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 spreaded
everywhere; this makes it very hard to change.
Fix the above issues by having selftests specify how they want memory to be
laid out: define the memory regions to use for code, pt (page-tables), and
data. Introduce a new structure, struct kvm_vm_mem_params, that defines: guest
mode, a list of memory region descriptions, and some fields specifying what
regions to use for code, pt, and data.
There is no functional change intended. The current commit adds a default
struct kvm_vm_mem_params that lays out memory exactly as before. The next
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 <seanjc@xxxxxxxxxx>
Cc: Andrew Jones <andrew.jones@xxxxxxxxx>
Signed-off-by: Ricardo Koller <ricarkol@xxxxxxxxxx>
---
.../selftests/kvm/include/kvm_util_base.h | 51 +++++++++++++++-
.../selftests/kvm/lib/aarch64/processor.c | 3 +-
tools/testing/selftests/kvm/lib/kvm_util.c | 58 ++++++++++++++++---
3 files changed, 102 insertions(+), 10 deletions(-)
diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
index b2dbe253d4d0..5dbca38a512b 100644
--- a/tools/testing/selftests/kvm/include/kvm_util_base.h
+++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
@@ -65,6 +65,13 @@ struct userspace_mem_regions {
DECLARE_HASHTABLE(slot_hash, 9);
};
+enum kvm_mem_region_type {
+ MEM_REGION_CODE,
+ MEM_REGION_PT,
+ MEM_REGION_DATA,
+ NR_MEM_REGIONS,
+};
+
struct kvm_vm {
int mode;
unsigned long type;
@@ -93,6 +100,13 @@ struct kvm_vm {
int stats_fd;
struct kvm_stats_header stats_header;
struct kvm_stats_desc *stats_desc;
+
+ /*
+ * KVM region slots. These are the default memslots used by page
+ * allocators, e.g., lib/elf uses the memslots[MEM_REGION_CODE]
+ * memslot.
+ */
+ uint32_t memslots[NR_MEM_REGIONS];
};
@@ -105,6 +119,13 @@ struct kvm_vm {
struct userspace_mem_region *
memslot2region(struct kvm_vm *vm, uint32_t memslot);
+inline struct userspace_mem_region *
+vm_get_mem_region(struct kvm_vm *vm, enum kvm_mem_region_type mrt)
+{
+ assert(mrt < NR_MEM_REGIONS);
+ return memslot2region(vm, vm->memslots[mrt]);
+}
+
/* Minimum allocated guest virtual and physical addresses */
#define KVM_UTIL_MIN_VADDR 0x2000
#define KVM_GUEST_PAGE_TABLE_MIN_PADDR 0x180000
@@ -637,19 +658,45 @@ vm_paddr_t vm_phy_pages_alloc(struct kvm_vm *vm, size_t num,
vm_paddr_t paddr_min, uint32_t memslot);
vm_paddr_t vm_alloc_page_table(struct kvm_vm *vm);
+struct kvm_vm_mem_params {
+ enum vm_guest_mode mode;
+
+ struct {
+ enum vm_mem_backing_src_type src_type;
+ uint64_t guest_paddr;
+ /*
+ * KVM region slot (same meaning as in struct
+ * kvm_userspace_memory_region).
+ */
+ uint32_t slot;
+ uint64_t npages;
+ uint32_t flags;
+ bool enabled;
+ } region[NR_MEM_REGIONS];
+
+ /* Each region type points to a region in the above array. */
+ uint16_t region_idx[NR_MEM_REGIONS];
+};
+
+extern struct kvm_vm_mem_params kvm_vm_mem_default;
+
/*
* ____vm_create() does KVM_CREATE_VM and little else. __vm_create() also
* loads the test binary into guest memory and creates an IRQ chip (x86 only).
* __vm_create() does NOT create vCPUs, @nr_runnable_vcpus is used purely to
* calculate the amount of memory needed for per-vCPU data, e.g. stacks.
