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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Rspamd-Server: rspam12 X-Stat-Signature: 49c4ujmd7qy9bua7xausf1o995qxtqce X-Rspamd-Queue-Id: 0E05080005 X-Rspam-User: X-HE-Tag: 1769446408-803760 X-HE-Meta: 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 wYB2uYoB 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Patrick Roy =0A= =0A= Allow selftests to configure their memslots such that userspace_addr is=0A= set to a MAP_SHARED mapping of the guest_memfd that's associated with=0A= the memslot. This setup is the configuration for non-CoCo VMs, where all=0A= guest memory is backed by a guest_memfd whose folios are all marked=0A= shared, but KVM is still able to access guest memory to provide=0A= functionality such as MMIO emulation on x86.=0A= =0A= Add backing types for normal guest_memfd, as well as direct map removed=0A= guest_memfd.=0A= =0A= Signed-off-by: Patrick Roy =0A= Signed-off-by: Nikita Kalyazin =0A= ---=0A= .../testing/selftests/kvm/include/kvm_util.h | 18 ++++++=0A= .../testing/selftests/kvm/include/test_util.h | 7 +++=0A= tools/testing/selftests/kvm/lib/kvm_util.c | 61 ++++++++++---------=0A= tools/testing/selftests/kvm/lib/test_util.c | 8 +++=0A= 4 files changed, 65 insertions(+), 29 deletions(-)=0A= =0A= diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing= /selftests/kvm/include/kvm_util.h=0A= index 81f4355ff28a..6689b43810c1 100644=0A= --- a/tools/testing/selftests/kvm/include/kvm_util.h=0A= +++ b/tools/testing/selftests/kvm/include/kvm_util.h=0A= @@ -641,6 +641,24 @@ static inline bool is_smt_on(void)=0A= =0A= void vm_create_irqchip(struct kvm_vm *vm);=0A= =0A= +static inline uint32_t backing_src_guest_memfd_flags(enum vm_mem_backing_s= rc_type t)=0A= +{=0A= + uint32_t flags =3D 0;=0A= +=0A= + switch (t) {=0A= + case VM_MEM_SRC_GUEST_MEMFD_NO_DIRECT_MAP:=0A= + flags |=3D GUEST_MEMFD_FLAG_NO_DIRECT_MAP;=0A= + fallthrough;=0A= + case VM_MEM_SRC_GUEST_MEMFD:=0A= + flags |=3D GUEST_MEMFD_FLAG_MMAP | GUEST_MEMFD_FLAG_INIT_SHARED;=0A= + break;=0A= + default:=0A= + break;=0A= + }=0A= +=0A= + return flags;=0A= +}=0A= +=0A= static inline int __vm_create_guest_memfd(struct kvm_vm *vm, uint64_t size= ,=0A= uint64_t flags)=0A= {=0A= diff --git a/tools/testing/selftests/kvm/include/test_util.h b/tools/testin= g/selftests/kvm/include/test_util.h=0A= index 8140e59b59e5..ea6de20ce8ef 100644=0A= --- a/tools/testing/selftests/kvm/include/test_util.h=0A= +++ b/tools/testing/selftests/kvm/include/test_util.h=0A= @@ -152,6 +152,8 @@ enum vm_mem_backing_src_type {=0A= VM_MEM_SRC_ANONYMOUS_HUGETLB_16GB,=0A= VM_MEM_SRC_SHMEM,=0A= VM_MEM_SRC_SHARED_HUGETLB,=0A= + VM_MEM_SRC_GUEST_MEMFD,=0A= + VM_MEM_SRC_GUEST_MEMFD_NO_DIRECT_MAP,=0A= NUM_SRC_TYPES,=0A= };=0A= =0A= @@ -184,6 +186,11 @@ static inline bool backing_src_is_shared(enum vm_mem_b= acking_src_type t)=0A= return vm_mem_backing_src_alias(t)->flag & MAP_SHARED;=0A= }=0A= =0A= +static inline bool backing_src_is_guest_memfd(enum vm_mem_backing_src_type= t)=0A= +{=0A= + return t =3D=3D VM_MEM_SRC_GUEST_MEMFD || t =3D=3D VM_MEM_SRC_GUEST_MEMFD= _NO_DIRECT_MAP;=0A= +}=0A= +=0A= static inline bool backing_src_can_be_huge(enum vm_mem_backing_src_type t)= =0A= {=0A= return t !=3D VM_MEM_SRC_ANONYMOUS && t !