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145 lines
4.1 KiB
145 lines
4.1 KiB
// 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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#include "kvm_util.h" |
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#include "perf_test_util.h" |
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#include "processor.h" |
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struct perf_test_args perf_test_args; |
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uint64_t guest_test_phys_mem; |
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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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/* |
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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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static void guest_code(uint32_t vcpu_id) |
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{ |
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struct perf_test_vcpu_args *vcpu_args = &perf_test_args.vcpu_args[vcpu_id]; |
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uint64_t gva; |
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uint64_t pages; |
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int i; |
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/* Make sure vCPU args data structure is not corrupt. */ |
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GUEST_ASSERT(vcpu_args->vcpu_id == vcpu_id); |
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gva = vcpu_args->gva; |
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pages = vcpu_args->pages; |
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while (true) { |
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for (i = 0; i < pages; i++) { |
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uint64_t addr = gva + (i * perf_test_args.guest_page_size); |
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if (i % perf_test_args.wr_fract == 0) |
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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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struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int vcpus, |
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uint64_t vcpu_memory_bytes, |
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enum vm_mem_backing_src_type backing_src) |
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{ |
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struct kvm_vm *vm; |
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uint64_t guest_num_pages; |
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pr_info("Testing guest mode: %s\n", vm_guest_mode_string(mode)); |
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perf_test_args.host_page_size = getpagesize(); |
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perf_test_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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(vcpus * vcpu_memory_bytes) / perf_test_args.guest_page_size); |
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TEST_ASSERT(vcpu_memory_bytes % perf_test_args.host_page_size == 0, |
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"Guest memory size is not host page size aligned."); |
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TEST_ASSERT(vcpu_memory_bytes % perf_test_args.guest_page_size == 0, |
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"Guest memory size is not guest page size aligned."); |
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vm = vm_create_with_vcpus(mode, vcpus, |
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(vcpus * vcpu_memory_bytes) / perf_test_args.guest_page_size, |
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0, guest_code, NULL); |
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perf_test_args.vm = vm; |
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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 < vm_get_max_gfn(vm), |
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"Requested more guest memory than address space allows.\n" |
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" guest pages: %lx max gfn: %x vcpus: %d wss: %lx]\n", |
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guest_num_pages, vm_get_max_gfn(vm), vcpus, |
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vcpu_memory_bytes); |
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guest_test_phys_mem = (vm_get_max_gfn(vm) - guest_num_pages) * |
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perf_test_args.guest_page_size; |
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guest_test_phys_mem &= ~(perf_test_args.host_page_size - 1); |
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#ifdef __s390x__ |
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/* Align to 1M (segment size) */ |
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guest_test_phys_mem &= ~((1 << 20) - 1); |
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#endif |
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pr_info("guest physical test memory offset: 0x%lx\n", guest_test_phys_mem); |
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/* Add an extra memory slot for testing */ |
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vm_userspace_mem_region_add(vm, backing_src, guest_test_phys_mem, |
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PERF_TEST_MEM_SLOT_INDEX, |
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guest_num_pages, 0); |
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/* Do mapping for the demand paging memory slot */ |
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virt_map(vm, guest_test_virt_mem, guest_test_phys_mem, guest_num_pages, 0); |
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ucall_init(vm, NULL); |
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return vm; |
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} |
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void perf_test_destroy_vm(struct kvm_vm *vm) |
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{ |
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ucall_uninit(vm); |
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kvm_vm_free(vm); |
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} |
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void perf_test_setup_vcpus(struct kvm_vm *vm, int 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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vm_paddr_t vcpu_gpa; |
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struct perf_test_vcpu_args *vcpu_args; |
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int vcpu_id; |
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for (vcpu_id = 0; vcpu_id < vcpus; vcpu_id++) { |
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vcpu_args = &perf_test_args.vcpu_args[vcpu_id]; |
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vcpu_args->vcpu_id = vcpu_id; |
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if (partition_vcpu_memory_access) { |
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vcpu_args->gva = guest_test_virt_mem + |
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(vcpu_id * vcpu_memory_bytes); |
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vcpu_args->pages = vcpu_memory_bytes / |
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perf_test_args.guest_page_size; |
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vcpu_gpa = guest_test_phys_mem + |
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(vcpu_id * 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 = (vcpus * vcpu_memory_bytes) / |
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perf_test_args.guest_page_size; |
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vcpu_gpa = guest_test_phys_mem; |
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} |
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pr_debug("Added VCPU %d with test mem gpa [%lx, %lx)\n", |
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vcpu_id, vcpu_gpa, vcpu_gpa + |
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(vcpu_args->pages * perf_test_args.guest_page_size)); |
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} |
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}
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