memory_slot *memslot, - const struct kvm_userspace_memory_region *mem, - enum kvm_mr_change change) + struct kvm_memory_slot *memslot, + const struct kvm_userspace_memory_region_ext *mem, + enum kvm_mr_change change) { hva_t hva = mem->userspace_addr; hva_t reg_end = hva + mem->memory_size; diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index c6257f625929..dc9d1ec3d337 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -5018,9 +5018,9 @@ vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) /* Section: memory related */ int kvm_arch_prepare_memory_region(struct kvm *kvm, - struct kvm_memory_slot *memslot, - const struct kvm_userspace_memory_region *mem, - enum kvm_mr_change change) + struct kvm_memory_slot *memslot, + const struct kvm_userspace_memory_region_ext *mem, + enum kvm_mr_change change) { /* A few sanity checks. We can have memory slots which have to be located/ended at a segment boundary (1MB). The memory in userland is @@ -5043,10 +5043,10 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm, } void kvm_arch_commit_memory_region(struct kvm *kvm, - const struct kvm_userspace_memory_region *mem, - struct kvm_memory_slot *old, - const struct kvm_memory_slot *new, - enum kvm_mr_change change) + const struct kvm_userspace_memory_region_ext *mem, + struct kvm_memory_slot *old, + const struct kvm_memory_slot *new, + enum kvm_mr_change change) { int rc = 0; diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 9ab707646ed1..86a17a23d6be 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1556,9 +1556,9 @@ struct kvm_x86_ops { void (*vcpu_deliver_sipi_vector)(struct kvm_vcpu *vcpu, u8 vector); int (*prepare_memory_region)(struct kvm *kvm, - struct kvm_memory_slot *memslot, - const struct kvm_userspace_memory_region *mem, - enum kvm_mr_change change); + struct kvm_memory_slot *memslot, + const struct kvm_userspace_memory_region_ext *mem, + enum kvm_mr_change change); #ifdef CONFIG_KVM_TDX_SEAM_BACKDOOR void (*do_seamcall)(struct kvm_seamcall *call); diff --git a/arch/x86/kvm/vmx/main.c b/arch/x86/kvm/vmx/main.c index 1473fe8ce5a6..0a8bedaf9c1b 100644 --- a/arch/x86/kvm/vmx/main.c +++ b/arch/x86/kvm/vmx/main.c @@ -992,9 +992,9 @@ static void vt_setup_mce(struct kvm_vcpu *vcpu) } static int vt_prepare_memory_region(struct kvm *kvm, - struct kvm_memory_slot *memslot, - const struct kvm_userspace_memory_region *mem, - enum kvm_mr_change change) + struct kvm_memory_slot *memslot, + const struct kvm_userspace_memory_region_ext *mem, + enum kvm_mr_change change) { if (is_td(kvm)) tdx_prepare_memory_region(kvm, memslot, mem, change); diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c index 4992750b6db0..839740a98d47 100644 --- a/arch/x86/kvm/vmx/tdx.c +++ b/arch/x86/kvm/vmx/tdx.c @@ -2679,9 +2679,9 @@ static void tdx_flush_gprs(struct kvm_vcpu *vcpu) } static int tdx_prepare_memory_region(struct kvm *kvm, - struct kvm_memory_slot *memslot, - const struct kvm_userspace_memory_region *mem, - enum kvm_mr_change change) + struct kvm_memory_slot *memslot, + const struct kvm_userspace_memory_region_ext *mem, + enum kvm_mr_change change) { /* TDX Secure-EPT allows only RWX. */ if (mem->flags & KVM_MEM_READONLY) diff --git a/arch/x86/kvm/vmx/tdx_stubs.c b/arch/x86/kvm/vmx/tdx_stubs.c index 9c6023d18afd..490a5faeb411 100644 --- a/arch/x86/kvm/vmx/tdx_stubs.c +++ b/arch/x86/kvm/vmx/tdx_stubs.c @@ -28,9 +28,9 @@ static int tdx_deliver_posted_interrupt(struct kvm_vcpu *vcpu, int vector) { ret static void tdx_get_exit_info(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2, u32 *intr_info, u32 *error_code) {} static int tdx_prepare_memory_region(struct kvm *kvm, - struct kvm_memory_slot *memslot, - const struct kvm_userspace_memory_region *mem, - enum kvm_mr_change change) { return 0; } + struct kvm_memory_slot *memslot, + const struct kvm_userspace_memory_region_ext *mem, + enum kvm_mr_change change) { return 0; } static void tdx_prepare_switch_to_guest(struct kvm_vcpu *vcpu) {} static int __init tdx_check_processor_compatibility(void) { return 0; } static void __init tdx_pre_kvm_init(unsigned int *vcpu_size, diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index a02920b49b26..1558f6375949 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -11635,7 +11635,7 @@ void __user * __x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa, } for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { - struct kvm_userspace_memory_region m; + struct kvm_userspace_memory_region_ext m; m.slot = id | (i << 16); m.flags = 0; @@ -11841,9 +11841,9 @@ void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen) } int kvm_arch_prepare_memory_region(struct kvm *kvm, - struct kvm_memory_slot *memslot, - const struct kvm_userspace_memory_region *mem, - enum kvm_mr_change change) + struct kvm_memory_slot *memslot, + const struct kvm_userspace_memory_region_ext *mem, + enum kvm_mr_change change) { int err; @@ -11948,10 +11948,10 @@ static void kvm_mmu_slot_apply_flags(struct kvm *kvm, } void kvm_arch_commit_memory_region(struct kvm *kvm, - const struct kvm_userspace_memory_region *mem, - struct kvm_memory_slot *old, - const