=3D VM_MEM_SRC_SHMEM;=0A= diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/sel= ftests/kvm/lib/kvm_util.c=0A= index 0a2999d8ef47..28ee51253909 100644=0A= --- a/tools/testing/selftests/kvm/lib/kvm_util.c=0A= +++ b/tools/testing/selftests/kvm/lib/kvm_util.c=0A= @@ -1013,6 +1013,33 @@ void vm_mem_add(struct kvm_vm *vm, enum vm_mem_backi= ng_src_type src_type,=0A= alignment =3D 1;=0A= #endif=0A= =0A= + if (guest_memfd < 0) {=0A= + if ((flags & KVM_MEM_GUEST_MEMFD) || backing_src_is_guest_memfd(src_type= )) {=0A= + uint32_t guest_memfd_flags =3D backing_src_guest_memfd_flags(src_type);= =0A= +=0A= + TEST_ASSERT(!guest_memfd_offset,=0A= + "Offset must be zero when creating new guest_memfd");=0A= + guest_memfd =3D vm_create_guest_memfd(vm, mem_size, guest_memfd_flags);= =0A= + }=0A= + } else {=0A= + /*=0A= + * Install a unique fd for each memslot so that the fd=0A= + * can be closed when the region is deleted without=0A= + * needing to track if the fd is owned by the framework=0A= + * or by the caller.=0A= + */=0A= + guest_memfd =3D kvm_dup(guest_memfd);=0A= + }=0A= +=0A= + if (guest_memfd > 0) {=0A= + flags |=3D KVM_MEM_GUEST_MEMFD;=0A= +=0A= + region->region.guest_memfd =3D guest_memfd;=0A= + region->region.guest_memfd_offset =3D guest_memfd_offset;=0A= + } else {=0A= + region->region.guest_memfd =3D -1;=0A= + }=0A= +=0A= /*=0A= * When using THP mmap is not guaranteed to returned a hugepage aligned= =0A= * address so we have to pad the mmap. Padding is not needed for HugeTLB= =0A= @@ -1028,10 +1055,13 @@ void vm_mem_add(struct kvm_vm *vm, enum vm_mem_back= ing_src_type src_type,=0A= if (alignment > 1)=0A= region->mmap_size +=3D alignment;=0A= =0A= - region->fd =3D -1;=0A= - if (backing_src_is_shared(src_type))=0A= + if (backing_src_is_guest_memfd(src_type))=0A= + region->fd =3D guest_memfd;=0A= + else if (backing_src_is_shared(src_type))=0A= region->fd =3D kvm_memfd_alloc(region->mmap_size,=0A= src_type =3D=3D VM_MEM_SRC_SHARED_HUGETLB);=0A= + else=0A= + region->fd =3D -1;=0A= =0A= region->mmap_start =3D kvm_mmap(region->mmap_size, PROT_READ | PROT_WRITE= ,=0A= vm_mem_backing_src_alias(src_type)->flag,=0A= @@ -1056,33 +1086,6 @@ void vm_mem_add(struct kvm_vm *vm, enum vm_mem_backi= ng_src_type src_type,=0A= }=0A= =0A= region->backing_src_type =3D src_type;=0A= -=0A= - if (guest_memfd < 0) {=0A= - if (flags & KVM_MEM_GUEST_MEMFD) {=0A= - uint32_t guest_memfd_flags =3D 0;=0A= - TEST_ASSERT(!guest_memfd_offset,=0A= - "Offset must be zero when creating new guest_memfd");=0A= - guest_memfd =3D vm_create_guest_memfd(vm, mem_size, guest_memfd_flags);= =0A= - }=0A= - } else {=0A= - /*=0A= - * Install a unique fd for each memslot so that the fd=0A= - * can be closed when the region is deleted without=0A= - * needing to track if the fd is owned by the framework=0A= - * or by the caller.=0A= - */=0A= - guest_memfd =3D kvm_dup(guest_memfd);=0A= - }=0A= -=0A= - if (guest_memfd >=3D 0) {=0A= - flags |=3D KVM_MEM_GUEST_MEMFD;=0A= -=0A= - region->region.guest_memfd =3D guest_memfd;=0A= - region->region.guest_memfd_offset =3D guest_memfd_offset;=0A= - } else {=0A= - region->region.guest_memfd =3D -1;=0A= - }=0A= -=0A= region->unused_phy_pages =3D sparsebit_alloc();=0A= if (vm_arch_has_protected_memory(vm))=0A= region->protected_phy_pages =3D sparsebit_alloc();=0A= diff --git a/tools/testing/selftests/kvm/lib/test_util.c b/tools/testing/se= lftests/kvm/lib/test_util.c=0A= index 8a1848586a85..ce9fe0271515 100644=0A= --- a/tools/testing/selftests/kvm/lib/test_util.c=0A= +++ b/tools/testing/selftests/kvm/lib/test_util.c=0A= @@ -306,6 +306,14 @@ const struct vm_mem_backing_src_alias *vm_mem_backing_= src_alias(uint32_t i)=0A= */=0A= .flag =3D MAP_SHARED,=0A= },=0A= + [VM_MEM_SRC_GUEST_MEMFD] =3D {=0A= + .name =3D "guest_memfd",=0A= + .flag =3D MAP_SHARED,=0A= + },=0A= + [VM_MEM_SRC_GUEST_MEMFD_NO_DIRECT_MAP] =3D {=0A= + .name =3D "guest_memfd_no_direct_map",=0A= + .flag =3D MAP_SHARED,=0A= + }=0A= };=0A= _Static_assert(ARRAY_SIZE(aliases) =3D=3D NUM_SRC_TYPES,=0A= "Missing new backing src types?");=0A= -- =0A= 2.50.1=0A= =0A=