Hi,
This v3 series can mainly include two parts.
Based on kvm queue branch: https://git.kernel.org/pub/scm/virt/kvm/kvm.git/log/?h=queue
Links of v1: https://lore.kernel.org/lkml/[email protected]/
Links of v2: https://lore.kernel.org/lkml/[email protected]/
In the first part, all the known hugetlb backing src types specified
with different hugepage sizes are listed, so that we can specify use
of hugetlb source of the exact granularity that we want, instead of
the system default ones. And as all the known hugetlb page sizes are
listed, it's appropriate for all architectures. Besides, a helper that
can get granularity of different backing src types(anonumous/thp/hugetlb)
is added, so that we can use the accurate backing src granularity for
kinds of alignment or guest memory accessing of vcpus.
In the second part, a new test is added:
This test is added to serve as a performance tester and a bug reproducer
for kvm page table code (GPA->HPA mappings), it gives guidance for the
people trying to make some improvement for kvm. And the following explains
what we can exactly do through this test.
The function guest_code() can cover the conditions where a single vcpu or
multiple vcpus access guest pages within the same memory region, in three
VM stages(before dirty logging, during dirty logging, after dirty logging).
Besides, the backing src memory type(ANONYMOUS/THP/HUGETLB) of the tested
memory region can be specified by users, which means normal page mappings
or block mappings can be chosen by users to be created in the test.
If ANONYMOUS memory is specified, kvm will create normal page mappings
for the tested memory region before dirty logging, and update attributes
of the page mappings from RO to RW during dirty logging. If THP/HUGETLB
memory is specified, kvm will create block mappings for the tested memory
region before dirty logging, and split the blcok mappings into normal page
mappings during dirty logging, and coalesce the page mappings back into
block mappings after dirty logging is stopped.
So in summary, as a performance tester, this test can present the
performance of kvm creating/updating normal page mappings, or the
performance of kvm creating/splitting/recovering block mappings,
through execution time.
When we need to coalesce the page mappings back to block mappings after
dirty logging is stopped, we have to firstly invalidate *all* the TLB
entries for the page mappings right before installation of the block entry,
because a TLB conflict abort error could occur if we can't invalidate the
TLB entries fully. We have hit this TLB conflict twice on aarch64 software
implementation and fixed it. As this test can imulate process from dirty
logging enabled to dirty logging stopped of a VM with block mappings,
so it can also reproduce this TLB conflict abort due to inadequate TLB
invalidation when coalescing tables.
Links about the TLB conflict abort:
https://lore.kernel.org/lkml/[email protected]/
---
Change logs:
v2->v3:
- Add tags of Suggested-by, Reviewed-by in the patches
- Add a generic micro to get hugetlb page sizes
- Some changes for suggestions about v2 series
v1->v2:
- Add a patch to sync header files
- Add helpers to get granularity of different backing src types
- Some changes for suggestions about v1 series
---
Yanan Wang (7):
tools headers: sync headers of asm-generic/hugetlb_encode.h
tools headers: Add a macro to get HUGETLB page sizes for mmap
KVM: selftests: Use flag CLOCK_MONOTONIC_RAW for timing
KVM: selftests: Make a generic helper to get vm guest mode strings
KVM: selftests: Add a helper to get system configured THP page size
KVM: selftests: List all hugetlb src types specified with page sizes
KVM: selftests: Adapt vm_userspace_mem_region_add to new helpers
KVM: selftests: Add a test for kvm page table code
include/uapi/linux/mman.h | 2 +
tools/include/asm-generic/hugetlb_encode.h | 3 +
tools/include/uapi/linux/mman.h | 2 +
tools/testing/selftests/kvm/Makefile | 3 +
.../selftests/kvm/demand_paging_test.c | 8 +-
.../selftests/kvm/dirty_log_perf_test.c | 14 +-
.../testing/selftests/kvm/include/kvm_util.h | 4 +-
.../testing/selftests/kvm/include/test_util.h | 21 +-
.../selftests/kvm/kvm_page_table_test.c | 476 ++++++++++++++++++
tools/testing/selftests/kvm/lib/kvm_util.c | 59 ++-
tools/testing/selftests/kvm/lib/test_util.c | 92 +++-
tools/testing/selftests/kvm/steal_time.c | 4 +-
12 files changed, 628 insertions(+), 60 deletions(-)
create mode 100644 tools/testing/selftests/kvm/kvm_page_table_test.c
--
2.19.1
For generality and conciseness, make an API which can be used in all
kvm libs and selftests to get vm guest mode strings. And the index i
is checked in the API in case of possiable faults.
Reviewed-by: Andrew Jones <[email protected]>
Suggested-by: Sean Christopherson <[email protected]>
Signed-off-by: Yanan Wang <[email protected]>
---
.../testing/selftests/kvm/include/kvm_util.h | 4 +--
tools/testing/selftests/kvm/lib/kvm_util.c | 29 ++++++++++++-------
2 files changed, 19 insertions(+), 14 deletions(-)
diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
index 2d7eb6989e83..f52a7492f47f 100644
--- a/tools/testing/selftests/kvm/include/kvm_util.h
+++ b/tools/testing/selftests/kvm/include/kvm_util.h
@@ -68,9 +68,6 @@ enum vm_guest_mode {
#define MIN_PAGE_SIZE (1U << MIN_PAGE_SHIFT)
#define PTES_PER_MIN_PAGE ptes_per_page(MIN_PAGE_SIZE)
-#define vm_guest_mode_string(m) vm_guest_mode_string[m]
-extern const char * const vm_guest_mode_string[];
-
struct vm_guest_mode_params {
unsigned int pa_bits;
unsigned int va_bits;
@@ -84,6 +81,7 @@ int vm_enable_cap(struct kvm_vm *vm, struct kvm_enable_cap *cap);
int vcpu_enable_cap(struct kvm_vm *vm, uint32_t vcpu_id,
struct kvm_enable_cap *cap);
void vm_enable_dirty_ring(struct kvm_vm *vm, uint32_t ring_size);
+const char *vm_guest_mode_string(uint32_t i);
struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm);
void kvm_vm_free(struct kvm_vm *vmp);
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index d787cb802b4a..cc22c4ab7d67 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -141,17 +141,24 @@ static void vm_open(struct kvm_vm *vm, int perm)
"rc: %i errno: %i", vm->fd, errno);
}
-const char * const vm_guest_mode_string[] = {
- "PA-bits:52, VA-bits:48, 4K pages",
- "PA-bits:52, VA-bits:48, 64K pages",
- "PA-bits:48, VA-bits:48, 4K pages",
- "PA-bits:48, VA-bits:48, 64K pages",
- "PA-bits:40, VA-bits:48, 4K pages",
- "PA-bits:40, VA-bits:48, 64K pages",
- "PA-bits:ANY, VA-bits:48, 4K pages",
-};
-_Static_assert(sizeof(vm_guest_mode_string)/sizeof(char *) == NUM_VM_MODES,
- "Missing new mode strings?");
+const char *vm_guest_mode_string(uint32_t i)
+{
+ static const char * const strings[] = {
+ [VM_MODE_P52V48_4K] = "PA-bits:52, VA-bits:48, 4K pages",
+ [VM_MODE_P52V48_64K] = "PA-bits:52, VA-bits:48, 64K pages",
+ [VM_MODE_P48V48_4K] = "PA-bits:48, VA-bits:48, 4K pages",
+ [VM_MODE_P48V48_64K] = "PA-bits:48, VA-bits:48, 64K pages",
+ [VM_MODE_P40V48_4K] = "PA-bits:40, VA-bits:48, 4K pages",
+ [VM_MODE_P40V48_64K] = "PA-bits:40, VA-bits:48, 64K pages",
+ [VM_MODE_PXXV48_4K] = "PA-bits:ANY, VA-bits:48, 4K pages",
+ };
+ _Static_assert(sizeof(strings)/sizeof(char *) == NUM_VM_MODES,
+ "Missing new mode strings?");
+
+ TEST_ASSERT(i < NUM_VM_MODES, "Guest mode ID %d too big", i);
+
+ return strings[i];
+}
const struct vm_guest_mode_params vm_guest_mode_params[] = {
{ 52, 48, 0x1000, 12 },
--
2.23.0
This test serves as a performance tester and a bug reproducer for
kvm page table code (GPA->HPA mappings), so it gives guidance for
people trying to make some improvement for kvm.
