323 lines
8.7 KiB
C
323 lines
8.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020, Google LLC.
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*/
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#define _GNU_SOURCE
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#include <inttypes.h>
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#include "kvm_util.h"
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#include "memstress.h"
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#include "processor.h"
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struct memstress_args memstress_args;
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/*
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* Guest virtual memory offset of the testing memory slot.
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* Must not conflict with identity mapped test code.
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*/
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static uint64_t guest_test_virt_mem = DEFAULT_GUEST_TEST_MEM;
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struct vcpu_thread {
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/* The index of the vCPU. */
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int vcpu_idx;
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/* The pthread backing the vCPU. */
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pthread_t thread;
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/* Set to true once the vCPU thread is up and running. */
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bool running;
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};
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/* The vCPU threads involved in this test. */
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static struct vcpu_thread vcpu_threads[KVM_MAX_VCPUS];
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/* The function run by each vCPU thread, as provided by the test. */
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static void (*vcpu_thread_fn)(struct memstress_vcpu_args *);
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/* Set to true once all vCPU threads are up and running. */
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static bool all_vcpu_threads_running;
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static struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
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/*
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* Continuously write to the first 8 bytes of each page in the
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* specified region.
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*/
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void memstress_guest_code(uint32_t vcpu_idx)
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{
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struct memstress_args *args = &memstress_args;
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struct memstress_vcpu_args *vcpu_args = &args->vcpu_args[vcpu_idx];
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struct guest_random_state rand_state;
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uint64_t gva;
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uint64_t pages;
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uint64_t addr;
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uint64_t page;
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int i;
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rand_state = new_guest_random_state(args->random_seed + vcpu_idx);
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gva = vcpu_args->gva;
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pages = vcpu_args->pages;
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/* Make sure vCPU args data structure is not corrupt. */
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GUEST_ASSERT(vcpu_args->vcpu_idx == vcpu_idx);
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while (true) {
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for (i = 0; i < pages; i++) {
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if (args->random_access)
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page = guest_random_u32(&rand_state) % pages;
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else
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page = i;
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addr = gva + (page * args->guest_page_size);
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if (guest_random_u32(&rand_state) % 100 < args->write_percent)
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*(uint64_t *)addr = 0x0123456789ABCDEF;
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else
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READ_ONCE(*(uint64_t *)addr);
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}
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GUEST_SYNC(1);
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}
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}
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void memstress_setup_vcpus(struct kvm_vm *vm, int nr_vcpus,
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struct kvm_vcpu *vcpus[],
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uint64_t vcpu_memory_bytes,
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bool partition_vcpu_memory_access)
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{
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struct memstress_args *args = &memstress_args;
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struct memstress_vcpu_args *vcpu_args;
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int i;
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for (i = 0; i < nr_vcpus; i++) {
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vcpu_args = &args->vcpu_args[i];
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vcpu_args->vcpu = vcpus[i];
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vcpu_args->vcpu_idx = i;
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if (partition_vcpu_memory_access) {
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vcpu_args->gva = guest_test_virt_mem +
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(i * vcpu_memory_bytes);
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vcpu_args->pages = vcpu_memory_bytes /
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args->guest_page_size;
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vcpu_args->gpa = args->gpa + (i * vcpu_memory_bytes);
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} else {
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vcpu_args->gva = guest_test_virt_mem;
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vcpu_args->pages = (nr_vcpus * vcpu_memory_bytes) /
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args->guest_page_size;
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vcpu_args->gpa = args->gpa;
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}
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vcpu_args_set(vcpus[i], 1, i);
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pr_debug("Added VCPU %d with test mem gpa [%lx, %lx)\n",
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i, vcpu_args->gpa, vcpu_args->gpa +
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(vcpu_args->pages * args->guest_page_size));
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}
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}
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struct kvm_vm *memstress_create_vm(enum vm_guest_mode mode, int nr_vcpus,
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uint64_t vcpu_memory_bytes, int slots,
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enum vm_mem_backing_src_type backing_src,
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bool partition_vcpu_memory_access)
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{
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struct memstress_args *args = &memstress_args;
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struct kvm_vm *vm;
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uint64_t guest_num_pages, slot0_pages = 0;
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uint64_t backing_src_pagesz = get_backing_src_pagesz(backing_src);
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uint64_t region_end_gfn;
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int i;
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pr_info("Testing guest mode: %s\n", vm_guest_mode_string(mode));
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/* By default vCPUs will write to memory. */
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args->write_percent = 100;
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/*
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* Snapshot the non-huge page size. This is used by the guest code to
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* access/dirty pages at the logging granularity.
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*/
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args->guest_page_size = vm_guest_mode_params[mode].page_size;
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guest_num_pages = vm_adjust_num_guest_pages(mode,
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(nr_vcpus * vcpu_memory_bytes) / args->guest_page_size);
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TEST_ASSERT(vcpu_memory_bytes % getpagesize() == 0,
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"Guest memory size is not host page size aligned.");
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TEST_ASSERT(vcpu_memory_bytes % args->guest_page_size == 0,
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"Guest memory size is not guest page size aligned.");
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TEST_ASSERT(guest_num_pages % slots == 0,
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"Guest memory cannot be evenly divided into %d slots.",
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slots);
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/*
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* If using nested, allocate extra pages for the nested page tables and
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* in-memory data structures.
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*/
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if (args->nested)
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slot0_pages += memstress_nested_pages(nr_vcpus);
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/*
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* Pass guest_num_pages to populate the page tables for test memory.
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* The memory is also added to memslot 0, but that's a benign side
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* effect as KVM allows aliasing HVAs in meslots.
