From b3784bc28ccc0d9b44d265a1d947c8766295ba00 Mon Sep 17 00:00:00 2001 From: Axel Rasmussen Date: Wed, 19 May 2021 13:03:35 -0700 Subject: [PATCH] KVM: selftests: refactor vm_mem_backing_src_type flags Each struct vm_mem_backing_src_alias has a flags field, which denotes the flags used to mmap() an area of that type. Previously, this field never included MAP_PRIVATE | MAP_ANONYMOUS, because vm_userspace_mem_region_add assumed that *all* types would always use those flags, and so it hardcoded them. In a follow-up commit, we'll add a new type: shmem. Areas of this type must not have MAP_PRIVATE | MAP_ANONYMOUS, and instead they must have MAP_SHARED. So, refactor things. Make it so that the flags field of struct vm_mem_backing_src_alias really is a complete set of flags, and don't add in any extras in vm_userspace_mem_region_add. This will let us easily tack on shmem. Signed-off-by: Axel Rasmussen Message-Id: <20210519200339.829146-7-axelrasmussen@google.com> Signed-off-by: Paolo Bonzini --- tools/testing/selftests/kvm/lib/kvm_util.c | 3 +-- tools/testing/selftests/kvm/lib/test_util.c | 35 ++++++++++++++++------------- 2 files changed, 20 insertions(+), 18 deletions(-) diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index d00e49b73d68..491be22b410c 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -849,8 +849,7 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm, region->mmap_start = mmap(NULL, region->mmap_size, PROT_READ | PROT_WRITE, - MAP_PRIVATE | MAP_ANONYMOUS - | vm_mem_backing_src_alias(src_type)->flag, + vm_mem_backing_src_alias(src_type)->flag, -1, 0); TEST_ASSERT(region->mmap_start != MAP_FAILED, "test_malloc failed, mmap_start: %p errno: %i", diff --git a/tools/testing/selftests/kvm/lib/test_util.c b/tools/testing/selftests/kvm/lib/test_util.c index 63d2bc7d757b..06ddde068736 100644 --- a/tools/testing/selftests/kvm/lib/test_util.c +++ b/tools/testing/selftests/kvm/lib/test_util.c @@ -168,70 +168,73 @@ size_t get_def_hugetlb_pagesz(void) const struct vm_mem_backing_src_alias *vm_mem_backing_src_alias(uint32_t i) { + static const int anon_flags = MAP_PRIVATE | MAP_ANONYMOUS; + static const int anon_huge_flags = anon_flags | MAP_HUGETLB; + static const struct vm_mem_backing_src_alias aliases[] = { [VM_MEM_SRC_ANONYMOUS] = { .name = "anonymous", - .flag = 0, + .flag = anon_flags, }, [VM_MEM_SRC_ANONYMOUS_THP] = { .name = "anonymous_thp", - .flag = 0, + .flag = anon_flags, }, [VM_MEM_SRC_ANONYMOUS_HUGETLB] = { .name = "anonymous_hugetlb", - .flag = MAP_HUGETLB, + .flag = anon_huge_flags, }, [VM_MEM_SRC_ANONYMOUS_HUGETLB_16KB] = { .name = "anonymous_hugetlb_16kb", - .flag = MAP_HUGETLB | MAP_HUGE_16KB, + .flag = anon_huge_flags | MAP_HUGE_16KB, }, [VM_MEM_SRC_ANONYMOUS_HUGETLB_64KB] = { .name = "anonymous_hugetlb_64kb", - .flag = MAP_HUGETLB | MAP_HUGE_64KB, + .flag = anon_huge_flags | MAP_HUGE_64KB, }, [VM_MEM_SRC_ANONYMOUS_HUGETLB_512KB] = { .name = "anonymous_hugetlb_512kb", - .flag = MAP_HUGETLB | MAP_HUGE_512KB, + .flag = anon_huge_flags | MAP_HUGE_512KB, }, [VM_MEM_SRC_ANONYMOUS_HUGETLB_1MB] = { .name = "anonymous_hugetlb_1mb", - .flag = MAP_HUGETLB | MAP_HUGE_1MB, + .flag = anon_huge_flags | MAP_HUGE_1MB, }, [VM_MEM_SRC_ANONYMOUS_HUGETLB_2MB] = { .name = "anonymous_hugetlb_2mb", - .flag = MAP_HUGETLB | MAP_HUGE_2MB, + .flag = anon_huge_flags | MAP_HUGE_2MB, }, [VM_MEM_SRC_ANONYMOUS_HUGETLB_8MB] = { .name = "anonymous_hugetlb_8mb", - .flag = MAP_HUGETLB | MAP_HUGE_8MB, + .flag = anon_huge_flags | MAP_HUGE_8MB, }, [VM_MEM_SRC_ANONYMOUS_HUGETLB_16MB] = { .name = "anonymous_hugetlb_16mb", - .flag = MAP_HUGETLB | MAP_HUGE_16MB, + .flag = anon_huge_flags | MAP_HUGE_16MB, }, [VM_MEM_SRC_ANONYMOUS_HUGETLB_32MB] = { .name = "anonymous_hugetlb_32mb", - .flag = MAP_HUGETLB | MAP_HUGE_32MB, + .flag = anon_huge_flags | MAP_HUGE_32MB, }, [VM_MEM_SRC_ANONYMOUS_HUGETLB_256MB] = { .name = "anonymous_hugetlb_256mb", - .flag = MAP_HUGETLB | MAP_HUGE_256MB, + .flag = anon_huge_flags | MAP_HUGE_256MB, }, [VM_MEM_SRC_ANONYMOUS_HUGETLB_512MB] = { .name = "anonymous_hugetlb_512mb", - .flag = MAP_HUGETLB | MAP_HUGE_512MB, + .flag = anon_huge_flags | MAP_HUGE_512MB, }, [VM_MEM_SRC_ANONYMOUS_HUGETLB_1GB] = { .name = "anonymous_hugetlb_1gb", - .flag = MAP_HUGETLB | MAP_HUGE_1GB, + .flag = anon_huge_flags | MAP_HUGE_1GB, }, [VM_MEM_SRC_ANONYMOUS_HUGETLB_2GB] = { .name = "anonymous_hugetlb_2gb", - .flag = MAP_HUGETLB | MAP_HUGE_2GB, + .flag = anon_huge_flags | MAP_HUGE_2GB, }, [VM_MEM_SRC_ANONYMOUS_HUGETLB_16GB] = { .name = "anonymous_hugetlb_16gb", - .flag = MAP_HUGETLB | MAP_HUGE_16GB, + .flag = anon_huge_flags | MAP_HUGE_16GB, }, }; _Static_assert(ARRAY_SIZE(aliases) == NUM_SRC_TYPES, -- 2.11.0