The function guest_code() can cover the conditions where a single vcpu or
multiple vcpus access guest pages within the same memory region, in three
VM stages(before dirty logging, during dirty logging, after dirty logging).
Besides, the backing src memory type(ANONYMOUS/THP/HUGETLB) of the tested
memory region can be specified by users, which means normal page mappings
or block mappings can be chosen by users to be created in the test.
If ANONYMOUS memory is specified, kvm will create normal page mappings
for the tested memory region before dirty logging, and update attributes
of the page mappings from RO to RW during dirty logging. If THP/HUGETLB
memory is specified, kvm will create block mappings for the tested memory
region before dirty logging, and split the blcok mappings into normal page
mappings during dirty logging, and coalesce the page mappings back into
block mappings after dirty logging is stopped.
So in summary, as a performance tester, this test can present the
performance of kvm creating/updating normal page mappings, or the
performance of kvm creating/splitting/recovering block mappings,
through execution time.
When we need to coalesce the page mappings back to block mappings after
dirty logging is stopped, we have to firstly invalidate *all* the TLB
entries for the page mappings right before installation of the block entry,
because a TLB conflict abort error could occur if we can't invalidate the
TLB entries fully. We have hit this TLB conflict twice on aarch64 software
implementation and fixed it. As this test can imulate process from dirty
logging enabled to dirty logging stopped of a VM with block mappings,
so it can also reproduce this TLB conflict abort due to inadequate TLB
invalidation when coalescing tables.
Signed-off-by: Yanan Wang <[email protected]>
---
tools/testing/selftests/kvm/Makefile | 3 +
.../selftests/kvm/kvm_page_table_test.c | 476 ++++++++++++++++++
2 files changed, 479 insertions(+)
create mode 100644 tools/testing/selftests/kvm/kvm_page_table_test.c
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index a6d61f451f88..bac81924166d 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -67,6 +67,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/xen_vmcall_test
TEST_GEN_PROGS_x86_64 += demand_paging_test
TEST_GEN_PROGS_x86_64 += dirty_log_test
TEST_GEN_PROGS_x86_64 += dirty_log_perf_test
+TEST_GEN_PROGS_x86_64 += kvm_page_table_test
TEST_GEN_PROGS_x86_64 += hardware_disable_test
TEST_GEN_PROGS_x86_64 += kvm_create_max_vcpus
TEST_GEN_PROGS_x86_64 += memslot_modification_stress_test
@@ -78,6 +79,7 @@ TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list-sve
TEST_GEN_PROGS_aarch64 += demand_paging_test
TEST_GEN_PROGS_aarch64 += dirty_log_test
TEST_GEN_PROGS_aarch64 += dirty_log_perf_test
+TEST_GEN_PROGS_aarch64 += kvm_page_table_test
TEST_GEN_PROGS_aarch64 += kvm_create_max_vcpus
TEST_GEN_PROGS_aarch64 += set_memory_region_test
TEST_GEN_PROGS_aarch64 += steal_time
@@ -87,6 +89,7 @@ TEST_GEN_PROGS_s390x += s390x/resets
TEST_GEN_PROGS_s390x += s390x/sync_regs_test
TEST_GEN_PROGS_s390x += demand_paging_test
TEST_GEN_PROGS_s390x += dirty_log_test
+TEST_GEN_PROGS_s390x += kvm_page_table_test
TEST_GEN_PROGS_s390x += kvm_create_max_vcpus
TEST_GEN_PROGS_s390x += set_memory_region_test
diff --git a/tools/testing/selftests/kvm/kvm_page_table_test.c b/tools/testing/selftests/kvm/kvm_page_table_test.c
new file mode 100644
index 000000000000..032b49d1483b
--- /dev/null
+++ b/tools/testing/selftests/kvm/kvm_page_table_test.c
@@ -0,0 +1,476 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * KVM page table test
+ *
+ * Copyright (C) 2021, Huawei, Inc.
+ *
+ * Make sure that THP has been enabled or enough HUGETLB pages with specific
+ * page size have been pre-allocated on your system, if you are planning to
+ * use hugepages to back the guest memory for testing.
+ */
+
+#define _GNU_SOURCE /* for program_invocation_name */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <pthread.h>
+
+#include "test_util.h"
+#include "kvm_util.h"
+#include "processor.h"
+#include "guest_modes.h"
+
+#define TEST_MEM_SLOT_INDEX 1
+
+/* Default size(1GB) of the memory for testing */
+#define DEFAULT_TEST_MEM_SIZE (1 << 30)
+
+/* Default guest test virtual memory offset */
+#define DEFAULT_GUEST_TEST_MEM 0xc0000000
+
+/* Number of guest memory accessing types(read/write) */
+#define NUM_ACCESS_TYPES 2
+
+/* Different guest memory accessing stages */
+enum test_stage {
+ KVM_BEFORE_MAPPINGS,
+ KVM_CREATE_MAPPINGS,
+ KVM_UPDATE_MAPPINGS,
+ KVM_ADJUST_MAPPINGS,
+ NUM_TEST_STAGES,
+};
+
+static const char * const test_stage_string[] = {
+ "KVM_BEFORE_MAPPINGS",
+ "KVM_CREATE_MAPPINGS",
+ "KVM_UPDATE_MAPPINGS",
+ "KVM_ADJUST_MAPPINGS",
+};
+
+struct perf_test_vcpu_args {
+ int vcpu_id;
+ bool vcpu_write;
+};
+
+struct perf_test_args {
+ struct kvm_vm *vm;
+ uint64_t guest_test_virt_mem;
+ uint64_t host_page_size;
+ uint64_t host_num_pages;
+ uint64_t large_page_size;
+ uint64_t large_num_pages;
+ uint64_t host_pages_per_lpage;
+ enum vm_mem_backing_src_type src_type;
+ struct perf_test_vcpu_args vcpu_args[KVM_MAX_VCPUS];
+};
+
+/*
+ * Guest variables. Use addr_gva2hva() if these variables need
+ * to be changed in host.
+ */
+static enum test_stage guest_test_stage;
+
+/* Host variables */
+static uint32_t nr_vcpus = 1;
+static struct perf_test_args perf_test_args;
+static enum test_stage *current_stage;
+static enum test_stage vcpu_last_completed_stage[KVM_MAX_VCPUS];
+static bool host_quit;
+
+/*
+ * Guest physical memory offset of the testing memory slot.
+ * This will be set to the topmost valid physical address minus
+ * the test memory size.
