| // SPDX-License-Identifier: GPL-2.0-only |
| #include "test_util.h" |
| #include "kvm_util.h" |
| #include "processor.h" |
| #include "vmx.h" |
| |
| #include <string.h> |
| #include <sys/ioctl.h> |
| |
| #include "kselftest.h" |
| |
| #define ARBITRARY_IO_PORT 0x2000 |
| |
| static struct kvm_vm *vm; |
| |
| static void l2_guest_code(void) |
| { |
| /* |
| * Generate an exit to L0 userspace, i.e. main(), via I/O to an |
| * arbitrary port. |
| */ |
| asm volatile("inb %%dx, %%al" |
| : : [port] "d" (ARBITRARY_IO_PORT) : "rax"); |
| } |
| |
| static void l1_guest_code(struct vmx_pages *vmx_pages) |
| { |
| #define L2_GUEST_STACK_SIZE 64 |
| unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE]; |
| |
| GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages)); |
| GUEST_ASSERT(load_vmcs(vmx_pages)); |
| |
| /* Prepare the VMCS for L2 execution. */ |
| prepare_vmcs(vmx_pages, l2_guest_code, |
| &l2_guest_stack[L2_GUEST_STACK_SIZE]); |
| |
| /* |
| * L2 must be run without unrestricted guest, verify that the selftests |
| * library hasn't enabled it. Because KVM selftests jump directly to |
| * 64-bit mode, unrestricted guest support isn't required. |
| */ |
| GUEST_ASSERT(!(vmreadz(CPU_BASED_VM_EXEC_CONTROL) & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) || |
| !(vmreadz(SECONDARY_VM_EXEC_CONTROL) & SECONDARY_EXEC_UNRESTRICTED_GUEST)); |
| |
| GUEST_ASSERT(!vmlaunch()); |
| |
| /* L2 should triple fault after main() stuffs invalid guest state. */ |
| GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_TRIPLE_FAULT); |
| GUEST_DONE(); |
| } |
| |
| int main(int argc, char *argv[]) |
| { |
| vm_vaddr_t vmx_pages_gva; |
| struct kvm_sregs sregs; |
| struct kvm_vcpu *vcpu; |
| struct kvm_run *run; |
| struct ucall uc; |
| |
| TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_VMX)); |
| |
| vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code); |
| |
| /* Allocate VMX pages and shared descriptors (vmx_pages). */ |
| vcpu_alloc_vmx(vm, &vmx_pages_gva); |
| vcpu_args_set(vcpu, 1, vmx_pages_gva); |
| |
| vcpu_run(vcpu); |
| |
| run = vcpu->run; |
| |
| /* |
| * The first exit to L0 userspace should be an I/O access from L2. |
| * Running L1 should launch L2 without triggering an exit to userspace. |
| */ |
| TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, |
| "Expected KVM_EXIT_IO, got: %u (%s)\n", |
| run->exit_reason, exit_reason_str(run->exit_reason)); |
| |
| TEST_ASSERT(run->io.port == ARBITRARY_IO_PORT, |
| "Expected IN from port %d from L2, got port %d", |
| ARBITRARY_IO_PORT, run->io.port); |
| |
| /* |
| * Stuff invalid guest state for L2 by making TR unusuable. The next |
| * KVM_RUN should induce a TRIPLE_FAULT in L2 as KVM doesn't support |
| * emulating invalid guest state for L2. |
| */ |
| memset(&sregs, 0, sizeof(sregs)); |
| vcpu_sregs_get(vcpu, &sregs); |
| sregs.tr.unusable = 1; |
| vcpu_sregs_set(vcpu, &sregs); |
| |
| vcpu_run(vcpu); |
| |
| switch (get_ucall(vcpu, &uc)) { |
| case UCALL_DONE: |
| break; |
| case UCALL_ABORT: |
| REPORT_GUEST_ASSERT(uc); |
| default: |
| TEST_FAIL("Unexpected ucall: %lu", uc.cmd); |
| } |
| } |