From 290c5b54012b7f05e9c51af32d557574bf69a654 Mon Sep 17 00:00:00 2001 From: Ricardo Koller Date: Mon, 17 Oct 2022 19:58:27 +0000 Subject: KVM: selftests: Add vm->memslots[] and enum kvm_mem_region_type The vm_create() helpers are hardcoded to place most page types (code, page-tables, stacks, etc) in the same memslot #0, and always backed with anonymous 4K. There are a couple of issues with that. First, tests willing to differ a bit, like placing page-tables in a different backing source type must replicate much of what's already done by the vm_create() functions. Second, the hardcoded assumption of memslot #0 holding most things is spread everywhere; this makes it very hard to change. Fix the above issues by having selftests specify how they want memory to be laid out. Start by changing ____vm_create() to not create memslot #0; a test (to come) will specify all memslots used by the VM. Then, add the vm->memslots[] array to specify the right memslot for different memory allocators, e.g.,: lib/elf should use the vm->[MEM_REGION_CODE] memslot. This will be used as a way to specify the page-tables memslots (to be backed by huge pages for example). There is no functional change intended. The current commit lays out memory exactly as before. A future commit will change the allocators to get the region they should be using, e.g.,: like the page table allocators using the pt memslot. Cc: Sean Christopherson Cc: Andrew Jones Signed-off-by: Ricardo Koller Reviewed-by: Andrew Jones Reviewed-by: Sean Christopherson Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20221017195834.2295901-8-ricarkol@google.com --- tools/testing/selftests/kvm/lib/kvm_util.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) (limited to 'tools/testing/selftests/kvm/lib/kvm_util.c') diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index 6affce47e899..f3dfa4e9ee0f 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -185,13 +185,10 @@ const struct vm_guest_mode_params vm_guest_mode_params[] = { _Static_assert(sizeof(vm_guest_mode_params)/sizeof(struct vm_guest_mode_params) == NUM_VM_MODES, "Missing new mode params?"); -struct kvm_vm *____vm_create(enum vm_guest_mode mode, uint64_t nr_pages) +struct kvm_vm *____vm_create(enum vm_guest_mode mode) { struct kvm_vm *vm; - pr_debug("%s: mode='%s' pages='%ld'\n", __func__, - vm_guest_mode_string(mode), nr_pages); - vm = calloc(1, sizeof(*vm)); TEST_ASSERT(vm != NULL, "Insufficient Memory"); @@ -287,9 +284,6 @@ struct kvm_vm *____vm_create(enum vm_guest_mode mode, uint64_t nr_pages) /* Allocate and setup memory for guest. */ vm->vpages_mapped = sparsebit_alloc(); - if (nr_pages != 0) - vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, - 0, 0, nr_pages, 0); return vm; } @@ -335,8 +329,16 @@ struct kvm_vm *__vm_create(enum vm_guest_mode mode, uint32_t nr_runnable_vcpus, uint64_t nr_pages = vm_nr_pages_required(mode, nr_runnable_vcpus, nr_extra_pages); struct kvm_vm *vm; + int i; + + pr_debug("%s: mode='%s' pages='%ld'\n", __func__, + vm_guest_mode_string(mode), nr_pages); + + vm = ____vm_create(mode); - vm = ____vm_create(mode, nr_pages); + vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, 0, 0, nr_pages, 0); + for (i = 0; i < NR_MEM_REGIONS; i++) + vm->memslots[i] = 0; kvm_vm_elf_load(vm, program_invocation_name); -- cgit v1.2.3