+ */
+static uint64_t guest_test_phys_mem;
+
+/*
+ * Guest virtual memory offset of the testing memory slot.
+ * Must not conflict with identity mapped test code.
+ */
+static uint64_t guest_test_virt_mem = DEFAULT_GUEST_TEST_MEM;
+
+static void guest_code(int vcpu_id)
+{
+ struct perf_test_vcpu_args *vcpu_args = &perf_test_args.vcpu_args[vcpu_id];
+ enum vm_mem_backing_src_type src_type = perf_test_args.src_type;
+ uint64_t host_page_size = perf_test_args.host_page_size;
+ uint64_t host_num_pages = perf_test_args.host_num_pages;
+ uint64_t large_page_size = perf_test_args.large_page_size;
+ uint64_t large_num_pages = perf_test_args.large_num_pages;
+ uint64_t host_pages_per_lpage = perf_test_args.host_pages_per_lpage;
+ uint64_t half = host_pages_per_lpage / 2;
+ bool vcpu_write;
+ enum test_stage stage;
+ uint64_t addr;
+ int i, j;
+
+ /* Make sure vCPU args data structure is not corrupt */
+ GUEST_ASSERT(vcpu_args->vcpu_id == vcpu_id);
+ vcpu_write = vcpu_args->vcpu_write;
+
+ while (true) {
+ stage = READ_ONCE(guest_test_stage);
+ addr = perf_test_args.guest_test_virt_mem;
+
+ switch (stage) {
+ /*
+ * Before dirty logging, vCPUs concurrently access the first
+ * 8 bytes of each page (host page/large page) within the same
+ * memory region with different accessing types (read/write).
+ * Then KVM will create normal page mappings or huge block
+ * mappings for them.
+ */
+ case KVM_CREATE_MAPPINGS:
+ for (i = 0; i < large_num_pages; i++) {
+ if (vcpu_write)
+ *(uint64_t *)addr = 0x0123456789ABCDEF;
+ else
+ READ_ONCE(*(uint64_t *)addr);
+
+ addr += large_page_size;
+ }
+ break;
+
+ /*
+ * During dirty logging, KVM will only update attributes of the
+ * normal page mappings from RO to RW if memory backing src type
+ * is anonymous. In other cases, KVM will split the huge block
+ * mappings into normal page mappings if memory backing src type
+ * is THP or HUGETLB.
+ */
+ case KVM_UPDATE_MAPPINGS:
+ if (src_type == VM_MEM_SRC_ANONYMOUS) {
+ for (i = 0; i < host_num_pages; i++) {
+ *(uint64_t *)addr = 0x0123456789ABCDEF;
+ addr += host_page_size;
+ }
+ break;
+ }
+
+ for (i = 0; i < large_num_pages; i++) {
+ /*
+ * Write to the first host page in each large
+ * page region, and triger break of large pages.
+ */
+ *(uint64_t *)addr = 0x0123456789ABCDEF;
+
+ /*
+ * Access the middle host pages in each large
+ * page region. Since dirty logging is enabled,
+ * this will create new mappings at the smallest
+ * granularity.
+ */
+ addr += host_page_size * half;
+ for (j = half; j < host_pages_per_lpage; j++) {
+ READ_ONCE(*(uint64_t *)addr);
+ addr += host_page_size;
+ }
+ }
+ break;
+
+ /*
+ * After dirty logging is stopped, vCPUs concurrently read
+ * from every single host page. Then KVM will coalesce the
+ * split page mappings back to block mappings. And a TLB
+ * conflict abort could occur here if TLB entries of the
+ * page mappings are not fully invalidated.
+ */
+ case KVM_ADJUST_MAPPINGS:
+ for (i = 0; i < host_num_pages; i++) {
+ READ_ONCE(*(uint64_t *)addr);
+ addr += host_page_size;
+ }
+ break;
+
+ default:
+ break;
+ }
+
+ GUEST_SYNC(1);
+ }
+}
+
+static void *vcpu_worker(void *data)
+{
+ int ret;
+ struct perf_test_vcpu_args *vcpu_args = data;
+ struct kvm_vm *vm = perf_test_args.vm;
+ int vcpu_id = vcpu_args->vcpu_id;
+ struct kvm_run *run;
+ struct timespec start;
+ struct timespec ts_diff;
+ enum test_stage stage;
+
+ vcpu_args_set(vm, vcpu_id, 1, vcpu_id);
+ run = vcpu_state(vm, vcpu_id);
+
+ while (!READ_ONCE(host_quit)) {
+ clock_gettime(CLOCK_MONOTONIC_RAW, &start);
+ ret = _vcpu_run(vm, vcpu_id);
+ ts_diff = timespec_elapsed(start);
+
+ TEST_ASSERT(ret == 0, "vcpu_run failed: %d\n", ret);
+
+ TEST_ASSERT(get_ucall(vm, vcpu_id, NULL) == UCALL_SYNC,
+ "Invalid guest sync status: exit_reason=%s\n",
+ exit_reason_str(run->exit_reason));
+
+ pr_debug("Got sync event from vCPU %d\n", vcpu_id);
+ stage = READ_ONCE(*current_stage);
+ vcpu_last_completed_stage[vcpu_id] = stage;
+ pr_debug("vCPU %d has completed stage %s\n"
+ "execution time is: %ld.%.9lds\n\n",
+ vcpu_id, test_stage_string[stage],
+ ts_diff.tv_sec, ts_diff.tv_nsec);
+
+ while (stage == READ_ONCE(*current_stage) &&
+ !READ_ONCE(host_quit)) {}
+ }
+
+ return NULL;
+}
+
+struct test_params {
+ uint64_t phys_offset;
+ uint64_t test_mem_size;
+ enum vm_mem_backing_src_type src_type;
+};
+
+static struct kvm_vm *pre_init_before_test(enum vm_guest_mode mode, void *arg)
+{
+ struct test_params *p = arg;
+ struct perf_test_vcpu_args *vcpu_args;
+ enum vm_mem_backing_src_type src_type = p->src_type;
+ uint64_t large_page_size = get_backing_src_pagesz(src_type);
+ uint64_t test_mem_size = p->test_mem_size, guest_num_pages;
+ uint64_t guest_page_size = vm_guest_mode_params[mode].page_size;
+ uint64_t host_page_size = getpagesize();
+ uint64_t alignment;
+ void *host_test_mem;
+ struct kvm_vm *vm;
+ int vcpu_id;
+
+ /* Align up the test memory size */
+ alignment = max(large_page_size, guest_page_size);
+ test_mem_size = (test_mem_size + alignment - 1) & ~(alignment - 1);
+
+ /* Create a VM with enough guest pages */
+ guest_num_pages = test_mem_size / guest_page_size;
+ vm = vm_create_with_vcpus(mode, nr_vcpus,
+ guest_num_pages, 0, guest_code, NULL);
+
+ /* Align down GPA of the testing memslot */
+ if (!p->phys_offset)
+ guest_test_phys_mem = (vm_get_max_gfn(vm) - guest_num_pages) *
+ guest_page_size;
+ else
+ guest_test_phys_mem = p->phys_offset;
+#ifdef __s390x__
+ alignment = max(0x100000, alignment);
+#endif
+ guest_test_phys_mem &= ~(alignment - 1);
+
+ /* Set up the shared data structure perf_test_args */
+ perf_test_args.vm = vm;
+ perf_test_args.guest_test_virt_mem = guest_test_virt_mem;
+ perf_test_args.host_page_size = host_page_size;
+ perf_test_args.host_num_pages = test_mem_size / host_page_size;
+ perf_test_args.large_page_size = large_page_size;
+ perf_test_args.large_num_pages = test_mem_size / large_page_size;
+ perf_test_args.host_pages_per_lpage = large_page_size / host_page_size;
+ perf_test_args.src_type = src_type;
+
+ for (vcpu_id = 0; vcpu_id < KVM_MAX_VCPUS; vcpu_id++) {
+ vcpu_args = &perf_test_args.vcpu_args[vcpu_id];
