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// SPDX-License-Identifier: GPL-2.0
/*
* tools/testing/selftests/kvm/include/perf_test_util.h
*
* Copyright (C) 2020, Google LLC.
*/
#ifndef SELFTEST_KVM_PERF_TEST_UTIL_H
#define SELFTEST_KVM_PERF_TEST_UTIL_H
#include "kvm_util.h"
#include "processor.h"
#define MAX_VCPUS 512
#define PAGE_SHIFT_4K 12
#define PTES_PER_4K_PT 512
#define TEST_MEM_SLOT_INDEX 1
/* Default guest test virtual memory offset */
#define DEFAULT_GUEST_TEST_MEM 0xc0000000
#define DEFAULT_PER_VCPU_MEM_SIZE (1 << 30) /* 1G */
/*
* 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 uint64_t guest_percpu_mem_size = DEFAULT_PER_VCPU_MEM_SIZE;
/* Number of VCPUs for the test */
static int nr_vcpus = 1;
struct vcpu_args {
uint64_t gva;
uint64_t pages;
/* Only used by the host userspace part of the vCPU thread */
int vcpu_id;
};
struct perf_test_args {
struct kvm_vm *vm;
uint64_t host_page_size;
uint64_t guest_page_size;
int wr_fract;
struct vcpu_args vcpu_args[MAX_VCPUS];
};
static struct perf_test_args perf_test_args;
/*
* Continuously write to the first 8 bytes of each page in the
* specified region.
*/
static void guest_code(uint32_t vcpu_id)
{
struct vcpu_args *vcpu_args = &perf_test_args.vcpu_args[vcpu_id];
uint64_t gva;
uint64_t pages;
int i;
/* Make sure vCPU args data structure is not corrupt. */
GUEST_ASSERT(vcpu_args->vcpu_id == vcpu_id);
gva = vcpu_args->gva;
pages = vcpu_args->pages;
while (true) {
for (i = 0; i < pages; i++) {
uint64_t addr = gva + (i * perf_test_args.guest_page_size);
if (i % perf_test_args.wr_fract == 0)
*(uint64_t *)addr = 0x0123456789ABCDEF;
else
READ_ONCE(*(uint64_t *)addr);
}
GUEST_SYNC(1);
}
}
static struct kvm_vm *create_vm(enum vm_guest_mode mode, int vcpus,
uint64_t vcpu_memory_bytes)
{
struct kvm_vm *vm;
uint64_t pages = DEFAULT_GUEST_PHY_PAGES;
uint64_t guest_num_pages;
/* Account for a few pages per-vCPU for stacks */
pages += DEFAULT_STACK_PGS * vcpus;
/*
* Reserve twice the ammount of memory needed to map the test region and
* the page table / stacks region, at 4k, for page tables. Do the
* calculation with 4K page size: the smallest of all archs. (e.g., 64K
* page size guest will need even less memory for page tables).
*/
pages += (2 * pages) / PTES_PER_4K_PT;
pages += ((2 * vcpus * vcpu_memory_bytes) >> PAGE_SHIFT_4K) /
PTES_PER_4K_PT;
pages = vm_adjust_num_guest_pages(mode, pages);
pr_info("Testing guest mode: %s\n", vm_guest_mode_string(mode));
vm = vm_create(mode, pages, O_RDWR);
kvm_vm_elf_load(vm, program_invocation_name, 0, 0);
#ifdef __x86_64__
vm_create_irqchip(vm);
#endif
perf_test_args.vm = vm;
perf_test_args.guest_page_size = vm_get_page_size(vm);
perf_test_args.host_page_size = getpagesize();
TEST_ASSERT(vcpu_memory_bytes % perf_test_args.guest_page_size == 0,
"Guest memory size is not guest page size aligned.");
guest_num_pages = (vcpus * vcpu_memory_bytes) /
perf_test_args.guest_page_size;
guest_num_pages = vm_adjust_num_guest_pages(mode, guest_num_pages);
/*
* If there should be more memory in the guest test region than there
* can be pages in the guest, it will definitely cause problems.
*/
TEST_ASSERT(guest_num_pages < vm_get_max_gfn(vm),
"Requested more guest memory than address space allows.\n"
" guest pages: %lx max gfn: %x vcpus: %d wss: %lx]\n",
guest_num_pages, vm_get_max_gfn(vm), vcpus,
vcpu_memory_bytes);
TEST_ASSERT(vcpu_memory_bytes % perf_test_args.host_page_size == 0,
"Guest memory size is not host page size aligned.");
guest_test_phys_mem = (vm_get_max_gfn(vm) - guest_num_pages) *
perf_test_args.guest_page_size;
guest_test_phys_mem &= ~(perf_test_args.host_page_size - 1);
#ifdef __s390x__
/* Align to 1M (segment size) */
guest_test_phys_mem &= ~((1 << 20) - 1);
#endif
pr_info("guest physical test memory offset: 0x%lx\n", guest_test_phys_mem);
/* Add an extra memory slot for testing */
vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS,
guest_test_phys_mem,
TEST_MEM_SLOT_INDEX,
guest_num_pages, 0);
/* Do mapping for the demand paging memory slot */
virt_map(vm, guest_test_virt_mem, guest_test_phys_mem, guest_num_pages, 0);
ucall_init(vm, NULL);
return vm;
}
static void add_vcpus(struct kvm_vm *vm, int vcpus, uint64_t vcpu_memory_bytes)
{
vm_paddr_t vcpu_gpa;
struct vcpu_args *vcpu_args;
int vcpu_id;
for (vcpu_id = 0; vcpu_id < vcpus; vcpu_id++) {
vcpu_args = &perf_test_args.vcpu_args[vcpu_id];
vm_vcpu_add_default(vm, vcpu_id, guest_code);
vcpu_args->vcpu_id = vcpu_id;
vcpu_args->gva = guest_test_virt_mem +
(vcpu_id * vcpu_memory_bytes);
vcpu_args->pages = vcpu_memory_bytes /
perf_test_args.guest_page_size;
vcpu_gpa = guest_test_phys_mem + (vcpu_id * vcpu_memory_bytes);
pr_debug("Added VCPU %d with test mem gpa [%lx, %lx)\n",
vcpu_id, vcpu_gpa, vcpu_gpa + vcpu_memory_bytes);
}
}
#endif /* SELFTEST_KVM_PERF_TEST_UTIL_H */
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