From bb2968ad6c33c0902dce48ea57d58c5bb4f3c617 Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Fri, 27 Oct 2023 11:22:08 -0700 Subject: KVM: selftests: Add support for creating private memslots Add support for creating "private" memslots via KVM_CREATE_GUEST_MEMFD and KVM_SET_USER_MEMORY_REGION2. Make vm_userspace_mem_region_add() a wrapper to its effective replacement, vm_mem_add(), so that private memslots are fully opt-in, i.e. don't require update all tests that add memory regions. Pivot on the KVM_MEM_PRIVATE flag instead of the validity of the "gmem" file descriptor so that simple tests can let vm_mem_add() do the heavy lifting of creating the guest memfd, but also allow the caller to pass in an explicit fd+offset so that fancier tests can do things like back multiple memslots with a single file. If the caller passes in a fd, dup() the fd so that (a) __vm_mem_region_delete() can close the fd associated with the memory region without needing yet another flag, and (b) so that the caller can safely close its copy of the fd without having to first destroy memslots. Co-developed-by: Ackerley Tng Signed-off-by: Ackerley Tng Signed-off-by: Sean Christopherson Message-Id: <20231027182217.3615211-27-seanjc@google.com> Reviewed-by: Fuad Tabba Tested-by: Fuad Tabba Signed-off-by: Paolo Bonzini --- tools/testing/selftests/kvm/include/test_util.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'tools/testing/selftests/kvm/include/test_util.h') diff --git a/tools/testing/selftests/kvm/include/test_util.h b/tools/testing/selftests/kvm/include/test_util.h index 7e614adc6cf4..7257f2243ab9 100644 --- a/tools/testing/selftests/kvm/include/test_util.h +++ b/tools/testing/selftests/kvm/include/test_util.h @@ -142,6 +142,11 @@ static inline bool backing_src_is_shared(enum vm_mem_backing_src_type t) return vm_mem_backing_src_alias(t)->flag & MAP_SHARED; } +static inline bool backing_src_can_be_huge(enum vm_mem_backing_src_type t) +{ + return t != VM_MEM_SRC_ANONYMOUS && t != VM_MEM_SRC_SHMEM; +} + /* Aligns x up to the next multiple of size. Size must be a power of 2. */ static inline uint64_t align_up(uint64_t x, uint64_t size) { -- cgit v1.2.3