+ vcpu_args->vcpu_id = vcpu_id;
+ vcpu_args->vcpu_write = !(vcpu_id % NUM_ACCESS_TYPES);
+
+ vcpu_last_completed_stage[vcpu_id] = NUM_TEST_STAGES;
+ }
+
+ /* Add an extra memory slot with specified backing src type */
+ vm_userspace_mem_region_add(vm, src_type, guest_test_phys_mem,
+ TEST_MEM_SLOT_INDEX, guest_num_pages, 0);
+
+ /* Do mapping(GVA->GPA) for the testing memory slot */
+ virt_map(vm, guest_test_virt_mem, guest_test_phys_mem, guest_num_pages, 0);
+
+ /* Cache the HVA pointer of the region */
+ host_test_mem = addr_gpa2hva(vm, (vm_paddr_t)guest_test_phys_mem);
+
+ /* Export shared structure perf_test_args to guest */
+ ucall_init(vm, NULL);
+ sync_global_to_guest(vm, perf_test_args);
+
+ current_stage = addr_gva2hva(vm, (vm_vaddr_t)(&guest_test_stage));
+ *current_stage = NUM_TEST_STAGES;
+
+ pr_info("Testing guest mode: %s\n", vm_guest_mode_string(mode));
+ pr_info("Testing memory backing src type: %s\n",
+ vm_mem_backing_src_alias(src_type)->name);
+ pr_info("Testing memory backing src granularity: 0x%lx\n",
+ large_page_size);
+ pr_info("Testing memory size(aligned): 0x%lx\n", test_mem_size);
+ pr_info("Guest physical test memory offset: 0x%lx\n",
+ guest_test_phys_mem);
+ pr_info("Host virtual test memory offset: 0x%lx\n",
+ (uint64_t)host_test_mem);
+ pr_info("Number of testing vCPUs: %d\n", nr_vcpus);
+
+ return vm;
+}
+
+static void run_test(enum vm_guest_mode mode, void *arg)
+{
+ pthread_t *vcpu_threads;
+ struct kvm_vm *vm;
+ int vcpu_id;
+ enum test_stage stage;
+ struct timespec start;
+ struct timespec ts_diff;
+
+ /* Create VM with vCPUs and make some pre-initialization */
+ vm = pre_init_before_test(mode, arg);
+
+ vcpu_threads = malloc(nr_vcpus * sizeof(*vcpu_threads));
+ TEST_ASSERT(vcpu_threads, "Memory allocation failed");
+
+ host_quit = false;
+ stage = KVM_BEFORE_MAPPINGS;
+ *current_stage = stage;
+
+ for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++) {
+ pthread_create(&vcpu_threads[vcpu_id], NULL, vcpu_worker,
+ &perf_test_args.vcpu_args[vcpu_id]);
+ }
+ for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++) {
+ while (READ_ONCE(vcpu_last_completed_stage[vcpu_id]) != stage)
+ pr_debug("Waiting for vCPU %d to complete stage %s\n",
+ vcpu_id, test_stage_string[stage]);
+ }
+ pr_info("Started all vCPUs successfully\n");
+
+ /* Test the stage of KVM creating mappings */
+ clock_gettime(CLOCK_MONOTONIC_RAW, &start);
+ stage = KVM_CREATE_MAPPINGS;
+ *current_stage = stage;
+
+ for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++) {
+ while (READ_ONCE(vcpu_last_completed_stage[vcpu_id]) != stage)
+ pr_debug("Waiting for vCPU %d to complete stage %s\n",
+ vcpu_id, test_stage_string[stage]);
+ }
+
+ ts_diff = timespec_elapsed(start);
+ pr_info("KVM_CREATE_MAPPINGS: total execution time: %ld.%.9lds\n\n",
+ ts_diff.tv_sec, ts_diff.tv_nsec);
+
+ /* Test the stage of KVM updating mappings */
+ vm_mem_region_set_flags(vm, TEST_MEM_SLOT_INDEX,
+ KVM_MEM_LOG_DIRTY_PAGES);
+
+ clock_gettime(CLOCK_MONOTONIC_RAW, &start);
+ stage = KVM_UPDATE_MAPPINGS;
+ *current_stage = stage;
+
+ for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++) {
+ while (READ_ONCE(vcpu_last_completed_stage[vcpu_id]) != stage)
+ pr_debug("Waiting for vCPU %d to complete stage %s\n",
+ vcpu_id, test_stage_string[stage]);
+ }
+
+ ts_diff = timespec_elapsed(start);
+ pr_info("KVM_UPDATE_MAPPINGS: total execution time: %ld.%.9lds\n\n",
+ ts_diff.tv_sec, ts_diff.tv_nsec);
+
+ /* Test the stage of KVM adjusting mappings */
+ vm_mem_region_set_flags(vm, TEST_MEM_SLOT_INDEX, 0);
+
+ clock_gettime(CLOCK_MONOTONIC_RAW, &start);
+ stage = KVM_ADJUST_MAPPINGS;
+ *current_stage = stage;
+
+ for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++) {
+ while (READ_ONCE(vcpu_last_completed_stage[vcpu_id]) != stage)
+ pr_debug("Waiting for vCPU %d to complete stage %s\n",
+ vcpu_id, test_stage_string[stage]);
+ }
+
+ ts_diff = timespec_elapsed(start);
+ pr_info("KVM_ADJUST_MAPPINGS: total execution time: %ld.%.9lds\n\n",
+ ts_diff.tv_sec, ts_diff.tv_nsec);
+
+ /* Tell the vcpu thread to quit */
+ host_quit = true;
+ for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++)
+ pthread_join(vcpu_threads[vcpu_id], NULL);
+
+ free(vcpu_threads);
+ ucall_uninit(vm);
+ kvm_vm_free(vm);
+}
+
+static void help(char *name)
+{
+ puts("");
+ printf("usage: %s [-h] [-p offset] [-m mode] "
+ "[-b mem size] [-v vcpus] [-s mem type]\n", name);
+ puts("");
+ printf(" -p: specify guest physical test memory offset\n"
+ " Warning: a low offset can conflict with the loaded test code.\n");
+ guest_modes_help();
+ printf(" -b: specify size of the memory region for testing. e.g. 10M or 3G.\n"
+ " (default: 1G)\n");
+ printf(" -v: specify the number of vCPUs to run\n"
+ " (default: 1)\n");
+ printf(" -s: specify the type of memory that should be used to\n"
+ " back the guest data region.\n"
+ " (default: anonymous)\n\n");
+ backing_src_help();
+ puts("");
+ exit(0);
+}
+
+int main(int argc, char *argv[])
+{
+ int max_vcpus = kvm_check_cap(KVM_CAP_MAX_VCPUS);
+ struct test_params p = {
+ .test_mem_size = DEFAULT_TEST_MEM_SIZE,
+ .src_type = VM_MEM_SRC_ANONYMOUS,
+ };
+ int opt;
+
+ guest_modes_append_default();
+
+ while ((opt = getopt(argc, argv, "hp:m:b:v:s:")) != -1) {
+ switch (opt) {
+ case 'p':
+ p.phys_offset = strtoull(optarg, NULL, 0);
+ break;
+ case 'm':
+ guest_modes_cmdline(optarg);
+ break;
+ case 'b':
+ p.test_mem_size = parse_size(optarg);
+ break;
+ case 'v':
+ nr_vcpus = atoi(optarg);
+ TEST_ASSERT(nr_vcpus > 0 && nr_vcpus <= max_vcpus,
+ "Invalid number of vcpus, must be between 1 and %d", max_vcpus);
+ break;
+ case 's':
+ p.src_type = parse_backing_src_type(optarg);
+ break;
+ case 'h':
+ default:
+ help(argv[0]);
+ break;
+ }
+ }
+
+ for_each_guest_mode(run_test, &p);
+
+ return 0;
+}
--
2.23.0
This patch syncs contents of tools/include/asm-generic/hugetlb_encode.h
and include/uapi/asm-generic/hugetlb_encode.h. Arch powerpc supports 16KB
hugepages and ARM64 supports 32MB/512MB hugepages. The corresponding mmap
flags have already been added in include/uapi/asm-generic/hugetlb_encode.h,
but not tools/include/asm-generic/hugetlb_encode.h.
