| /* |
| * Copyright 2018 Google LLC |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * https://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <assert.h> |
| #include <stdalign.h> |
| #include <stdint.h> |
| |
| #include "hf/arch/vm/power_mgmt.h" |
| |
| #include "hf/mm.h" |
| #include "hf/std.h" |
| |
| #include "vmapi/hf/call.h" |
| |
| #include "hftest.h" |
| |
| static alignas(PAGE_SIZE) uint8_t send_page[PAGE_SIZE]; |
| static alignas(PAGE_SIZE) uint8_t recv_page[PAGE_SIZE]; |
| static_assert(sizeof(send_page) == PAGE_SIZE, "Send page is not a page."); |
| static_assert(sizeof(recv_page) == PAGE_SIZE, "Recv page is not a page."); |
| |
| static hf_ipaddr_t send_page_addr = (hf_ipaddr_t)send_page; |
| static hf_ipaddr_t recv_page_addr = (hf_ipaddr_t)recv_page; |
| |
| #define STATE_VM_ID 1 |
| |
| /** |
| * Iterates trying to run vCPU of the secondary VM. Returns when a message |
| * of non-zero length is received. |
| */ |
| bool run_loop(void) |
| { |
| struct hf_vcpu_run_return run_res; |
| bool ok = false; |
| |
| for (;;) { |
| /* Run until it manages to schedule vCPU on this CPU. */ |
| do { |
| run_res = hf_vcpu_run(STATE_VM_ID, 0); |
| } while (run_res.code == HF_VCPU_RUN_WAIT_FOR_INTERRUPT); |
| |
| /* Break out if we received a message with non-zero length. */ |
| if (run_res.code == HF_VCPU_RUN_MESSAGE && |
| run_res.message.size != 0) { |
| break; |
| } |
| |
| /* Clear mailbox so that next message can be received. */ |
| hf_mailbox_clear(); |
| } |
| |
| /* Copies the contents of the received boolean to the return value. */ |
| if (run_res.message.size == sizeof(ok)) { |
| memcpy(&ok, recv_page, sizeof(ok)); |
| } |
| |
| hf_mailbox_clear(); |
| |
| return ok; |
| } |
| |
| /** |
| * This is the entry point of the additional primary VM vCPU. It just calls |
| * the run loop so that two cpus compete for the chance to run a secondary VM. |
| */ |
| static void vm_cpu_entry(uintptr_t arg) |
| { |
| (void)arg; |
| run_loop(); |
| } |
| |
| /** |
| * This test tries to run the same secondary vCPU from two different physical |
| * CPUs concurrently. The vCPU checks that the state is ok while it bounces |
| * between the physical CPUs. |
| */ |
| TEST(vcpu_state, concurrent_save_restore) |
| { |
| alignas(4096) static char stack[4096]; |
| |
| EXPECT_EQ(hf_vm_configure(send_page_addr, recv_page_addr), 0); |
| |
| /* Start second vCPU. */ |
| EXPECT_EQ(cpu_start(1, stack, sizeof(stack), vm_cpu_entry, 0), true); |
| |
| /* Run on a loop until the secondary VM is done. */ |
| EXPECT_EQ(run_loop(), true); |
| } |