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*/
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vm = __vm_create_with_vcpus(mode, nr_vcpus, slot0_pages + guest_num_pages,
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memstress_guest_code, vcpus);
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args->vm = vm;
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/* Put the test region at the top guest physical memory. */
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region_end_gfn = vm->max_gfn + 1;
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#ifdef __x86_64__
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/*
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* When running vCPUs in L2, restrict the test region to 48 bits to
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* avoid needing 5-level page tables to identity map L2.
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*/
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if (args->nested)
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region_end_gfn = min(region_end_gfn, (1UL << 48) / args->guest_page_size);
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#endif
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/*
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* If there should be more memory in the guest test region than there
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* can be pages in the guest, it will definitely cause problems.
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*/
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TEST_ASSERT(guest_num_pages < region_end_gfn,
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"Requested more guest memory than address space allows.\n"
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" guest pages: %" PRIx64 " max gfn: %" PRIx64
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" nr_vcpus: %d wss: %" PRIx64 "]\n",
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guest_num_pages, region_end_gfn - 1, nr_vcpus, vcpu_memory_bytes);
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args->gpa = (region_end_gfn - guest_num_pages - 1) * args->guest_page_size;
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args->gpa = align_down(args->gpa, backing_src_pagesz);
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#ifdef __s390x__
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/* Align to 1M (segment size) */
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args->gpa = align_down(args->gpa, 1 << 20);
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#endif
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args->size = guest_num_pages * args->guest_page_size;
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pr_info("guest physical test memory: [0x%lx, 0x%lx)\n",
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args->gpa, args->gpa + args->size);
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/* Add extra memory slots for testing */
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for (i = 0; i < slots; i++) {
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uint64_t region_pages = guest_num_pages / slots;
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vm_paddr_t region_start = args->gpa + region_pages * args->guest_page_size * i;
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vm_userspace_mem_region_add(vm, backing_src, region_start,
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MEMSTRESS_MEM_SLOT_INDEX + i,
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region_pages, 0);
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}
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/* Do mapping for the demand paging memory slot */
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virt_map(vm, guest_test_virt_mem, args->gpa, guest_num_pages);
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memstress_setup_vcpus(vm, nr_vcpus, vcpus, vcpu_memory_bytes,
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partition_vcpu_memory_access);
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if (args->nested) {
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pr_info("Configuring vCPUs to run in L2 (nested).\n");
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memstress_setup_nested(vm, nr_vcpus, vcpus);
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}
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/* Export the shared variables to the guest. */
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sync_global_to_guest(vm, memstress_args);
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return vm;
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}
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void memstress_destroy_vm(struct kvm_vm *vm)
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{
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kvm_vm_free(vm);
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}
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void memstress_set_write_percent(struct kvm_vm *vm, uint32_t write_percent)
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{
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memstress_args.write_percent = write_percent;
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sync_global_to_guest(vm, memstress_args.write_percent);
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}
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void memstress_set_random_seed(struct kvm_vm *vm, uint32_t random_seed)
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{
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memstress_args.random_seed = random_seed;
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sync_global_to_guest(vm, memstress_args.random_seed);
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}
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void memstress_set_random_access(struct kvm_vm *vm, bool random_access)
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{
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memstress_args.random_access = random_access;
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sync_global_to_guest(vm, memstress_args.random_access);
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}
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uint64_t __weak memstress_nested_pages(int nr_vcpus)
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{
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return 0;
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}
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void __weak memstress_setup_nested(struct kvm_vm *vm, int nr_vcpus, struct kvm_vcpu **vcpus)
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{
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pr_info("%s() not support on this architecture, skipping.\n", __func__);
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exit(KSFT_SKIP);
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}
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static void *vcpu_thread_main(void *data)
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{
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struct vcpu_thread *vcpu = data;
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int vcpu_idx = vcpu->vcpu_idx;
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if (memstress_args.pin_vcpus)
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kvm_pin_this_task_to_pcpu(memstress_args.vcpu_to_pcpu[vcpu_idx]);
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WRITE_ONCE(vcpu->running, true);
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/*
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* Wait for all vCPU threads to be up and running before calling the test-
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* provided vCPU thread function. This prevents thread creation (which
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* requires taking the mmap_sem in write mode) from interfering with the
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* guest faulting in its memory.
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*/
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while (!READ_ONCE(all_vcpu_threads_running))
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;
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vcpu_thread_fn(&memstress_args.vcpu_args[vcpu_idx]);
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return NULL;
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}
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void memstress_start_vcpu_threads(int nr_vcpus,
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void (*vcpu_fn)(struct memstress_vcpu_args *))
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{
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int i;
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vcpu_thread_fn = vcpu_fn;
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WRITE_ONCE(all_vcpu_threads_running, false);
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WRITE_ONCE(memstress_args.stop_vcpus, false);
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for (i = 0; i < nr_vcpus; i++) {
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struct vcpu_thread *vcpu = &vcpu_threads[i];
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vcpu->vcpu_idx = i;
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WRITE_ONCE(vcpu->running, false);
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pthread_create(&vcpu->thread, NULL, vcpu_thread_main, vcpu);
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}
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for (i = 0; i < nr_vcpus; i++) {
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while (!READ_ONCE(vcpu_threads[i].running))
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;
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}
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WRITE_ONCE(all_vcpu_threads_running, true);
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}
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void memstress_join_vcpu_threads(int nr_vcpus)
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{
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int i;
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WRITE_ONCE(memstress_args.stop_vcpus, true);
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for (i = 0; i < nr_vcpus; i++)
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pthread_join(vcpu_threads[i].thread, NULL);
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}
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