Cc: Ingo Molnar <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Signed-off-by: Yanan Wang <[email protected]>
---
tools/include/asm-generic/hugetlb_encode.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/tools/include/asm-generic/hugetlb_encode.h b/tools/include/asm-generic/hugetlb_encode.h
index e4732d3c2998..4f3d5aaa11f5 100644
--- a/tools/include/asm-generic/hugetlb_encode.h
+++ b/tools/include/asm-generic/hugetlb_encode.h
@@ -20,13 +20,16 @@
#define HUGETLB_FLAG_ENCODE_SHIFT 26
#define HUGETLB_FLAG_ENCODE_MASK 0x3f
+#define HUGETLB_FLAG_ENCODE_16KB (14 << HUGETLB_FLAG_ENCODE_SHIFT)
#define HUGETLB_FLAG_ENCODE_64KB (16 << HUGETLB_FLAG_ENCODE_SHIFT)
#define HUGETLB_FLAG_ENCODE_512KB (19 << HUGETLB_FLAG_ENCODE_SHIFT)
#define HUGETLB_FLAG_ENCODE_1MB (20 << HUGETLB_FLAG_ENCODE_SHIFT)
#define HUGETLB_FLAG_ENCODE_2MB (21 << HUGETLB_FLAG_ENCODE_SHIFT)
#define HUGETLB_FLAG_ENCODE_8MB (23 << HUGETLB_FLAG_ENCODE_SHIFT)
#define HUGETLB_FLAG_ENCODE_16MB (24 << HUGETLB_FLAG_ENCODE_SHIFT)
+#define HUGETLB_FLAG_ENCODE_32MB (25 << HUGETLB_FLAG_ENCODE_SHIFT)
#define HUGETLB_FLAG_ENCODE_256MB (28 << HUGETLB_FLAG_ENCODE_SHIFT)
+#define HUGETLB_FLAG_ENCODE_512MB (29 << HUGETLB_FLAG_ENCODE_SHIFT)
#define HUGETLB_FLAG_ENCODE_1GB (30 << HUGETLB_FLAG_ENCODE_SHIFT)
#define HUGETLB_FLAG_ENCODE_2GB (31 << HUGETLB_FLAG_ENCODE_SHIFT)
#define HUGETLB_FLAG_ENCODE_16GB (34 << HUGETLB_FLAG_ENCODE_SHIFT)
--
2.23.0
With VM_MEM_SRC_ANONYMOUS_HUGETLB, we currently can only use system
default hugetlb pages to back the testing guest memory. In order to
add flexibility, now list all the known hugetlb backing src types with
different page sizes, so that we can specify use of hugetlb pages of the
exact granularity that we want. And as all the known hugetlb page sizes
are listed, it's appropriate for all architectures.
Besides, the helper get_backing_src_pagesz() is added to get the
granularity of different backing src types(anonumous, thp, hugetlb).
Suggested-by: Ben Gardon <[email protected]>
Signed-off-by: Yanan Wang <[email protected]>
---
.../testing/selftests/kvm/include/test_util.h | 19 ++++++-
tools/testing/selftests/kvm/lib/kvm_util.c | 2 +-
tools/testing/selftests/kvm/lib/test_util.c | 56 +++++++++++++++----
3 files changed, 63 insertions(+), 14 deletions(-)
diff --git a/tools/testing/selftests/kvm/include/test_util.h b/tools/testing/selftests/kvm/include/test_util.h
index ef24c76ba89a..be5d08bcdca7 100644
--- a/tools/testing/selftests/kvm/include/test_util.h
+++ b/tools/testing/selftests/kvm/include/test_util.h
@@ -70,16 +70,31 @@ struct timespec timespec_div(struct timespec ts, int divisor);
enum vm_mem_backing_src_type {
VM_MEM_SRC_ANONYMOUS,
VM_MEM_SRC_ANONYMOUS_THP,
- VM_MEM_SRC_ANONYMOUS_HUGETLB,
+ VM_MEM_SRC_ANONYMOUS_HUGETLB_16KB,
+ VM_MEM_SRC_ANONYMOUS_HUGETLB_64KB,
+ VM_MEM_SRC_ANONYMOUS_HUGETLB_512KB,
+ VM_MEM_SRC_ANONYMOUS_HUGETLB_1MB,
+ VM_MEM_SRC_ANONYMOUS_HUGETLB_2MB,
+ VM_MEM_SRC_ANONYMOUS_HUGETLB_8MB,
+ VM_MEM_SRC_ANONYMOUS_HUGETLB_16MB,
+ VM_MEM_SRC_ANONYMOUS_HUGETLB_32MB,
+ VM_MEM_SRC_ANONYMOUS_HUGETLB_256MB,
+ VM_MEM_SRC_ANONYMOUS_HUGETLB_512MB,
+ VM_MEM_SRC_ANONYMOUS_HUGETLB_1GB,
+ VM_MEM_SRC_ANONYMOUS_HUGETLB_2GB,
+ VM_MEM_SRC_ANONYMOUS_HUGETLB_16GB,
+ NUM_SRC_TYPES,
};
struct vm_mem_backing_src_alias {
const char *name;
- enum vm_mem_backing_src_type type;
+ uint32_t flag;
};
bool thp_configured(void);
size_t get_trans_hugepagesz(void);
+const struct vm_mem_backing_src_alias *vm_mem_backing_src_alias(uint32_t i);
+size_t get_backing_src_pagesz(uint32_t i);
void backing_src_help(void);
enum vm_mem_backing_src_type parse_backing_src_type(const char *type_name);
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index cc22c4ab7d67..b91c8e3a7ee1 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -757,7 +757,7 @@ 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
- | (src_type == VM_MEM_SRC_ANONYMOUS_HUGETLB ? MAP_HUGETLB : 0),
+ | 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 f2d133f76c67..1f5e7241c80e 100644
--- a/tools/testing/selftests/kvm/lib/test_util.c
+++ b/tools/testing/selftests/kvm/lib/test_util.c
@@ -11,6 +11,7 @@
#include <stdlib.h>
#include <time.h>
#include <sys/stat.h>
+#include <linux/mman.h>
#include "linux/kernel.h"
#include "test_util.h"
@@ -112,12 +113,6 @@ void print_skip(const char *fmt, ...)