struct kvm_memory_slot *new, - enum kvm_mr_change change) + const struct kvm_userspace_memory_region_ext *mem, + struct kvm_memory_slot *old, + const struct kvm_memory_slot *new, + enum kvm_mr_change change) { if (!kvm->arch.n_requested_mmu_pages) kvm_mmu_change_mmu_pages(kvm, diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 3dd5c349f52e..99e9f9969703 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -824,20 +824,20 @@ enum kvm_mr_change { }; int kvm_set_memory_region(struct kvm *kvm, - const struct kvm_userspace_memory_region *mem); + const struct kvm_userspace_memory_region_ext *mem); int __kvm_set_memory_region(struct kvm *kvm, - const struct kvm_userspace_memory_region *mem); + const struct kvm_userspace_memory_region_ext *mem); 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, - const struct kvm_userspace_memory_region *mem, - enum kvm_mr_change change); + struct kvm_memory_slot *memslot, + const struct kvm_userspace_memory_region_ext *mem, + enum kvm_mr_change change); void kvm_arch_commit_memory_region(struct kvm *kvm, - const struct kvm_userspace_memory_region *mem, - struct kvm_memory_slot *old, - const struct kvm_memory_slot *new, - enum kvm_mr_change change); + const struct kvm_userspace_memory_region_ext *mem, + struct kvm_memory_slot *old, + const struct kvm_memory_slot *new, + enum kvm_mr_change change); /* flush all memory translations */ void kvm_arch_flush_shadow_all(struct kvm *kvm); /* flush memory translations pointing to 'slot' */ diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 7e3a8935534b..374da6767ef6 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -103,6 +103,17 @@ struct kvm_userspace_memory_region { __u64 userspace_addr; /* start of the userspace allocated memory */ }; +struct kvm_userspace_memory_region_ext { + __u32 slot; + __u32 flags; + __u64 guest_phys_addr; + __u64 memory_size; /* bytes */ + __u64 userspace_addr; /* offset into fd/private_fd */ + __s32 fd; + __s32 private_fd; /* valid if guest private memory is supported */ + __u32 padding[6]; +}; + /* * The bit 0 ~ bit 15 of kvm_memory_region::flags are visible for userspace, * other bits are reserved for kvm internal use which are defined in @@ -110,6 +121,7 @@ struct kvm_userspace_memory_region { */ #define KVM_MEM_LOG_DIRTY_PAGES (1UL << 0) #define KVM_MEM_READONLY (1UL << 1) +#define KVM_MEM_FD (1UL << 2) /* for KVM_IRQ_LINE */ struct kvm_irq_level { diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 1578be8e4441..271cef8d1cd0 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1424,7 +1424,7 @@ static void update_memslots(struct kvm_memslots *slots, } static int check_memory_region_flags(struct kvm *kvm, - const struct kvm_userspace_memory_region *mem) + const struct kvm_userspace_memory_region_ext *mem) { u32 valid_flags = 0; @@ -1537,7 +1537,7 @@ static struct kvm_memslots *kvm_dup_memslots(struct kvm_memslots *old, } static int kvm_set_memslot(struct kvm *kvm, - const struct kvm_userspace_memory_region *mem, + const struct kvm_userspace_memory_region_ext *mem, struct kvm_memory_slot *old, struct kvm_memory_slot *new, int as_id, enum kvm_mr_change change) @@ -1629,7 +1629,7 @@ static int kvm_set_memslot(struct kvm *kvm, } static int kvm_delete_memslot(struct kvm *kvm, - const struct kvm_userspace_memory_region *mem, + const struct kvm_userspace_memory_region_ext *mem, struct kvm_memory_slot *old, int as_id) { struct kvm_memory_slot new; @@ -1663,7 +1663,7 @@ static int kvm_delete_memslot(struct kvm *kvm, * Must be called holding kvm->slots_lock for write. */ int __kvm_set_memory_region(struct kvm *kvm, - const struct kvm_userspace_memory_region *mem) + const struct kvm_userspace_memory_region_ext *mem) { struct kvm_memory_slot old, new; struct kvm_memory_slot *tmp; @@ -1783,7 +1783,7 @@ int __kvm_set_memory_region(struct kvm *kvm, EXPORT_SYMBOL_GPL(__kvm_set_memory_region); int kvm_set_memory_region(struct kvm *kvm, - const struct kvm_userspace_memory_region *mem) + const struct kvm_userspace_memory_region_ext *mem) { int r; @@ -1795,7 +1795,7 @@ int kvm_set_memory_region(struct kvm *kvm, EXPORT_SYMBOL_GPL(kvm_set_memory_region); static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, - struct kvm_userspace_memory_region *mem) + struct kvm_userspace_memory_region_ext *mem) { if ((u16)mem->slot >= KVM_USER_MEM_SLOTS) return -EINVAL; @@ -4368,12 +4368,19 @@ static long kvm_vm_ioctl(struct file *filp, break; } case KVM_SET_USER_MEMORY_REGION: { - struct kvm_userspace_memory_region kvm_userspace_mem; + struct kvm_userspace_memory_region_ext kvm_userspace_mem; r = -EFAULT; if (copy_from_user(&kvm_userspace_mem, argp, - sizeof(kvm_userspace_mem))) + sizeof(struct kvm_userspace_memory_region))) goto out; + if (kvm_userspace_mem.flags & KVM_MEM_FD) { + int offset = offsetof( + struct kvm_userspace_memory_region_ext, fd); + if (copy_from_user(&kvm_userspace_mem.fd, argp + offset, + sizeof(kvm_userspace_mem) - offset)) + goto out; + } r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem); break;

[RFC,v2,03/13] KVM: Extend kvm_userspace_memory_region to support fd based memslot

Commit Message

Patch