*/
-struct kvm_vm *____vm_create(enum vm_guest_mode mode, uint64_t nr_pages);
+struct kvm_vm *____vm_create(struct kvm_vm_mem_params *mem_params);
struct kvm_vm *__vm_create(enum vm_guest_mode mode, uint32_t nr_runnable_vcpus,
uint64_t nr_extra_pages);
static inline struct kvm_vm *vm_create_barebones(void)
{
- return ____vm_create(VM_MODE_DEFAULT, 0);
+ struct kvm_vm_mem_params params_wo_memslots = {
+ .mode = kvm_vm_mem_default.mode,
+ };
+
+ return ____vm_create(¶ms_wo_memslots);
}
static inline struct kvm_vm *vm_create(uint32_t nr_runnable_vcpus)
diff --git a/tools/testing/selftests/kvm/lib/aarch64/processor.c b/tools/testing/selftests/kvm/lib/aarch64/processor.c
index 26f0eccff6fe..5a31dc85d054 100644
--- a/tools/testing/selftests/kvm/lib/aarch64/processor.c
+++ b/tools/testing/selftests/kvm/lib/aarch64/processor.c
@@ -508,7 +508,8 @@ void aarch64_get_supported_page_sizes(uint32_t ipa,
*/
void __attribute__((constructor)) init_guest_modes(void)
{
- guest_modes_append_default();
+ guest_modes_append_default();
+ kvm_vm_mem_default.mode = VM_MODE_DEFAULT;
}
void smccc_hvc(uint32_t function_id, uint64_t arg0, uint64_t arg1,
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 5a9f080ff888..02532bc528da 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -143,12 +143,37 @@ 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)
+/*
+ * A single memslot #0 for code, data, and page tables.
+ *
+ * .region[0].npages should be set by the user.
+ */
+struct kvm_vm_mem_params kvm_vm_mem_default = {
+#ifndef __aarch64__
+ /* arm64 kvm_vm_mem_default.mode set in init_guest_modes() */
+ .mode = VM_MODE_DEFAULT,
+#endif
+ .region[0] = {
+ .src_type = VM_MEM_SRC_ANONYMOUS,
+ .guest_paddr = 0,
+ .slot = 0,
+ .npages = 0,
+ .flags = 0,
+ .enabled = true,
+ },
+ .region_idx[MEM_REGION_CODE] = 0,
+ .region_idx[MEM_REGION_PT] = 0,
+ .region_idx[MEM_REGION_DATA] = 0,
+};
+
+struct kvm_vm *____vm_create(struct kvm_vm_mem_params *mem_params)
{
+ enum vm_guest_mode mode = mem_params->mode;
struct kvm_vm *vm;
+ enum kvm_mem_region_type mrt;
+ int idx;
- pr_debug("%s: mode='%s' pages='%ld'\n", __func__,
- vm_guest_mode_string(mode), nr_pages);
+ pr_debug("%s: mode='%s'\n", __func__, vm_guest_mode_string(mode));
vm = calloc(1, sizeof(*vm));
TEST_ASSERT(vm != NULL, "Insufficient Memory");
@@ -245,9 +270,25 @@ 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);
+
+ /* Create all mem regions according to mem_params specifications. */
+ for (idx = 0; idx < NR_MEM_REGIONS; idx++) {
+ if (!mem_params->region[idx].enabled)
+ continue;
+
+ vm_userspace_mem_region_add(vm,
+ mem_params->region[idx].src_type,
+ mem_params->region[idx].guest_paddr,
+ mem_params->region[idx].slot,
+ mem_params->region[idx].npages,
+ mem_params->region[idx].flags);
+ }
+
+ /* Set all memslot types for the VM, also according to the spec. */
+ for (mrt = 0; mrt < NR_MEM_REGIONS; mrt++) {
+ idx = mem_params->region_idx[mrt];
+ vm->memslots[mrt] = mem_params->region[idx].slot;
+ }
return vm;
}
@@ -292,9 +333,12 @@ 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_mem_params mem_params = kvm_vm_mem_default;
struct kvm_vm *vm;
- vm = ____vm_create(mode, nr_pages);
+ mem_params.region[0].npages = nr_pages;
+ mem_params.mode = mode;
+ vm = ____vm_create(&mem_params);
kvm_vm_elf_load(vm, program_invocation_name);
--
2.37.2.789.g6183377224-goog
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