puts(", skipping test");
}
-const struct vm_mem_backing_src_alias backing_src_aliases[] = {
- {"anonymous", VM_MEM_SRC_ANONYMOUS,},
- {"anonymous_thp", VM_MEM_SRC_ANONYMOUS_THP,},
- {"anonymous_hugetlb", VM_MEM_SRC_ANONYMOUS_HUGETLB,},
-};
-
bool thp_configured(void)
{
int ret;
@@ -153,22 +148,61 @@ size_t get_trans_hugepagesz(void)
return size;
}
+const struct vm_mem_backing_src_alias *vm_mem_backing_src_alias(uint32_t i)
+{
+ static const struct vm_mem_backing_src_alias aliases[] = {
+ { "anonymous", 0 },
+ { "anonymous_thp", 0 },
+ { "anonymous_hugetlb_16kb", MAP_HUGETLB | MAP_HUGE_16KB },
+ { "anonymous_hugetlb_64kb", MAP_HUGETLB | MAP_HUGE_64KB },
+ { "anonymous_hugetlb_512kb", MAP_HUGETLB | MAP_HUGE_512KB },
+ { "anonymous_hugetlb_1mb", MAP_HUGETLB | MAP_HUGE_1MB },
+ { "anonymous_hugetlb_2mb", MAP_HUGETLB | MAP_HUGE_2MB },
+ { "anonymous_hugetlb_8mb", MAP_HUGETLB | MAP_HUGE_8MB },
+ { "anonymous_hugetlb_16mb", MAP_HUGETLB | MAP_HUGE_16MB },
+ { "anonymous_hugetlb_32mb", MAP_HUGETLB | MAP_HUGE_32MB },
+ { "anonymous_hugetlb_256mb", MAP_HUGETLB | MAP_HUGE_256MB },
+ { "anonymous_hugetlb_512mb", MAP_HUGETLB | MAP_HUGE_512MB },
+ { "anonymous_hugetlb_1gb", MAP_HUGETLB | MAP_HUGE_1GB },
+ { "anonymous_hugetlb_2gb", MAP_HUGETLB | MAP_HUGE_2GB },
+ { "anonymous_hugetlb_16gb", MAP_HUGETLB | MAP_HUGE_16GB },
+ };
+ _Static_assert(ARRAY_SIZE(aliases) == NUM_SRC_TYPES,
+ "Missing new backing src types?");
+
+ TEST_ASSERT(i < NUM_SRC_TYPES, "Backing src type ID %d too big", i);
+
+ return &aliases[i];
+}
+
+size_t get_backing_src_pagesz(uint32_t i)
+{
+ uint32_t flag = vm_mem_backing_src_alias(i)->flag;
+
+ if (i == VM_MEM_SRC_ANONYMOUS)
+ return getpagesize();
+ if (i == VM_MEM_SRC_ANONYMOUS_THP)
+ return get_trans_hugepagesz();
+
+ return MAP_HUGE_PAGE_SIZE(flag);
+}
+
void backing_src_help(void)
{
int i;
printf("Available backing src types:\n");
- for (i = 0; i < ARRAY_SIZE(backing_src_aliases); i++)
- printf("\t%s\n", backing_src_aliases[i].name);
+ for (i = 0; i < NUM_SRC_TYPES; i++)
+ printf("\t%s\n", vm_mem_backing_src_alias(i)->name);
}
enum vm_mem_backing_src_type parse_backing_src_type(const char *type_name)
{
int i;
- for (i = 0; i < ARRAY_SIZE(backing_src_aliases); i++)
- if (!strcmp(type_name, backing_src_aliases[i].name))
- return backing_src_aliases[i].type;
+ for (i = 0; i < NUM_SRC_TYPES; i++)
+ if (!strcmp(type_name, vm_mem_backing_src_alias(i)->name))
+ return i;
backing_src_help();
TEST_FAIL("Unknown backing src type: %s", type_name);
--
2.23.0
On Sun, Feb 28, 2021 at 11:00 PM Yanan Wang <[email protected]> wrote:
>
> With VM_MEM_SRC_ANONYMOUS_HUGETLB, we currently can only use system
> default hugetlb pages to back the testing guest memory. In order to
> add flexibility, now list all the known hugetlb backing src types with
> different page sizes, so that we can specify use of hugetlb pages of the
> exact granularity that we want. And as all the known hugetlb page sizes
> are listed, it's appropriate for all architectures.
>
> Besides, the helper get_backing_src_pagesz() is added to get the
> granularity of different backing src types(anonumous, thp, hugetlb).
>
> Suggested-by: Ben Gardon <[email protected]>
> Signed-off-by: Yanan Wang <[email protected]>
> ---
> .../testing/selftests/kvm/include/test_util.h | 19 ++++++-
> tools/testing/selftests/kvm/lib/kvm_util.c | 2 +-
> tools/testing/selftests/kvm/lib/test_util.c | 56 +++++++++++++++----
> 3 files changed, 63 insertions(+), 14 deletions(-)
>
> diff --git a/tools/testing/selftests/kvm/include/test_util.h b/tools/testing/selftests/kvm/include/test_util.h
> index ef24c76ba89a..be5d08bcdca7 100644
> --- a/tools/testing/selftests/kvm/include/test_util.h
> +++ b/tools/testing/selftests/kvm/include/test_util.h
> @@ -70,16 +70,31 @@ struct timespec timespec_div(struct timespec ts, int divisor);
> enum vm_mem_backing_src_type {
> VM_MEM_SRC_ANONYMOUS,
> VM_MEM_SRC_ANONYMOUS_THP,
> - VM_MEM_SRC_ANONYMOUS_HUGETLB,
I apologize I didn't catch this in v2, but it looks like this patch
removes a default hugetlb size option. I could see this being
intentional if we want to force developers to think about there being
multiple page sizes, but it might also be nice for folks to have an
option to use the system default hugepage size.
Otherwise, this series looks good to me. Please feel free to add
Reviewed-by: Ben Gardon <[email protected]>.
> + VM_MEM_SRC_ANONYMOUS_HUGETLB_16KB,
> + VM_MEM_SRC_ANONYMOUS_HUGETLB_64KB,
> + VM_MEM_SRC_ANONYMOUS_HUGETLB_512KB,
> + VM_MEM_SRC_ANONYMOUS_HUGETLB_1MB,
> + VM_MEM_SRC_ANONYMOUS_HUGETLB_2MB,
> + VM_MEM_SRC_ANONYMOUS_HUGETLB_8MB,
> + VM_MEM_SRC_ANONYMOUS_HUGETLB_16MB,
> + VM_MEM_SRC_ANONYMOUS_HUGETLB_32MB,
> + VM_MEM_SRC_ANONYMOUS_HUGETLB_256MB,
> + VM_MEM_SRC_ANONYMOUS_HUGETLB_512MB,
> + VM_MEM_SRC_ANONYMOUS_HUGETLB_1GB,
> + VM_MEM_SRC_ANONYMOUS_HUGETLB_2GB,
> + VM_MEM_SRC_ANONYMOUS_HUGETLB_16GB,
> + NUM_SRC_TYPES,
> };
>
> struct vm_mem_backing_src_alias {
> const char *name;
> - enum vm_mem_backing_src_type type;
> + uint32_t flag;
> };
>
> bool thp_configured(void);
> size_t get_trans_hugepagesz(void);
> +const struct vm_mem_backing_src_alias *vm_mem_backing_src_alias(uint32_t i);
> +size_t get_backing_src_pagesz(uint32_t i);
> void backing_src_help(void);
> enum vm_mem_backing_src_type parse_backing_src_type(const char *type_name);
>
> diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
> index cc22c4ab7d67..b91c8e3a7ee1 100644
> --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> @@ -757,7 +757,7 @@ 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
> - | (src_type == VM_MEM_SRC_ANONYMOUS_HUGETLB ? MAP_HUGETLB : 0),
> + | 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 f2d133f76c67..1f5e7241c80e 100644
> --- a/tools/testing/selftests/kvm/lib/test_util.c
> +++ b/tools/testing/selftests/kvm/lib/test_util.c
> @@ -11,6 +11,7 @@
> #include <stdlib.h>
> #include <time.h>
> #include <sys/stat.h>
> +#include <linux/mman.h>
> #include "linux/kernel.h"
>
> #include "test_util.h"
> @@ -112,12 +113,6 @@ void print_skip(const char *fmt, ...)
> puts(", skipping test");
> }
>
> -const struct vm_mem_backing_src_alias backing_src_aliases[] = {
> - {"anonymous", VM_MEM_SRC_ANONYMOUS,},
> - {"anonymous_thp", VM_MEM_SRC_ANONYMOUS_THP,},
> - {"anonymous_hugetlb", VM_MEM_SRC_ANONYMOUS_HUGETLB,},
> -};
> -
> bool thp_configured(void)
> {
> int ret;
> @@ -153,22 +148,61 @@ size_t get_trans_hugepagesz(void)
> return size;
> }
>
> +const struct vm_mem_backing_src_alias *vm_mem_backing_src_alias(uint32_t i)
> +{
> + static const struct vm_mem_backing_src_alias aliases[] = {
> + { "anonymous", 0 },
> + { "anonymous_thp", 0 },
> + { "anonymous_hugetlb_16kb", MAP_HUGETLB | MAP_HUGE_16KB },
> + { "anonymous_hugetlb_64kb", MAP_HUGETLB | MAP_HUGE_64KB },
> + { "anonymous_hugetlb_512kb", MAP_HUGETLB | MAP_HUGE_512KB },
> + { "anonymous_hugetlb_1mb", MAP_HUGETLB | MAP_HUGE_1MB },
> + { "anonymous_hugetlb_2mb", MAP_HUGETLB | MAP_HUGE_2MB },
> + { "anonymous_hugetlb_8mb", MAP_HUGETLB | MAP_HUGE_8MB },
> + { "anonymous_hugetlb_16mb", MAP_HUGETLB | MAP_HUGE_16MB },
> + { "anonymous_hugetlb_32mb", MAP_HUGETLB | MAP_HUGE_32MB },
> + { "anonymous_hugetlb_256mb", MAP_HUGETLB | MAP_HUGE_256MB },
> + { "anonymous_hugetlb_512mb", MAP_HUGETLB | MAP_HUGE_512MB },
> + { "anonymous_hugetlb_1gb", MAP_HUGETLB | MAP_HUGE_1GB },
> + { "anonymous_hugetlb_2gb", MAP_HUGETLB | MAP_HUGE_2GB },
> + { "anonymous_hugetlb_16gb", MAP_HUGETLB | MAP_HUGE_16GB },
> + };
> + _Static_assert(ARRAY_SIZE(aliases) == NUM_SRC_TYPES,
> + "Missing new backing src types?");
> +
> + TEST_ASSERT(i < NUM_SRC_TYPES, "Backing src type ID %d too big", i);
> +
> + return &aliases[i];
> +}
> +
> +size_t get_backing_src_pagesz(uint32_t i)
> +{
> + uint32_t flag = vm_mem_backing_src_alias(i)->flag;
> +
> + if (i == VM_MEM_SRC_ANONYMOUS)
> + return getpagesize();
> + if (i == VM_MEM_SRC_ANONYMOUS_THP)
> + return get_trans_hugepagesz();
> +
> + return MAP_HUGE_PAGE_SIZE(flag);
> +}
> +
> void backing_src_help(void)
> {
> int i;
>
> printf("Available backing src types:\n");
> - for (i = 0; i < ARRAY_SIZE(backing_src_aliases); i++)
> - printf("\t%s\n", backing_src_aliases[i].name);
> + for (i = 0; i < NUM_SRC_TYPES; i++)
> + printf("\t%s\n", vm_mem_backing_src_alias(i)->name);
> }
>
> enum vm_mem_backing_src_type parse_backing_src_type(const char *type_name)
> {
> int i;
>
> - for (i = 0; i < ARRAY_SIZE(backing_src_aliases); i++)
> - if (!strcmp(type_name, backing_src_aliases[i].name))
> - return backing_src_aliases[i].type;
> + for (i = 0; i < NUM_SRC_TYPES; i++)
> + if (!strcmp(type_name, vm_mem_backing_src_alias(i)->name))
> + return i;
>
> backing_src_help();
> TEST_FAIL("Unknown backing src type: %s", type_name);
> --
> 2.23.0
>
Hi Ben,
On 2021/3/2 1:09, Ben Gardon wrote:
> On Sun, Feb 28, 2021 at 11:00 PM Yanan Wang <[email protected]> wrote:
>> With VM_MEM_SRC_ANONYMOUS_HUGETLB, we currently can only use system
>> default hugetlb pages to back the testing guest memory. In order to
>> add flexibility, now list all the known hugetlb backing src types with
>> different page sizes, so that we can specify use of hugetlb pages of the
>> exact granularity that we want. And as all the known hugetlb page sizes
>> are listed, it's appropriate for all architectures.
>>
>> Besides, the helper get_backing_src_pagesz() is added to get the
>> granularity of different backing src types(anonumous, thp, hugetlb).
>>
>> Suggested-by: Ben Gardon <[email protected]>
>> Signed-off-by: Yanan Wang <[email protected]>
>> ---
>> .../testing/selftests/kvm/include/test_util.h | 19 ++++++-
>> tools/testing/selftests/kvm/lib/kvm_util.c | 2 +-
>> tools/testing/selftests/kvm/lib/test_util.c | 56 +++++++++++++++----
>> 3 files changed, 63 insertions(+), 14 deletions(-)
>>
>> diff --git a/tools/testing/selftests/kvm/include/test_util.h b/tools/testing/selftests/kvm/include/test_util.h
>> index ef24c76ba89a..be5d08bcdca7 100644
>> --- a/tools/testing/selftests/kvm/include/test_util.h
>> +++ b/tools/testing/selftests/kvm/include/test_util.h
>> @@ -70,16 +70,31 @@ struct timespec timespec_div(struct timespec ts, int divisor);
>> enum vm_mem_backing_src_type {
>> VM_MEM_SRC_ANONYMOUS,
>> VM_MEM_SRC_ANONYMOUS_THP,
>> - VM_MEM_SRC_ANONYMOUS_HUGETLB,
> I apologize I didn't catch this in v2, but it looks like this patch
> removes a default hugetlb size option. I could see this being
> intentional if we want to force developers to think about there being
> multiple page sizes, but it might also be nice for folks to have an
> option to use the system default hugepage size.
Thanks for pointing out this. I was trying to let developers to use the
accurate
page size in all cases if they want to use hugetlb pages, so I removed
the default
enum of VM_MEM_SRC_ANONYMOUS_HUGETLB. But maybe it's not right to do so.
It's possible that a program just wants to use hugetlb pages and doesn't
really care
the page size and the default option is the best in this case. Anyway, I
will add
VM_MEM_SRC_ANONYMOUS_HUGETLB in next version :). As for the default hugetlb
page size, it can be got by reading file /proc/meminfo.
> Otherwise, this series looks good to me. Please feel free to add
> Reviewed-by: Ben Gardon <[email protected]>.
Thanks for your review of this series and the good suggestions,
Yanan
>> + VM_MEM_SRC_ANONYMOUS_HUGETLB_16KB,
>> + VM_MEM_SRC_ANONYMOUS_HUGETLB_64KB,
>> + VM_MEM_SRC_ANONYMOUS_HUGETLB_512KB,
>> + VM_MEM_SRC_ANONYMOUS_HUGETLB_1MB,
>> + VM_MEM_SRC_ANONYMOUS_HUGETLB_2MB,
>> + VM_MEM_SRC_ANONYMOUS_HUGETLB_8MB,
>> + VM_MEM_SRC_ANONYMOUS_HUGETLB_16MB,
>> + VM_MEM_SRC_ANONYMOUS_HUGETLB_32MB,
>> + VM_MEM_SRC_ANONYMOUS_HUGETLB_256MB,
>> + VM_MEM_SRC_ANONYMOUS_HUGETLB_512MB,
>> + VM_MEM_SRC_ANONYMOUS_HUGETLB_1GB,
>> + VM_MEM_SRC_ANONYMOUS_HUGETLB_2GB,
>> + VM_MEM_SRC_ANONYMOUS_HUGETLB_16GB,
>> + NUM_SRC_TYPES,
>> };
>>
>> struct vm_mem_backing_src_alias {
>> const char *name;
>> - enum vm_mem_backing_src_type type;
>> + uint32_t flag;
>> };
>>
>> bool thp_configured(void);
>> size_t get_trans_hugepagesz(void);
>> +const struct vm_mem_backing_src_alias *vm_mem_backing_src_alias(uint32_t i);
>> +size_t get_backing_src_pagesz(uint32_t i);
>> void backing_src_help(void);
>> enum vm_mem_backing_src_type parse_backing_src_type(const char *type_name);
>>
>> diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
>> index cc22c4ab7d67..b91c8e3a7ee1 100644
>> --- a/tools/testing/selftests/kvm/lib/kvm_util.c
>> +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
>> @@ -757,7 +757,7 @@ 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
>> - | (src_type == VM_MEM_SRC_ANONYMOUS_HUGETLB ? MAP_HUGETLB : 0),
>> + | 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 f2d133f76c67..1f5e7241c80e 100644
>> --- a/tools/testing/selftests/kvm/lib/test_util.c
>> +++ b/tools/testing/selftests/kvm/lib/test_util.c
>> @@ -11,6 +11,7 @@
>> #include <stdlib.h>
>> #include <time.h>
>> #include <sys/stat.h>
>> +#include <linux/mman.h>
>> #include "linux/kernel.h"
>>
>> #include "test_util.h"
>> @@ -112,12 +113,6 @@ void print_skip(const char *fmt, ...)
>> puts(", skipping test");
>> }
>>
>> -const struct vm_mem_backing_src_alias backing_src_aliases[] = {
>> - {"anonymous", VM_MEM_SRC_ANONYMOUS,},
>> - {"anonymous_thp", VM_MEM_SRC_ANONYMOUS_THP,},
>> - {"anonymous_hugetlb", VM_MEM_SRC_ANONYMOUS_HUGETLB,},
>> -};
>> -
>> bool thp_configured(void)
>> {
>> int ret;
>> @@ -153,22 +148,61 @@ size_t get_trans_hugepagesz(void)
>> return size;
>> }
>>
>> +const struct vm_mem_backing_src_alias *vm_mem_backing_src_alias(uint32_t i)
>> +{
>> + static const struct vm_mem_backing_src_alias aliases[] = {
>> + { "anonymous", 0 },
>> + { "anonymous_thp", 0 },
>> + { "anonymous_hugetlb_16kb", MAP_HUGETLB | MAP_HUGE_16KB },
>> + { "anonymous_hugetlb_64kb", MAP_HUGETLB | MAP_HUGE_64KB },
>> + { "anonymous_hugetlb_512kb", MAP_HUGETLB | MAP_HUGE_512KB },
>> + { "anonymous_hugetlb_1mb", MAP_HUGETLB | MAP_HUGE_1MB },
>> + { "anonymous_hugetlb_2mb", MAP_HUGETLB | MAP_HUGE_2MB },
>> + { "anonymous_hugetlb_8mb", MAP_HUGETLB | MAP_HUGE_8MB },
>> + { "anonymous_hugetlb_16mb", MAP_HUGETLB | MAP_HUGE_16MB },
>> + { "anonymous_hugetlb_32mb", MAP_HUGETLB | MAP_HUGE_32MB },
>> + { "anonymous_hugetlb_256mb", MAP_HUGETLB | MAP_HUGE_256MB },
>> + { "anonymous_hugetlb_512mb", MAP_HUGETLB | MAP_HUGE_512MB },
>> + { "anonymous_hugetlb_1gb", MAP_HUGETLB | MAP_HUGE_1GB },
>> + { "anonymous_hugetlb_2gb", MAP_HUGETLB | MAP_HUGE_2GB },
>> + { "anonymous_hugetlb_16gb", MAP_HUGETLB | MAP_HUGE_16GB },
>> + };
>> + _Static_assert(ARRAY_SIZE(aliases) == NUM_SRC_TYPES,
>> + "Missing new backing src types?");
>> +
>> + TEST_ASSERT(i < NUM_SRC_TYPES, "Backing src type ID %d too big", i);
>> +
>> + return &aliases[i];
>> +}
>> +
>> +size_t get_backing_src_pagesz(uint32_t i)
>> +{
>> + uint32_t flag = vm_mem_backing_src_alias(i)->flag;
>> +
>> + if (i == VM_MEM_SRC_ANONYMOUS)
>> + return getpagesize();
>> + if (i == VM_MEM_SRC_ANONYMOUS_THP)
>> + return get_trans_hugepagesz();
>> +
>> + return MAP_HUGE_PAGE_SIZE(flag);
>> +}
>> +
>> void backing_src_help(void)
>> {
>> int i;
>>
>> printf("Available backing src types:\n");
>> - for (i = 0; i < ARRAY_SIZE(backing_src_aliases); i++)
>> - printf("\t%s\n", backing_src_aliases[i].name);
>> + for (i = 0; i < NUM_SRC_TYPES; i++)
>> + printf("\t%s\n", vm_mem_backing_src_alias(i)->name);
>> }
>>
>> enum vm_mem_backing_src_type parse_backing_src_type(const char *type_name)
>> {
>> int i;
>>
>> - for (i = 0; i < ARRAY_SIZE(backing_src_aliases); i++)
>> - if (!strcmp(type_name, backing_src_aliases[i].name))
>> - return backing_src_aliases[i].type;
>> + for (i = 0; i < NUM_SRC_TYPES; i++)
>> + if (!strcmp(type_name, vm_mem_backing_src_alias(i)->name))
>> + return i;
>>
>> backing_src_help();
>> TEST_FAIL("Unknown backing src type: %s", type_name);
>> --
>> 2.23.0
>>
> .